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org.apache.commons.dbcp

Class PoolingConnection

Implemented Interfaces:
Connection, KeyedPoolableObjectFactory
public class PoolingConnection
extends DelegatingConnection
implements Connection, KeyedPoolableObjectFactory
A DelegatingConnection that pools PreparedStatements.

My prepareStatement methods, rather than creating a new PreparedStatement each time, may actually pull the PreparedStatement from a pool of unused statements. The PreparedStatement.close method of the returned PreparedStatement doesn't actually close the statement, but rather returns it to my pool. (See PoolablePreparedStatement.)

Version:
$Revision: 498524 $ $Date: 2007-01-21 21:44:45 -0700 (Sun, 21 Jan 2007) $
Authors:
Rodney Waldhoff
Dirk Verbeeck
See Also:
PoolablePreparedStatement

Constructor Summary

PoolingConnection(Connection c)
Constructor.
PoolingConnection(Connection c, KeyedObjectPool pool)
Constructor.

Method Summary

void
activateObject(Object key, Object obj)
My KeyedPoolableObjectFactory method for activating PreparedStatements.
void
close()
Close and free all PreparedStatements from my pool, and close my underlying connection.
void
destroyObject(Object key, Object obj)
My KeyedPoolableObjectFactory method for destroying PreparedStatements.
Object
makeObject(Object obj)
My KeyedPoolableObjectFactory method for creating PreparedStatements.
void
passivateObject(Object key, Object obj)
My KeyedPoolableObjectFactory method for passivating PreparedStatements.
PreparedStatement
prepareStatement(String sql)
Create or obtain a PreparedStatement from my pool.
PreparedStatement
prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
Create or obtain a PreparedStatement from my pool.
String
toString()
boolean
validateObject(Object key, Object obj)
My KeyedPoolableObjectFactory method for validating PreparedStatements.

Methods inherited from class org.apache.commons.dbcp.DelegatingConnection

clearWarnings, close, commit, createStatement, createStatement, createStatement, equals, getAutoCommit, getCatalog, getDelegate, getHoldability, getInnermostDelegate, getMetaData, getTransactionIsolation, getTypeMap, getWarnings, hashCode, innermostDelegateEquals, isClosed, isReadOnly, nativeSQL, prepareCall, prepareCall, prepareCall, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, releaseSavepoint, rollback, rollback, setAutoCommit, setCatalog, setDelegate, setHoldability, setReadOnly, setSavepoint, setSavepoint, setTransactionIsolation, setTypeMap, toString

Methods inherited from class org.apache.commons.dbcp.AbandonedTrace

printStackTrace

Constructor Details

PoolingConnection

public PoolingConnection(Connection c)
Constructor.
Parameters:
c - the underlying Connection.

PoolingConnection

public PoolingConnection(Connection c,
                         KeyedObjectPool pool)
Constructor.
Parameters:
c - the underlying Connection.
pool - KeyedObjectPool of PreparedStatements

Method Details

activateObject

public void activateObject(Object key,
                           Object obj)
            throws Exception
My KeyedPoolableObjectFactory method for activating PreparedStatements. (Currently a no-op.)
Parameters:
key - ignored
obj - ignored

close

public void close()
            throws SQLException
Close and free all PreparedStatements from my pool, and close my underlying connection.
Overrides:
close in interface DelegatingConnection

destroyObject

public void destroyObject(Object key,
                          Object obj)
            throws Exception
My KeyedPoolableObjectFactory method for destroying PreparedStatements.
Parameters:
key - ignored
obj - the PreparedStatement to be destroyed.

makeObject

public Object makeObject(Object obj)
            throws Exception
My KeyedPoolableObjectFactory method for creating PreparedStatements.
Parameters:
obj - the key for the PreparedStatement to be created

passivateObject

public void passivateObject(Object key,
                            Object obj)
            throws Exception
My KeyedPoolableObjectFactory method for passivating PreparedStatements. Currently invokes PreparedStatement.clearParameters.
Parameters:
key - ignored
obj - a PreparedStatement

prepareStatement

public PreparedStatement prepareStatement(String sql)
            throws SQLException
Create or obtain a PreparedStatement from my pool.
Overrides:
prepareStatement in interface DelegatingConnection
Returns:
a PoolablePreparedStatement

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          int resultSetType,
                                          int resultSetConcurrency)
            throws SQLException
Create or obtain a PreparedStatement from my pool.
Overrides:
prepareStatement in interface DelegatingConnection
Returns:
a PoolablePreparedStatement

toString

public String toString()
Overrides:
toString in interface DelegatingConnection

validateObject

public boolean validateObject(Object key,
                              Object obj)
My KeyedPoolableObjectFactory method for validating PreparedStatements.
Parameters:
key - ignored
obj - ignored
Returns:
true

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Copyright © 2001-2004 Apache Software Foundation. Documenation generated June 19 2007.