Database programming with C by Carsten Thomsen

By Carsten Thomsen

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2. Expand the UserMan database on your database server. 3. Expand the Tables node. 4. Right-click the table for which you want to create a trigger and select New Trigger from the pop-up menu. This brings up the trigger text editor, which is more or less the same editor you use for your C# code (see Figure 6-12). Figure 6-12. Trigger editor with default template In the trigger editor, you can see that the template automatically names a new trigger Trigger1 prefixed with the name of the table. Actually, if another trigger with this name already exists, the new trigger is named Trigger2, and so on.

NOTE The example code shown in this section is SQL Server only, but if you take a look at the accompanying example code, you’ll see that Oracle after triggers work almost the same as SQL Server triggers, although the syntax is different. NET Data Provider. 45. Why Use a Trigger? Triggers are automatic, so you don’t have to apply the business logic in your code. Here’s a perfect situation for a business rule: you need to check if a member of an organization has paid his or her annual fee and therefore is allowed to order material from the organization’s library.

This can be done using the Server Manager that comes with SQL Server, but I’ll use the Server Explorer. Here’s how you create a trigger for the example UserMan database: 1. Open up the Server Explorer window. 2. Expand the UserMan database on your database server. 3. Expand the Tables node. 4. Right-click the table for which you want to create a trigger and select New Trigger from the pop-up menu. This brings up the trigger text editor, which is more or less the same editor you use for your C# code (see Figure 6-12).

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