org.apache.commons.dbcp
Class PoolingConnection

java.lang.Object
  org.apache.commons.dbcp.AbandonedTrace
      org.apache.commons.dbcp.DelegatingConnection
          org.apache.commons.dbcp.PoolingConnection

All Implemented Interfaces:

java.sql.Connection, java.sql.Wrapper, org.apache.commons.pool.KeyedPoolableObjectFactory

public class PoolingConnection
extends DelegatingConnection
implements java.sql.Connection, org.apache.commons.pool.KeyedPoolableObjectFactory

A DelegatingConnection that pools PreparedStatements.

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

Version:

$Revision: 885261 $ $Date: 2009-11-29 15:07:02 -0500 (Sun, 29 Nov 2009) $

Author:

Rodney Waldhoff, Dirk Verbeeck

See Also:

PoolablePreparedStatement

Field Summary

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Constructor Summary

PoolingConnection(java.sql.Connection c)
Constructor.

PoolingConnection(java.sql.Connection c, org.apache.commons.pool.KeyedObjectPool pool)
Constructor.

Method Summary

void	activateObject(java.lang.Object key, java.lang.Object obj) KeyedPoolableObjectFactory method for activating pooled statements.
void	close() Close and free all PreparedStatements or CallableStatement from the pool, and close the underlying connection.
void	destroyObject(java.lang.Object key, java.lang.Object obj) KeyedPoolableObjectFactory method for destroying PoolablePreparedStatements and PoolableCallableStatements.
java.lang.Object	makeObject(java.lang.Object obj) KeyedPoolableObjectFactory method for creating PoolablePreparedStatements or PoolableCallableStatements.
void	passivateObject(java.lang.Object key, java.lang.Object obj) KeyedPoolableObjectFactory method for passivating PreparedStatements or CallableStatements.
java.sql.CallableStatement	prepareCall(java.lang.String sql) Create or obtain a CallableStatement from the pool.
java.sql.CallableStatement	prepareCall(java.lang.String sql, int resultSetType, int resultSetConcurrency) Create or obtain a CallableStatement from the pool.
java.sql.PreparedStatement	prepareStatement(java.lang.String sql) Create or obtain a PreparedStatement from the pool.
java.sql.PreparedStatement	prepareStatement(java.lang.String sql, int resultSetType, int resultSetConcurrency) Create or obtain a PreparedStatement from the pool.
java.lang.String	toString() Returns a string representation of the metadata associated with the innnermost delegate connection.
boolean	validateObject(java.lang.Object key, java.lang.Object obj) KeyedPoolableObjectFactory method for validating pooled statements.

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

clearWarnings, commit, createArrayOf, createBlob, createClob, createNClob, createSQLXML, createStatement, createStatement, createStatement, createStruct, equals, getAutoCommit, getCatalog, getClientInfo, getClientInfo, getDelegate, getHoldability, getInnermostDelegate, getMetaData, getTransactionIsolation, getTypeMap, getWarnings, hashCode, innermostDelegateEquals, isClosed, isReadOnly, isValid, isWrapperFor, nativeSQL, prepareCall, prepareStatement, prepareStatement, prepareStatement, prepareStatement, releaseSavepoint, rollback, rollback, setAutoCommit, setCatalog, setClientInfo, setClientInfo, setDelegate, setHoldability, setReadOnly, setSavepoint, setSavepoint, setTransactionIsolation, setTypeMap, unwrap

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

printStackTrace

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.sql.Connection

clearWarnings, commit, createArrayOf, createBlob, createClob, createNClob, createSQLXML, createStatement, createStatement, createStatement, createStruct, getAutoCommit, getCatalog, getClientInfo, getClientInfo, getHoldability, getMetaData, getTransactionIsolation, getTypeMap, getWarnings, isClosed, isReadOnly, isValid, nativeSQL, prepareCall, prepareStatement, prepareStatement, prepareStatement, prepareStatement, releaseSavepoint, rollback, rollback, setAutoCommit, setCatalog, setClientInfo, setClientInfo, setHoldability, setReadOnly, setSavepoint, setSavepoint, setTransactionIsolation, setTypeMap

Methods inherited from interface java.sql.Wrapper

isWrapperFor, unwrap

Constructor Detail

PoolingConnection

public PoolingConnection(java.sql.Connection c)

Constructor.

Parameters:

c - the underlying Connection.

PoolingConnection

public PoolingConnection(java.sql.Connection c,
                         org.apache.commons.pool.KeyedObjectPool pool)

Constructor.

Parameters:

c - the underlying Connection.

pool - KeyedObjectPool of PreparedStatements and CallableStatements.

Method Detail

activateObject

public void activateObject(java.lang.Object key,
                           java.lang.Object obj)
                    throws java.lang.Exception

KeyedPoolableObjectFactory method for activating pooled statements.

Specified by:

activateObject in interface org.apache.commons.pool.KeyedPoolableObjectFactory

Parameters:

key - ignored

obj - pooled statement to be activated

Throws:

java.lang.Exception

close

public void close()
           throws java.sql.SQLException

Close and free all PreparedStatements or CallableStatement from the pool, and close the underlying connection.

Specified by:

close in interface java.sql.Connection

Overrides:

close in class DelegatingConnection

Throws:

java.sql.SQLException

destroyObject

public void destroyObject(java.lang.Object key,
                          java.lang.Object obj)
                   throws java.lang.Exception

KeyedPoolableObjectFactory method for destroying PoolablePreparedStatements and PoolableCallableStatements. Closes the underlying statement.

Specified by:

destroyObject in interface org.apache.commons.pool.KeyedPoolableObjectFactory

Parameters:

key - ignored

obj - the pooled statement to be destroyed.

Throws:

java.lang.Exception

makeObject

public java.lang.Object makeObject(java.lang.Object obj)
                            throws java.lang.Exception

KeyedPoolableObjectFactory method for creating PoolablePreparedStatements or PoolableCallableStatements. The stmtType field in the key determines whether a PoolablePreparedStatement or PoolableCallableStatement is created.

Specified by:

makeObject in interface org.apache.commons.pool.KeyedPoolableObjectFactory

Parameters:

obj - the key for the PreparedStatement to be created

Throws:

java.lang.Exception

See Also:

createKey(String, int, int, byte)

passivateObject

public void passivateObject(java.lang.Object key,
                            java.lang.Object obj)
                     throws java.lang.Exception

KeyedPoolableObjectFactory method for passivating PreparedStatements or CallableStatements. Invokes PreparedStatement.clearParameters().

Specified by:

passivateObject in interface org.apache.commons.pool.KeyedPoolableObjectFactory

Parameters:

key - ignored

obj - a PreparedStatement

Throws:

java.lang.Exception

prepareCall

public java.sql.CallableStatement prepareCall(java.lang.String sql)
                                       throws java.sql.SQLException

Create or obtain a CallableStatement from the pool.

Specified by:

prepareCall in interface java.sql.Connection

Overrides:

prepareCall in class DelegatingConnection

Parameters:

sql - the sql string used to define the CallableStatement

Returns:

a PoolableCallableStatement

Throws:

java.sql.SQLException

Since:

1.3

prepareCall

public java.sql.CallableStatement prepareCall(java.lang.String sql,
                                              int resultSetType,
                                              int resultSetConcurrency)
                                       throws java.sql.SQLException

Create or obtain a CallableStatement from the pool.

Specified by:

prepareCall in interface java.sql.Connection

Overrides:

prepareCall in class DelegatingConnection

Parameters:

sql - the sql string used to define the CallableStatement

resultSetType - result set type

resultSetConcurrency - result set concurrency

Returns:

a PoolableCallableStatement

Throws:

java.sql.SQLException

Since:

1.3

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql)
                                            throws java.sql.SQLException

Create or obtain a PreparedStatement from the pool.

Specified by:

prepareStatement in interface java.sql.Connection

Overrides:

prepareStatement in class DelegatingConnection

Parameters:

sql - the sql string used to define the PreparedStatement

Returns:

a PoolablePreparedStatement

Throws:

java.sql.SQLException

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql,
                                                   int resultSetType,
                                                   int resultSetConcurrency)
                                            throws java.sql.SQLException

Create or obtain a PreparedStatement from the pool.

Specified by:

prepareStatement in interface java.sql.Connection

Overrides:

prepareStatement in class DelegatingConnection

Parameters:

sql - the sql string used to define the PreparedStatement

resultSetType - result set type

resultSetConcurrency - result set concurrency

Returns:

a PoolablePreparedStatement

Throws:

java.sql.SQLException

toString

public java.lang.String toString()

Description copied from class: DelegatingConnection

Returns a string representation of the metadata associated with the innnermost delegate connection.

Overrides:

toString in class DelegatingConnection

validateObject

public boolean validateObject(java.lang.Object key,
                              java.lang.Object obj)

KeyedPoolableObjectFactory method for validating pooled statements. Currently always returns true.

Specified by:

validateObject in interface org.apache.commons.pool.KeyedPoolableObjectFactory

Parameters:

key - ignored

obj - ignored

Returns:

true