//***************************************************************************
// (c) Copyright IBM Corp. 2007 All rights reserved.
// 
// The following sample of source code ("Sample") is owned by International 
// Business Machines Corporation or one of its subsidiaries ("IBM") and is 
// copyrighted and licensed, not sold. You may use, copy, modify, and 
// distribute the Sample in any form without payment to IBM, for the purpose of 
// assisting you in the development of your applications.
// 
// The Sample code is provided to you on an "AS IS" basis, without warranty of 
// any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR 
// IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do 
// not allow for the exclusion or limitation of implied warranties, so the above 
// limitations or exclusions may not apply to you. IBM shall not be liable for 
// any damages you suffer as a result of using, copying, modifying or 
// distributing the Sample, even if IBM has been advised of the possibility of 
// such damages.
//***************************************************************************
//
// SOURCE FILE NAME: DbConMDataSources.sqlj
//
// SAMPLE: Connect to a database using Multiple DataSources with Type 4 driver
//
//         This sample program shows how to connect and access to a database 
//         using multiple DataSources (registered in a JNDI namespace) in an SQLJ 
//         application using the Universal JDBC Type 4 driver.
//
//         This sample program uses two contexts. Each of these contexts is 
//         used by a different DataSource. The underlying connection from the 
//         first context, ctx1, is obtained from the DataSource 
//         jdbc/DB2SimpleDataSource_ds1. The underlying connection from the
//         second context, ctx2, is obtained from the DataSource 
//         jdbc/DB2SimpleDataSource_ds2. 
//
//         These DataSources are registered using createRegisterDS.java 
//         and DS2.prop. Refer to the README file for details on how to run 
//         this sample. 
//
// SQL Statements USED:
//         SELECT
//
// Classes used from Util.sqlj are:
//         Data
//
//                           
// Output will vary depending on the JDBC driver connectivity used.
//***************************************************************************
//
// For more information on the sample programs, see the README file.
//
// For information on developing Java applications see the Developing Java Applications book.
//
// For information on using SQL statements, see the SQL Reference.
//
// For the latest information on programming, compiling, and running DB2
// applications, visit the DB2 Information Center at
//     http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp
//**************************************************************************/

import java.sql.*;
import sqlj.runtime.*;
import sqlj.runtime.ref.*;

#sql iterator simplePosIter1(String, String);
#sql iterator simplePosIter2(int, String);
#sql context DataSourcesCtx1 with (dataSource="jdbc/DB2SimpleDataSource_ds1");
#sql context DataSourcesCtx2 with (dataSource="jdbc/DB2SimpleDataSource_ds2");

class DbConMDataSources 
{
  public static void main(String argv[]) throws SQLException
  {
    System.out.println();
    System.out.print(
      "THIS SAMPLE SHOWS HOW TO CONNECT AND ACCESS TO THE SAMPLE DATABASE \n" +
      "USING MULTIPLE DATASOURCES: \n" +
      "  jdbc/DB2SimpleDataSource_ds1 \n" +
      "  jdbc/DB2SimpleDataSource_ds2 \n" +
      "WITH THE JDBC TYPE 4 DRIVER. \n");

    // Using DataSources to obtain Connection Contexts. 
    // Create 2 Contexts. One for each DataSource.
    DataSourcesCtx1 ctx1 = new DataSourcesCtx1();
    DataSourcesCtx2 ctx2 = new DataSourcesCtx2();

    try
    {
      simplePosIter1 posIter1 = null;
      simplePosIter2 posIter2 = null;
      String empno = null;
      String firstname= null;

      System.out.println();
      System.out.println(
        "----------------------------------------------------------\n" +
        "  NOTE! \n" +
        "    Connection is obtained from the DataSource:" +
           " jdbc/DB2SimpleDataSource_ds1 \n" +
        "    \n" +
        "  Perform:\n" +
        "    SELECT empno, firstnme\n" +
        "      FROM employee\n" +
        "      WHERE firstnme like 'MA%'\n");

      #sql [ctx1] posIter1 = { SELECT empno, firstnme 
                                 FROM employee
                                 WHERE firstnme like 'MA%' };

      System.out.println(
        "  Results:\n" +
        "    EMPNO  FIRSTNME \n" +
        "    ------ ---------- ");
	
      while (true)
      {
        #sql { FETCH :posIter1 into :empno, :firstname };
	if (posIter1.endFetch())
        {
          break;
        }
        System.out.println("    "+Data.format(empno, 6) +
                           " " + Data.format(firstname, 12));
      }

      System.out.println();
      System.out.println(
        "----------------------------------------------------------\n" +
        "  NOTE! \n" +
        "    Connection is obtained from the DataSource:" +
           " jdbc/DB2SimpleDataSource_ds2 \n");

      try
      {
        #sql[ctx2] { DROP TABLE DS_test  };
        System.out.println("  DROP TABLE DS_test \n");
      }
      catch (SQLException s)
      {}

      // Create the table 'DS_test' in the 'sample' database
      #sql[ctx2] { CREATE TABLE DS_test(c1 INT, c2 CHAR(20)) };
      System.out.println("  CREATE TABLE DS_test(c1 INT, c2 CHAR(20)) \n");

      // Insert data into the table 'DS_test'
      #sql[ctx2] { INSERT INTO DS_test VALUES(1, 'ABC') };
      System.out.println ("  INSERT INTO DS_test VALUES(1, 'ABC') \n");

      System.out.println(
        "  Perform:\n" +
        "    SELECT * FROM DS_test\n");

      #sql[ctx2] posIter2 = { SELECT * FROM DS_test };

      System.out.println(
        "  Results:\n" +
        "    EMPNO  FIRSTNME \n" +
        "    ------ ---------- ");
	
      int index = 0;
      String value= null;

      while (true)
      {
        #sql { FETCH :posIter2 into :index, :value };
        if (posIter2.endFetch())
        {
          break;
        }
        System.out.println("    "+Data.format(index, 6) +
                           " " + Data.format(value, 12));
      }
    }
    catch(Exception ex)
    {
      if (ex instanceof java.sql.SQLException)
      {
        System.out.println("error code: " +
          ((java.sql.SQLException)(ex)).getErrorCode());
      }
    }
  } // end main
} // end class