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Special Types of Procedures
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+ Cast( i.OrderStatusId as varchar) From deleted d inner join inserted i On d.OrderId = i.OrderId If @@Error <> 0 Begin RAISERROR ("Error in trOrderStatus_U", 16, 1) Rollback Transaction End End
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In this trigger, SQL Server investigates the presence of the error and rolls back the complete operation if it is unable to log changes to the OrderStatusId field. The processing of Rollback Transaction inside a trigger differs from its processing inside a stored procedure. It also differs in different versions of Microsoft SQL Server. When a Rollback statement is encountered in a stored procedure, changes made since the last Begin Transaction are rolled back, but the processing continues. In Microsoft SQL Server 2000 and SQL Server 7.0, when a Rollback statement is executed within a trigger, a complete batch is aborted and all changes are rolled back. SQL Server continues to process from the beginning of the next batch (or stops if the next batch does not exist). Microsoft SQL Server 4.2 and all versions of Sybase SQL Server behaved in this manner. In version 6.0, execution was continued through the trigger, but the batch was canceled. Version 6.5 went to an opposite extreme. Execution of both the trigger and the batch was continued. It was the responsibility of the developer to detect an error and stop further processing.
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Using Triggers
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In SQL Server, triggers may have the following roles:
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To enforce data integrity (referential integrity, cascading deletes)
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SQL Server 2000 Stored Procedure Programming
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To enforce complex business rules (complex defaults and checks) To log changes and send notification to administrators (e-mail) To maintain derived information (calculated columns, running totals, aggregates)
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Triggers can be implemented to replace all other constraints on a table. A typical example is the use of a trigger to replace the functionality enforced by a foreign key constraint. It is possible to implement cascading deletes using triggers. For example, if we do not have a foreign key between the Inventory and InventoryProperty tables, we might implement a trigger to monitor the deletion of Inventory records and to delete all associated InventoryProperty records. Check and default constraints are limited in that they can base their decision only on the context of current records in the current tables. You can implement a trigger that will function in a manner similar to check constraints that bases its verification on the contents of multiple records or even on the contents of other tables. Triggers can be set to create an audit trail of activities performed on a table. For example, we might be interested in obtaining information on who changed the contents or specific columns in the Lease table, and when that user made the changes. It is possible to create a trigger to notify the administrator when a specific event occurs in the database. For example, in a service database, we might send e-mail to a person responsible for dispatching technical staff informing that person that a request for technical support has been received in the database. In certain inventory systems, we might automatically generate an order if the quantity of a selected type of equipment or spare part falls below a specified level. Triggers are suitable for computing and storing calculated columns, running totals, and other aggregations in the database. For example, to speed up reporting, you might decide to keep a total of ordered items in an order table.
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9:
Special Types of Procedures
Cascading Deletes
Usually, referential integrity between two tables is implemented with a foreign key. In the following illustration, you can see two tables that are linked in such a manner:
In such cases, a foreign key will prevent the user from deleting records from a referenced table (Inventory) if a record is referenced in a linked table (InventoryProperty). The only way to delete the record would be to use the following code:
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