org.exolab.castor.jdo.engine

Class SimpleQueryExecutor.SimpleQueryResults

java.lang.Object

org.exolab.castor.jdo.engine.SimpleQueryExecutor.SimpleQueryResults

All Implemented Interfaces:

Enumeration<Object>, QueryResults

Enclosing class:

SimpleQueryExecutor

public class SimpleQueryExecutor.SimpleQueryResults
extends Object
implements QueryResults

Constructor Summary

Constructors

Constructor and Description
SimpleQueryResults()

Method Summary

Modifier and Type	Method and Description
boolean	absolute(int row) use the jdbc 2.0 method to move to an absolute position in the resultset.
void	close() Closes the result set and releases all resources held by it.
protected void	finalize()
boolean	hasMore() Returns true if there are any more results in the result set.
boolean	hasMoreElements()
Object	next() Returns the next result in the result set.
Object	nextElement()
int	size() Uses the underlying db's cursors to most to the last row in the result set, get the row number via getRow(), then move back to where ever the user was positioned in the resultset.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleQueryResults

public SimpleQueryResults()

Method Detail

absolute

public boolean absolute(int row)
                 throws PersistenceException

use the jdbc 2.0 method to move to an absolute position in the resultset.

Specified by:

absolute in interface QueryResults

Parameters:

row - The row to move to

Returns:

???

Throws:

PersistenceException - A persistence error occured

size

public int size()
         throws PersistenceException

Uses the underlying db's cursors to most to the last row in the result set, get the row number via getRow(), then move back to where ever the user was positioned in the resultset.

Specified by:

size in interface QueryResults

Returns:

Size of the resulting result set.

Throws:

PersistenceException - A persistence error occured

hasMoreElements

public boolean hasMoreElements()

Specified by:

hasMoreElements in interface Enumeration<Object>

hasMore

public boolean hasMore()
                throws PersistenceException

Description copied from interface: QueryResults

Returns true if there are any more results in the result set. If an error occured reading the last result, an exception will be thrown and the result set cannot be used further.

Specified by:

hasMore in interface QueryResults

Returns:

True if there are any more results in the result set

Throws:

PersistenceException - An error with the persistence engine

nextElement

public Object nextElement()
                   throws NoSuchElementException

Specified by:

nextElement in interface Enumeration<Object>

Throws:

NoSuchElementException

next

public Object next()
            throws PersistenceException,
                   NoSuchElementException

Description copied from interface: QueryResults

Returns the next result in the result set. If there are no more results (a previous cal to QueryResults.hasMore() returns false) this method will throw an exceptin. If an error occured reading the last result, an exception will be thrown and the result set cannot be used further.

Specified by:

next in interface QueryResults

Returns:

The next result in the result set

Throws:

PersistenceException - An error with the persistence engine

NoSuchElementException - There are no more results in the result set

close

public void close()

Description copied from interface: QueryResults

Closes the result set and releases all resources held by it.

Specified by:

close in interface QueryResults

finalize

protected void finalize()
                 throws Throwable

Overrides:

finalize in class Object

Throws:

Throwable