userconnection.java

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/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.sql;

import com.caucho.log.Log;
import com.caucho.util.L10N;

import java.sql.*;
import java.util.ArrayList;
import java.util.Map;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Adapts the JDBC 2.0 connection pooling and XA support for database drivers
 * which don't understand it.
 *
 * <p>Closing the connection will return the real connection to the pool
 * and close any statements.
 */
public class UserConnection implements java.sql.Connection {
  protected static final Logger log = Log.open(UserConnection.class);
  protected static final L10N L = new L10N(UserConnection.class);

  // The parent XAConnectionAdapter
  private ManagedConnectionImpl _mConn;

  // Maximum statements saved for automatic closing

  private Statement _statement;
  // ArrayList of all the statements created by this connection
  private ArrayList<Statement> _statements;

  /**
   * Creates a new PooledConnection.
   *
   * @param pool the pool the connection belongs to.
   * @param conn the underlying connection.
   */
  UserConnection(ManagedConnectionImpl mConn)
  {
    if (mConn == null || mConn.getDriverConnection() == null)
      throw new NullPointerException();

    _mConn = mConn;
  }

  /**
   * Returns the underlying connection.
   */
  public Connection getConnection()
    throws SQLException
  {
    Connection conn = getDriverConnection();

    if (conn instanceof com.caucho.sql.spy.SpyConnection)
      conn = ((com.caucho.sql.spy.SpyConnection)conn).getConnection();

    return conn;
  }

  public Class getDriverClass()
  {
    return getMConn().getDriverClass();
  }
  
  public String getURL()
  {
    return getMConn().getDBPool().getURL();
  }

  /**
   * Associates with a different mConn.
   */
  void associate(ManagedConnectionImpl mConn)
  {
    _mConn = mConn;
  }

  /**
   * JDBC api to create a new statement.  Any SQL exception thrown here
   * will make the connection invalid, i.e. it can't be put back into
   * the pool.
   *
   * @return a new JDBC statement.
   */
  public Statement createStatement()
    throws SQLException
  {
    Statement stmt;

    Connection conn = getDriverConnection();

    try {
      stmt = conn.createStatement();
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * JDBC api to create a new statement.  Any SQL exception thrown here
   * will make the connection invalid, i.e. it can't be put back into
   * the pool.
   *
   * @return a new JDBC statement.
   */
  public Statement createStatement(int resultSetType, int resultSetConcurrency)
    throws SQLException
  {
    Statement stmt;

    Connection conn = getDriverConnection();

    try {
      stmt = conn.createStatement(resultSetType, resultSetConcurrency);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Creates a statement.
   */
  public Statement createStatement(int resultSetType,
                                   int resultSetConcurrency,
                                   int resultSetHoldability)
    throws SQLException
  {
    Statement stmt;

    Connection conn = getDriverConnection();

    try {
      stmt = conn.createStatement(resultSetType,
                                  resultSetConcurrency,
                                  resultSetHoldability);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Returns a prepared statement with the given sql.
   *
   * @param sql the prepared sql.
   */
  public PreparedStatement prepareStatement(String sql)
    throws SQLException
  {
    PreparedStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getMConn().prepareStatement(this, sql);
    } catch (SQLException e) {
      getMConn().fatalEvent(e);
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserPreparedStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Returns a prepared statement with the given sql.
   *
   * @param sql the prepared sql.
   */
  public PreparedStatement prepareStatement(String sql,
                                            int resultSetType,
                                            int resultSetConcurrency)
    throws SQLException
  {
    PreparedStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareStatement(sql, resultSetType, resultSetConcurrency);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserPreparedStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Returns a prepared statement with the given sql.
   *
   * @param sql the prepared sql.
   */
  public PreparedStatement prepareStatement(String sql,
                                            int resultSetType,
                                            int resultSetConcurrency,
                                            int resultSetHoldability)
    throws SQLException
  {
    PreparedStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareStatement(sql,
                                              resultSetType,
                                              resultSetConcurrency,
                                              resultSetHoldability);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserPreparedStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Returns a prepared statement with the given sql.
   *
   * @param sql the prepared sql.
   */
  public PreparedStatement prepareStatement(String sql,
                                            int resultSetType)
    throws SQLException
  {
    PreparedStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getMConn().prepareStatement(this, sql, resultSetType);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    if (stmt == null)
      throw new IllegalStateException(L.l("prepareStatement returned empty SQL\n{0}",
					  sql));

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserPreparedStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Returns a prepared statement with the given sql.
   *
   * @param sql the prepared sql.
   */
  public PreparedStatement prepareStatement(String sql,
                                            int []columnIndexes)
    throws SQLException
  {
    PreparedStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareStatement(sql, columnIndexes);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserPreparedStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * Returns a prepared statement with the given sql.
   *
   * @param sql the prepared sql.
   */
  public PreparedStatement prepareStatement(String sql,
                                            String []columnNames)
    throws SQLException
  {
    PreparedStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareStatement(sql, columnNames);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserPreparedStatement(this, stmt);
    else
      return stmt;
  }

  public CallableStatement prepareCall(String sql, int resultSetType,
               int resultSetConcurrency)
    throws SQLException
  {
    CallableStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareCall(sql, resultSetType, resultSetConcurrency);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserCallableStatement(this, stmt);
    else
      return stmt;
  }

  public CallableStatement prepareCall(String sql)
    throws SQLException
  {
    CallableStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareCall(sql);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserCallableStatement(this, stmt);
    else
      return stmt;
  }

  public CallableStatement prepareCall(String sql,
                                       int resultSetType,
                                       int resultSetConcurrency,
                                       int resultSetHoldability)
    throws SQLException
  {
    CallableStatement stmt;

    if (getDriverConnection() == null) {
      fatalEvent();
      throw new SQLException(L.l("can't create statement from closed connection."));
    }

    try {
      stmt = getDriverConnection().prepareCall(sql,
                                         resultSetType,
                                         resultSetConcurrency,
                                         resultSetHoldability);
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }

    addStatement(stmt);

    if (_mConn.isWrapStatements())
      return new UserCallableStatement(this, stmt);
    else
      return stmt;
  }

  /**
   * JDBC api to return the connection's catalog.
   *
   * @return the JDBC catalog.
   */
  public String getCatalog()
    throws SQLException
  {
    try {
      return getDriverConnection().getCatalog();
    } catch (SQLException e) {
      fatalEvent();
      throw e;
    }
  }

  /**
   * Sets the JDBC catalog.