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## org.eclipse.birt.data.engine.api.querydefn
Class QueryDefinition

    java.lang.Object
      org.eclipse.birt.data.engine.api.querydefn.BaseTransform
          org.eclipse.birt.data.engine.api.querydefn.BaseQueryDefinition
              org.eclipse.birt.data.engine.api.querydefn.QueryDefinition

All Implemented Interfaces:
  IBaseQueryDefinition, IBaseTransform, IDataQueryDefinition, INamedObject, IQueryDefinition

    public class QueryDefinition

extends BaseQueryDefinition
implements IQueryDefinition

Default implementation of the `IQueryDefinition` interface

Field Summary
`protected java.util.List` | `bindings`
`protected java.lang.String` | `dataSetName`
`protected java.lang.String[]` | `projectedColumns`

Fields inherited from class org.eclipse.birt.data.engine.api.querydefn.BaseQueryDefinition
`distinctValue, groups, hasDetail, maxRowCount, parentQuery, startingRow`

Fields inherited from class org.eclipse.birt.data.engine.api.querydefn.BaseTransform
`AFTER_LAST_ROW, afterExpressions, BEFORE_FIRST_ROW, beforeExpressions, filters, ON_EACH_ROW, rowExpressions, sorts, subqueries`

Constructor Summary
`QueryDefinition()` Constructs an empty query definition
`QueryDefinition(BaseQueryDefinition parent)` Constructs a query that is nested within another query.

Method Summary
`void` | `addInputParamBinding(InputParameterBinding binding)` Adds an input parameter binding to this report query.
`java.lang.String[]` | `getColumnProjection()` Provides a column projection hint to the data engine.
`java.lang.String` | `getDataSetName()` Gets the name of the data set used by this query
`java.util.Collection` | `getInputParamBindings()` Returns the set of input parameter bindings as an unordered collection of `InputParameterBinding` objects.
`java.lang.String` | `getQueryResultsID()` When this value is not null, the data set name will not be used, since it indicates query is running on the data of report document or local caching of QueryResults.
`IBaseQueryDefinition` | `getSourceQuery()` Return the source query of current query.
`boolean` | `needAutoBinding()` When user knows which columns are in data set and user likes to get the column value without explicitly binding a name to a data set row expression, this flag can be set as true to indicate it.
`void` | `setAutoBinding(boolean autoBinding)`
`void` | `setColumnProjection(java.lang.String[] projectedColumns)` Provides a column projection hint to the data engine.
`void` | `setDataSetName(java.lang.String dataSetName)`
`void` | `setQueryResultsID(java.lang.String queryResultsID)`
`void` | `setSourceQuery(IBaseQueryDefinition sourceQuery)`

Methods inherited from class org.eclipse.birt.data.engine.api.querydefn.BaseQueryDefinition
`addBinding, addGroup, addResultSetExpression, cacheQueryResults, getBindings, getDistinctValue, getGroups, getMaxRows, getName, getParentQuery, getQueryExecutionHints, getResultSetExpressions, getStartingRow, setCacheQueryResults, setDistinctValue, setMaxRows, setName, setQueryExecutionHints, setStartingRow, setUsesDetails, usesDetails`

Methods inherited from class org.eclipse.birt.data.engine.api.querydefn.BaseTransform
`addFilter, addSort, addSubquery, getFilters, getSorts, getSubqueries`

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

Methods inherited from interface org.eclipse.birt.data.engine.api.IBaseQueryDefinition
`addBinding, cacheQueryResults, getBindings, getDistinctValue, getGroups, getMaxRows, getParentQuery, getQueryExecutionHints, getResultSetExpressions, getStartingRow, setMaxRows, usesDetails`

Methods inherited from interface org.eclipse.birt.data.engine.api.IBaseTransform
`getFilters, getSorts, getSubqueries`

Methods inherited from interface org.eclipse.birt.data.engine.api.INamedObject
`getName, setName`

Field Detail

### dataSetName

    protected java.lang.String dataSetName

### bindings

    protected java.util.List bindings

### projectedColumns

    protected java.lang.String[] projectedColumns

Constructor Detail

### QueryDefinition

    public QueryDefinition()

  Constructs an empty query definition

### QueryDefinition

    public QueryDefinition(BaseQueryDefinition parent)

  Constructs a query that is nested within another query. The outer query (parent) can be another query, or a sub query.

  Parameters:
    `parent` - The outer query or subquery

Method Detail

### getDataSetName

    public java.lang.String getDataSetName()

  Gets the name of the data set used by this query

  Specified by:
    `getDataSetName` in interface `IQueryDefinition`

### setDataSetName

    public void setDataSetName(java.lang.String dataSetName)

  Parameters:
    `dataSetName` - Name of data set used by this query.

### needAutoBinding

    public boolean needAutoBinding()

  Description copied from interface: `IQueryDefinition`
  When user knows which columns are in data set and user likes to get the column value without explicitly binding a name to a data set row expression, this flag can be set as true to indicate it. For example, there is one column, COUNTRY. When this flag is false, if user wants to get the value of COUNTRY, user first needs to add a binding like , and then user can get the value by the name of COUNTRY. But if this flag is set, user does not need to add the binding, and then user can get the value directly. Currently only when there is data set defined, this flag will have effect.

  Specified by:
    `needAutoBinding` in interface `IQueryDefinition`
  Returns:
    true, auto binding needs to be supported. false, auto binding is not supported, this is default behavior.

### setAutoBinding

    public void setAutoBinding(boolean autoBinding)

  Parameters:
    `autoBinding` -

### getQueryResultsID

    public java.lang.String getQueryResultsID()

  Description copied from interface: `IQueryDefinition`
  When this value is not null, the data set name will not be used, since it indicates query is running on the data of report document or local caching of QueryResults.

  Specified by:
    `getQueryResultsID` in interface `IQueryDefinition`
  Returns:
    associated queryResultID in query on report document/local caching

### setQueryResultsID

    public void setQueryResultsID(java.lang.String queryResultsID)

  Parameters:
    `queryResultID` -

### getInputParamBindings

    public java.util.Collection getInputParamBindings()

  Returns the set of input parameter bindings as an unordered collection of `InputParameterBinding` objects.

  Specified by:
    `getInputParamBindings` in interface `IQueryDefinition`
  Returns:
    the input parameter bindings. If no binding is defined, null is returned.

### addInputParamBinding

    public void addInputParamBinding(InputParameterBinding binding)

  Adds an input parameter binding to this report query.

  Parameters:
    `binding` - The bindings to set.

### setColumnProjection

    public void setColumnProjection(java.lang.String[] projectedColumns)

  Provides a column projection hint to the data engine. The caller informs the data engine that only a selected list of columns defined by the data set are used by this report query. The names of those columns (the "projected columns") are passed in as an array of string.
  If a column projection is set, runtime error may occur if the report query uses columns that are not defined in the projected column list.

### getColumnProjection

    public java.lang.String[] getColumnProjection()

  Description copied from interface: `IQueryDefinition`
  Provides a column projection hint to the data engine. The caller informs the data engine that only a selected list of columns defined by the data set are used by this report query. The names of those columns (the "projected columns") are passed in as an array of string.
  If a column projection is set, runtime error may occur if the report query uses columns that are not defined in the projected column list.

  Specified by:
    `getColumnProjection` in interface `IQueryDefinition`
  See Also:
    `IQueryDefinition.getColumnProjection()`

### getSourceQuery

    public IBaseQueryDefinition getSourceQuery()

  Description copied from interface: `IQueryDefinition`
  Return the source query of current query. If source query is provided, the execution result of it will be treated as the "data source" of current query definition. That is, the current query will be executed against the query results, rather then "data source/data set" settings.

  Specified by:
    `getSourceQuery` in interface `IQueryDefinition`
  Returns:

### setSourceQuery

    public void setSourceQuery(IBaseQueryDefinition sourceQuery)

  Parameters:
    `sourceQuery` -

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