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## org.eclipse.birt.report.model.api
Class DataSetHandle

    java.lang.Object
      org.eclipse.birt.report.model.api.DesignElementHandle
          org.eclipse.birt.report.model.api.ReportElementHandle
              org.eclipse.birt.report.model.api.DataSetHandle

All Implemented Interfaces:
  org.eclipse.birt.report.model.elements.interfaces.IDataSetModel, org.eclipse.birt.report.model.elements.interfaces.IDesignElementModel, org.eclipse.birt.report.model.elements.interfaces.ISimpleDataSetModel

Direct Known Subclasses:
  JointDataSetHandle, OdaDataSetHandle, ScriptDataSetHandle

    public abstract class DataSetHandle

extends ReportElementHandle
implements org.eclipse.birt.report.model.elements.interfaces.IDataSetModel, org.eclipse.birt.report.model.elements.interfaces.ISimpleDataSetModel

Abstract handle for data set elements. A data set is a named object that provides a result set defined as a sequence of data rows. Report elements use data sets to retrieve data for display.

A data set has three key parts:

- Data access: Retrieving data from an external data source.
- Report-specific properties: Properties for how the data is to be used in the report such as rules for searching, data export and so on.
- Data transforms: Rules for processing the data for use by the report. Data transforms are most frequently defined by report items that use the data set, and are applied to the result set by BIRT.

Data transforms that can be defined on a data set include:

- Column projections: identifying additional required columns, assigning column aliases, and providing column meta-data.
- Filters.
- Computed columns. Sorting, grouping, aggregations and similar transforms are defined by the report elements that use the data set.

The application can use scripts to execute code on certain data set events.

To get a handle for the data source, uses the following example:

                            DataSetHandle dataHandle = designHandle
                          findDataSet( "My First Data Set " );

This class works with the static design definition of the data set. Many clients will prefer to work with the TBD class that provides both the static definition and additional design information retrieved from the data provider. For example, a particular data set may not define a result set in the design file if the data provider can provide the result set definition itself. This handle will return null for the result set handle. However, the TBD class will provide the full result set: either by returning the one in the design file, or by obtaining it from the data provider.

See Also:
  `SimpleDataSet`

Field Summary

Fields inherited from class org.eclipse.birt.report.model.api.ReportElementHandle
`element`

Fields inherited from class org.eclipse.birt.report.model.api.DesignElementHandle
`module`

Fields inherited from interface org.eclipse.birt.report.model.elements.interfaces.IDataSetModel
`CACHED_METADATA_PROP, COLUMN_HINTS_PROP, COMPUTED_COLUMNS_PROP, FILTER_PROP, NEEDS_CACHE_PROP, PARAMETERS_PROP, RESULT_SET_HINTS_PROP, RESULT_SET_PROP, ROW_FETCH_LIMIT_PROP`

Fields inherited from interface org.eclipse.birt.report.model.elements.interfaces.ISimpleDataSetModel
`AFTER_CLOSE_METHOD, AFTER_OPEN_METHOD, BEFORE_CLOSE_METHOD, BEFORE_OPEN_METHOD, CACHED_ROW_COUNT_PROP, DATA_SET_ROW_LIMIT, DATA_SOURCE_PROP, ON_FETCH_METHOD, PARAM_BINDINGS_PROP`

Fields inherited from interface org.eclipse.birt.report.model.elements.interfaces.IDesignElementModel
`COMMENTS_PROP, CUSTOM_XML_PROP, DISPLAY_NAME_ID_PROP, DISPLAY_NAME_PROP, EVENT_HANDLER_CLASS_PROP, EXTENDS_PROP, FULL_LABEL, ID_SUFFIX, NAME_PROP, NO_SLOT, PROPERTY_MASKS_PROP, REF_TEMPLATE_PARAMETER_PROP, SHORT_LABEL, USER_LABEL, USER_PROPERTIES_PROP, VIEW_ACTION_PROP`

Constructor Summary
`DataSetHandle(org.eclipse.birt.report.model.core.Module module, org.eclipse.birt.report.model.core.DesignElement element)` Constructs a data set handle with the given design and element.

Method Summary
`void` | `addFilter(FilterCondition fc)` Adds the filter condition.
`java.util.Iterator` | `columnHintsIterator()` Returns an iterator over column hints.
`java.util.Iterator` | `computedColumnsIterator()` Returns an iterator for the list of computed columns.
`java.util.Iterator` | `filtersIterator()` Returns an iterator over filter.
`java.lang.String` | `getAfterClose()` Returns the code of the afterClose method.
`java.lang.String` | `getAfterOpen()` Returns the code of the afterOpen method.
`java.lang.String` | `getBeforeClose()` Returns the code of the beforeClose method.
`java.lang.String` | `getBeforeOpen()` Returns the code of the beforeOpen method.
`CachedMetaDataHandle` | `getCachedMetaDataHandle()` Return a handle to deal with the cached data set information that include output column information when it gets from databases, input/output parameter definitions.
`int` | `getCachedRowCount()` Deprecated. by getDataSetRowLimit method
`int` | `getDataSetRowLimit()` Deprecated. duplicate with method getRowFetchLimit()
`DataSourceHandle` | `getDataSource()` Returns a handle to the data source for this data set.
`java.lang.String` | `getDataSourceName()` Returns the name of the data source for this data set.
`java.lang.String` | `getOnFetch()` Returns the code of the onFetch method.
`PropertyHandle` | `getPropertyHandle(java.lang.String propName)` Returns a property handle for a top-level property.
`int` | `getRowFetchLimit()` Returns the max number of rows from data set property value.
`boolean` | `needsCache()` Determines whether to do some cache when rendering the report.
`java.util.Iterator` | `paramBindingsIterator()` Returns an iterator over the list of parameter bindings.
`java.util.Iterator` | `parametersIterator()` Returns an iterator over the list of output parameter definitions.
`void` | `removeFilter(FilterCondition fc)` Removes the filter condition.
`java.util.Iterator` | `resultSetHintsIterator()` Returns an iterator over hints of the result set columns.
`java.util.Iterator` | `resultSetIterator()` Returns an iterator over the result set columns.
`void` | `setAfterClose(java.lang.String code)` Sets the code for the afterClose method.
`void` | `setAfterOpen(java.lang.String code)` Sets the code for the afterOpen method.
`void` | `setBeforeClose(java.lang.String code)` Sets the code for the beforeClose method.
`void` | `setBeforeOpen(java.lang.String code)` Sets the code for the beforeOpen method.
`CachedMetaDataHandle` | `setCachedMetaData(CachedMetaData metadata)` Set the value for the cached data set information.
`void` | `setCachedRowCount(int count)` Deprecated. by setDataSetRowLimit method
`void` | `setDataSetRowLimit(int count)` Deprecated. duplicate with method setRowFetchLimit()
`void` | `setDataSource(java.lang.String name)` Sets the name of the data source for this data set.
`void` | `setNeedsCache(boolean needsCache)` Sets whether to do some cache when rendering the report.
`void` | `setOnFetch(java.lang.String code)` Sets the code for the onFetch method.
`void` | `setRowFetchLimit(int count)` Sets the max number of rows from data set property value.

Methods inherited from class org.eclipse.birt.report.model.api.ReportElementHandle
`getComments, getCustomXml, getDisplayName, getDisplayNameKey, getElement, getPropertyMask, isValidLayoutForCompoundElement, isValidReferenceForCompoundElement, propertyMaskIterator, setComments, setCustomXml, setDisplayName, setDisplayNameKey, setPropertyMask`

Methods inherited from class org.eclipse.birt.report.model.api.DesignElementHandle
`add, add, addElement, addElement, addListener, addUserPropertyDefn, cachePropertyHandles, canContain, canContain, canContain, canContain, canDrop, canEdit, canTransformToTemplate, clearAllProperties, clearContents, clearProperty, clientsIterator, copy, copyPropertyTo, createTemplateElement, derivedIterator, doSort, drop, drop, drop, dropAndClear, dropAndClear, dropAndClear, dropUserPropertyDefn, findContentSlot, getBooleanProperty, getChoices, getColorProperty, getContainer, getContainerPropertyHandle, getContainerSlotHandle, getContent, getContentCount, getContents, getDefn, getDesign, getDesignHandle, getDimensionProperty, getDisplayLabel, getDisplayLabel, getDisplayProperty, getEffectiveModule, getElementFactory, getElementProperty, getEventHandlerClass, getExtends, getExternalizedValue, getExternalizedValue, getExternalizedValue, getFactoryPropertyHandle, getFloatProperty, getFontProperty, getFullName, getHostViewHandle, getID, getIndex, getIntProperty, getListProperty, getListProperty, getMethods, getModule, getModuleHandle, getName, getNumberProperty, getPrivateStyle, getProperty, getPropertyBinding, getPropertyBindings, getPropertyDefn, getPropertyIterator, getQualifiedName, getRoot, getSemanticErrors, getSlot, getStringProperty, getStyle, getUserProperties, getUserPropertyDefnHandle, getXPath, hasLocalProperties, hasSemanticError, initializeSlotHandles, isDirectionRTL, isTemplateParameterValue, isValid, localize, move, move, moveTo, moveTo, moveTo, moveTo, paste, paste, paste, paste, removeListener, revertToReportItem, revertToTemplate, semanticCheck, setEncryption, setEventHandlerClass, setExtends, setExtendsElement, setExtendsName, setFloatProperty, setIntProperty, setName, setNumberProperty, setProperties, setProperty, setPropertyBinding, setStringProperty, setStyle, setStyleElement, setStyleName, setValid, shift, showError`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DataSetHandle

    public DataSetHandle(org.eclipse.birt.report.model.core.Module module,
                         org.eclipse.birt.report.model.core.DesignElement element)

  Constructs a data set handle with the given design and element. The application generally does not create handles directly. Instead, it uses one of the navigation methods available on other element handles.

  Parameters:
    `module` - the module
    `element` - the model representation of the element

Method Detail

### getDataSource

    public DataSourceHandle getDataSource()

  Returns a handle to the data source for this data set.

  Returns:
    handle to the data source, or `null` if the data source is not set or is undefined.

### getDataSourceName

    public java.lang.String getDataSourceName()

  Returns the name of the data source for this data set.

  Returns:
    the data source name as a string
  See Also:
    `setDataSource(String)`

### setDataSource

    public void setDataSource(java.lang.String name)
                       throws SemanticException

  Sets the name of the data source for this data set. This method checks whether the data source name exists in the report design.

  Parameters:
    `name` - the data source name
  Throws:
    `SemanticException` - if the data source does not exist in the report design, or the property if locked.
  See Also:
    `getDataSource()`

### parametersIterator

    public java.util.Iterator parametersIterator()

  Returns an iterator over the list of output parameter definitions. The iterator returns instances of `DataSetParameterHandle` that represents parameter objects.

  Returns:
    iterator over output parameter definitions.
  See Also:
    `DataSetParameter`

### paramBindingsIterator

    public java.util.Iterator paramBindingsIterator()

  Returns an iterator over the list of parameter bindings. The iterator returns instances of `ParamBindingHandle` that represents parameter binding object.

  Returns:
    iterator over parameter binding.
  See Also:
    `ParamBinding`

### resultSetIterator

    public java.util.Iterator resultSetIterator()

  Returns an iterator over the result set columns. The iterator returns instances of `ResultSetColumnHandle` that represents result set column object.

  Returns:
    iterator over result set columns.
  See Also:
    `ResultSetColumn`

### resultSetHintsIterator

    public java.util.Iterator resultSetHintsIterator()

  Returns an iterator over hints of the result set columns. The iterator returns instances of `ResultSetColumnHandle` that represents hints of result set column object.

  Returns:
    iterator over hints of result set columns.
  See Also:
    `ResultSetColumn`

### computedColumnsIterator

    public java.util.Iterator computedColumnsIterator()

  Returns an iterator for the list of computed columns. The iterator returns instances of `ComputedColumnHandle` that represents computed column object.

  Returns:
    iterator over computed columns.
  See Also:
    `ComputedColumn`

### columnHintsIterator

    public java.util.Iterator columnHintsIterator()

  Returns an iterator over column hints. The iterator returns instances of `ColumnHintHandle` that represents column hint object.

  Returns:
    iterator over column hints.
  See Also:
    `ColumnHint`

### filtersIterator

    public java.util.Iterator filtersIterator()

  Returns an iterator over filter. The iterator returns instances of `FilterConditionHandle` that represents filter condition object.

  Returns:
    iterator over filters.
  See Also:
    `FilterCondition`

### getBeforeOpen

    public java.lang.String getBeforeOpen()

  Returns the code of the beforeOpen method. This is the script called just before opening this data set.

  Returns:
    the code of the method

### setBeforeOpen

    public void setBeforeOpen(java.lang.String code)
                       throws SemanticException

  Sets the code for the beforeOpen method. This is the script called just before opening this data set.

  Parameters:
    `code` - the code for the method
  Throws:
    `SemanticException` - If the method is locked.

### getBeforeClose

    public java.lang.String getBeforeClose()

  Returns the code of the beforeClose method. This is the script called just before closing this data set.

  Returns:
    the code of the method

### setBeforeClose

    public void setBeforeClose(java.lang.String code)
                        throws SemanticException

  Sets the code for the beforeClose method. This is the script called just before closing this data set.

  Parameters:
    `code` - the code for the method
  Throws:
    `SemanticException` - If the method is locked.

### getAfterOpen

    public java.lang.String getAfterOpen()

  Returns the code of the afterOpen method. This is the script called just after opening this data set.

  Returns:
    the code of the method

### setAfterOpen

    public void setAfterOpen(java.lang.String code)
                      throws SemanticException

  Sets the code for the afterOpen method. This is the script called just after opening this data set.

  Parameters:
    `code` - the code for the method
  Throws:
    `SemanticException` - If the method is locked.

### getAfterClose

    public java.lang.String getAfterClose()

  Returns the code of the afterClose method. This is the script called just after closing this data set.

  Returns:
    the code of the method

### setAfterClose

    public void setAfterClose(java.lang.String code)
                       throws SemanticException

  Sets the code for the afterClose method. This is the script called just after closing this data set.

  Parameters:
    `code` - the code for the method
  Throws:
    `SemanticException` - If the method is locked.

### getOnFetch

    public java.lang.String getOnFetch()

  Returns the code of the onFetch method. This is the script called just after fetching each row.

  Returns:
    the code of the method

### setOnFetch

    public void setOnFetch(java.lang.String code)
                    throws SemanticException

  Sets the code for the onFetch method. This is the script called just after fetching each row.

  Parameters:
    `code` - the code for the method
  Throws:
    `SemanticException` - If the method is locked.

### getCachedMetaDataHandle

    public CachedMetaDataHandle getCachedMetaDataHandle()

  Return a handle to deal with the cached data set information that include output column information when it gets from databases, input/output parameter definitions.

  Returns:
    a `CachedMetaDataHandle` to deal with the cached data set information, return `null` if the property has not been set.

### setCachedMetaData

    public CachedMetaDataHandle setCachedMetaData(CachedMetaData metadata)
                                           throws SemanticException

  Set the value for the cached data set information.

  Parameters:
    `metadata` - a structure value include output column information , input/output parameter definitions.
  Returns:
    `CachedMetaDataHandle` to the input `metadata`, return `null` if `metadata` is `null`.
  Throws:
    `SemanticException` - the input data is not valid.

### getPropertyHandle

    public PropertyHandle getPropertyHandle(java.lang.String propName)

  Description copied from class: `DesignElementHandle`
  Returns a property handle for a top-level property. A top-level property is a property that defines on an element.

  Overrides:
    `getPropertyHandle` in class `DesignElementHandle`
  Parameters:
    `propName` - the name of the property to get
  Returns:
    The property handle, or `null` if the no property exists with the given name.
  See Also:
    `PropertyHandle`

### setDataSetRowLimit

    public void setDataSetRowLimit(int count)
                            throws SemanticException

  Deprecated. duplicate with method setRowFetchLimit()

  Sets data set row limit property value.

  Parameters:
    `count` -
  Throws:
    `SemanticException`

### getDataSetRowLimit

    public int getDataSetRowLimit()

  Deprecated. duplicate with method getRowFetchLimit()

  Returns value of data set row limit property.

  Returns:

### setCachedRowCount

    public void setCachedRowCount(int count)
                           throws SemanticException

  Deprecated. by setDataSetRowLimit method

  sets the cached row count property value.

  Parameters:
    `count` - the cached row count
  Throws:
    `SemanticException`

### getCachedRowCount

    public int getCachedRowCount()

  Deprecated. by getDataSetRowLimit method

  Returns the value of cached row count property.

  Returns:
    the row count.

### setRowFetchLimit

    public void setRowFetchLimit(int count)
                          throws SemanticException

  Sets the max number of rows from data set property value.

  Parameters:
    `count` - the row number to fetch from result set
  Throws:
    `SemanticException`

### getRowFetchLimit

    public int getRowFetchLimit()

  Returns the max number of rows from data set property value.

  Returns:
    the max number of rows that can be fetched from data set.

### addFilter

    public void addFilter(FilterCondition fc)
                   throws SemanticException

  Adds the filter condition.

  Parameters:
    `fc` - the filter condition structure
  Throws:
    `SemanticException` - if the expression of filter condition is empty or null

### removeFilter

    public void removeFilter(FilterCondition fc)
                      throws SemanticException

  Removes the filter condition.

  Parameters:
    `fc` - the filter condition structure
  Throws:
    `SemanticException` - if the given condition doesn't exist in the filters

### setNeedsCache

    public void setNeedsCache(boolean needsCache)
                       throws SemanticException

  Sets whether to do some cache when rendering the report.

  Parameters:
    `needsCache` - true if needs do caching when rendering the report, otherwise false
  Throws:
    `SemanticException`

### needsCache

    public boolean needsCache()

  Determines whether to do some cache when rendering the report.

  Returns:
    true if needs do caching when rendering the report, otherwise false

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