Driver enhancement

The following is a program that creates a user-defined function, myudr, with two OUT parameters and one IN parameter, and then executes the myudr() function. The example requires server-side support for multiple OUT parameters; hence it only works for HCL Informix®, Version 9.4 or above. For more information about UDRs, see IBM® Informix User-Defined Routines and Data Types Developer's Guide and IBM J/Foundation Developer's Guide.

import java.sql.*;
public class myudr {

  public myudr() {
  }

  public static void main(String args[]) {
    Connection myConn = null;
    try {
      Class.forName("com.informix.jdbc.IfxDriver");
      myConn = DriverManager.getConnection(
          "jdbc:informix-sqli:MYSYSTEM:18551/testDB:"
          +"INFORMIXSERVER=patriot1;user=USERID;"
          +"password=MYPASSWORD");
    }
    catch (ClassNotFoundException e) {
      System.out.println(
       "problem with loading Ifx Driver\n" + e.getMessage());
    }
    catch (SQLException e) {
      System.out.println(
        "problem with connecting to db\n" + e.getMessage());
    }
    try {
      Statement stmt = myConn.createStatement();
      stmt.execute("DROP FUNCTION myudr");
    }
    catch (SQLException e){
    }
    try
    {
      Statement stmt = myConn.createStatement();

      stmt.execute(
        "CREATE FUNCTION myudr(OUT arg1 int, arg2 int, OUT arg3 int)"
        +" RETURNS boolean; LET arg1 = arg2; LET arg3 = arg2 * 2;"
        +"RETURN 't'; END FUNCTION;");
    }
    catch (SQLException e) {
      System.out.println(
        "problem with creating function\n" + e.getMessage());
    }

    Connection conn = myConn;

    try
    {
      String command = "{? = call myudr(?, ?, ?)}";
      CallableStatement cstmt = conn.prepareCall (command);

      // Register arg1 OUT parameter
      cstmt.registerOutParameter(1, Types.INTEGER);

      // Pass in value for IN parameter
      cstmt.setInt(2, 4);

      // Register arg3 OUT parameter
      cstmt.registerOutParameter(3, Types.INTEGER);

      // Execute myudr
      ResultSet rs = cstmt.executeQuery();

      // executeQuery returns values via a resultSet
      while (rs.next())
      {
        // get value returned by myudr
        boolean b = rs.getBoolean(1);
        System.out.println("return value from myudr = " + b);
      }

      // Retrieve OUT parameters from myudr
      int i = cstmt.getInt(1);
      System.out.println("arg1 OUT parameter value = " + i);

      int k = cstmt.getInt(3);
      System.out.println("arg3 OUT parameter value = " + k);

      rs.close();
      cstmt.close();
      conn.close();
    }
    catch (SQLException e)
    {
      System.out.println("SQLException: " + e.getMessage());
      System.out.println("ErrorCode: " + e.getErrorCode());
      e.printStackTrace();
    }
  }
}
- - -
.../j2sdk1.4.0/bin/java ... myudr 
return value from myudr = true
arg1 OUT parameter value = 4
arg3 OUT parameter value = 8