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SQL Server 2000 Stored Procedure Programming
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If the column does not allow nulls, an Insert statement must provide a value for it. This is the reason we needed to provide a value for EquipmentId column in the previous example. An Update statement must provide values for all non-nullable columns referenced by the Set clause in a view with an instead-of update trigger.
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NOTE: You must specify values even for view columns that are mapped to timestamp, identity, or computed base table columns.
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You can use the AllowNull field of the COLUMN_PROPERTY function (table function) to examine which fields are nullable from code.
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NOTE: The previous example is much more important than you might think. It allows you to insert a whole set of records at one time into the view (actually to the set of base tables behind the view). Before instead-of triggers, we had to do this record by record with a stored procedure. This capability is very useful for loading information into a SQL Server database. For example, you can load information from a denormalized source (such as a flat file) and store it in a set of normalized, linked tables.
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Another unusual feature of instead-of triggers is the fact that they support text, ntext, and image columns in Inserted and Deleted tables. After triggers cannot handle such values. In base tables, text, ntext, and image columns actually contain pointers to the pages holding data. In Inserted and Deleted tables, text, ntext, and image columns are stored as continuous strings within each row. No pointers are stored in these tables, and therefore the use of the TEXTPTR and TEXTVALID functions and the Readtext, Updatetext, and Writetext statements is not permitted. All other uses, such as references in the Select list or Where clause, or use of CHARINDEX, PATINDEX, or SUBSTRING functions, are valid.
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Trigger Order of Execution
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SQL Server 7.0 introduced the idea that more than one trigger could be created per modification statement. However, the execution
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Special Types of Procedures
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order of such triggers could not be controlled. In SQL Server 2000, it possible to define which after trigger to execute first and which to execute last against a table. For example, the following statement will set trInventory_I to be the first trigger to be executed in the case of an Insert modification statement:
Exec sp_settriggerorder @triggername = 'trInventory_I', @order = 'first'
The @order parameter must have one of these values: first , last , or none . The value none is used to reset the order of the execution of the trigger after it has been specified. Since only one instead-of trigger can be associated with a table, and since it is executed before any other trigger (or constraint), it is not possible to set its order. Alter Trigger statements reset the order of the trigger. After altering the trigger, you must execute the sp_settriggerorder statement to set it again. Replications generate the first trigger for any table that is a queued or an immediate subscriber. SQL Server reports an error if you try to set your trigger to be the first instead. It will also report an error if you try to make a table with a first trigger queued or an immediate subscriber.
Managing Triggers
You can manage triggers using GUI tools such as Enterprise Manager, Query Analyzer Object Browser, or Visual Database Tools. Other methods include using Transact-SQL statements within tools like Query Analyzer.
Managing Triggers in Enterprise Manager
You can access triggers from Enterprise Manager by right-clicking the table with which the trigger is associated. Select All Tasks, then Manage Triggers from the cascading pop-up menus (see Figure 9-10). SQL Server displays a modal form for editing trigger properties. This editor is very similar to the editor you use to edit stored procedures (see Figure 9-11).
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