/*
 * Distributed as part of c3p0 v.0.9.5.1
 *
 * Copyright (C) 2015 Machinery For Change, Inc.
 *
 * Author: Steve Waldman <swaldman@mchange.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of EITHER:
 *
 *     1) The GNU Lesser General Public License (LGPL), version 2.1, as 
 *        published by the Free Software Foundation
 *
 * OR
 *
 *     2) The Eclipse Public License (EPL), version 1.0
 *
 * You may choose which license to accept if you wish to redistribute
 * or modify this work. You may offer derivatives of this work
 * under the license you have chosen, or you may provide the same
 * choice of license which you have been offered here.
 *
 * This software 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.
 *
 * You should have received copies of both LGPL v2.1 and EPL v1.0
 * along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
 * If not, the text of these licenses are currently available at
 *
 * LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 *  EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php 
 * 
 */

import java.sql.*;
import javax.naming.*;
import javax.sql.DataSource;

/**
 *  This example shows how to programmatically get and directly use
 *  an unpooled DataSource
 */
public final class UseJndiDataSource
{

    public static void main(String[] argv)
    {
	try
	    {
		// let a command line arg specify the name we will
		// lookup our DataSource.
		String jndiName = argv[0];

		// Create an InitialContext, and lookup the DataSource in 
		// the usual way.
		//
		// We are using the no-arg version of InitialContext's constructor,
		// therefore, the jndi environment must be first set via a jndi.properties
		// file, System properties, or by some other means.
		InitialContext ctx = new InitialContext();

		// acquire the DataSource... this is the only c3p0 specific code here
		DataSource ds = (DataSource) ctx.lookup( jndiName );

		// get hold of a Connection an do stuff, in the usual way
		Connection con  = null;
		Statement  stmt = null;
		ResultSet  rs   = null;
		try
		    {
			con = ds.getConnection();
			stmt = con.createStatement();
			rs = stmt.executeQuery("SELECT * FROM foo");
			while (rs.next())
			    System.out.println( rs.getString(1) );
		    }
		finally
		    {
			// i try to be neurotic about ResourceManagement,
			// explicitly closing each resource
			// but if you are in the habit of only closing
			// parent resources (e.g. the Connection) and
			// letting them close their children, all
			// c3p0 DataSources will properly deal.
			attemptClose(rs);
			attemptClose(stmt);
			attemptClose(con);
		    }
	    }
	catch (Exception e)
	    { e.printStackTrace(); }
    }

    static void attemptClose(ResultSet o)
    {
	try
	    { if (o != null) o.close();}
	catch (Exception e)
	    { e.printStackTrace();}
    }

    static void attemptClose(Statement o)
    {
	try
	    { if (o != null) o.close();}
	catch (Exception e)
	    { e.printStackTrace();}
    }

    static void attemptClose(Connection o)
    {
	try
	    { if (o != null) o.close();}
	catch (Exception e)
	    { e.printStackTrace();}
    }

    private UseJndiDataSource()
    {}
}
