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Instead-of triggers are executed instead of the modification statement that has initiated them. The following trigger is executed when anybody attempts to delete records from the MyEquipment table. It will report an error instead of allowing the deletion:

Create Trigger itrMyEquipment_D On dbo.MyEquipment instead of Delete As -- deletion in this table is not allowed raiserrror(60012, 16, 1) GO

One sign of a well-designed database system is that it prevents users from directly accessing the tables and forces them to use stored procedures to perform specific functions. It is also easier to manage a set of stored procedures by functionality than to manage table- and column-level permissions.

1:

Instead-of triggers are executed after changes to base tables occur in Inserted and Deleted virtual tables, but before any change to the base tables is executed. Therefore, the trigger can use information in the Inserted and Deleted tables. In the following example, a trigger tests whether some of the records that would have been deleted are in use in the Equipment table:

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Create Trigger itrEqType_D On dbo.EqType instead of Delete As If exists(select * from Equipment where EqTypeId in (select EqTypeId from deleted) ) raiserror('Some recs in EqType are in use in Equipment table!', 16, 1) else delete EqType where EqTypeId in (select EqTypeId from deleted) GO

Instead-of triggers are initiated before any constraints. This behavior is very different from that of after triggers. Therefore, the code for an instead-of trigger must perform all checking and processing that would normally be performed by constraints. Usually, an instead-of trigger executes the modification statement (Insert, Update, or Delete) that initiates it. The modification statement does not initiate the trigger again. If there are some after triggers and/or constraints defined on the table or view, they will be executed as though the instead-of trigger does not exist. A table or a view can have only one instead-of trigger (and more than one after trigger).

Instead-of triggers can be defined on views also. In the following example, a trigger is created on a view that displays fields from two tables:

Create View dbo.vEquipment AS Select Equipment.EquipmentId, Equipment.Make, Equipment.Model, EqType.EqType From Equipment Inner Join EqType On Equipment.EqTypeId = EqType.EqTypeId Go Create Trigger itr_vEquipment_I On dbo.vEquipment instead of Insert As -- If the EQType is new, insert it If exists(select EqType from inserted where EqType not in (select EqType from EqType)) -- we need to insert the new ones

9:

IN THIS CHAPTER:

insert into EqType(EqType) select EqType from inserted where EqType not in (select EqType from EqType) -- now you can insert new equipment Insert into Equipment(Make, Model, EqTypeId) Select inserted.Make, inserted.Model, EqType.EqTypeId From inserted Inner Join EqType On inserted.EqType = EqType.EqType GO Insert Into vEquipment(EquipmentId, Make, Model, EqType) Values (-777, 'Microsoft', 'Natural Keyboard', 'keyboard')

The trigger first examines whether the Inserted table contains EqType values that do not exist in EqTable. If they exist, they will be inserted in the EqType table. At the end, values from the Inserted table are added to the Equipment table. The previous example illustrates one unusual feature in the use of instead-of triggers on views. Since EquipmentId is referenced by the view, it can (and must) be specified by the modification statement (Insert statement). The trigger can (and will) ignore the specified value since it is inserted automatically (EquipmentId is an identity field in the base table). The reason for this behavior is that the Inserted and Deleted tables have different structures from the base tables on which the view is based. They have the same structure as the Select statement inside the view. Columns in the view can be nullable or not nullable. The column is nullable if its expression in the select list of the view satisfies one of the following criteria:

The view column references a base table column that is nullable. The view column expression uses arithmetic operators or functions.

As -- read next Id Select @intId = SequenceNumber From SequenceNumbers (updlock) Where Tablename = 'a table' -- increment SequenceNumber Update SequenceNumbers Set SequenceNumber = @intId + 1 Where Tablename = 'a table' Return

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