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SQL Server nonchalantly prints from the trigger:
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One or more rows are deleted in Equipment table!
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Let s investigate a complete syntax for triggers in SQL Server 7.0. After triggers in SQL Server 2000 have the same syntax except that the keyword For could be replaced with After.
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Special Types of Procedures
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Create Trigger trigger_name On table [With Encryption] { {For { [Delete] [,] [Insert] [,] [Update] } [With Append] [Not For Replication] As
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sql_statement [...n]
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} | {For { [Insert] [,] [Update] } [With Append] [Not For Replication] As { If Update (Column) [{And | Or} Update (Column)] [...n] | If (Columns_Updated() {bitwise_operator}
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updated_bitmask)
{ comparison_operator} column_bitmask [...n] }
sql_statement [ ...n]
If a trigger is defined with the With Encryption clause, SQL Server encrypts it so that its code remains concealed. Keep in mind that you need to preserve the source code in a script outside SQL Server if you plan to modify it later. The Not For Replication clause indicates that SQL Server should not fire a trigger during replication of the table. The With Append clause is used only when the compatibility mode of SQL Server is set to a value less then 70. For more details, refer to SQL Server Books Online. It is possible to determine which columns were updated during the Insert or Update operation. Transact-SQL includes two functions that you can use within the trigger \UPDATE and COLUMNS_UPDATED.
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If Update (column)
sql_statement [ ...n]
If (Columns_Updated() {bitwise_operator} updated_bitmask) {comparison_operator} column_bitmask [...n]
sql_statement [ ...n]
We can now modify our previously used trigger to update only the fields that were updated:
Alter Trigger trEquipment_IU On dbo.Equipment After Insert, Update As -- precalculate ModelSDX and MakeSDX field -- to speed up use of SOUNDEX function if Update(Model) update Equipment Set ModelSDX = SOUNDEX(Model) where EquipmentId IN (Select EquipmentId from Inserted) if Update(Make) update Equipment Set MakeSDX = SOUNDEX(Make) where EquipmentId IN (Select EquipmentId from Inserted) go -- For Insert, Update
The Update() function might not perform exactly as you expect. In fact, it returns True for columns that were referenced during the Transact-SQL statement, rather than for columns that were actually changed. For example, if you issue the following update statement, SQL Server references the Make column of all records and the trigger recalculates the SOUNDEX code in all records:
Update Equipment Set Make = Make
This behavior might cause some problems for you if you forget about it. However, in some cases, you can use it to your advantage. For example, to speed up the upload of information to the table, you can temporarily
9:
Special Types of Procedures
disable triggers (see the Disabling Triggers section later in this chapter). Later, when you want to execute the triggers (for example, to verify their validity and/or perform additional activities), you can use this feature to initiate triggers for records that are present in the table.
TIP: Too often, developers forget that the presence of a default constraint in a column causes the Update() function to return True for that column during the execution of the Insert statement. This will occur even if the Insert statement did not reference the column itself.
The Columns_Updated() function operates with a bitmap that is related to the positions of columns. You can investigate its contents if you use an integer bitmask. To test whether the third column in a table was updated, you can use:
if Columns_Updated() & 3 = 3 print 'Column 3 was updated!'
The ampersand (&) is a binary and operator and you can test the value of the flag using it. Naturally, hard-coding the order of columns does not make much sense. The real value of this function is as a means of looping through all the columns that were updated and performing specified actions. The following trigger loops through columns and displays which ones were updated:
Create Trigger trEquipment_IU_2 -- list all columns that were changed On dbo.Equipment after Insert, Update As Set Nocount Off declare @intCountColumn int, @intColumn int -- count columns in the table Select @intCountColumn = Count(Ordinal_position) -- For Insert, Update
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