/* * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.sql; import java.sql.Connection;import java.sql.SQLException;import java.sql.Wrapper; /** * <p>A factory for connections to the physical data source that this * <code>DataSource</code> object represents.  An alternative to the * <code>DriverManager</code> facility, a <code>DataSource</code> object * is the preferred means of getting a connection. An object that implements * the <code>DataSource</code> interface will typically be * registered with a naming service based on the * Java<sup><font size=-2>TM</font></sup> Naming and Directory (JNDI) API. * <P> * The <code>DataSource</code> interface is implemented by a driver vendor. * There are three types of implementations: * <OL> *   <LI>Basic implementation -- produces a standard <code>Connection</code> *       object *   <LI>Connection pooling implementation -- produces a <code>Connection</code> *       object that will automatically participate in connection pooling.  This *       implementation works with a middle-tier connection pooling manager. *   <LI>Distributed transaction implementation -- produces a *       <code>Connection</code> object that may be used for distributed *       transactions and almost always participates in connection pooling. *       This implementation works with a middle-tier *       transaction manager and almost always with a connection *       pooling manager. * </OL> * <P> * A <code>DataSource</code> object has properties that can be modified * when necessary.  For example, if the data source is moved to a different * server, the property for the server can be changed.  The benefit is that * because the data source's properties can be changed, any code accessing * that data source does not need to be changed. * <P> * A driver that is accessed via a <code>DataSource</code> object does not * register itself with the <code>DriverManager</code>.  Rather, a * <code>DataSource</code> object is retrieved though a lookup operation * and then used to create a <code>Connection</code> object.  With a basic * implementation, the connection obtained through a <code>DataSource</code> * object is identical to a connection obtained through the * <code>DriverManager</code> facility. * * @since 1.4 */ public interface DataSource  extends CommonDataSource,Wrapper {   /**   * <p>Attempts to establish a connection with the data source that   * this <code>DataSource</code> object represents.   *   * @return  a connection to the data source   * @exception SQLException if a database access error occurs   */  Connection getConnection() throws SQLException;   /**   * <p>Attempts to establish a connection with the data source that   * this <code>DataSource</code> object represents.   *   * @param username the database user on whose behalf the connection is   *  being made   * @param password the user's password   * @return  a connection to the data source   * @exception SQLException if a database access error occurs   * @since 1.4   */  Connection getConnection(String username, String password)    throws SQLException; }