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SQL Server 2000 Stored Procedure Programming
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From Information_Schema.Columns Where Table_Name = 'Equipment' Select Columns_Updated() "COLUMNS UPDATED" Select @intColumn = 1 -- loop through columns while @intColumn <= @intCountColumn begin if Columns_Updated() & @intColumn = @intColumn Print 'Column (' + Cast(@intColumn as varchar) + ') ' + Col_Name('Equipment', @intColumn) + ' has been changed!' End
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Use the following statement to test this trigger:
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Insert Equipment(Make, Model, EqTypeID) Values('Acme', '9000', 1)
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Let s investigate a trigger designed to record the name of the user that changed the status of an order in the ActivityLog table, along with some additional information:
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Create Trigger trOrderStatus_U_1 On dbo.[Order] After Update As declare @intOldOrderStatusId int, @intNewOrderStatusId int If Update (OrderStatusId) Begin select @intOldOrderStatusId = OrderStatusId from deleted select @intNewOrderStatusId = OrderStatusId from inserted -- For Update
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Insert into ActivityLog( Activity, LogDate, UserName, Note) values ( 'Order.OrderStatusId', GetDate(), User_Name(), 'Value changed from ' + Cast( @intOldOrderStatusId as varchar) + ' to ' + Cast((@intNewOrderStatusId) as varchar) ) End
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This method is far from perfect. Can you detect the problem It records the user who has changed the status of an order only when the user changes no more than a single order.
select @intOldOrderStatusId = OrderStatusId from deleted
Let me remind you that if the Select statement returns more than one record, the variable(s) will be filled with values from the last record. This is sometimes all that is required. If the developer has restricted access to the table and the only way to change the status is through a stored procedure (which allows only one record to be modified at a time), then this is sufficient. Unfortunately, there is always a system administrator who can work around any restriction and possibly issue an Update statement that will change the status of all tables. Let s see the proper solution:
Alter Trigger trOrderStatus_U On dbo.[Order] After Update -- For Update As If Update (OrderStatusId) begin Insert into ActivityLog( Activity, LogDate, UserName, Note)
SQL Server 2000 Stored Procedure Programming
Select
'Order.OrderStatusId', GetDate(), User_Name(), 'Value changed from ' + Cast( d.OrderStatusId as varchar) + ' to ' + Cast( i.OrderStatusId as varchar)
from deleted d inner join inserted i on d.OrderId = i.OrderId end
In this case, a set operation is used and one or more records from the deleted and inserted tables will be recorded in the ActivityLog.
Nested and Recursive Triggers
A trigger can initiate triggers on the same or other tables when it inserts, updates, or deletes records in them. This technique is called nesting triggers. If a trigger changes records in its own table, it can fire another instance of itself. Such an invocation is called direct invocation of recursive triggers. There is another scenario in which recursive invocation of triggers might occur. The trigger on one table might fire a trigger on a second table. The trigger on the second table might change the first table again, and the first trigger will fire again. This scenario is called indirect invocation of recursive triggers. All these scenarios might be ideal for implementing referential integrity and business rules, but they might also be too complicated to design, understand, and manage. If you are not careful, the first trigger might call the second, then the second might call the first, then the first the second, and so on. Very often, the SQL Server environment is configured to prevent this kind of behavior. To disable nested triggers and recursive triggers, you need to use the stored procedure sp_configure to set the Nested Triggers server option and the Alter Table statement to set the Recursive_Triggers option to off mode. Keep in mind that recursive triggers will be disabled automatically if you disable nested triggers.
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Trigger Restrictions
The trigger must be created as the first statement in a batch. The name of the trigger is its Transact-SQL identifier, and it therefore must be no more than 128 characters long. The trigger s name must be unique in the database. A trigger can only be associated with one table, but one table can be associated with many triggers. In the past, only one trigger could be associated with one modification statement on one table. Now, each feature of the system can be implemented in a separate trigger. By implementing these features in separate triggers, you assure that the triggers will be easier to understand and manage. Triggers cannot be nested more than 32 times, nor can they be invoked recursively more than 32 times. Attempting to do so causes SQL Server to return an error. A trigger must not contain any of following Transact-SQL statements: Alter Database Alter Procedure Alter Table Alter Trigger Alter View Create Database Create Default Create Index Create Procedure Create Rule Create Schema Create Table Create Trigger Create View Deny Disk Init Disk Resize Drop Database Drop Default Drop Index Drop Procedure Drop Rule Drop Table Drop Trigger Drop View Grant Load Database Load Log Reconfigure Restore Database Restore Log Revoke Truncate Table Update Statistics
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