/*

 * 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;

}