//***************************************************************************
// (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: DbUse.sqlj
//
// SAMPLE: How to use a database
//
// SQL Statements USED:
//         CREATE TABLE
//         DROP TABLE
//         DELETE
//         COMMIT
//         ROLLBACK
//
// Classes used from Util.sqlj are:
//         Db
//
//                           
// 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.*;

class DbUse
{
  public static void main(String argv[])
  {
    try
    {
      Db db = new Db(argv);

      System.out.println();
      System.out.println("THIS SAMPLE SHOWS HOW TO USE A DATABASE.");

      // connect to the 'sample' database
      db.getDefaultContext();

      StaticStmtInvoke();
      StaticStmtInvokeWithHostVars();

      // disconnect from the 'sample' database
      db.disconnect();
    }
    catch (Exception e)
    {
      System.out.println(e);
    }
  } // main

  static void StaticStmtInvoke()
  {
    try
    {
      System.out.println();
      System.out.println(
        "----------------------------------------------------------\n" +
        "USE THE SQL STATEMENTS:\n" +
        "  CREATE TABLE\n" +
        "  DROP TABLE\n" +
        "TO SHOW HOW TO INVOKE SQL STATEMENTS.");

      // create a table
      System.out.println();
      System.out.println(
        "  Invoke the statement:\n" +
        "    CREATE TABLE table1(col1 INTEGER)");

      #sql {CREATE TABLE table1(col1 INTEGER)};

      System.out.println();
      System.out.println("  COMMIT");

      #sql {COMMIT};

      // drop a table
      System.out.println();
      System.out.println("  Invoke the statement:\n" +
                         "    DROP TABLE table1");

      #sql {DROP TABLE table1};

      System.out.println();
      System.out.println("  COMMIT");

      #sql {COMMIT};
    }
    catch (Exception e)
    {
      System.out.println(e);
    }
  } //  StaticStmtInvoke

  static void StaticStmtInvokeWithHostVars()
  {
    try
    {
      int hostVar1;
      String hostVar2;

      System.out.println();
      System.out.println(
        "----------------------------------------------------------\n" +
        "USE THE SQL STATEMENTS:\n" +
        "  DELETE\n" +
        "  ROLLBACK\n" +
        "TO SHOW HOW TO USE HOST VARIABLES.");

      // execute a statement with host variables
      System.out.println();
      System.out.println(
        "  Execute:\n" +
        "    DELETE FROM org\n" +
        "      WHERE deptnumb = :hostVar1\n" +
        "      AND division = :hostVar2\n" +
        "    for\n" +
        "      hostVar1 = 15\n" +
        "      hostVar2 = 'Eastern'");

      hostVar1 = 15;
      hostVar2 = "Eastern";

      #sql {DELETE FROM org
              WHERE deptnumb = :hostVar1 AND
                    division = :hostVar2};

      // rollback the transaction
      System.out.println();
      System.out.println("  Rollback the transaction.");
      #sql {ROLLBACK};
    }
    catch (Exception e)
    {
      System.out.println(e);
    }
  } // StaticStmtInvokeWithHostVars
} // DbUse