org.axiondb.engine.commands
Class CheckFileStateCommand

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

All Implemented Interfaces:

AxionCommand

public class CheckFileStateCommand
extends BaseAxionCommand

A CHECKFILESTATE query. Generates a non-empty ResultSet if the database's files are accessible, an empty one otherwise.

Version:

$Revision: 1.18 $ $Date: 2005/05/02 22:24:33 $

Constructor Summary

CheckFileStateCommand()

Method Summary

AxionResultSet	createFailureResultSet()
AxionResultSet	createSuccessResultSet()
boolean	execute(Database db) Executes an SQL statement that may return multiple results.
AxionResultSet	executeQuery(Database db) Executes an SQL statement that returns a single read-only ResultSet object such as a SELECT statement.
int	executeUpdate(Database database) Executes an SQL that may add, delete or modify zero or more rows within the database, such as an INSERT, UPDATE or DELETE statement.
java.lang.String	toString()

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

assertNotReadOnly, attemptToConvertValue, bindAll, buildBindVariables, clearBindings, createResolveSelectableVisitor, executeQuery, 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

Constructor Detail

CheckFileStateCommand

public CheckFileStateCommand()

Method Detail

execute

public boolean execute(Database db)
                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

Description copied from interface: AxionCommand

Executes an SQL statement that returns a single read-only ResultSet object such as a SELECT statement.

Returns:

the generated ResultSet

Throws:

AxionException

See Also:

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

createSuccessResultSet

public AxionResultSet createSuccessResultSet()

createFailureResultSet

public AxionResultSet createFailureResultSet()

executeUpdate

public int executeUpdate(Database database)
                  throws AxionException

Description copied from interface: AxionCommand

Executes an SQL that may add, delete or modify zero or more rows within the database, such as an INSERT, UPDATE or DELETE statement. In addition, SQL statements that return nothing, such as SQL DDL statements, can be executed via this method.

Returns:

the number of rows modified

Throws:

AxionException

See Also:

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

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object