/*
 * @(#) DBTest.java
 *
 * JOTM: Java Open Transaction Manager 
 *
 * This project is developed inside the ObjectWeb Consortium,
 * http://www.objectweb.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * --------------------------------------------------------------------------
 * $Id$
 * --------------------------------------------------------------------------
 */
 
 package foo;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
import javax.transaction.UserTransaction;

public class DBTest{

    int foo = -1;
    // value stored in DB

    public void init(String completion) {
        try{
            Context ctx = new InitialContext();
 
            // JDBC stuff
            DataSource ds =
                (DataSource)ctx.lookup("java:comp/env/jdbc/myDB");

            UserTransaction ut = (UserTransaction)ctx.lookup("java:comp/UserTransaction");

            java.sql.Connection conn = ds.getConnection();

            System.out.println("<<< beginning the transaction >>>");
            ut.begin();

             // JDBC statements
             Statement stmt = conn.createStatement();
             ResultSet rst =
                 stmt.executeQuery("select id, foo from testdata");
             if(rst.next()) {
                 foo=rst.getInt(2);
             }
             System.out.println("foo = "+ foo +" (before completion)");

             PreparedStatement pstmt = conn.prepareStatement("update testdata set foo=? where id=1");
             pstmt.setInt(1,++foo);
             pstmt.executeUpdate();

              if (completion != null && completion.equals("commit")) {
                  System.out.println("<<< committing the transaction >>>");
                  ut.commit();
              } else {
                  System.out.println("<<< rolling back the transaction >>>");
                  ut.rollback();
              }

             // we set foo to the value stored in the DB
             rst =
                 stmt.executeQuery("select id, foo from testdata");
             if(rst.next()) {
                 foo=rst.getInt(2);
             }
             System.out.println("foo = "+ foo +" (after completion)");

             conn.close();
             System.out.println("<<< done >>>");
        }catch(Exception e) {
            System.out.print("DBTest >> ");
            e.printStackTrace();
        }
    }

    public String getFoo() { return ""+foo; }
}