//  Source File Name: Openftch.sqlj  1.3
//  
//   Licensed Materials -- Property of IBM 
//  
//   (c) Copyright International Business Machines Corporation, 1999. 
//       All Rights Reserved. 
//  
//   US Government Users Restricted Rights - 
//   Use, duplication or disclosure restricted by 
//   GSA ADP Schedule Contract with IBM Corp. 

//   This sample program shows how to execute  
//   SQLJ positioned update/delete statements. 

//  For more information about this sample, refer to the README file. 

//  For more information on Programming in Java, refer to the  
//  "Programming in Java" section of the Application Development Guide. 

//  For more information on building and running Java programs for DB2, 
//  refer to the "Building Java Applets and Applications" section of the  
//  Application Building Guide. 

//  For more information on the SQL language, refer to the SQL Reference. 

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

class Openftch 
{   static
    {   try
        {   Class.forName ("COM.ibm.db2.jdbc.app.DB2Driver").newInstance ();
        } 
        catch (Exception e)
        {   System.out.println ("\n  Error loading DB2 Driver...\n");
            System.out.println (e);
            System.exit(1);
        }
    }

    public static void main(String argv[])
    {   try 
        {   System.out.println ("  Java Openftch Sample");

            String url = "jdbc:db2:sample";       //  URL is jdbc:db2:dbname 
            Connection con = null;          

            //  Set the connection 
            if (argv.length == 0) 
            {   //  connect with default id/password 
                con = DriverManager.getConnection(url);  
            }
            else if (argv.length == 2)
            {   String userid = argv[0];
                String passwd = argv[1];

                //  connect with user-provided username and password 
                con = DriverManager.getConnection(url, userid, passwd); 
            }
            else 
            {   throw new Exception(
                       "\nUsage: java Openftch [username password]\n");
            } //  if - else if - else  

            //  Set the default context 
            DefaultContext ctx = new DefaultContext(con);            
            DefaultContext.setDefaultContext(ctx);

            //  Enable transactions 
            con.setAutoCommit(false);

            //  Executing SQLJ positioned update/delete statements. 
            try
            {   OpF_Curs forUpdateCursor;

                String name = null;
                short  dept=0;
 
 
                #sql forUpdateCursor = 
                {   SELECT name, dept 
                        FROM staff
                        WHERE job='Mgr' 
                }; //  #sql            /* :rk.1:erk. *//* :rk.2:erk. */ 
 
                while (true) 
                {   #sql 
                    {   FETCH :forUpdateCursor
                            INTO :name, :dept
                    }; //  #sql                        /* :rk.3:erk. */ 
                    if (forUpdateCursor.endFetch()) break;

                    if (dept > 40)
                    {   System.out.println (
                            name + " in dept. " 
                            + dept + " will be demoted to Clerk");
                        #sql
                        {   UPDATE staff SET job = 'Clerk'
                            WHERE CURRENT OF :forUpdateCursor
                        }; //  #sql                    /* :rk.4:erk. */ 
                    }
                    else
                    {   System.out.println (
                            name + " in dept. " + dept
                            + " will be DELETED!");
                        #sql
                        {   DELETE FROM staff
                            WHERE CURRENT OF :forUpdateCursor
                        }; //  #sql 
                    } //  if - else 
                }
                forUpdateCursor.close();  /* :rk.5:erk. */
            }
            catch( Exception e )
            {   throw e; 
            } 
            finally
            {   //  Rollback the transaction 
                System.out.println("\nRollback the transaction...");
                #sql { ROLLBACK };
                System.out.println("Rollback done.");
            } //  try - catch - finally 
        }
        catch( Exception e )
        {   System.out.println (e);
        } //  try - catch 
    } //  main 
} //  class Openftch