//  Source File Name: Outcli.java  1.2
//  
//   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. 

//   Sample Program Outcli - Calling the SQLJ Output Stored Procedure 

//   Steps to run the sample: 
//   (1) create and populate the SAMPLE database (db2sampl) 
//   (2) (n)make Outsrv 
//   (3) (n)make Outcli 
//   (4) run Outcli 

//   NOTES: (1) The jdk11_path database manager configuration parameter must 
//              be set 
//          (2) The CLASSPATH and shared library path environment variables 
//              must be set, as for any JDBC application. 
//          (3) Visit http://www.software.ibm.com/data/db2/java 
//              for current DB2 Java information 

//  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 creating stored procedures, refer to the  
//  "Writing Stored Procedures" 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. 


//   Class Outcli  does the following: 
//   (1) register the stored procedure 
//   (2) call the stored procedure 

import java.sql.*;              //  JDBC classes 

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

    public static void main (String argv[])
    {   try 
        {   System.out.println ("  Java Output Stored Procedure Sample");
            //  Connect to Sample database 

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

            if (argv.length == 0)  /* :rk.2:erk. */
            {   //  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 Outcli [username password]\n");
            } 

            //  Set AutoCommit 
            con.setAutoCommit(true);

            //  Register and call the Remote Procedure 
            String callName = "Outsrv";
            String storedProcName = "Outsrv!outputStoredProcedure";
            String mode = "fenced";

            Statement stmt = con.createStatement (); //  for DROP/CREATE 
      
            //  drop the stored procedure if it exists 
            try
            {   stmt.executeUpdate ("DROP PROCEDURE " + callName);
            }
            catch (Exception e)
            {   //  ignore this error 
            }

            //  construct a parameter list for the stored procedure and 
            //  register it in the system catalogs /* :rk.3:erk. */ 
            String parameterList = "(out    medianSalary     double)";

            System.out.println ("\n  Registering Java stored procedure " + callName +
                          "\n     as " + storedProcName +
                          "\n     in " + mode + " mode");

            stmt.executeUpdate ("CREATE PROCEDURE " + callName + parameterList +
                          " LANGUAGE JAVA " +
                          " PARAMETER STYLE JAVA " + mode +
                          " EXTERNAL NAME '" + storedProcName + "'" +
                          " READS SQL DATA");
            stmt.close ();

            //  prepare the CALL statement 
            CallableStatement callableStmt;
            String sql = "Call " + callName + "(?) ";
            callableStmt = con.prepareCall (sql);

            //  register the output parameters /* :rk.4:erk. */ 
            callableStmt.registerOutParameter (1, Types.DOUBLE);

            //  set all parameters  
            callableStmt.setDouble (1, 0.00);
  
            //  call the stored procedure 
            con.setAutoCommit(false);  //  Enable transactions 
            try
            {   System.out.println ("\n  Calling stored procedure : " + callName );
                callableStmt.execute (); /* :rk.5:erk. */

                //  Commit the transaction 
                con.commit();
            } 
            catch (Exception e)
            {   //  Rollback the transaction 
                con.rollback();
                throw e; 
            }
            finally
            {   //  Restore initial AutoCommit 
                con.setAutoCommit(true);
            }
 
            //  retrieve output parameters 
            double medianSalary = callableStmt.getDouble (1);

            //  display the information returned from the stored procedure 
            System.out.println ("\n  Median Salary: " + medianSalary);
      
            callableStmt.close (); /* :rk.6:erk. */
        }
        catch (Exception e)
        {   System.out.println (e);
        }
    }
}