public class DataSource
extends java.lang.Object
This class is not meant to be created and used, it is actually documentation of settings
allowed in a DataSource descriptor (.ds.xml file), for use with Smart GWT Pro Edition and
above.
See com.smartgwt.client.docs.serverds
for how to use this documentation.
Each DataSource consists of a list of fields
that make up a DataSource
record
, along with field types
, validation
rules
, relationships
to
other DataSources, and other metadata.
The abstract object description provided by a DataSource is easily mapped to a variety of backend object models and storage schemes. The following table shows analogous terminology across systems.
Isomorphic Smart GWT | Relational Database | Enterprise Java Beans (EJB) | Entity/Relationship Modeling | OO/UML | XML Schema/WSDL | LDAP |
DataSource | Table | EJB class | Entity | Class | Element Schema (ComplexType) | Objectclass |
Record | Row | EJB instance | Entity instance | Class instance/Object | Element instance (ComplexType) | Entry |
Field | Column | Property | Attribute | Property/Attribute | Attribute or Element (SimpleType) | Attribute |
DataSources can be declared
in either JavaScript or XML format, and can also be imported
from existing metadata formats, including XML Schema.
Data Binding is the process by
which Data Binding-capable UI components
can automatically configure themselves for viewing, editing and saving data described by
DataSources. DataBinding is covered in the 'QuickStart Guide', Chapter 6, Data Binding.
Data Integration
is the process by
which a DataSource can be connected to server systems such as SQL DataBases, Java Object
models, WSDL web services and other data providers. Data Integration comes in two variants:
client-side and server-side. Server-side
integration
uses the Smart GWT Java-based server to connect to data represented by Java
Objects or JDBC-accessible databases. Client-side integration
connects Smart GWT DataSources to XML, JSON or other formats
accessible via HTTP.
DataSources have a concept of 4 core operations
("fetch", "add", "update" and
"remove") that can be performed on the set of objects represented by a DataSource. Once a
DataSource has been integrated with your data store, databinding-capable UI components can
leverage the 4 core DataSource operations to provide many complete user interactions without
the need to configure how each individual component loads and saves data.
These
interactions include grid views
, tree views
, detail views
, form
-based editing
and saving
, grid-based editing
and saving
, and custom interactions
provided by Pattern Reuse Example custom databinding-capable components.
Modifier and Type | Field and Description |
---|---|
DataSourceField[] |
addedAuditFields
The list of extra manually managed fields that will be added to the
fields of the
Audit DataSource . |
java.lang.Boolean |
allowAdvancedCriteria
By default, all DataSources are assumed to be capable of handling
AdvancedCriteria on fetch or filter type operations. |
java.lang.Boolean |
allowClientRequestedSummaries
If a
DSRequest arrives from the client that requests server-calculated summaries , should it be allowed? |
boolean |
audit
Enables saving of a log of changes to this DataSource in a second DataSource with the same
fields, called the "audit DataSource".
|
java.lang.Integer |
auditChangedFieldsFieldLength
For DataSources with
auditing
enabled , specifies the length of the field used
to store the names of the fields which were updated. |
java.lang.String |
auditChangedFieldsFieldName
For DataSources with
auditing
enabled , specifies the field name used to store the names of the fields which were updated. |
java.lang.String |
auditDataSourceID
For DataSources with
auditing
enabled , optionally specifies the ID of the audit DataSource. |
java.lang.String |
auditDSConstructor
For DataSources with
auditing
enabled , optionally specifies the serverConstructor for the
automatically generated audit DataSource. |
java.lang.String |
auditedDataSourceID
For audit DataSources, this required property specifies the ID of the
audited DataSource. |
java.lang.String |
auditRevisionFieldName
For DataSources with
auditing
enabled , specifies the field name used to store the revision number for the change (in a field
of type "sequence"). |
java.lang.String |
auditTimeStampFieldName
For DataSources with
auditing
enabled , specifies the field name used to store the timestamp when the operation was performed
(in a field of type "datetime"). |
java.lang.String |
auditTypeFieldName
For DataSources with
auditing
enabled , specifies the field name used to store the operationType (in a field of type "text"). |
java.lang.String |
auditUserFieldName
For DataSources with
auditing
enabled , specifies the field name used to store the user who performed the operation. |
java.lang.Boolean |
autoConvertRelativeDates
Whether to convert relative date values to concrete date values before sending to the server.
|
boolean |
autoCreateAuditTable
Setting
autoCreateAuditTable to true indicates that audit DataSource
will automatically create SQL table when auditing is enabled. |
java.lang.Boolean |
autoDeriveSchema
This property allows you to specify that your DataSource's schema (field definitions) should
be automatically derived from some kind of metadata.
|
boolean |
autoDeriveTitles
If set, titles are automatically derived from
field.name for any field that does not
have a field.title and is not
marked hidden :true, by calling
the method getAutoTitle() . |
java.lang.String |
beanClassName
This property has different meanings depending on the
serverType : |
java.lang.String |
callbackParam
Applies only to dataFormat: "json" and
dataTransport :"scriptInclude". |
boolean |
canMultiSort
When true, indicates that this DataSource supports multi-level sorting.
|
java.lang.String |
childrenField
fieldName for a field in the dataSource expected to contain an explicit array of child nodes.
|
java.lang.Boolean |
clientOnly
A clientOnly DataSource simulates the behavior of a remote data store by manipulating a static
dataset in memory as
DSRequests are executed on it. |
boolean |
compareMetadataForAuditChangeStatus
Only applicable to
binary fields on audited DataSources. |
java.lang.String |
configBean
For DataSources of
serverType
"hibernate", the name of a Spring bean to query to obtain Hibernate Configuration for this
particular DataSource. |
java.lang.Boolean |
creatorOverrides
Indicates that declarative security rules are waived for rows that were created by the current
user.
|
CriteriaPolicy |
criteriaPolicy
Decides under what conditions the
ResultSet cache should be
dropped when the ResultSet.criteria
changes. |
java.lang.String |
dataField
Name of the field that has the most pertinent numeric, date, or enum value, for use when a
DataBoundComponent needs to show a short summary of a
record. |
DSDataFormat |
dataFormat
Indicates the format to be used for HTTP requests and responses when fulfilling DSRequests (eg,
when
fetchData() is called). |
RPCTransport |
dataTransport
Transport to use for all operations on this DataSource.
|
java.lang.String |
dataURL
Default URL to contact to fulfill all DSRequests.
|
java.lang.String |
dbName
For DataSources using the
Smart GWT SQL engine
for persistence, which database configuration to use. |
java.lang.String |
defaultBooleanStorageStrategy
For
serverType:"sql"
DataSources, sets the default sqlStorageStrategy to use for
boolean fields where no sqlStorageStrategy has been declared on the field. |
MultiUpdatePolicy |
defaultMultiUpdatePolicy
Controls when primary keys are required for "update" and "remove" server operations, when
allowMultiUpdate has not been explicitly configured on either the
operationBinding.allowMultiUpdate or via the server-side API
DSRequest.setAllowMultiUpdate() . |
java.lang.String |
defaultSortField
For DataSources of
serverType
"sql" only, the name of a field to
include in the ORDER BY clause as a means of enforcing a stable sort
order, for paged fetches only. |
TextMatchStyle |
defaultTextMatchStyle
The default textMatchStyle to use for
DSRequest s that do not
explicitly state a textMatchStyle . |
java.lang.String |
description
An optional description of the DataSource's content.
|
java.lang.String |
descriptionField
Name of the field that has a long description of the record, or has the primary text data value
for a record that represents an email message, SMS, log or similar.
|
java.lang.Boolean |
dropExtraFields
Indicates that for server responses, for any data being interpreted as DataSource records,
only data that corresponds to declared fields should be retained; any extra fields should be
discarded.
|
int |
endGap
If we are
loading
progressively , indicates the number of extra records Smart GWT Server will advertise as being
available, if it detects that there are more records to view (see lookAhead ). |
java.lang.String |
enumConstantProperty
The name of the property this DataSource uses for constant name when translating Java
enumerated types to and from Javascript, if the
EnumTranslateStrategy is set to "bean". |
java.lang.String |
enumOrdinalProperty
The name of the property this DataSource uses for ordinal number when translating Java
enumerated types to and from Javascript, if the
EnumTranslateStrategy is set to "bean". |
EnumTranslateStrategy |
enumTranslateStrategy
Sets the strategy this DataSource uses to translate Java enumerated types (objects of type
enum) to and from Javascript.
|
DataSourceField[] |
fields
The list of fields that compose records from this DataSource.
|
java.lang.String |
fileContentsField
The native field name used by this DataSource on the server to represent the
fileContents for FileSource
Operations . |
java.lang.String |
fileFormatField
The native field name used by this DataSource on the server to represent the
fileFormat for FileSource Operations . |
java.lang.String |
fileLastModifiedField
The native field name used by this DataSource on the server to represent
fileLastModified for FileSource
Operations . |
java.lang.String |
fileNameField
The native field name used by this DataSource on the server to represent the
fileName for FileSource Operations
operations. |
java.lang.String |
fileTypeField
The native field name used by this DataSource on the server to represent the
fileType for FileSource Operations . |
java.lang.String |
fileVersionField
The native field name used by this DataSource on the server to represent
fileVersion for FileSource Operations . |
java.lang.String |
forceSort
For DataSources of
serverType
"sql" only, indicates whether we should automatically add a sort field for paged fetches on this DataSource. |
boolean |
generateAuditDS
For an
audited DataSource, controls
whether the Framework will attempt to auto-generate the audit DataSource. |
java.util.Map |
globalNamespaces
Namespaces definitions to add to the root element of outbound XML messages sent to a web
service, as a mapping from namespace prefix to namespace URI.
|
java.lang.String |
guestUserId
Value to use for the
ownerIdField if no one has authenticated. |
java.lang.String |
iconField
|
java.lang.String |
ID
Unique identifier for this DataSource.
|
java.lang.String |
idClassName
For JPA and Hibernate DataSources this property indicates, that data source has composite
primary key and specifies fully-qualified Java class: with
@EmbeddedId you have to specify class name of declared id with
@IdClass you have to specify class specified in annotation
declaration |
java.lang.Boolean |
ignoreTextMatchStyleCaseSensitive
For fields on this dataSource that specify
ignoreTextMatchStyle
true, the prevailing textMatchStyle is ignored and Smart GWT matches exact values. |
Criteria |
implicitCriteria
Criteria that are implicitly applied to all fetches made through this DataSource.
|
java.lang.String |
infoField
Name of the field that has the second most pertinent piece of textual information in the
record, for use when a
DataBoundComponent needs to show a
short summary of a record. |
DSInheritanceMode |
inheritanceMode
For dataSources of
serverType
"sql" and "hibernate", specifies the inheritance mode to use. |
java.lang.String |
inheritsFrom
ID of another DataSource this DataSource inherits its
fields from. |
java.lang.String |
jsonPrefix
Allows you to specify an arbitrary prefix string to apply to all json format responses sent
from the server to this application.
|
java.lang.String |
jsonSuffix
Allows you to specify an arbitrary suffix string to apply to all json format responses sent
from the server to this application.
|
java.lang.Integer |
logSlowAdd
Allows you to specify
"add" operation SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. |
java.lang.Integer |
logSlowCustom
Allows you to specify
"custom" operation SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. |
java.lang.Integer |
logSlowFetch
Allows you to specify
"fetch" operation SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. |
java.lang.Integer |
logSlowRemove
Allows you to specify
"remove" operation SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. |
java.lang.Integer |
logSlowSQL
Allows you to specify SQL query execution time threshold in milliseconds, which if exceeded
query is identified as "slow" and may be logged under specific logging category.
|
java.lang.Integer |
logSlowUpdate
Allows you to specify
"update" operation SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. |
int |
lookAhead
If we are
loading
progressively , indicates the number of extra records Smart GWT Server will read beyond the
end record requested by the client, in order to establish if there are more records to view. |
java.lang.Integer |
maxFileVersions
If
automatic file
versioning is enabled for a FileSource DataSource, this property configures the maximum number
of versions to retain. |
Criteria |
mockDataCriteria
When
mockMode is enabled, criteria to
use in an initial "fetch" DSRequest to retrieve sample data. |
java.lang.Integer |
mockDataRows
When
mockMode is enabled, number of
rows of data to retrieve via an initial "fetch" DSRequest, for use as sample data. |
boolean |
noNullUpdates
When true, indicates that fields in this DataSource will never be positively updated to the
null value; they may arrive at null values by being omitted, but we will not send actual null
values in update requests.
|
boolean |
nullBooleanValue
If
noNullUpdates is set, the
value to use for any boolean field that has a null value assigned on an update operation, and
does not specify an explicit nullReplacementValue . |
Date |
nullDateValue
If
noNullUpdates is set, the
value to use for any date or time field that has a null value assigned on an update operation,
and does not specify an explicit nullReplacementValue . |
float |
nullFloatValue
If
noNullUpdates is set, the
value to use for any float field that has a null value assigned on an update operation, and
does not specify an explicit nullReplacementValue . |
int |
nullIntegerValue
If
noNullUpdates is set, the
value to use for any integer field that has a null value assigned on an update operation, and
does not specify an explicit nullReplacementValue . |
java.lang.String |
nullStringValue
If
noNullUpdates is set, the
value to use for any text field that has a null value assigned on an update operation, and does
not specify an explicit nullReplacementValue . |
boolean |
omitNullDefaultsOnAdd
When true, and
noNullUpdates
is also true, indicates that "add" requests on this DataSource will have null-valued fields
removed from the request entirely before it is sent to the server, as opposed to the default
behavior of replacing such null values with defaults. |
OperationBinding[] |
operationBindings
Optional array of OperationBindings, which provide instructions to the DataSource about how
each
DSOperation is to be performed.
|
java.lang.String |
ownerIdField
Requires that the currently authenticated user match the contents of
this field, for client-initiated requests (i.e., where
DSRequest.isClientRequest() returns true on the server). |
NullAccessType |
ownerIdNullAccess
If
ownerIdField is in force,
specifies the access that is allowed to records with a null ownerIdField . |
java.lang.String |
ownerIdNullRole
If
ownerIdField is in force,
specifies a role that will allow the ownerIdField to take a null value. |
java.lang.String |
pluralTitle
User-visible plural name for this DataSource.
|
java.lang.Boolean |
preventHTTPCaching
If set, the DataSource will ensure that it never uses a cached HTTP response, even if the
server marks the response as cacheable.
|
java.lang.Boolean |
progressiveLoading
If true, causes Smart GWT Server to use the "progressive loading" pattern for fetches on this
dataSource, as described in the Paging and total dataset length section of the
ResultSet documentation . |
int |
progressiveLoadingThreshold
Indicates the dataset size that will cause Smart GWT Server to automatically switch into
progressive loading mode for
this DataSource. |
java.lang.String |
projectFileKey
For DataSources with type
, looks up the locations to use as projectFileLocations from
the project's configuration (i.e. |
java.lang.String[] |
projectFileLocations
For DataSources with type
,
specifies locations for the project files. |
java.lang.Boolean |
qualifyColumnNames
For dataSources of
serverType
"sql", determines whether we qualify column names with table names in any SQL we generate. |
java.lang.Boolean |
quoteColumnNames
If set, tells the SQL engine to quote column names in all generated DML and DDL statements for
this dataSource.
|
java.lang.Boolean |
quoteTableName
For SQL DataSources, tells the framework whether to surround the associated
table name with quotation marks
whenever it appears in generated queries. |
java.lang.String |
recordName
Provides a default value for
OperationBinding.recordName . |
XPathExpression |
recordXPath
|
java.lang.String |
relatedTableAlias
For a
SQL DataSource that is referred by additional foreign keys , this
property defines the table alias name to use in generated SQL. |
DSRequest |
requestProperties
Additional properties to pass through to the
DSRequest s made
by this DataSource. |
VelocityExpression |
requires
Indicates that the specified
VelocityExpression must evaluate
to true for a user to access this DataSource. |
java.lang.Boolean |
requiresAuthentication
Whether a user must be authenticated in order to access this DataSource.
|
java.lang.String |
requiresRole
Similar to
OperationBinding.requiresRole , but controls access to the DataSource as a whole. |
int |
resultBatchSize
Very advanced: for servers that do not support paging, and must return large numbers of XML
records in one HTTP response, Smart GWT breaks up the processing of the response in order to
avoid the "script running slowly" dialog appearing for an end user.
|
java.util.Map |
resultSetClass
Class for ResultSets used by this datasource.
|
java.util.Map |
resultTreeClass
Class for ResultTrees used by this datasource.
|
java.lang.String |
schema
This property only applies to the built-in SQL DataSource provided in Pro and better
editions of Smart GWT
|
java.lang.String |
schemaBean
For DataSources that specify
autoDeriveSchema , this property
indicates the name of the Spring bean, Hibernate mapping or fully-qualified Java class to use
as parent schema. |
java.lang.String |
schemaNamespace
For a DataSource derived from WSDL or XML schema, the XML namespace this schema belongs to.
|
java.lang.String |
script
Default scriptlet to be executed on the server for each operation.
|
java.lang.Boolean |
sendExtraFields
Analogous to
dropExtraFields , for data sent to the server. |
SequenceMode |
sequenceMode
For fields of
type "sequence" in
a dataSource of
serverType "sql", indicates the
SequenceMode to use. |
java.lang.String |
serverConstructor
This property allows you to write and use custom DataSource subclasses on the server, by
specifying either the fully-qualified name of the DataSource subclass that should be
instantiated server-side for this dataSource, or the token "spring:" followed by a
valid Spring bean ID, if you wish to instantiate your custom dataSource object using Spring
dependency injection.
|
ServerObject |
serverObject
For Direct Method Invocation (DMI) binding, declares the ServerObject to use as the default
target for all
operationBindings . |
java.lang.String |
serverOnly
Setting a DataSource to be
serverOnly="true" ensures that it will not be visible
to the client. |
DSServerType |
serverType
For a DataSource stored in .xml format on the Smart GWT server, indicates what server-side
connector to use to execute requests, that is, what happens if you call dsRequest.execute() in
server code.
|
java.lang.String |
serviceNamespace
For an XML DataSource, URN of the WebService to use to invoke operations.
|
java.lang.Boolean |
showLocalFieldsOnly
For a DataSource that inherits
fields from another DataSource (via inheritsFrom ), indicates that only
the fields listed in this DataSource should be shown. |
java.lang.Boolean |
showPrompt
Whether RPCRequests sent by this DataSource should enable
RPCRequest.showPrompt in order to block user
interactions until the request completes. |
boolean |
sparseUpdates
When true, indicates that any updates for this DataSource include only those fields that have
actually changed (and primaryKey fields); when false (the default), all field values are
included in updates, whether they have changed or not
|
SQLPagingStrategy |
sqlPaging
The paging strategy to use for this DataSource.
|
java.lang.Boolean |
sqlUsePagingHint
If explicitly set true or left null, causes the server to use a "hint" in the SQL we generate
for paged queries.
|
java.lang.Boolean |
strictSQLFiltering
If set to true, both client and server-side advanced filtering used by Smart GWT will follow
SQL99 behavior for dealing with NULL values, which is often counter-intuitive to users.
|
java.lang.String |
tableCode
Only applicable to the built-in SQL DataSource
|
java.lang.String |
tableName
For DataSources using the
Smart GWT SQL engine
for persistence, what database table name to use. |
java.lang.String |
tagName
Tag name to use when serializing to XML.
|
java.lang.String |
title
User-visible name for this DataSource.
|
java.lang.String |
titleField
Best field to use for a user-visible title for an individual record from this dataSource.
|
java.lang.Boolean |
transformMultipleFields
If set to "false", transformation of values for
multiple:true fields, normally
controlled by DataSourceField.multipleStorage , is instead disabled for this entire DataSource. |
java.lang.String |
transformRawResponseScript
Applicable to
server-side
REST DataSources only |
java.lang.Boolean |
trimMilliseconds
For this dataSource, should the millisecond portion of time and datetime values be trimmed off
before before being sent from client to server or vice versa.
|
java.lang.Boolean |
useAnsiJoins
For DataSources using the
Smart GWT SQL engine
for persistence, whether to use ANSI-style joins (ie, joins implemented with JOIN directives in
the table clause, as opposed to additional join expressions in the where clause). |
java.lang.Boolean |
useFlatFields
Like
DataBoundComponent.useFlatFields , but applies to all DataBound components that bind to this
DataSource. |
java.lang.Boolean |
useLocalValidators
Whether to attempt validation on the client at all for this DataSource.
|
java.lang.Boolean |
useOfflineStorage
Whether we store server responses for this DataSource into
browser-based offline storage , and then use those stored
responses at a later time if we are offline (ie, the application cannot connect to the server). |
java.lang.Boolean |
useParentFieldOrder
For a DataSource that inherits
fields from another DataSource (via inheritsFrom ), indicates that the
parent's field order should be used instead of the order of the fields as declared in this
DataSource. |
java.lang.Boolean |
useSequences
For a DataSource with
serverType:"sql" , this flag indicates whether any fields of type "sequence" should be backed by a
native database sequence (if the flag is true) or an auto-increment/identity column (if it is
false). |
java.lang.Boolean |
useSubselectForRowCount
This property is only applicable to
SQL DataSources, and only for operations that express a customSQL clause. |
java.util.Map |
xmlNamespaces
Sets the XML namespace prefixes available for XPaths on a DataSource-wide basied.
|
Constructor and Description |
---|
DataSource() |
public java.lang.Boolean sqlUsePagingHint
OperationBinding.sqlUsePagingHint
. Note this property is only applicable to SQL
DataSources, only when a paging strategy
of "sqlLimit" is in
force, and it only has an effect for those specific database products where we employ a native
hint in the generated SQL in an attempt to improve performance.
Default value is null
OperationBinding.sqlUsePagingHint
public int resultBatchSize
If you have a
relatively small number of records with a great deal of properties or subobjects on each
record, and you have not set dropExtraFields
to eliminate
unused data, and you see the "script running slowly" dialog, you may need to set this number
lower.
Default value is 150
public java.lang.String beanClassName
serverType
: For SQL DataSources
(DataSources with serverType "sql")
If set, results from the database will be used to
create one instance of the indicated Java bean per database row. Otherwise a Map is used to
represent each row retrieved from SQL.
With this feature active, a DSResponse from this
DataSource will contain a Collection of instances of the indicated beanClassName
,
available via DSResponse.getData(). This creates a couple of possibilities:
DMI
method that calls DSRequest.execute()
to retrieve a DSResponse, you have an opportunity to call business logic methods on the beans
representing each row affected by the DSRequest. For example, notify a related BPEL process of
changes to certain fields. By using beanClassName
on a specific
OperationBinding
, you can:
Note that beanClassName
affects what numeric field types will be used for
inbound DSRequest data. For fields with numeric types, the record data
in DSRequests will automatically be
converted to the type of the target field, before the request is received in a DMI. For
details, see DsRequestBeanTypes
.
Note that DMI
also has a built-in facility for populating a bean
with the inbound DSRequest.data
- just
declare the bean as a method argument.
For generic DataSources (DataSources with
serverType "generic")
Reify
sets this property
when it creates a generic DataSource using the Javabean Wizard. It has no built-in
server-side effects.
For Hibernate DataSources (DataSources with serverType
"hibernate")
The name of the Java bean or POJO class that is mapped in Hibernate. This
will typically be the fully-qualified class name - eg com.foo.MyClass
- but it
may be the simple class name - just MyClass
- or it may be some other value. It
all depends on how your classes have been mapped in Hibernate.
The declared Java bean will
affect how its properties will be mapped to built-in numeric types, see Hibernate Integration overview
for details.
Note: If you are intending to use Hibernate as a data-access layer only, you do not need to create Hibernate mappings or Java objects: Smart GWT will generate everything it needs on the fly.
For JPA DataSources (DataSources with serverType "jpa" or "jpa1")
The fully
qualified class name of the JPA annotated entity.
NOTE for Hibernate and JPA users: When you use JPA, or use Hibernate as a full ORM system (ie, not just allowing Smart GWT Server to drive Hibernate as a data access layer), the beans returned on the server-side are live. This means that if you make any changes to them, the ORM system will persist those changes. This is true even if the beans were created as part of a fetch operation.
This causes a problem in the common case where you want to use a DMI or custom DataSource implementation to apply some post-processing to the beans fetched from the persistent store. If you change the values in the beans directly, those changes will be persisted.
If you
want to alter the data returned from a JPA or Hibernate persistent store as part of a fetch
request just so you can alter what gets sent to the client, you can use the server-side
DSResponse
's getRecords()
method. This will return your bean data in
"record" format - ie, as a List of Maps. You can alter these records without affecting your
persistent store, and then call setData()
on the DSResponse
),
passing the altered list of records. See the server-side Javadocs for DSResponse
for details of these two methods.
Default value is null
OperationBinding.beanClassName
public java.lang.String auditDataSourceID
auditing
enabled
, optionally specifies the ID of the audit DataSource. If this property is not
specified, the ID of the audit DataSource will be audit_[OriginalDSID]
Default value is null
public java.lang.String serverConstructor
"spring:MyDataSourceBean"
. See also ServerInit
for special concerns with framework initialization when
using Spring. It is also particularly important that you read the discussion of caching and
thread-safety linked to below, as there are special considerations in this area when using
Spring."cdi:MyDataSourceBean"
.One reason you might wish to do this would be to override the validate() method to provide some arbitrary custom validation (such as complex database lookups, validation embedded in legacy applications, etc). It is also possible - though obviously a more substantial task - to override the execute() method in your custom DataSource. This is one way of creating a completely customized DataSource implementation.
Note: If you use this property, you are responsible for making sure
that it refers to a valid server-side class that extends
com.isomorphic.datasource.BasicDataSource
, or to a Spring bean of the same
description. If your implementation relies on methods or state only present in certain
specialized subclasses of DataSource (for example, you want the normal behavior and features
of a HibernateDataSource, but with a specialized validate() method), then you should extend
the subclass rather than the base class.
NOTE: Please take note of the points made in
this discussion
of caching and
thread-safety issues in server-side DataSources.
Default value is null
public DSDataFormat dataFormat
fetchData()
is called).
Default value is "iscServer"
public java.lang.String jsonSuffix
The inclusion of such a suffix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.
Only applies to responses formatted as json objects. Does not apply to responses returned via scriptInclude type transport.
Default value is null
public SequenceMode sequenceMode
type
"sequence" in
a dataSource of
serverType
"sql", indicates the
SequenceMode
to use. This property has no effect for fields
or dataSources of
other types.
You can set a default sequenceMode for all DataSources of a given database type by setting
property "sql.{database_type}.default.sequence.mode" in server.properties
.
You set a global default sequenceMode that applies to all database types by setting property
"sql.default.sequence.mode". For example:
sql.mysql.default.sequence.mode: jdbcDriver
Default value is "native"
public SQLPagingStrategy sqlPaging
server.properties
setting sql.defaultPaging
, is used. This setting can be
overridden with the OperationBinding.sqlPaging
property.
NOTE: Operations that involve a customSQL
clause ignore this property,
because customSQL operations usually need to be treated as special cases. For these
operations, the paging strategy comes from the server.properties
setting
sql.defaultCustomSQLPaging
or sql.defaultCustomSQLProgressivePaging
,
depending on whether or not progressiveLoading
is in
force. Note that these can always be overridden by a sqlPaging
setting on the
OperationBinding.
Default value is null
OperationBinding.sqlPaging
public java.lang.String script
OperationBinding.script
is
specified, it will be executed for the operation binding in question instead of running this
scriptlet.
Scriptlets are used similarly to DMIs configured via serverObject
or
OperationBinding.serverObject
-
they can add business logic by modifying the DSRequest before it's executed, modifying the
default DSResponse, or taking other, unrelated actions.
For example:
<DataSource> <script language="groovy"> ... Groovy code ... </script> ... other DataSource properties </DataSource>
Scriptlets can be written in any language supported by the "JSR 223" standard, including Java
itself. See the DMI Script Overview
for rules on
how to return data,
add additional imports, and other settings.
The following variables are available for DMI scriptlets:
automatic
transactions
are enabled, this
SQLConnection is in the context of the current transaction.
Scriptlets also have access to a set of contextual variables related to the Servlets API, as follows:
HttpSession
prevents your DataSource from being used in a command-line process.
Note that if a dataSource configuration has both a <script>
block and
a specified serverObject
for some operation, the
script block will be executed, and the serverObject ignored.
Default value is null
public java.lang.String fileNameField
fileName
for FileSource Operations
operations. Any extensions to the fileName to indicate type or format (e.g. ".ds.xml") are
stored in the fileTypeField
and fileFormatField
, if
specified for this DataSource. If not specified for a DataSource, the fileNameField will be inferred on the server as follows:
Default value is null
FileSource overview and related methods
public java.lang.String auditUserFieldName
auditing
enabled
, specifies the field name used to store the user who performed the operation. If
empty string is specified as the field name, the audit DataSource will not store this field.
Default value is "audit_modifier"
public OperationBinding[] operationBindings
When using the Smart GWT Server, OperationBindings are specified in your DataSource
descriptor (.ds.xml file) and control server-side behavior such as what Java object to route
DSRequest to (OperationBinding.serverObject
) or customizations to SQL, JQL and HQL queries
(OperationBinding.customSQL
,
OperationBinding.customJQL
and
OperationBinding.customHQL
).
See the @see Java Integration samples.
For DataSources bound to WSDL-described web services using
serviceNamespace
,
OperationBindings are used to bind each DataSource
operationType
to an
operation
of a WSDL-described
web service
, so that a DataSource can both fetch
and save data to a web
service.
For example, this code accomplishes part of the binding to the SalesForce partner web services
DataSource dataSource = new DataSource(); dataSource.setServiceNamespace("urn:partner.soap.sforce.com"); OperationBinding fetch = new OperationBinding(); fetch.setOperationType(DSOperationType.FETCH); fetch.setWsOperation("query"); fetch.setRecordName("sObject"); OperationBinding add = new OperationBinding(); add.setOperationType(DSOperationType.ADD); add.setWsOperation("create"); add.setRecordName("SaveResult"); OperationBinding update = new OperationBinding(); update.setOperationType(DSOperationType.UPDATE); update.setWsOperation("update"); update.setRecordName("SaveResult"); OperationBinding remove = new OperationBinding(); remove.setOperationType(DSOperationType.REMOVE); remove.setWsOperation("delete"); remove.setRecordName("DeleteResult"); dataSource.setOperationBindings(fetch, add, update, remove);NOTE: additional code is required to handle authentication and other details, see the complete code in smartclientSDK/examples/databinding/SalesForce.
For DataSources that contact non-WSDL-described XML or JSON services, OperationBindings can
be used to separately configure the URL, HTTP method, input and output processing for each
operationType. This makes it possible to fetch JSON data from one URL for the "fetch"
operationType and save to a web service for the "update" operationType, while appearing as a
single integrated DataSource to a DataBoundComponent
such
as an
editable ListGrid
.
If no operationBinding is defined for a given DataSource operation, all of the properties which are valid on the operationBinding are checked for on the DataSource itself.
This also means that for a read-only DataSource, that is, a DataSource only capable of fetch operations, operationBindings need not be specified, and instead all operationBinding properties can be set on the DataSource itself. In the RSS Feed sample, you can see an example of using OperationBinding properties directly on the DataSource in order to read an RSS feed.
Default value is null
OperationBinding
public java.lang.Integer logSlowRemove
"remove" operation
SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. See logSlowSQL
for more details.
Default value is null
public java.lang.String fileTypeField
fileType
for FileSource Operations
.
If the fileTypeField is not configured, then a field named "fileType" will be used, if it exists. Otherwise, the DataSource will not track fileTypes -- this may be acceptable if, for instance, you use a separate DataSource for each fileType.
The fileType is specified according to the extension that would have been used in the filesystem -- for instance, the fileType for employees.ds.xml would be "ds".
Default value is null
FileSource overview and related methods
public java.lang.Boolean useFlatFields
DataBoundComponent.useFlatFields
, but applies to all DataBound components that bind to this
DataSource.
Default value is null
public java.lang.String infoField
DataBoundComponent
needs to show a
short summary of a record. For example, for a DataSource of employees, a "job title" field would probably be the second most pertinent text field aside from the employee's "full name".
Unlike titleField
,
infoField is not automatically determined in the absence of an explicit setting.
Default value is null
public java.util.Map xmlNamespaces
OperationBinding.xmlNamespaces
for details.
Default value is See below
public VelocityExpression requires
VelocityExpression
must evaluate
to true for a user to access this DataSource. See also OperationBinding.requires
.
Default value is null
public java.lang.String ID
Default value is null
public java.lang.Integer maxFileVersions
automatic file
versioning
is enabled for a FileSource DataSource, this property configures the maximum number
of versions to retain.
Default value is 20
public java.lang.String tagName
dataSource.ID
will
be used.
Default value is null
public boolean generateAuditDS
audited
DataSource, controls
whether the Framework will attempt to auto-generate the audit DataSource. Note that this
property is independent of auditDataSourceID
so that, by
default, even when the audit DataSource is given a non-default ID, the Framework will still
attempt to auto-generate it.
Default value is true
public java.lang.Boolean allowClientRequestedSummaries
DSRequest
arrives from the client that requests server-calculated summaries
, should it be allowed?
Note this setting only affects dsRequests
that come from the browser
(or another client). This setting has no effect on server summaries declared in .ds.xml files
or summaries configured in DSRequests created programmatically on the server side, which are
always allowed.
Default value of null means this DataSource will use the system-wide
default, which is set via datasources.allowClientRequestedSummaries
in server.properties
, and defaults to allowing
client-requested summaries.
If client-requested summarization is allowed, but the server-side <operationBinding> provides specific summarization settings, the client-requested summarization is ignored.
Default value is null
public java.lang.Boolean useLocalValidators
Disabling client-side validation entirely is a good way to test server-side validation.
Default value is null
Validation overview and related methods
public EnumTranslateStrategy enumTranslateStrategy
Default value is null
public java.lang.Boolean clientOnly
DSRequests
are executed on it.
Any changes are lost when the user reloads the page or navigates away. A clientOnly DataSource will return responses asynchronously, just as a DataSource accessing remote data does. This allows a clientOnly DataSource to be used as a temporary placeholder while a real DataSource is being implemented - if a clientOnly DataSource is replaced by a DataSource that accesses a remote data store, UI code for components that used the clientOnly DataSource will not need be changed.
A clientOnly DataSource can also be used as a shared cache of
modifiable data across multiple UI components when immediate saving is not desirable. In this
case, several components may interact with a clientOnly DataSource and get the benefit of
ResultSet
behaviors such as automatic cache sync and
in-browser data filtering and sorting. When it's finally time to save, cacheData
can be inspected for changes and
data can be saved to the original DataSource via addData()
, updateData()
and removeData()
, possibly in a transactional queue
. Note that getClientOnlyDataSource()
lets you
easily obtain a clientOnly
DataSource representing a subset of the data available
from a normal DataSource.
See also cacheAllData
- a cacheAllData
behaves like a write-through cache, performing fetch and filter operations locally while still
performing remote save operations immediately.
ClientOnly DataSources can be populated
programmatically via cacheData
- see
this discussion
for other ways to
populate a client-only DataSource with data.
Default value is false
public java.lang.Boolean ignoreTextMatchStyleCaseSensitive
ignoreTextMatchStyle
true, the prevailing textMatchStyle is ignored and Smart GWT matches exact values. This
property dictates whether that match is case-sensitive like the "exactCase" textMatchStyle, or
case-insensitive like the "exact" textMatchStyle (the default). Please see the TextMatchStyle documentation
for a discussion of the
nuances of case-sensitive matching.
Default value is false
public CriteriaPolicy criteriaPolicy
ResultSet
cache should be
dropped when the ResultSet.criteria
changes.
Default value is "dropOnShortening"
public java.lang.Integer logSlowAdd
"add" operation
SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. See logSlowSQL
for more details.
Default value is null
public java.lang.String callbackParam
dataTransport
:"scriptInclude".
Specifies the name of the query parameter that tells your JSON service what function to call as
part of the response.
Default value is "callback"
public java.lang.String auditTimeStampFieldName
auditing
enabled
, specifies the field name used to store the timestamp when the operation was performed
(in a field of type "datetime"). If empty string is specified as the field name, the audit
DataSource will not store this field.
Default value is "audit_changeTime"
public Criteria mockDataCriteria
mockMode
is enabled, criteria to
use in an initial "fetch" DSRequest to retrieve sample data.
Default value is null
public int progressiveLoadingThreshold
progressive loading mode
for
this DataSource. To prevent automatic switching to progressive loading, set this property to
-1. This may also be prevented on a per-request basis by setting DSRequest.progressiveLoading
to
false
.
Default value is 200000
public java.lang.Boolean showLocalFieldsOnly
fields
from another DataSource (via inheritsFrom
), indicates that only
the fields listed in this DataSource should be shown. All other inherited parent fields will
be marked "hidden:true".
Default value is null
public java.lang.String serviceNamespace
Having
loaded a WebService using XMLTools.loadWSDL()
, setting serviceNamespace
combined with specifying operationBindings
that set OperationBinding.wsOperation
will
cause a DataSource to invoke web service operations to fulfill DataSource requests (DSRequests
).
Setting serviceNamespace
also
defaults dataURL
to the service's
location, dataFormat
to "xml"
and dataProtocol
to
"soap".
Default value is null
public java.lang.String fileVersionField
fileVersion
for FileSource Operations
.
Automatic file versioning is configured by the presence of this property: if you want
automatic versioning for a FileSource DataSource, it is sufficient to simply define a
fileVersionField
. When automatic versioning is on:
saveFile()
will save a new version of the file,
retaining previous versions up to the maximum configured by maxFileVersions
; when that
maximum is reached, the oldest version is overwrittengetFile()
API always returns the most recent
versionlistFiles()
API only
includes the most recent version of any filelistFileVersions()
and getFileVersion()
APIs. Note that retrieving a previous version of a file and then calling
saveFile()
goes through the normal process of saving a new version
The fileVersion
field is expected to be of type "datetime", and automatic
versioning will not work otherwise. Note, to minimize the possibility of version timestamp
collisions, we recommend that fileVersion
fields specify storeMilliseconds
: true.
If the fileVersionField is not configured, no automatic file versioning will be done.
Default value is null
maxFileVersions
,
DataSource.listFileVersions(com.smartgwt.client.data.FileSpec, com.smartgwt.client.data.DSCallback)
,
DataSource.getFileVersion(com.smartgwt.client.data.FileSpec, java.util.Date, com.smartgwt.client.callbacks.GetFileVersionCallback)
,
DataSource.removeFileVersion(com.smartgwt.client.data.FileSpec, java.util.Date)
,
FileSource overview and related methods
public boolean noNullUpdates
Setting this value causes null-assigned fields to be replaced with the field's nullReplacementValue
,
if one is declared. If no nullReplacementValue
is declared for the field, the null
assignment is replaced with the DataSource's nullStringValue
, nullIntegerValue
, nullFloatValue
or nullDateValue
, depending on the
field type.
For "add" operations, setting omitNullDefaultsOnAdd
causes null-valued fields to be removed from the request entirely, rather than replaced with
default values as described above.
Default value is false
public java.lang.Boolean transformMultipleFields
multiple:true
fields, normally
controlled by DataSourceField.multipleStorage
, is instead disabled for this entire DataSource.
Default value is null
public java.lang.String enumConstantProperty
EnumTranslateStrategy
is set to "bean". Defaults to "_constant" if
not set. This property is only applicable if you are using the Smart GWT server
Default value is null
public java.lang.String transformRawResponseScript
server-side
REST DataSources
only A scriptlet to be executed on the server after data has been
fetched from the REST service, but before it is processed through templating
. The intention is that
this scriptlet transforms the response data in some way, before that transformed data is passed
through templating and further downstream transformation steps such as record transformation
. If your
use case does not involve templating, there is no difference between putting your
transformation logic in this script, or putting it in a transformResponseScript
-
they are merely pre-templating and post-templating transformation opportunities, so if no
templating is involved, they are conceptually the same thing. Accordingly, exactly the same
variables are available to the transformRawResponseScript
as to the transformResponseScript
- see
that property's documentation for details.
Note, if you prefer a Java solution rather than
placing scripts in your .ds.xml
files, you can instead extend the Java
RESTDataSource
class and override its transformRawResponse()
method.
If you both override the Java method and provide a transformRawResponseScript
,
the Java method runs first and any transformations it makes will be visible to the script.
See serverConstructor
for details of how to use a custom class to implement a DataSource server-side.
Default value is null
script
,
com.smartgwt.client.data.DataSource#getTransformResponseScript
,
OperationBinding.transformRawResponseScript
,
ServerScript overview and related methods
public java.lang.String recordName
OperationBinding.recordName
.
Default value is null
public RPCTransport dataTransport
defaultTransport
. This would typically
only be set to enable "scriptInclude" transport for contacting JSON
web services hosted on servers
other than the origin server. When using the "scriptInclude" transport, be sure to set
callbackParam
or OperationBinding.callbackParam
to match the name of the query parameter name expected by your
JSON service provider.
Default value is RPCManager.defaultTransport
public java.lang.Boolean dropExtraFields
For JSON
data,
this means extra properties in selected objects are dropped.
By default, for DMI
DSResponses, DSResponse.data is filtered on the server to just the set of fields defined on the
DataSource (see the overview in DMI
).
This type of filtering can also be enabled for non-DMI DSResponses. By default it is enabled for Hibernate and JPA datasources to avoid unintentional lazy loading too much of a data model. For the rest of datasources this is disabled by default.
Explicitly setting this property to
false
disables (or to true
enables) this filtering for this
DataSource only. This setting overrides the configuration in server.properties
. This setting can be overridden
by ServerObject.dropExtraFields
.
Default value is null
public java.lang.String dbName
Smart GWT SQL engine
for persistence, which database configuration to use. Database configurations can be created
using the Admin Console
. If unset, the default
database configuration is used (which is also settable using the "Databases" tab).
Default value is null
public java.lang.Boolean quoteTableName
table name
with quotation marks
whenever it appears in generated queries. This is only required if you have to connect to a
table with a name that is in breach of your database product's naming conventions. For
example, some products (eg, Oracle) internally convert all unquoted references to upper case,
so if you create a table called myTest
, the database actually calls it
MYTEST
unless you quoted the name in the create command, like this:
CREATE TABLE "myTest"
If you do quote the name like this, or if you have to connect to a legacy table that has been named in this way, then you must set this property to tell the SQL engine that it must quote any references to this table name (this requirement depends on the database in use - as noted below, some are not affected by this problem). If you do not, you will see exceptions along the lines of "Table or view 'myTest' does not exist".
Note, other database products (eg, Postgres) convert unquoted names to lower case, which leads to the same issues. Still others (eg, SQL Server) are not case sensitive and are not affected by this issue.
Generally, we recommend that you avoid using this property unless you have a specific reason to do so. It is preferable to avoid the issue altogether by simply not quoting table names at creation time, if you are able to do so.
Default value is null
public java.lang.String fileLastModifiedField
fileLastModified
for FileSource
Operations
. If the fileLastModifiedField is not configured, then a field named "fileLastModified" will be used, if it exists. Otherwise, the server will look for a field with a "modifierTimestamp" type. If that is not found, the DataSource will not keep track of the last modified date.
Default value is null
FileSource overview and related methods
public java.lang.String descriptionField
For example, for a DataSource representing employees, a field containing the employee's "bio" might be a good choice, or for an email message, the message body.
If descriptionField is unset, it defaults to any field named "description" or "desc" in the record, or the first long text field (greater than 255 characters) in the record, or null if no such field exists.
Default value is null
public ServerObject serverObject
operationBindings
. Specifying this attribute in an XML DataSource stored on the server
enables DMI for this DataSource. Note that if a dataSource configuration has both a
<script>
block and a
specified serverObject
for some operation, the script block will be executed, and
the serverObject ignored.
Default value is null
public java.lang.Integer logSlowCustom
"custom" operation
SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. See logSlowSQL
for more details.
Default value is null
public boolean autoDeriveTitles
field.name
for any field that does not
have a field.title
and is not
marked hidden
:true, by calling
the method getAutoTitle()
.
Default value is true
public boolean sparseUpdates
Default value is false
public java.lang.Boolean strictSQLFiltering
field == "someValue" (normally false) field != "someValue" (normally true) not (field == "someValue") (normally true) not (field != "someValue") (normally false)This property can be overridden per-query by specifying
strictSQLFiltering
directly as a property on the AdvancedCriteria
.
NOTE: On the server side, this property is only applicable if you are using the SQL DataSource; the other built-in types (Hibernate and JPA/JPA2) do not offer this mode.
Default value is false
public java.lang.Boolean progressiveLoading
ResultSet documentation
. Essentially, this means that we
avoid issuing a row count query and instead advertise total rows as being slightly more than
the number of rows we have already read (see endGap
). This allows users to load more
of a dataset by scrolling past the end of the currently-loaded rows, but it prevents them from
scrolling directly to the end of the dataset. Generally, progressive loading is appropriate
when you have to deal with very large datasets. Note that by default, a dataSource will switch
into progressive loading mode automatically when it detects that it is dealing with a dataset
beyond a certain size - see progressiveLoadingThreshold
.
This setting can be overridden for individual fetch
operations with the OperationBinding.progressiveLoading
property, and also at the level of the individual DSRequest
. You can also specify
progressiveLoading
on DataBoundComponents
and
certain types of FormItem
- SelectItem
and
ComboBoxItem
.
Currently, this property only applies to users of the built-in
SQLDataSource, but you could use it in custom DataSource implementations to trigger the server
behavior described in the ResultSet
documentation linked to above.
Default value is null
public java.lang.String configBean
serverType
"hibernate", the name of a Spring bean to query to obtain Hibernate Configuration for this
particular DataSource. Note that this is intended for DataSource-specific configuration
overrides for unusual circumstances, such as a DataSource whose physical data store is a
completely different database to that used by other DataSources. See the Integration with Hibernate
article for more
information
Default value is null
public java.lang.String schemaBean
autoDeriveSchema
, this property
indicates the name of the Spring bean, Hibernate mapping or fully-qualified Java class to use
as parent schema.
Default value is null
autoDeriveSchema
public java.lang.String auditDSConstructor
auditing
enabled
, optionally specifies the serverConstructor
for the
automatically generated audit DataSource. The default is to use the same
serverConstructor
as the DataSource where audit="true"
was declared.
This property is primarily intended to allow the use of SQLDataSource (serverType:"sql"
) as an audit
DataSource for a DataSource that might be of another type. For example, you might have a
DataSource that implements all CRUD operations via Java logic in DMI declaration
methods, and so doesn't provide generic
storage; by using SQLDataSource as the type of your audit DataSource, you don't need to
implement your own scheme for storing and querying audit data, and the necessary audit tables
will be automatically generated in the database.
Similarly, even if you do use a reusable DataSource type such as the built-in JPADataSource, using SQLDataSource for audit DataSources means there's no need to write a JPA bean just to achieve storage of an audit trail.
To
simplify this intended usage, the string "sql" is allowed for auditDSConstructor
as a means of specifying that the built-in SQLDataSource class should be used. For any other
type, use the fully qualified Java classname, as is normal for serverConstructor
.
Default value is null
public java.lang.String enumOrdinalProperty
EnumTranslateStrategy
is set to "bean". Defaults to "_ordinal" if
not set. This property is only applicable if you are using the Smart GWT server
Default value is null
public java.lang.Boolean useAnsiJoins
Smart GWT SQL engine
for persistence, whether to use ANSI-style joins (ie, joins implemented with JOIN directives in
the table clause, as opposed to additional join expressions in the where clause). The default
value of null has the same meaning as setting this flag to false. Note, outer joins (see
joinType
) only work with
certain database products if you choose not to use ANSI joins. Other than that, the join
strategies are equivalent.
If you wish to switch on ANSI-style joins for every DataSource,
without the need to manually set this property on all of them, set server.properties
flag
sql.useAnsiJoins
to true.
Default value is null
com.smartgwt.client.data.OperationBinding#getIncludeAnsiJoinsInTableClause
,
ServerDataIntegration overview and related methods
public java.lang.Boolean showPrompt
RPCRequest.showPrompt
in order to block user
interactions until the request completes. DataSource requests default to blocking UI interaction because, very often, if the user continues to interact with an application that is waiting for a server response, some kind of invalid or ambiguous situation can arise.
Examples include pressing a "Save" button a second time before the first save completes, making further edits while edits are still being saved, or trying to initiate editing on a grid that hasn't loaded data.
Defaulting to blocking the UI prevents these bad interactions, or alternatively, avoids the developer having to write repetitive code to block invalid interactions on every screen.
If an operation should ever be non-blocking, methods that
initiate DataSource requests (such as fetchData()
) will generally have a requestProperties
argument allowing
showPrompt
to be set to false for a specific request.
Default value is true
public TextMatchStyle defaultTextMatchStyle
DSRequest
s that do not
explicitly state a textMatchStyle
. Note, however, that DSRequests issued by ListGrid
s and other components
will generally have a setting for
textMatchStyle on the component itself (see ListGrid.autoFetchTextMatchStyle
, for example).
Default value is "exact"
public java.lang.Integer mockDataRows
mockMode
is enabled, number of
rows of data to retrieve via an initial "fetch" DSRequest, for use as sample data. Set to null
to retrieve all available rows.
Default value is 75
public java.lang.Boolean autoConvertRelativeDates
If the server would
receive relative date values from the client, by default they would be unchanged in DMI and
automatically converted during the request execution. This may be changed via
server.properties
setting datasources.autoConvertRelativeDates
which
can be set to the following values:
postDMI
- the default value
described above preDMI
- relative date values will be converted to absolute
date values right away, so they will be already converted in DMI disabled
-
relative date values will not be automatically converted, so it must be done completely
manually or by calling the DSRequest.convertRelativeDates()
server-side API. DataSource.convertRelativeDates(Criterion)
server-side API.
Default value is true
public java.lang.String title
For example, for the supplyItem DataSource, "Supply Item".
If is unset, getAutoTitle()
method will be used with
dataSource.ID
. value in order to derive a default value for the title.
For example "employee" ID will be derived to "Employee", "team_member" ID will be derived to "Team Member".
Default value is dataSource.ID
public java.util.Map globalNamespaces
The default value is:
globalNamespaces : { xsi: "http://www.w3.org/2001/XMLSchema-instance", xsd: "http://www.w3.org/2001/XMLSchema" },This default value allows the use of the xsi:type and xsi:nil attributes without further declarations.
Note that some web services will only accept specific revisions of the XML Schema URI. If xsi-namespaced attributes seem to be ignored by an older webservice, try the URI "http://www.w3.org/1999/XMLSchema-instance" instead.
Default value is ...
public java.lang.Boolean sendExtraFields
dropExtraFields
, for data sent to the server. Setting this attribute to false ensures that
for any records in the data object, only fields that correspond to declared dataSource fields
will be present on the dsRequest data object passed to transformRequest()
and ultimately sent to
the server.
Default value is true
public Criteria implicitCriteria
For example, a DataSource might *always* implicitly limit its fetch results to records owned by the current user's department. Components and ResultSets requesting data from the DataSource can then apply further implicitCriteria of their own, separately from their regular, user-editable criteria.
For instance, a grid bound to this
dataSource might be further limited to implicitly show only the subset of records created by
the current user. See DataBoundComponent.implicitCriteria
and ResultSet.implicitCriteria
for more on
these localized options.
Note that, while implicitCriteria
can be declared in
a server DataSource file using Component XML
, it
is an entirely client-side feature, added by client-side components. So it does not affect
server-side requests, and will not be added to client-side requests that don't come from a
Smart GWT UI (eg RestHandler).
Default value is null
public java.lang.String pluralTitle
For example, for the supplyItem DataSource, "Supply Items".
Defaults to dataSource.title
+ "s".
Default value is dataSource.ID
public java.lang.String tableName
Smart GWT SQL engine
for persistence, what database table name to use. The default is to use the DataSource ID as
the table name.
Default value is null
public XPathExpression recordXPath
OperationBinding.recordXPath
. recordXPath
can be specified directly on the
DataSource for a simple read-only DataSource only capable of "fetch" operations, or on
clientOnly DataSources using $link{groupDef:testData}.
Default value is null
public java.lang.Boolean useSubselectForRowCount
SQL
DataSources, and only for operations
that express a customSQL
clause. In these
circumstances, we generally switch off paging because we are unable to generate a "row count"
query that tells the framework the size of the complete, unpaged resultset. The
useSubselectForRowCount
flag causes the framework to derive a rowcount query by
simply wrapping the entire customSQL clause in a subselect, like so:
SELECT COUNT(*) FROM ({customSQL clause here})
However, this is not guaranteed to give good results. Because the customSQL clause can contain anything that you can write in SQL, running it inside a subselect in order to count the rows might not work, might have unintended side-effects (if, for example, it is a stored procedure call that performs updates as part of its function), or it might just be a bad idea - for example, if the customSQL query is slow-running, you'll make it twice as slow with this flag, simply because you'll be running it twice. We recommend using this flag with care.
NOTE: This
setting can be overridden per-operation - see OperationBinding.useSubselectForRowCount
. You can also set a global default for this setting,
so you don't have to specify it in every dataSource - define
useSubselectForRowCount
as true in your server.properties
file.
Default value is null
public java.lang.String fileContentsField
fileContents
for FileSource
Operations
. If the fileContentsField is not configured, then a field named "fileContents"
or "contents" will be used, if it exists. If not found, the longest
text field which is not the fileNameField
, fileTypeField
or fileFormatField
will be used.
Note that the only method which will actually return the
fileContents is getFile()
-- the other
FileSource
methods omit the fileContents for the
sake of efficiency.
Default value is null
FileSource overview and related methods
public DSServerType serverType
Default value is "generic"
public java.lang.Boolean preventHTTPCaching
Note that this does not disable caching at higher
levels in the framework, for example, the caching performed by ResultSet
.
Default value is true
public boolean canMultiSort
Default value is true
public java.lang.Boolean requiresAuthentication
operationBindings
within the
DataSource may still override this setting by explicitly setting OperationBinding.requiresAuthentication
. Whether the user is authenticated is determined
by calling httpServletRequest.getRemoteUser()
, hence works with both simple J2EE
security (realms and form-based authentication) and JAAS (Java Authentication & Authorization
Service).
If you wish to use an authentication scheme that does not make use of the servlet
API's standards, Smart GWT Server also implements the setAuthenticated
method on
RPCManager
. You can use this API to tell Smart GWT that all the requests in the
queue currently being processed are associated with an authenticated user; in this case, Smart
GWT will not attempt to authenticate the user via
httpServletRequest.getRemoteUser()
You can set the default value for this
property via setting "authentication.defaultRequired" in server.properties
. This allows you to, for
example, cause all DataSources to require authentication for all operations by default.
Note that setting this property does not automatically cause an authentication mechanism to
appear - you still need to separately configure an authentication system. Likewise, setting
requiresAuthentication="false" does not automatically allow users to bypass your authentication
mechanism - you need to set up a URL that will accept DSRequests and process them similar to
the default "IDACall" servlet, and which is not protected by the authentication system. See
Deploying Smart GWT
for details on the IDACall
servlet.
Default value is null
public java.lang.Integer logSlowFetch
"fetch" operation
SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. See logSlowSQL
for more details.
Default value is null
public java.lang.String titleField
For example, for a DataSource of employees, a "full name" field would probably most clearly label an employee record.
If not explicitly set, the titleField is determined by looking for fields named "name", "dataSourceIdName", "title", "dataSourceIdTitle", "label", "dataSourceIdLabel", "id" and "dataSourceIdId". For example, for a DataSource with ID "customer", a field called customerName would be found if there were no "name" field. Search is case insensitive, and an underscore is allowed after dataSourceId (so that, for example, "CUSTOMER_NAME" would also be found and preferred).
For purposes of this search, any trailing numerals in the DataSource ID are discarded, so a DataSource with ID "office2" will search for title fields as if the ID were just "office".
If no field is found that matches any of the names above, then the first field is designated as the titleField.
Default value is see below
public java.lang.Boolean creatorOverrides
In order for this to work, we require two things:
this page
Default value is null
public java.util.Map resultSetClass
ResultSet
. This can be set to a custom subclass of ResultSet that, for example, hangs onto to extra information necessary for integration with web services.
Default value is null
public java.lang.Integer logSlowSQL
This
setting applies to all SQL queries, unless more specific thresholds are set using logSlowFetch
, logSlowAdd
, logSlowUpdate
, logSlowRemove
, logSlowCustom
or even more specific
affecting just the operationBinding it is configured at: operationBinding.logSlowSQL.
If
none of the thresholds above are set, global sql.log.queriesSlowerThan server.properties SQL setting
will be used.
For the
details on how to setup the logging part see the Special logging category: com.isomorphic.SLOW_SQL
Default value is null
public NullAccessType ownerIdNullAccess
ownerIdField
is in force,
specifies the access that is allowed to records with a null ownerIdField
. This
property has no effect if ownerIdField
is not specified. This property can be
used in conjunction with ownerIdNullRole
to create the concept of shared, or public, records. For example, if you set
ownerIdNullRole
to "administrator", any users with the "administrator" role will
be allowed to write records with a null ownerIdField
. If you also set
ownerIdNullAccess
to "view", all those records with a null owner will be viewable
by all, in addition to their own records. We use this functionality with the Saved Searches feature
, to enable precisely this:
users can save their own searches, which are private to them, but administrators can also save
searches with a null ownerIdField
, which become standard, shared searches that
appear to all users, in addition to their own private searches.
Default value is null
ownerIdField
,
ownerIdNullRole
public java.lang.String iconField
type
:"image" as the field to
use when rendering a record as an image, for example, in a TileGrid
. For example, for a DataSource of employees, a "photo" field of type "image" should be designated as the iconField.
If not explicitly set, iconField looks for fields named "picture", "thumbnail", "icon", "image" and "img", in that order, and will use any of these fields as the iconField if it exists and has type "image".
To avoid any field being used as the iconField, set iconField to null
.
Default value is see below
public java.lang.String forceSort
serverType
"sql" only, indicates whether we should automatically add a sort field for paged fetches
on this DataSource. If left
unset, this property defaults to the one of the global values described in the defaultSortField
documentation.
Also note, this property can be overridden per-operationBinding
. Note,
the ability to set this property per-DataSource is only provided to allow for complete
configurability in unusual cases. See the defaultSortField
docs for details of
why use of this property should be considered a red flag.
Default value is null
public DataSourceField[] addedAuditFields
fields
of the
Audit DataSource
.
This feature enables the storage of additional information in the Audit DataSource
alongside the
standard audit data. In order to do that the audited DataSource needs to declare auditDSConstructor
referring custom serverConstructor
, so that all requests to add data to the Audit DataSource
could be intercepted allowing to make changes to the new records (obtained using
DSRequest.getValues()
server-side API). In this particular use case values for the addedAuditFields
need
to be provided.
Example of an audited DataSource (schematically):
<DataSource audit="true" auditDSConstructor="package.AuditDS"> <fields>....</fields> <addedAuditFields> <addedAuditField name="altitude" type="float" /> <addedAuditField name="longitude" type="float" /> <addedAuditField name="logCorrelationId" type="text" /> </addedAuditFields> </DataSource>An example implementation of AuditDS could be as follows:
public class AuditDS extends SQLDataSource { public DSResponse executeAdd(DSRequest req) throws Exception { // populate additional fields Map values = req.getValues(); values.put("altitude", 54.685); values.put("longitude", 25.286); values.put("logCorrelationId", "foobar"); // execute "add" request return super.executeAdd(req); } }
Default value is null
DataSourceField
public DataSourceField[] fields
Each DataSource field can have type, user-visible title, validators, and other metadata attached.
Default value is null
DataSourceField
public java.lang.String ownerIdNullRole
ownerIdField
is in force,
specifies a role that will allow the ownerIdField
to take a null value. Any user
that has that role is allowed to create client-initiated "add" and "update" operations that
specify a null value for the ownerIdField
, and the system will persist the null
value rather than forcing in the currently authenticated user's user id as it normally would.
If any client-initiated "add" or "update" request specifies any non-null value for the
ownerIdField
, the normal behavior of the system will reassert and the current
user's user id will be forced into the ownerIdField
. This allows authorised
users (ie, those with the necessary role) to choose between saving public or private records,
just by sending a null or non-null value for the ownerIdField
. This property
has no effect if ownerIdField
is not specified.
This property can be used in
conjunction with ownerIdNullAccess
to create the concept of shared, or public, records - see that property's
documentation for an example.
Default value is null
ownerIdField
,
ownerIdNullAccess
public int endGap
loading
progressively
, indicates the number of extra records Smart GWT Server will advertise as being
available, if it detects that there are more records to view (see lookAhead
). This property has no
effect if we are not progressive-loading.
Default value is 20
public boolean omitNullDefaultsOnAdd
noNullUpdates
is also true, indicates that "add" requests on this DataSource will have null-valued fields
removed from the request entirely before it is sent to the server, as opposed to the default
behavior of replacing such null values with defaults.
Default value is false
noNullUpdates
public java.lang.String nullStringValue
noNullUpdates
is set, the
value to use for any text field that has a null value assigned on an update operation, and does
not specify an explicit nullReplacementValue
.
Default value is ""
noNullUpdates
,
com.smartgwt.client.docs.serverds.DataSourceField#nullReplacementValue
public java.lang.Boolean useOfflineStorage
browser-based offline storage
, and then use those stored
responses at a later time if we are offline (ie, the application cannot connect to the server).
Note that by default we do NOT use offline storage for a dataSource.
Default value is null
public java.lang.String projectFileKey
projectFile
, looks up the locations to use as projectFileLocations
from
the project's configuration (i.e. project.properties, server.properties
etc.). For instance, to look
up the value of project.datasources and use it for projectFileLocations
, use
"datasources" as the projectFileKey
.
If you specify both
projectFileKey
and projectFileLocations
, then both with be used,
with the projectFileLocations
applied last.
Default value is null
public java.lang.Integer logSlowUpdate
"update" operation
SQL
query execution time threshold in milliseconds, which if exceeded query is identified as
"slow" and may be logged under specific logging category. See logSlowSQL
for more details.
Default value is null
public java.lang.String defaultBooleanStorageStrategy
serverType:"sql"
DataSources, sets the default sqlStorageStrategy
to use for
boolean fields where no sqlStorageStrategy
has been declared on the field. Can
also be set system-wide via the Server_properties
setting
sql.defaultBooleanStorageStrategy
, or for a particular database configuration by
setting sql.dbName.defaultBooleanStorageStrategy
(see Admin Console overview
for more information on SQL
configuration).
Note that when this property is unset, the default DataSourceField.sqlStorageStrategy
strategy is effectively "string".
Default value is null
public MultiUpdatePolicy defaultMultiUpdatePolicy
operationBinding.allowMultiUpdate
or via the server-side API
DSRequest.setAllowMultiUpdate()
. Default value of null means this DataSource
will use the system-wide default, which is set via
datasources.defaultMultiUpdatePolicy
in server.properties
, and defaults to not allowing
multi updates for requests associated with an RPCManager, see MultiUpdatePolicy
for details.
Default value is null
OperationBinding.allowMultiUpdate
public java.lang.Boolean useParentFieldOrder
fields
from another DataSource (via inheritsFrom
), indicates that the
parent's field order should be used instead of the order of the fields as declared in this
DataSource. New fields, if any, are placed at the end.
Default value is null
public java.lang.String idClassName
@EmbeddedId
you have to specify class name of declared id@IdClass
you have to specify class specified in annotation
declarationDefault value is null
public java.lang.String auditChangedFieldsFieldName
auditing
enabled
, specifies the field name used to store the names of the fields which were updated.
If empty string is specified as the field name, the audit DataSource will not store this field.
Note that this field will only be set for update
operations.
Default value is "audit_changedFields"
public java.lang.String defaultSortField
serverType
"sql" only, the name of a field to
include in the ORDER BY
clause as a means of enforcing a stable sort
order, for paged fetches
only.
This property has no
effect for non-SQL dataSources, or for non-paged fetches.
Generally speaking, databases make no guarantee about the order of rows in a
resultset unless an ORDER BY
clause was provided. This is not usually a
problem if you actually don't care about the row order, but there is a catch if you
are using paged fetching: because the pages are fetched using completely different
queries, the database is at liberty to use different orderings from one fetch to another,
and in some cases, with some databases, that is what actually happens. This leads to
broken paging behavior, with some records duplicated and others omitted.
Note that it is unusual for a database to change strategies between queries like this; generally speaking, rows are ordered in some kind of natural ordering in the absence of an explicit order - typically insertion order, or by primary key value. However, it does happen, and is more likely with some database products than others.
This property only has an effect if forceSort
is in effect for the fetch
operation. See below for DataSource- and operation-level options, but ordinarily this
is arranged by setting the forceSort
property for the current database
configuration in your server.properties
file:
# Given this database definition sql.MyDB.database.type: mysql # Either of these settings will enable automatic sorting sql.MyDB.forceSort: true # Or sql.mysql.forceSort: trueNote, the
defaultSortField
should ideally provide a unique ordering: so
for an employee table, payroll number would be preferable to employee name. A
non-unique ordering will usually be sufficient to ensure stablity of ordering from one
query to the next, because it will usually ensure that the database is forced to use the
same index in each case. However, the database may still choose to order rows
differently within the confines of the non-unique ordering, so only a unique ordering
is guaranteed to ensure stability.
Fields of type
creatorTimestamp
are
also good
candidates for this purpose - assuming you have a suitable index in place, and assuming
sorting by temporal values does not introduce performance problems with your database of
choice - as they are often unique or near-to-unique, and they reflect the insertion
order, which is the "natural ordering" in some (not all) databases.
Note that this automatic sorting does not interfere with the ordinary sorting that your
application may do: it is applied in addition to any application sort order. So
if your application imposes no sort
order
, the resultset will
be sorted by the defaultSortField
; if your application requests a sort
order of, eg, "state" then "city", the resultset will be ordered by "state", then
"city", and then the defaultSortField
If forceSort
is enabled and you do not provide a
defaultSortField
for a given database, Smart GWT will instead use the
primaryKey
field(s). If
the dataSource does not
define a primaryKey
, we will just use the dataSource's first defined
field. Recommendation: Unless you have a reason to explicitly declare a
defaultSortField
, we recommend that you leave it undefined for any
DataSource that declares a primaryKey
(and we recommend that all
dataSources declare a primaryKey
). The primaryKey
field is
usually the ideal candidate for this purpose, because it is unique and almost certainly
indexed.
Note that forceSort
is enabled by default for PostgreSQL, because this
product is known to be less likely to retain a stable sort order between two similar,
unordered queries.
DataSource level
and
operationBinding level
.
However, this facility is
only provided to allow complete configurability in unusual cases. Generally speaking,
if a database requires ordering for correct behavior with paged fetches, it
always requires ordering for correct behavior with paged fetches; you can't
ordinarily pick and choose which tables or which individual fetches need to be ordered.
That said, there may be real world cases where a database that normally requires ordering for correct behavior, nevertheless has individual cases where that is not required - maybe on tables that have only a single index, or in cases where there are no joins involved, or maybe in other circumstances related to how that specific database product works internally. Or again, there may be unusual individual cases where a database that ordinarily works fine for paged fetches without requiring ordering, needs to apply an ordering.
We provide the DataSource- and operation-level forceSort
flags to allow
you to work around or take advantage of these database-specific quirks. However, use of
them should be considered a red flag because they might cause problems if things change
in the future (new database release, change in the underlying query, addition of a
foreignKey relation at the database level, etc).
Default value is null
public java.lang.Boolean autoDeriveSchema
inherit from
the special
super-DataSource. This allows you to
auto-derive schema from existing metadata, whilst still being able to override any or all
of it as required. By default additional derived field definitions are placed at the end,
but that can be changed by useParentFieldOrder
flag.
Also, derived field
definitions may be hidden using showLocalFieldsOnly
.
This property has a different implementation depending upon the
serverType
of the
DataSource:
schemaBean
. If
schemaBean
is not specified, derive the schema from the columns in the SQL
table specified in tableName
.
More information on SQL DataSources
is here
schemaBean
property. If no
such thing exists, derive the schema from
the Hibernate mapping or Java class specified in the beanClassName
property (this allows you to specify schema and mapping separately, in the unusual
circumstance that you have a need to do so). Note that the "mappings" referred to here
can mean either .hbm.xml
files or annotated classes; both are supported.
If neither of these is successful, derive the schema from the underlying SQL table
specified in tableName
. More
information on Hibernate DataSources is
here
schemaBean
property. If the schemaBean property is not defined, derive the schema from the
annotated JPA class named in the beanClassName
property (as with
Hibernate, this allows you to specify schema and mapping separately if you need to do
so). JPA DataSource generation relies on annotations (the orm.xml mapping file is not
supported). More information on JPA DataSources is here
schemaBean
property. If no
such bean is found (or Spring is not
present), attempt to instantiate an object whose fully-qualified class name is the value
in the schemaBean
property. If one of these approaches succeeds, we derive
the schema from the discovered object (by treating it as a Java Bean and assuming that
each one of its getters corresponds to a like-named field in the DataSource). More
information on custom DataSource implementations is here
.primary key
fields at the top.
DataSource types
when we use an SQL table as a
source of metadata
for a SQL or Hibernate DataSource:
SQL type | DataSource type |
---|---|
CHAR, VARCHAR, LONGVARCHAR, TEXT, CLOB | text |
BIT, TINYINT, SMALLINT, INTEGER, BIGINT, DECIMAL*, NUMBER** | integer |
REAL, FLOAT, DOUBLE, DECIMAL*, NUMBER** | float |
DATE | date |
TIME | time |
TIMESTAMP | datetime |
BLOB, BINARY, VARBINARY, LONGVARBINARY | binary |
The following table shows how Java types are derived into DataSource types when we use an unannotated Java class (Spring bean, Hibernate mapping or POJO) as a source of metadata for a SQL, Hibernate or custom DataSource:
Java type | DataSource type |
---|---|
boolean, Boolean | boolean |
char, Character, String, Reader | text |
byte, short, int, long, Byte, Short, Integer, Long, BigInteger | integer |
float, double, Float, Double, BigDecimal | float |
Enum | enum (see discussion below) |
InputStream | binary |
java.sql.Date, java.util.Date, java.util.Calendar | date |
java.sql.Time | time |
java.sql.Timestamp | datetime |
Finally, this table shows how Java types are derived into DataSource types when we use an
annotated class as a source of metadata. Note annotated classes are necessary for JPA
DataSources, but you can choose to use them for other types of DataSource as well.
For Hibernate DataSources, this is very worthwhile because Hibernate will also make use
of the annotations as config, meaning you don't need to specify .hbm.xml
files. For SQL and custom DataSources, there is no benefit at the persistence level,
but it may still be worthwhile because the use of an annotated class gives us better
metadata and allows us to generate a better, closer-fitting autoDerive DataSource than
we can from examination of SQL schema or plain Java Beans:
Java type | DataSource type |
---|---|
boolean, Boolean | boolean |
char, Character, String, Reader | text |
byte, short, int, long, Byte, Short, Integer, Long, BigInteger | integer |
float, double, Float, Double, BigDecimal | float |
InputStream | binary |
java.util.Date (with Temporal set to DATE), java.sql.Date | date |
java.util.Date (with Temporal set to TIME), java.sql.Time | time |
java.util.Date (with Temporal set to TIMESTAMP), java.util.Calendar, java.sql.Timestamp | datetime |
Enum (with Enumerated set to STRING) | enum (see discussion below) |
Enum (with Enumerated set to ORDINAL) | intEnum (see discussion below) |
Field with Lob annotation | binary |
Field with GeneratedValue annotation | sequence, if the field is an integer type (see discussion below) |
If the metadata source is an SQL table:
DatabaseMetaData.getPrimaryKeys()
APIprimaryKey: true
DatabaseMetaData.getColumns()
is inspected. If the metadata includes
IS_AUTOINCREMENT=YES
, we mark the corresponding field as
type="sequence"
. This information should be reliably provided by
databases that implement "auto-increment" or "identity" column types, such as MySQL
or Microsoft SQL ServerResultSetMetaData
obtained by running a dummy query on the table. If
the isAutoIncrement()
API returns true for that column, we mark the
corresponding field as type="sequence"
TYPE_NAME
in the column metadata. If it is "serial", this means the
column is a PostgreSQL "serial" or "serial8" type column. Postgres does not
transparently implement auto-increment columns, but it does provide this serial
type, which causes the column to be implicitly bound to an underlying sequence. So
this type causes us to mark the field type="sequence"
, and we also set
implicitSequence
trueCOLUMN_DEF
in the column metadata. If this contains the token "$$ISEQ"
and ends with "NEXTVAL", this means the column is an Oracle "GENERATED AS IDENTITY"
column. This type of column was introduced in Oracle 12c and is conceptually
exactly the same thing as the Postgres "serial" column described above. We treat
it the same way: mark it type="sequence"
and
implicitSequence="true"
server.properties
flag auto.derive.integer.pk.always.sequence
is true, we mark the field as type="sequence"
.ds.xml
file:<DataSource serverType="sql" tableName="myTable" autoDeriveSchema="true"> <fields> <!-- This field was incorrectly marked as a sequence --> <field name="notASeq" type="integer" /> <!-- This field was incorrectly marked as an integer when it should be a sequence --> <field name="isASeq" type="sequence" /> </fields> </DataSource>
If the metadata source is Hibernate mappings described in a .hbm.xml
file:
If the metadata source is an annotated object (whether JPA, Hibernate or just an annotated POJO):
@Id
annotation is is marked as a primaryKey (this
differs from the Hibernate .hbm.xml
file case because that is specific
to Hibernate, which does support composite keys, but not by specifying multiple
<id> tags. Annotations are supported, via annotated POJOs, for any kind of
persistence strategy, so multiple @Id
fields are perfectly valid)@GeneratedValue
annotation is either marked as
type="sequence"
(if it is an integer type) or as
autoGenerated
="true"
(for other
field types)Enum
properties in plain or annotated classes,
as well as setting the field type as noted in the above tables, we also generate a
valueMap for the field, based on the Enum
members.
For cases where we generate a field of Smart GWT type "enum" (see the above tables),
the keys of the valueMap are the result of calling name()
on each member
of the underlying Java Enum (in other words, its value exactly as declared in its
enum declaration). For cases where we generate a field of Smart GWT type "intEnum",
the keys of the valueMap are strings representing the ordinal number of each member
in the Java Enum - "0", "1", etc. Note that this behavior will be overriden by
DataSource.enumTranslateStrategy
if both are set.
In both of these case, the display values generated for the valueMap are the result
of calling toString()
on each Enum member. If that gives the same
value as calling name()
, the value is passed through
DataTools.deriveTitleFromName()
, which applies the same processing rules
as getAutoTitle()
to derive a more
user-friendly display value.
schemaBean
implies autoDeriveSchema
, because it has no other
purpose than to name the bean to use for auto-derived schema. Thus, if you specify
schemaBean
you do not need to specify autoDeriveSchema
as well
(though it does no harm to do so). However, tableName
and
beanClassName
can be validly specified without implying
autoDeriveSchema
, so in those cases you must explicitly specify
autoDeriveSchema
.
The underlying super-DataSource is cached in server memory, so that it does
not have to be derived and created each time you need it. However, the cache manager
will automatically refresh the cached copy if it detects that the deriving DataSource
has changed. Thus, if you change the metadata your DataSource is deriving (if, for
example, you add a column to a table), all you need to do is touch the
.ds.xml
file (ie, update its last changed timestamp - you don't actually
have to change it) and the cached copy will be refreshed next time it is needed.
When autoDeriveSchema is set, SQLDataSource will automatically discover foreignKeys and
deliver table and column name information to the client in hashed form so that two
DataSources that are linked by native SQL foreign keys will automatically discover each
other if loaded into the same application, and set
foreignKey
automatically.
Because the table and column
names are delivered as cryptohashes, there is no information leakage, but regardless,
the feature can be disabled via setting datasource.autoLinkFKs
to false in
server.properties
. This hashed linkage
information is
delivered to the client in properties tableCode
and
DataSourceField.fkTableCode
/fkColumnCode
Default value is null
public java.lang.Boolean useSequences
serverType:"sql"
, this flag indicates whether any fields of type
"sequence" should be backed by a
native database sequence (if the flag is true) or an auto-increment/identity column (if it is
false). It is only applicable in cases where the database in use supports both approaches,
and Smart GWT supports both strategies with that particular database. For most
databases, even those that natively support either approach, Smart GWT uses one or the other,
and this cannot be configured. Right now, the only supported database is Microsoft SQL Server. If you specify this flag on a non-SQL DataSource or if any database other than SQL Server is in use, the flag is simply ignored.
If not set, this flag defaults to the
server.properties
setting sql.{dbName}.use.sequences
, which in turn
defaults to false.
Default value is null
public java.lang.Boolean allowAdvancedCriteria
AdvancedCriteria
on fetch or filter type operations. This
property may be set to false
to indicate that this dataSource does not support
advancedCriteria. See supportsAdvancedCriteria()
for further information on this. NOTE: If you specify
this property in a DataSource descriptor (.ds.xml
file), it is enforced on the
server. This means that if you run a request containing AdvancedCriteria against a DataSource
that advertises itself as allowAdvancedCriteria:false
, it will be rejected.
Default value is null
OperationBinding.allowAdvancedCriteria
public java.lang.String schema
Defines the name of the schema we use to qualify the tableName
in generated SQL. If you do
not provide this property, table names will not be qualified in generated SQL, and thus the
default schema will be used. Support for multiple schemas (or schemata) varies quite
significantly across the supported databases, as does the meaning of the phrase "default
schema". In addition, some databases allow you to override the default schema in the JDBC
connection URL, which is a preferable approach if all your tables are in the same
(non-default) schema.
The following table provides information by product:
Product | Notes |
DB2 | Arbitrarily named schemas are supported. The default schema is named after the connecting user, though this can be overridden by specifying the "currentSchema" property on the JDBC connection URL |
DB2 for iSeries | Arbitrarily named schemas are supported. "Schema" is synonymous with "library". The default schema depends on the setting of the "naming" connection property. When this is set to "sql", behavior is similar to other DB2 editions: the default schema is named after the connecting user, unless overridden by specifying a library name in the JDBC connection URL. When "naming" is set to "system", the schema of an unqualified table is resolved using a traditional search of the library list; the library list can be provided in the "libraries" property |
Firebird | Firebird does not support the concept of schema
at all - all "schema objects" like tables and indexes belong directly to the database. In
addition, Firebird actively rejects qualified table names in queries as syntax errors;
therefore, you should not set the schema property for a DataSource that
will be backed by a Firebird database |
HSQLDB | Arbitrarily named schemas are supported. The default schema is auto-created when the database is created; by default it is called "PUBLIC", but can be renamed. It is not possible to set the default schema in the JDBC connection URL |
Informix | Informix databases can be flagged as "ANSI mode" at creation time. ANSI-mode databases behave similarly to DB2 for schema support: arbitrarily named schemas are supported, and the default schema is the one named after the connected user. Non-ANSI databases have no real schema support at all. It is not possible to set the default schema in the JDBC connection URL with either type of database |
Microsoft SQL Server | Prior to SQL Server 2005, schema support is similar to Oracle: "schema" is synonymous with "owner". As of SQL Server 2005, schema is supported as a separate concept, and a user's default schema can be configured (though it still defaults to a schema with the same name as the user). It is not possible to set the default schema in the JDBC connection URL |
MySQL | MySQL does not have a separate concept of "schema"; it treats the terms "schema" and "database" interchangeably. In fact MySQL databases actually behave more like schemas, in that a connection to database X can refer to a table in database Y simply by qualifying the name in the query. Also, because schema and database are the same concept in MySQL, overriding the "default schema" is done implicitly when you specify which database to connect to in your JDBC connection URL |
Oracle | Arbitrarily named schemas are not supported; in Oracle, "schema" is synonymous with "user", so each valid user in the database is associated implicitly with a schema of the same name, and there are no other schemas possible. It is possible to refer to tables in another user's schema (assuming you have the privileges to do so) by simply qualifying the table name. The default schema is always implied by the connecting user and cannot be overridden. |
Postgres | Arbitrarily named schemas are supported. Rather than the concept of a "default schema", Postgres supports the idea of a search path of schemas, whereby unqualified table references cause a search of the list of schemas in order, and the first schema in the path is the "current" one for creation purposes. Unfortunately, there is no way to specify this search path on the JDBC connection URL, so the default schema comes from the user definition, ultimately defaulting to the default "public" schema |
Default value is null
public int nullIntegerValue
noNullUpdates
is set, the
value to use for any integer field that has a null value assigned on an update operation, and
does not specify an explicit nullReplacementValue
.
Default value is 0
noNullUpdates
,
com.smartgwt.client.docs.serverds.DataSourceField#nullReplacementValue
public boolean audit
When auditing is enabled, every time a DSRequest modifies this DataSource, a Record is added to the audit DataSource that shows the record as it existed after the change was made (or for a "remove", the values of the record at the time of deletion). In addition, the audit DataSource has the following additional metadata fields:
"audit_operationType"
: type of the change ("update", "add" or "remove")
"audit_modifier"
:
username of the user that made the change. The username is
determined in the same way that the
Declarative Security
subsystem determines the
current user.
"audit_changeTime"
: a field of type "datetime" recording
the timestamp of the change
"audit_revision"
: a field of type "sequence" recording a
simple increasing integer value
"audit_changedFields"
: a
"multiple"
field of type
"string". For "update"
operations, records which fields have changed; otherwise, null
If any of the field names above collide with field names of the DataSource being audited, an integer suffix will also be added, starting with 2 (for example, "audit_modifier2", then "audit_modifier3", etc).
To omit a data field from the automatically generated audit DataSource, just set
DataSourceField.audit
to false.
Audit can be disabled for a given DSRequest via
the server-side API DSRequest.setSkipAudit()
, or for a specific operation
via the operationBinding.skipAudit
setting.
When viewing DataSources in the DataSource
Navigator
, a button will
be shown at the top of a DataSource's section if it has an audit DataSource to let you
conveniently open another section to view it.
Note: The DataSource audit feature works only with single row operations; operations with
allowMultiUpdate
enabled are not supported.
The audit DataSource is normally automatically generated, and unless otherwise specified
with auditDataSourceID
,
the ID of the audit DataSource will be
audit_[OriginalDSID]
.
By default, the automatically generated audit DataSource will be of the same type as the
DataSource being audited, however, if the DataSource being audited is not already a
SQLDataSource, we recommend using auditDSConstructor:"sql"
to
use
a SQLDataSource as the audit DataSource. This is because a SQLDataSource used an audit
DataSource will automatically generate a SQL table for storing audit data the first time
changes are made. JPA would require manual creation of a Java Bean, and Hibernate requires
hbm2ddl.auto=update
to be set,
which is widely considered unsafe for production use.
Note that the automatically generated audit DataSource may have additional fields that can be
populated when new
audit data is added. See addedAuditFields
for more details.
Automatically created audit DataSources can be loaded and queried just like other
DataSources, using the DataSourceLoader, and using the server-side API
DataSource.getAuditDataSource()
. However, you must load the DataSource
being audited before loading its automatically created audit DataSource.
Note, that automatic SQL tables creation can be disabled. See
autoCreateAuditTable
for details.
Audit DataSources utilize authenticated username (see the docs for
RPCManager.getUserId()
server-side
API) to populate the "audit_modifier" field. To enable quick access to additional user
information, you can associate
them with a custom "Users" DataSource.
This association can be configured via the framework setting "userDataSource.foreignKey" in the
"server.properties"
file, which establishes a relationship between authenticated user and your custom "Users"
DataSource. Declaring this
informs the system that the authenticated username is a valid ID for records within a specific
"Users" DataSource.
Use the regular DataSourceField.foreignKey
format, where, in example below, "UserDS" represents the name of
the
related "Users" DataSource, and "userName" serves as the primary key of that DataSource:
userDataSource.foreignKey: UserDS.userNameThis configuration enables you to access additional user information seamlessly through built-in framework features like
DSRequest.additionalOutputs
and ListGridField.includeFrom
when
reviewing audit data. For instance,
if "UserDS" declares fields such as "firstName" and "lastName," you can retrieve them using
additional listGridFields:
{name: "userFirstName", includeFrom: "UserDS.firstName"}, {name: "userLastName", includeFrom: "UserDS.lastName"}Alternatively, if you're fetching data manually, you can utilize additionalOutputs as follows:
additionalOutputs: "userFirstName!UserDS.firstName,userLastName!UserDS.lastName"
The audit DataSource can also be manually created. In this case, you can
can either follow the naming conventions described above for the ID of the audit DataSource
and the names of metadata fields, or use the linked properties to assign custom names. If
you omit any data fields from the tracked DataSource in your audit DataSource, those fields
will be ignored for auditing purposes, exactly as though DataSourceField.audit
had
been set to false for an automatically-generated audit DataSource.
Also, note that in case of manually defined audit DataSource, if this DataSource is defined so it inherits the audited DataSource, all the audited DataSource's fields will be inherited, this including the primary keys. Since for the audit DataSource the primary key should be the revision field, in order to prevent the audit DataSource having two primary keys, the inherited DataSource's primary key will have to be declared in audit DataSource, but with the primaryKey attribute omitted (as well not being of type "sequence") in the audit DataSource.
Default value is false
public java.util.Map resultTreeClass
ResultTree
. This can be set to a custom subclass of ResultTree that, for example, hangs on to extra information necessary for integration with web services.
Default value is null
public java.lang.String guestUserId
ownerIdField
if no one has authenticated. This setting can be overridden at the operationBinding level.
Default value is null
public boolean autoCreateAuditTable
autoCreateAuditTable
to true
indicates that audit DataSource
will automatically create SQL table when auditing
is enabled. Note, that
autoCreateAuditTable
attribute takes effect only if framework setting
audit.autoCreateTables
in server.properties
is set to
false
, which by default is set to true
.
Default value is true
public java.lang.String serverOnly
serverOnly="true"
ensures that it will not be visible
to the client. Any request through IDACall to this DataSource will return a failure response.
Only requests which have been initiated on the server-side will be executed against this
DataSource.
Default value is null
public java.lang.String description
OpenAPI specification
generated by the framework.
Markdown is a commonly used syntax, but you may also embed HTML content in a CDATA tag.
Default value is null
public java.lang.String requiresRole
OperationBinding.requiresRole
, but controls access to the DataSource as a whole.
Default value is null
public boolean compareMetadataForAuditChangeStatus
binary fields
on audited
DataSources. When determining
if a binary field has changed for auditing purposes, should we compare the metadata values (ie,
the associated _filename
and _filesize
fields) or the actual binary
content? If you set this flag to false, this will cause Smart GWT to fetch the existing
content of any binary field from the database before any update, and then compare it byte by
byte to the new content. You should consider if this will have performance implications for
your application, particularly if you store large binary values.
Note that value
comparison of any kind is only performed if the field's DataSourceField.audit
setting is
"change", but also note that this is the default setting for binary fields
Default value is true
public java.lang.Boolean quoteColumnNames
In general we
recommend that you allow the database to use its natural naming scheme when creating tables
(put more simply, just do not quote column names in the CREATE TABLE
statement);
if you do this, you will not need to worry about quoting column names when querying. However,
if you are dealing with pre-existing tables, or do not have control over the database naming
conventions used, this property may become necessary. This property may also be necessary if
you are using field/column names that clash with reserved words in the underlying database
(these vary by database, but a field called "date" or "timestamp" would have problems with most
database products)
Note: Only applicable to dataSources of serverType
"sql".
Default value is null
public java.lang.String fileFormatField
fileFormat
for FileSource Operations
.
If the fileFormatField is not configured, then a field named "fileFormat" will be used, if it exists. Otherwise, the DataSource will not track fileFormats -- this may be acceptable if, for instance, the fileFormat is always the same.
The fileFormat is specified according to the extension that would have been used in the filesystem -- for instance, the fileFormat for employees.ds.xml would be "xml".
Default value is null
FileSource overview and related methods
public java.lang.Boolean trimMilliseconds
Note that there is no inherent
support for millisecond precision in Smart GWT widgets; if you need millisecond-precise
visibility and editability of values in your client, you must write custom formatters and
editors (or sponsor the addition of such things to the framework). Server-side,
millisecond-precise values are delivered to and obtained from DataSources, so DataSource
implementations that are capable of persisting and reading millisecond values should work
transparently. Of the built-in DataSource types, the JPA and Hibernate DataSources will
transparently handle millisecond-precise values as long as the underlying database supports
millisecond precision, and the underlying column is of an appropriate type. The SQLDataSource
provides accuracy to the nearest second by default; you can switch on millisecond precision
per-field with the storeMilliseconds
attribute.
Default value is null
public DSRequest requestProperties
DSRequest
s made
by this DataSource. This must be set before any DSRequest
s
are issued and before any component is bound to the DataSource. These properties are
applied before transformRequest()
is called.
Default value is null
public java.lang.String auditTypeFieldName
auditing
enabled
, specifies the field name used to store the operationType
(in a field of type "text"). If empty
string is specified as the field name, the audit DataSource will not store this field.
Default value is "audit_operationType"
public java.lang.String tableCode
tableCode
and the
related properties DataSourceField.columnCode
, DataSourceField.fkTableCode
and
DataSourceField.fkColumnCode
are read-only attributes that are secure and unique cryptographic
hashes of table and column names used by this DataSource.
These properties are used
automatically by client-side framework code to link dataSources together by foreign key
when a
foreignKey
is not explicitly declared, but is found in the SQL schema via the
autoDeriveSchema
feature.
A secure hash is used rather than the actual SQL table or column name for security reasons - sending the actual SQL table or column name to the client could aid in attempted SQL injection attacks.
This feature can be disabled system-wide via setting
datasource.autoLinkFKs
to false
in server.properties
.
Default value is null
public java.lang.Integer auditChangedFieldsFieldLength
auditing
enabled
, specifies the length of the field used
to store the names of the fields which were updated. See also
auditChangedFieldsFieldName
To set the changedFields field length for all DataSources that do not override the default,
set audit.auditChangedFieldsFieldLength
in your server.properties
file. For example
audit.auditChangedFieldsFieldLength: 512
Default value is 255
public DSInheritanceMode inheritanceMode
serverType
"sql" and "hibernate", specifies the inheritance mode to use. This property has no effect for
any other type of DataSource.
Default value is "full"
inheritsFrom
public float nullFloatValue
noNullUpdates
is set, the
value to use for any float field that has a null value assigned on an update operation, and
does not specify an explicit nullReplacementValue
.
Default value is 0.0
noNullUpdates
,
com.smartgwt.client.docs.serverds.DataSourceField#nullReplacementValue
public java.lang.String schemaNamespace
WebService.getSchema()
.
Default value is null
public java.lang.Boolean qualifyColumnNames
serverType
"sql", determines whether we qualify column names with table names in any SQL we generate.
This property can be overridden on specific operationBindings.
Default value is true
OperationBinding.qualifyColumnNames
public java.lang.String auditRevisionFieldName
auditing
enabled
, specifies the field name used to store the revision number for the change (in a field
of type "sequence"). If empty string is specified as the field name, the audit DataSource will
not store this field.
Default value is "audit_revision"
public java.lang.String dataURL
OperationBinding.dataURL
. NOTE: Best practice is to use the same dataURL
for
all DataSources which fulfill DSRequests via the server-side RPCManager API. Otherwise,
cross-DataSource operation queuing
will
not be possible.
Default value is null
public java.lang.String jsonPrefix
The inclusion of such a prefix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.
Only applies to responses formatted as json objects. Does not apply to
responses returned via scriptInclude type transport.
Note: If the prefix / suffix served by
your backend is not a constant, you can use dataFormat:"custom"
instead and
explicitly parse the prefix out as part of transformResponse()
.
Default value is null
public java.lang.String relatedTableAlias
SQL DataSource
that is referred by additional foreign keys
, this
property defines the table alias name to use in generated SQL. If omitted DataSource ID
will be used to construct the
alias. Aliasing is necessary when the same table appears more than once in a query. In
addition to use cases described in DataSourceField.relatedTableAlias
, this may happen when includeFrom
field using
foreign key defined in
otherFKs
would be included multiple times in a related DataSource.
See the "Automatically
generated table aliases" section of the SQL
Templating
for the complete set of general rules how aliases are generated. Also, see dataSourceField.otherFKs
for more
details and usage samples.
Default value is null
public java.lang.String[] projectFileLocations
projectFile
,
specifies locations for the project files. In XML, each location is
expressed with a <location>
tag, e.g.:
<projectFileLocations> <location>[WEBROOT]/shared/ds</location> <location>ds://datasources</location> </projectFileLocations>Directories should be specified as absolute paths on the server. If you want to construct a webroot-relative path, then prefix the path with
[WEBROOT]
(unlike in
server.properties
, where you would use
$webRoot
as the prefix).
To specify another DataSource to be used via
fileSource operations
, use ds://dsName
(where "dsName" is the name of the other DataSource).
A projectFile
DataSource uses the standard
fileSource
field names: fileName
,
fileType
, fileFormat
,
fileContents
, fileSize
and
fileLastModified
. When defining a projectFile
DataSource, you can use inheritsFrom
with
a value of "ProjectFile" to inherit definitions for these fields -- e.g.:
<DataSource ID="MyDataSources" type="projectFile" inheritsFrom="ProjectFile"> <projectFileLocations> <location>[WEBROOT]/shared/ds</location> <location>ds://datasources</location> </projectFileLocations> </DataSource>
For directory locations, the
fileName
is relative to the directory specified. Note that
the fileName
does not include any extension for type or
format. For instance, for "employees.ds.xml", the fileName
would be "employees", the fileType
would be "ds" and the
fileFormat
would be "xml".
A projectFile DataSource executes the various
fileSource operations
in the following manner.
The general rule is that fileName
, fileType
,
and fileFormat
are treated as primary keys. If files with the
same combination of those attributes exist in more than one of the
configured locations, the locations are considered in reverse
order, with priority given to the location listed last. When modifying
an existing file, the last location which contains the file will be
used. When creating a new file, the file will be created in the last
configured location.
listFiles
listFiles
does not
recurse into subdirectories. If the same combination of
fileName / fileType / fileFormat
exists in more than
one configured location, then the data for fileSize
and
fileLastModified
will be taken from the last configured
location which contains the file.
hasFile
getFile
saveFile
renameFile
listFiles
operation will return the file from the other location (as well
as the renamed file).
removeFile
listFiles
operation will return the file from the other location.
projectFile
DataSource also responds to the standard
DataSource operations, in the following manner:
saveFile
operation, either adding the file or updating
an existing file.
listFiles
operation. Note that the results will not
include the fileContents
. In order to obtain the
fileContents
, you must use a
getFile operation
.
renameFile
operation. Note that this will not update
the fileContents
-- for that, you need to use "add", or
a saveFile operation
.
removeFile
operation.
If you specify both projectFileKey
and
projectFileLocations
, then both with be used, with the
projectFileLocations
applied last.
Default value is null
public java.lang.String ownerIdField
DSRequest.isClientRequest()
returns true on the server).
Note, the behaviors described below can be affected by the dataSource properties
ownerIdNullRole
and
ownerIdNullAccess
, so
please read the documentation
for those two properties in conjunction with this article.
When a new row is added by a client-initiated DSRequest
,
the
ownerIdField will be automatically populated with the currently
authenticated user (clobbering any value supplied by the client).
Client-initiated attempts to update the ownerIdField will also be
prevented.
If you wish to set the ownerIdField to a different value via an "add"
or "update" operation, you can do so in server-side DMI code (possibly
consulting DSRequest.getClientSuppliedValues()
to get the
value that was clobbered).
For client-initiated "fetch", "update" or "remove" operations, the
server will modify client-supplied criteria so that only rows whose
ownerIdField matches the currently authenticated user can be read,
updated or deleted. For built-in DataSource types (SQL, Hibernate and
JPA), the additional criteria required to match the ownerIdField
field will ignore the prevailing
textMatchStyle
and always use
exact
equality. If you have a custom or generic DataSource implementation,
you will want to do the same thing, to avoid false positives on
partial matches (eg, a user with name "a" gets records where the owner
is any user with an "a" in the name). You can determine when this is
necessary by looking for a DSRequest
attribute called
"restrictedOwnerIdField". For example, code similar to the following:
String restrictedField = (String)dsRequest.getAttribute("restrictedOwnerIdField"); if (field.getName() != null && field.getName().equals(restrictedField)) { // Use exact matching for this field } else { OK to use the textMatchStyle }Also note, for server-initiated requests, this automatic criteria-narrowing is not applied; if your application requires server-initiated "fetch", "update" and "remove" requests to be limited to the currently-authenticated user, your code must add the necessary criteria to the request.
The ownerIdField setting can be overridden at the
OperationBinding.ownerIdField
level.
If ownerIdField is specified,
requiresAuthentication
will
default to true
. If requiresAuthentication
is
explicitly set to false
, then unauthenticated users will be
able to see all records. To avoid this, you can use
guestUserId
to specify a
default user to
apply when no one has authenticated.
Default value is null
OperationBinding.ownerIdField
,
guestUserId
public int lookAhead
loading
progressively
, indicates the number of extra records Smart GWT Server will read beyond the
end record requested by the client, in order to establish if there are more records to view.
This property has no effect if we are not progressive-loading. This property can be
tweaked in conjunction with endGap
to change behavior at the end of a dataset. For example, with the default values of
lookAhead: 1
and endGap: 20
, we can end up with the viewport
shrinking if we get a case where there really was only one more record (because the client was
initially told there were 20 more). This is not a problem per se, but it may be surprising to
the user. You could prevent this happening (at the cost of larger reads) by setting
lookAhead
to be endGap+1
.
Default value is 1
public java.lang.String childrenField
DataSourceField.childrenProperty
directly on
the childrenField object.
By default the children field will be assumed to be multiple
,
for XML databinding. This implies that child data should be delivered in the format:
<childrenFieldName> <item name="firstChild" ...> <item name="secondChild" ...> </childrenFieldName>However data may also be delivered as a direct list of
childrenFieldName
elements:
<childrenFieldName name="firstChild" ...> <childrenFieldName name="secondChild" ...>If you want to return your data in this format, you will need to explicitly set
multiple
to false in the appropriate dataSource field definition.
Default value is null
public java.lang.String inheritsFrom
fields
from. Local fields (fields
defined in this DataSource) are added to inherited fields to form the full set of fields.
Fields with the same name are merged in the same way that databound component fields
are merged
with DataSource fields.
The default order of the combined fields is new local fields first
(including any fields present in the parent DataSource which the local DataSource re-declares),
then parent fields. You can set useParentFieldOrder
to
instead use the parent's field order, with new local fields appearing last. You can set showLocalFieldsOnly
to have
all non-local fields hidden.
Note that only fields are inherited - other properties
such as dataURL and dataFormat are not. You can use ordinary inheritance, that is, creating a
subclass of DataSource, in order to share properties such as dataURL across a series of
DataSources that also inherit fields from each other via inheritsFrom
.
This feature can be used for:
databound
components
. XML Schema
or other metadata formats databound components
to "customizedEmployee".
Customizations of fields (including appearance changes, field order, new fields, hiding of
fields, and custom validation rules) can be added to "customizedEmployee", so that they are
kept separately from the original field data and have the best possible chance of working with
future versions of the "employee" dataSource. Default value is null
public java.lang.String auditedDataSourceID
audited
DataSource. Automatically
populated for auto-generated
audit DataSources.
Default value is varies
public boolean nullBooleanValue
noNullUpdates
is set, the
value to use for any boolean field that has a null value assigned on an update operation, and
does not specify an explicit nullReplacementValue
.
Default value is false
noNullUpdates
,
com.smartgwt.client.docs.serverds.DataSourceField#nullReplacementValue
public Date nullDateValue
noNullUpdates
is set, the
value to use for any date or time field that has a null value assigned on an update operation,
and does not specify an explicit nullReplacementValue
.
Unlike strings and numbers, there is no "natural" choice for a null replacement value for dates. The default value we have chosen is midnight on January 1st 1970, simply because this is "the epoch" - the value that is returned by calling "new Date(0)"
Default value is See below
noNullUpdates
,
com.smartgwt.client.docs.serverds.DataSourceField#nullReplacementValue
public java.lang.String dataField
DataBoundComponent
needs to show a short summary of a
record. For example, for a DataSource of employees, good choices might be the "salary" field, "hire date" or "status" (active, vacation, on leave, etc).
Unlike titleField
, dataField is not
automatically determined in the absence of an explicit setting.
Default value is null