sp_check_for_sync_trigger (Transact-SQL)
Determines whether a user-defined trigger or stored procedure is being called in the context of a replication trigger that is used for immediate updating subscriptions. This stored procedure is executed at the Publisher on the publication database or at the Subscriber on the subscription database.
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Transact-SQL Syntax Conventions
Składnia
sp_check_for_sync_trigger [ @tabid = ] 'tabid'
[ , [ @trigger_op = ] 'trigger_output_parameters' OUTPUT ]
[ , [ @fonpublisher = ] fonpublisher ]
Arguments
[@tabid = ] 'tabid'
Is the object ID of the table being checked for immediate updating triggers. tabid is int with no default.[@trigger_op = ] 'trigger_output_parameters' OUTPUT
Specifies if the output parameter is to return the type of trigger it is being called from. trigger_output_parameters is char(10) and can be one of these values.Value
Description
Ins
INSERT trigger
Upd
UPDATE trigger
Del
DELETE trigger
NULL (default)
[ @fonpublisher = ] fonpublisher
Specifies the location where the stored procedure is executed. fonpublisher is bit, with a default value of 0. If 0, the execution is at the Subscriber, and if 1, the execution is at the Publisher.
Return Code Values
0 indicates that the stored procedure is not being called within the context of an immediate-updating trigger. 1 indicates that it is being called within the context of an immediate-updating trigger and is the type of trigger being returned in @trigger\_op.
Uwagi
sp_check_for_sync_trigger is used in snapshot replication and transactional replication.
sp_check_for_sync_trigger is used to coordinate between replication and user-defined triggers. This stored procedure determines if it is being called within the context of a replication trigger. For example, you can call the procedure sp_check_for_sync_trigger in the body of a user-defined trigger. If sp_check_for_sync_trigger returns 0, the user-defined trigger continues processing. If sp_check_for_sync_trigger returns 1, the user-defined trigger exits. This ensures that the user-defined trigger does not fire when the replication trigger updates the table.
Przykład
The following example shows code that could be used in a trigger on a Subscriber table.
DECLARE @retcode int, @trigger_op char(10), @table_id int
SELECT @table_id = object_id('tablename')
EXEC @retcode = sp_check_for_sync_trigger @table_id, @trigger_op OUTPUT
IF @retcode = 1
RETURN
The code can also be added to a trigger on a table at the Publisher; the code is similar, but the call to sp_check_for_sync_trigger includes an additional parameter.
DECLARE @retcode int, @trigger_op char(10), @table_id int, @fonpublisher int
SELECT @table_id = object_id('tablename')
SELECT @fonpublisher = 1
EXEC @retcode = sp_check_for_sync_trigger @table_id, @trigger_op OUTPUT, @fonpublisher
IF @retcode = 1
RETURN
Permissions
sp_check_for_sync_trigger stored procedure can be executed by any user with SELECT permissions in the sys.objects system view.