org.axiondb.engine.commands
Class SubSelectCommand

java.lang.Object
  org.axiondb.engine.commands.BaseAxionCommand
      org.axiondb.engine.commands.SelectCommand
          org.axiondb.engine.commands.SubSelectCommand

All Implemented Interfaces:

AxionCommand, Selectable, Serializable

public class SubSelectCommand

extends SelectCommand

implements Selectable

A Sub SELECT query used for view, scalar value, from node, row list

Version:

$Revision: 1.6 $ $Date: 2004/09/09 23:47:43 $

See Also:

Serialized Form

Field Summary

Fields inherited from class org.axiondb.engine.commands.SelectCommand

_context, _currentDatabase, _planner

Constructor Summary

SubSelectCommand(AxionQueryContext context)

Method Summary

protected void	buildTableList(Database db)
Object	evaluate(RowDecorator row)
boolean	execute(Database database) Executes an SQL statement that may return multiple results.
AxionResultSet	executeQuery(Database db) Execute this command, returning a ResultSet.
int	executeUpdate(Database database) Unsupported
String	getAlias()
DataType	getDataType()
String	getLabel()
String	getName()
RowIterator	getRowIterator(Database db) Return RowIterator that can used for other commands for sub-query.
RowIterator	getRowIterator(Database db, RowDecorator rowDec)
Table	getTableView(Database db, String name) Return TableView a table wrapper to hold sub-query RowIterator.
Table	getUpdatableTableView(Database db)
Table	getUpdatableTableView(Database db, String name)
boolean	isScalarSelect()
RowIterator	makeRowIterator(Database db)
void	setAlias(String aliasName)
void	setDB(Database db)
void	setEvaluteAsScalarValue()
void	setParentTables(TableIdentifier[] tables)
void	setVariableContext(VariableContext context)

Methods inherited from class org.axiondb.engine.commands.SelectCommand

getBindVariableIterator, getColumnIdToFieldMap, getQueryContext, makeRowIterator, resolve, toString

Methods inherited from class org.axiondb.engine.commands.BaseAxionCommand

appendBindVariables, assertNotReadOnly, attemptToConvertValue, bind, clearBindings, getEffectedRowCount, getResultSet, getRowIterator, getRowIterator, getTableForIdentifier, resolveSelectableList, resolveSelectableList, setEffectedRowCount, setResultSet

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SubSelectCommand

public SubSelectCommand(AxionQueryContext context)

Method Detail

evaluate

public Object evaluate(RowDecorator row)
                throws AxionException

Specified by:

evaluate in interface Selectable

Throws:

AxionException

execute

public boolean execute(Database database)
                throws AxionException

Description copied from interface: AxionCommand

Executes an SQL statement that may return multiple results.

Specified by:

execute in interface AxionCommand

Overrides:

execute in class SelectCommand

Throws:

AxionException

executeQuery

public AxionResultSet executeQuery(Database db)
                            throws AxionException

Description copied from class: SelectCommand

Execute this command, returning a ResultSet.

Specified by:

executeQuery in interface AxionCommand

Overrides:

executeQuery in class SelectCommand

Returns:

the ResultSetgenerated by this command.

Throws:

AxionException

executeUpdate

public int executeUpdate(Database database)
                  throws AxionException

Description copied from class: SelectCommand

Unsupported

Specified by:

executeUpdate in interface AxionCommand

Overrides:

executeUpdate in class SelectCommand

Throws:

AxionException

getAlias

public String getAlias()

Specified by:

getAlias in interface Selectable

getDataType

public DataType getDataType()

Specified by:

getDataType in interface Selectable

getLabel

public String getLabel()

Specified by:

getLabel in interface Selectable

getName

public String getName()

Specified by:

getName in interface Selectable

getRowIterator

public RowIterator getRowIterator(Database db)
                           throws AxionException

Return RowIterator that can used for other commands for sub-query.

Returns:

the RowIterator.

Throws:

AxionException

getRowIterator

public RowIterator getRowIterator(Database db,
                                  RowDecorator rowDec)
                           throws AxionException

Throws:

AxionException

getTableView

public Table getTableView(Database db,
                          String name)
                   throws AxionException

Return TableView a table wrapper to hold sub-query RowIterator.

Returns:

the TableView.

Throws:

AxionException

getUpdatableTableView

public Table getUpdatableTableView(Database db)
                            throws AxionException

Throws:

AxionException

getUpdatableTableView

public Table getUpdatableTableView(Database db,
                                   String name)
                            throws AxionException

Throws:

AxionException

isScalarSelect

public boolean isScalarSelect()

makeRowIterator

public RowIterator makeRowIterator(Database db)
                            throws AxionException

Overrides:

makeRowIterator in class SelectCommand

Throws:

AxionException

setAlias

public void setAlias(String aliasName)

setDB

public void setDB(Database db)

setEvaluteAsScalarValue

public void setEvaluteAsScalarValue()

setParentTables

public void setParentTables(TableIdentifier[] tables)

setVariableContext

public void setVariableContext(VariableContext context)

Specified by:

setVariableContext in interface Selectable

buildTableList

protected void buildTableList(Database db)
                       throws AxionException

Overrides:

buildTableList in class SelectCommand

Throws:

AxionException