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Apache Commons DBCP software implements Database Connection Pooling
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.dbcp2.cpdsadapter;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.apache.commons.dbcp2.DelegatingCallableStatement;
import org.apache.commons.dbcp2.DelegatingConnection;
import org.apache.commons.dbcp2.DelegatingPreparedStatement;
/**
* This class is the Connection that will be returned from
* PooledConnectionImpl.getConnection(). Most methods are wrappers around the JDBC 1.x
* Connection. A few exceptions include preparedStatement and close. In accordance with the JDBC
* specification this Connection cannot be used after closed() is called. Any further usage will result in an
* SQLException.
*
* ConnectionImpl extends DelegatingConnection to enable access to the underlying connection.
*
*
* @since 2.0
*/
class ConnectionImpl extends DelegatingConnection {
private final boolean accessToUnderlyingConnectionAllowed;
/** The object that instantiated this object */
private final PooledConnectionImpl pooledConnection;
/**
* Creates a ConnectionImpl.
*
* @param pooledConnection
* The PooledConnection that is calling the ctor.
* @param connection
* The JDBC 1.x Connection to wrap.
* @param accessToUnderlyingConnectionAllowed
* if true, then access is allowed to the underlying connection
*/
ConnectionImpl(final PooledConnectionImpl pooledConnection, final Connection connection,
final boolean accessToUnderlyingConnectionAllowed) {
super(connection);
this.pooledConnection = pooledConnection;
this.accessToUnderlyingConnectionAllowed = accessToUnderlyingConnectionAllowed;
}
/**
* Marks the Connection as closed, and notifies the pool that the pooled connection is available.
*
* In accordance with the JDBC specification this Connection cannot be used after closed() is called. Any further
* usage will result in an SQLException.
*
*
* @throws SQLException
* The database connection couldn't be closed.
*/
@Override
public void close() throws SQLException {
if (!isClosedInternal()) {
try {
passivate();
} finally {
setClosedInternal(true);
pooledConnection.notifyListeners();
}
}
}
/**
* If pooling of CallableStatements is turned on in the {@link DriverAdapterCPDS}, a pooled object may
* be returned, otherwise delegate to the wrapped JDBC 1.x {@link java.sql.Connection}.
*
* @param sql
* an SQL statement that may contain one or more '?' parameter placeholders. Typically this statement is
* specified using JDBC call escape syntax.
* @return a default CallableStatement object containing the pre-compiled SQL statement.
* @exception SQLException
* Thrown if a database access error occurs or this method is called on a closed connection.
* @since 2.4.0
*/
@Override
public CallableStatement prepareCall(final String sql) throws SQLException {
checkOpen();
try {
return new DelegatingCallableStatement(this, pooledConnection.prepareCall(sql));
} catch (final SQLException e) {
handleException(e); // Does not return
return null;
}
}
/**
* If pooling of CallableStatements is turned on in the {@link DriverAdapterCPDS}, a pooled object may
* be returned, otherwise delegate to the wrapped JDBC 1.x {@link java.sql.Connection}.
*
* @param sql
* a String object that is the SQL statement to be sent to the database; may contain on or
* more '?' parameters.
* @param resultSetType
* a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* a concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @return a CallableStatement object containing the pre-compiled SQL statement that will produce
* ResultSet objects with the given type and concurrency.
* @throws SQLException
* Thrown if a database access error occurs, this method is called on a closed connection or the given
* parameters are not ResultSet constants indicating type and concurrency.
* @since 2.4.0
*/
@Override
public CallableStatement prepareCall(final String sql, final int resultSetType, final int resultSetConcurrency)
throws SQLException {
checkOpen();
try {
return new DelegatingCallableStatement(this,
pooledConnection.prepareCall(sql, resultSetType, resultSetConcurrency));
} catch (final SQLException e) {
handleException(e); // Does not return
return null;
}
}
/**
* If pooling of CallableStatements is turned on in the {@link DriverAdapterCPDS}, a pooled object may
* be returned, otherwise delegate to the wrapped JDBC 1.x {@link java.sql.Connection}.
*
* @param sql
* a String object that is the SQL statement to be sent to the database; may contain on or
* more '?' parameters.
* @param resultSetType
* one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @param resultSetHoldability
* one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT
* or ResultSet.CLOSE_CURSORS_AT_COMMIT.
* @return a new CallableStatement object, containing the pre-compiled SQL statement, that will
* generate ResultSet objects with the given type, concurrency, and holdability.
* @throws SQLException
* Thrown if a database access error occurs, this method is called on a closed connection or the given
* parameters are not ResultSet constants indicating type, concurrency, and holdability.
* @since 2.4.0
*/
@Override
public CallableStatement prepareCall(final String sql, final int resultSetType, final int resultSetConcurrency,
final int resultSetHoldability) throws SQLException {
checkOpen();
try {
return new DelegatingCallableStatement(this,
pooledConnection.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability));
} catch (final SQLException e) {
handleException(e); // Does not return
return null;
}
}
/**
* If pooling of PreparedStatements is turned on in the {@link DriverAdapterCPDS}, a pooled object may
* be returned, otherwise delegate to the wrapped JDBC 1.x {@link java.sql.Connection}.
*
* @param sql
* SQL statement to be prepared
* @return the prepared statement
* @throws SQLException
* if this connection is closed or an error occurs in the wrapped connection.
*/
@Override
public PreparedStatement prepareStatement(final String sql) throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this, pooledConnection.prepareStatement(sql));
} catch (final SQLException e) {
handleException(e); // Does not return
return null;
}
}
/**
* If pooling of PreparedStatements is turned on in the {@link DriverAdapterCPDS}, a pooled object may
* be returned, otherwise delegate to the wrapped JDBC 1.x {@link java.sql.Connection}.
*
* @throws SQLException
* if this connection is closed or an error occurs in the wrapped connection.
*/
@Override
public PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency)
throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this,
pooledConnection.prepareStatement(sql, resultSetType, resultSetConcurrency));
} catch (final SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency,
final int resultSetHoldability) throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this,
pooledConnection.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability));
} catch (final SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(final String sql, final int autoGeneratedKeys) throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this, pooledConnection.prepareStatement(sql, autoGeneratedKeys));
} catch (final SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(final String sql, final int columnIndexes[]) throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this, pooledConnection.prepareStatement(sql, columnIndexes));
} catch (final SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(final String sql, final String columnNames[]) throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this, pooledConnection.prepareStatement(sql, columnNames));
} catch (final SQLException e) {
handleException(e);
return null;
}
}
//
// Methods for accessing the delegate connection
//
/**
* If false, getDelegate() and getInnermostDelegate() will return null.
*
* @return true if access is allowed to the underlying connection
* @see ConnectionImpl
*/
public boolean isAccessToUnderlyingConnectionAllowed() {
return accessToUnderlyingConnectionAllowed;
}
/**
* Get the delegated connection, if allowed.
*
* @return the internal connection, or null if access is not allowed.
* @see #isAccessToUnderlyingConnectionAllowed()
*/
@Override
public Connection getDelegate() {
if (isAccessToUnderlyingConnectionAllowed()) {
return getDelegateInternal();
}
return null;
}
/**
* Get the innermost connection, if allowed.
*
* @return the innermost internal connection, or null if access is not allowed.
* @see #isAccessToUnderlyingConnectionAllowed()
*/
@Override
public Connection getInnermostDelegate() {
if (isAccessToUnderlyingConnectionAllowed()) {
return super.getInnermostDelegateInternal();
}
return null;
}
}