Example: Create a procedure with input and output parameters

import java.sql.*;
import java.util.Properties;

public class CallableStatementExample2 {

    public static void main(java.lang.String[] args) {

        // Register the Native JDBC driver.  If we cannot 
        // register the driver, the test cannot continue.
        try {
            Class.forName("com.ibm.db2.jdbc.app.DB2Driver");

            // Create the connection properties
            Properties properties = new Properties ();
            properties.put ("user", "userid");
            properties.put ("password", "password");

            // Connect to the local iSeries database
            Connection c = DriverManager.getConnection("jdbc:db2://*local", properties);

            Statement s = c.createStatement();

            // Create a procedure with in, out, and in/out parameters.
            String sql = "CREATE PROCEDURE MYLIBRARY.SQLSPEX2 " +
                          "(IN P1 INTEGER, OUT P2 INTEGER, INOUT P3 INTEGER) " +
                          "LANGUAGE SQL SPECIFIC MYLIBRARY.SQLSPEX2 " +
                          "EX2: BEGIN " +
                          "   SET P2 = P1 + 1; " +
                          "   SET P3 = P3 + 1; " +
                          "END EX2 ";

            try {
                s.executeUpdate(sql);
            } catch (SQLException e) {
                // NOTE:  We are ignoring the error here.  We are making 
                //        the assumption that the only reason this fails
                //        is because the procedure already exists.  Other
                //        reasons that it could fail are because the C compiler
                //        is not found to compile the procedure or because
                //        collection MYLIBRARY does not exist on the system.
            }
            s.close();

            // Prepare a callable statement used to run the procedure.
            CallableStatement cs = c.prepareCall("CALL MYLIBRARY.SQLSPEX2(?, ?, ?)");
            
            // All input parameters must be set and all output parameters must 
            // be registered.  Notice that this means we have two calls to make 
            // for an input output parameter.
            cs.setInt(1, 5);
            cs.setInt(3, 10);
            cs.registerOutParameter(2, Types.INTEGER);
            cs.registerOutParameter(3, Types.INTEGER);

            // Run the procedure
            cs.executeUpdate();

            // Verify the output parameters have the desired values.
            System.out.println("The value of P2 should be P1 (5) + 1 = 6.  -->  " + cs.getInt(2));
            System.out.println("The value of P3 should be P3 (10) + 1 = 11.  -->  " + cs.getInt(3));

            cs.close();  // close the CallableStatement object
            c.close();   // close the Connection object.

        } catch (Exception e) {
            System.out.println("Something failed..");
            System.out.println("Reason: " + e.getMessage());
            e.printStackTrace();
        }
    }
}