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.

Version:

$Revision: 1.111 $ $Date: 2005/12/23 01:32:25 $

Field Summary

protected AxionQueryContext	_context
protected Database	_currentDatabase
protected AxionQueryPlanner	_planner

Constructor Summary

SelectCommand(AxionQueryContext context)

Method Summary

protected void	buildBindVariables()
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.
AxionResultSet	executeQuery(Database db, boolean isReadOnly) Execute an SQL statement that returns a single ResultSet object with the given read-only state.
int	executeUpdate(Database database) Unsupported
java.util.Map	getColumnIdToFieldMap()
AxionQueryContext	getQueryContext()
RowIterator	makeRowIterator(Database db, boolean isReadOnly)
RowIterator	makeRowIterator(Database db, boolean isReadOnly, boolean refresh)
protected void	resolve(Database db)
java.lang.String	toString()

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

assertNotReadOnly, attemptToConvertValue, bindAll, clearBindings, createResolveSelectableVisitor, getBindVariableIterator, getBindVariableIterator, getBindVariables, getBindVariableVisitor, getColIdentifierList, getCommitSize, getEffectedRowCount, getResultSet, getRowIterator, makeRowDecorator, populateDefaultValues, populateSequenceColumns, resolveGeneratedColumns, resolveGeneratedColumns, resolveSelectable, resolveSelectable, resolveSelectableList, resolveSelectableList, setBindVariableVisitor, setDeferAllConstraintIfRequired, setEffectedRowCount, setResultSet, updateGeneratedValues

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()

executeQuery

public AxionResultSet executeQuery(Database db,
                                   boolean isReadOnly)
                            throws AxionException

Description copied from interface: AxionCommand

Execute an SQL statement that returns a single ResultSet object with the given read-only state.

Specified by:

executeQuery in interface AxionCommand

Overrides:

executeQuery in class BaseAxionCommand

Parameters:

db - Database in which query will be executed

isReadOnly - true if statement is read-only, false otherwise

Returns:

the generated ResultSet

Throws:

AxionException

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 java.util.Map getColumnIdToFieldMap()

getQueryContext

public AxionQueryContext getQueryContext()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

buildTableList

protected void buildTableList(Database db)
                       throws AxionException

Throws:

AxionException

buildBindVariables

protected void buildBindVariables()

Overrides:

buildBindVariables in class BaseAxionCommand

makeRowIterator

public RowIterator makeRowIterator(Database db,
                                   boolean isReadOnly)
                            throws AxionException

Throws:

AxionException

makeRowIterator

public RowIterator makeRowIterator(Database db,
                                   boolean isReadOnly,
                                   boolean refresh)
                            throws AxionException

Throws:

AxionException

resolve

protected void resolve(Database db)
                throws AxionException

Throws:

AxionException