Getting Started with IBM Data Studio for DB2

Chapter 8 – Developing SQL stored procedures 261
12. View the results: The Debug perspective provides the same SQL Results view as in
the IBM SQL and Routine Development perspective so that you can see the status
and results of running the stored procedure. The Parameters tab on the right in the
SQL Results view will show your stored procedure’s input and output parameters. This
is shown in Figure 8.30. The value of p_in is 1, since that is the value that caused
the stored procedure to run (even though you changed it to 2 while in the debug mode
before executing the IF condition). The value ofp_out is 3.
Figure 8.30 – View the debug results
8.4 Exercises
Now that you have gone through the process of creating, deploying, testing, debugging and
running a stored procedure, it is time for you to test this yourself by creating the following
procedure. Note the procedure has one intentional bug for you to discover. The output of
the procedure should be 2, 3 or 4.
CREATE PROCEDURE SP1 (IN p_in INT, OUT p_out INT)
P1: BEGIN
END P1
IF p_in = 1 THEN
SET p_in = 2;
ELSEIF p_in = 2 THEN
ELSE
END IF;
8.5 Summary
SET p_out = 3;
SET p_out 4;
In this chapter, you learned the value of using stored procedures to improve performance
of SQL access by being able to process a set of SQL on the database server rather than
sending each request over the wire separately. In addition, by encapsulating the database
logic, those stored procedures can be called and used by multiple applications.