Getting Started with IBM Data Studio for DB2

240 Getting Started with IBM Data Studio for DB2
4. View the output or results from your test run. When you run the stored procedure, you
can determine whether it ran successfully, and whether its result sets are what you
expect. You can also test the logic of the routine and the accuracy of output arguments
and result sets. When you run a stored procedure from Data Studio, the results of the
stored procedure are displayed in the SQL Results view.
5. At this point, you could optionally use the routine editor to make changes to the stored
procedure depending on your business requirements. The routine editor is a tool to
view and edit the source code. You need to redeploy the stored procedure whenever
there are any changes.
6. Finally, the last step is to optionally debug the stored procedure, which requires that
you actually deploy the stored procedure for debugging. In other words, there is an
option on deployment that you must specify, to enable the integrated debugger. By
stepping through your code while you are running in debug mode and viewing the
results, you can discover problems with your stored procedure or better understand the
functional behavior of your stored procedure in certain scenarios.
8.3 Developing a stored procedure: An example
In the following example, you will walk through the steps to create, test, deploy, debug and
edit a DB2 SQL stored procedure in Data Studio. In this example, we will create the stored
procedure illustrated in Listing 8.1. This stored procedure accepts one input parameter and
returns one output parameter with the objective of testing a conditionalIF statement.
CREATE PROCEDURE SP1 (IN p_in INT, OUT p_out INT)
-- DECLARE an input and output parameter
P1: BEGIN
END P1
-- Code an IF statement
IF p_in = 1 THEN
SET p_out = 2;
ELSEIF p_in = 2 THEN
ELSE
END IF;
SET p_out = 3;
SET p_out = 4;
Listing 8.1 – A sample SQL stored procedure
8.3.1 Create a data development project
In this example, we use the same workspace and database that was used in previous
chapters.
Open IBM SQL and Routine Development perspective by selecting Window -> Open
Perspective -> Other, then select IBM SQL and Routine Development in the Open
Perspective window.