In the first nine parts of this series, I’ve introduced you to some of the many features available within the IBM Data Studio integrated development environment (IDE) that’s available for use with the IBM data servers. Specifically, I’ve shown you how to set up database connection objects, the features available when working with these objects, how to generate an overview diagram of your database architecture, how to build OLE DB functions that can be used to easily integrate data from external data sources that have an OLE DB provider, and the various ways you can create an SQL statement using either the IBM Data Studio SQL Builder or SQL Editor.
In Part 10, we’re going take what we’ve learned so far and build some business logic that will serve as the basis for examples I’ll show you in subsequent articles in this series.
Note: Some of the screen shots in this article might look a little different from those in previous articles because I’m using a different version of the IBM Data Studio IDE on a different workstation. Nevertheless, you should be able to follow along easily with the examples in this article. If you ever need to move or copy data development projects to other installations of IBM Data Studio, see “Addendum: Moving data development projects between different workstations” at the end of this article.
Things you have to do to follow the examples in this article…
If you’re just joining this series, the good news is that there’s not a lot you have to do to catch up. To follow along, you need to know how to create database connection objects, work with those connections, create database development projects, and create SQL statements. If you need a refresher, just skim through the last few parts of this series.
From a sample perspective, I assume you created (or have full access to) the SAMPLE database and that it was created using the db2sampl –xml –sql command. In addition, I assume that you have a database development project called DatabaseJournalProject. You also need to have the FEMALEPERSONNEL SQL statement created. I showed you how to do this in Part 6 using the following DML:
SELECT PAULZ.DEPARTMENT.LOCATION, PAULZ.EMPLOYEE.EMPNO,
FROM PAULZ.DEPARTMENT, PAULZ.EMPLOYEE
WHERE PAULZ.DEPARTMENT.DEPTNO = PAULZ.EMPLOYEE.WORKDEPT
AND PAULZ.EMPLOYEE.SEX = 'F'
ORDER BY LASTNAME DESC, FIRSTNME DESC
This query returns a predefined number of attributes that are joined from the EMPLOYEE and DEPARTMENT tables for all female employees registered for a fictitious company.
Building an SQL/PL procedure from an existing SQL statement
In our working example, we have an SQL statement that’s ready for production: FEMALEPERSONNEL. Perhaps in your environment, a separate team builds and tunes SQL statements, while application DBAs are responsible for exposing that logic through stored procedures, user-defined functions (UDFs), Web services, and so on. (The term routine is often used to refer to stored procedures, UDFs, or both: consider it a synonym for these objects.) This is yet another example where the IBM Data Studio IDE really shines because it allows multiple constituents within the application development framework to participate and collaborate on the work they are doing.
To build an SQL/PL stored procedure using the FEMALEPERSONNEL statement, perform the following steps:
1. Select the Stored Procedures folder, right-click, and select New>Store Procedure.
2. The New Stored Procedure wizard opens. On the Name and Language page, select the project where you want to create this stored procedure in the Project drop-down list. You can use the New button if you want to create a new project. For our example, select the DatabaseJournalProject (as shown in Step 4).
3. Type a name in the Name field; for this example, use SP_FEMALEPERSONNEL (as shown in the next step).
4. Leave the Language field set to SQL (since we are using an SQL statement to build this stored procedure). When you are finished, the New Stored Procedure wizard should look like the following; click Next:
5. On the SQL Statements page, select the default SQL statement, Statement1, and click Remove.
As you can see, IBM Data Studio provides you with a sample SQL statement. You can create a new SQL statement in this wizard (more on that in a bit) or import one (or more).
6. Click Import.
7. The Import SQL Statements window opens. Select the FEMALEPERSONNEL SQL statement. You can see this SQL statement’s DML in the right pane (and the name of the query is shown as [FEMALEPERSONNEL]). Click Import.
The SQL Statements page should now look like this:
8. Click Finish.
There are many other options available in the New Stored Procedure wizard. I cover them in the next article in this series when I show you how to build stored procedures from scratch when an SQL statement doesn’t exist.
As you can see, the SP_FEMALEPERSONNEL stored procedure has been added to the Stored Procedures folder. The code for this SQL/PL procedure is in the SQL Editor that I covered in previous parts of this series.
Now try to locate this stored procedure in the Database Explorer view – I’m willing to bet that you will have difficulties doing so (for good reason):
Notice that you can’t find it? That’s because it hasn’t been built yet! You have to explicitly build the business logic you created (or specify that it be built using an option in the New Stored Procedure wizard that I didn’t cover). Before we build it, let’s look at some other options.