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Alter Trigger trOrderStatus_U On dbo.[Order] After Update As Print 'Start of trOrderStatus_U' If @@Rowcount = 0 Return If Update (OrderStatusId) Begin Insert into ActivityLog( Activity, LogDate, UserName, Note) Select 'Order.OrderStatusId', GetDate(), USER_NAME(), 'Value changed from ' + Cast( d.OrderStatusId as varchar) -- This is always true -- and the rest will NEVER be executed. -- For Update

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+ ' to ' + Cast( i.OrderStatusId as varchar) From deleted d inner join inserted i On d.OrderId = i.OrderId End

It is true that triggers are suitable for implementing complex business rules, particularly if those business rules are too complex to be handled by simpler database objects such as constraints. However, just because you are using them to handle complex business rules, you do not have to make your code so complex that it is difficult to understand and follow. It is challenging enough to work with triggers: keep them as simple as possible.

In earlier versions of Microsoft SQL Server, only one trigger per modification statement could be associated with a table. This physical restriction led developers to produce poor code. Features that were not related had to be piled up in a single trigger. However, this restriction no longer applies. There is no reason to couple the code for multiple triggers. Each distinct piece of functionality can be implemented in a separate trigger.

Figure 7-2

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The Print and Select commands are very useful in triggers during the debugging process. However, they can be very dangerous if left in a trigger after it has been introduced into production. These statements generate additional resultsets, which might cause the client application to fail if it is not able to handle them or does not expect them.

If you can implement the required functionality using constraints, do not use triggers!

If you can implement the required functionality using stored procedures, and if you can prevent users from accessing your tables directly, do not use triggers! Triggers are more difficult to implement, debug, and manage. You will save both time and money for your company or your client if you can find simpler ways to implement the required functionality.

its variable settings from an Initialization file and then runs in a hands-free mode until completion. The files are divided into sets for simplicity and are included with the SQL Server CD. There are a total of six command files and five initialization files, which are described in the following table: SQL70INS.BAT with SQL70INS.ISS SQL70CST.BAT with SQL70CST.ISS SQL70CLI.BAT with SLQ70CLI.ISS DESKEINS.BAT with DESKEINS.ISS Performs a Typical installation of SQL Server. Performs a Custom installation of SQL Server (defaults to Typical components). Installs the Server Management Tools only. Performs a Desktop version Typical installation of SQL Server. This is the file set required to automatically install SQL Server on a Windows 9.x operating system. Performs a Desktop version Custom (defaults to Typical components) installation of SQL Server. This is the file set required to automatically install SQL Server on a Windows 9.x operating system. Performs an unattended uninstall of SQL Server. You must include the installation path in the command line in order to use this command file.

A trigger is always part of the transaction that initiates it. That transaction can be explicit (when SQL Server has executed BEGIN TRANSACTION). It can also be implicit basically SQL Server treats each Transact-SQL statement as a separate transaction that will either succeed completely or fail completely. It is possible to abort the transaction from inside the trigger using ROLLBACK TRANSACTION. This command is valid for both implicit and explicit transactions.

Alter Trigger trOrderStatus_U On dbo.[Order] After Update As If @@Rowcount = 0 Return If Update (OrderStatusId) Begin Insert into ActivityLog( Activity, LogDate, UserName, Note) Select 'Order.OrderStatusId', GetDate(), USER_NAME(), 'Value changed from ' + Cast( d.OrderStatusId as varchar) + ' to ' --For Update

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