org.axiondb.engine.commands
Class SelectCommand

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

All Implemented Interfaces:

AxionCommand

Direct Known Subclasses:

SubSelectCommand

public class SelectCommand

extends BaseAxionCommand

A SELECT query.

TODO: Support for GROUP BY ...HAVING

Version:

$Revision: 1.91 $ $Date: 2004/09/09 23:47:43 $

Field Summary

protected AxionQueryContext	_context
protected Database	_currentDatabase
protected AxionQueryPlanner	_planner

Constructor Summary

SelectCommand(AxionQueryContext context)

Method Summary

protected void	buildTableList(Database db)
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
protected Iterator	getBindVariableIterator() Returns an Iteratorover all my BindVariables, in the proper order.
Map	getColumnIdToFieldMap()
AxionQueryContext	getQueryContext()
RowIterator	makeRowIterator(Database db)
protected RowIterator	makeRowIterator(Database db, boolean refresh)
protected void	resolve(Database db)
String	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

Field Detail

_context

protected AxionQueryContext _context

_currentDatabase

protected Database _currentDatabase

_planner

protected AxionQueryPlanner _planner

Constructor Detail

SelectCommand

public SelectCommand(AxionQueryContext context)

Method Detail

execute

public boolean execute(Database database)
                throws AxionException

Description copied from interface: AxionCommand

Executes an SQL statement that may return multiple results.

Returns:

true if one or more ResultSets were generated, false otherwise

Throws:

AxionException

See Also:

Statement.execute(java.lang.String), PreparedStatement.execute()

executeQuery

public AxionResultSet executeQuery(Database db)
                            throws AxionException

Execute this command, returning a ResultSet.

Returns:

the ResultSetgenerated by this command.

Throws:

AxionException

See Also:

Statement.executeQuery(java.lang.String), PreparedStatement.executeQuery()

executeUpdate

public int executeUpdate(Database database)
                  throws AxionException

Unsupported

Returns:

the number of rows modified

Throws:

AxionException

See Also:

Statement.executeUpdate(java.lang.String), PreparedStatement.executeUpdate()

getColumnIdToFieldMap

public Map getColumnIdToFieldMap()

getQueryContext

public AxionQueryContext getQueryContext()

makeRowIterator

public RowIterator makeRowIterator(Database db)
                            throws AxionException

Throws:

AxionException

toString

public String toString()

buildTableList

protected void buildTableList(Database db)
                       throws AxionException

Throws:

AxionException

getBindVariableIterator

protected Iterator getBindVariableIterator()

Description copied from class: BaseAxionCommand

Returns an Iteratorover all my BindVariables, in the proper order. Default impl returns empty iterator.

Overrides:

getBindVariableIterator in class BaseAxionCommand

makeRowIterator

protected RowIterator makeRowIterator(Database db,
                                      boolean refresh)
                               throws AxionException

Throws:

AxionException

resolve

protected void resolve(Database db)
                throws AxionException

Throws:

AxionException