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sp_check_for_sync_trigger (Transact-SQL)

  • Artikkeli

Applies to: SQL Server Azure SQL Managed Instance

Determines whether a user-defined trigger or stored procedure is being called in the context of a replication trigger, which 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.

Transact-SQL syntax conventions

Syntax

sp_check_for_sync_trigger
    [ @tabid = ] tabid
    [ , [ @trigger_op = ] 'trigger_op' OUTPUT ]
    [ , [ @fonpublisher = ] fonpublisher ]
[ ; ]

Arguments

[ @tabid = ] tabid

The object ID of the table being checked for immediate updating triggers. @tabid is int, with no default.

[ @trigger_op = ] 'trigger_op' OUTPUT

Specifies if the output parameter is to return the type of trigger it's being called from. @trigger_op is an OUTPUT parameter of type 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 of 0.

  • If 0, the execution is at the Subscriber.
  • If 1, the execution is at the Publisher.

Return code values

0 indicates that the stored procedure isn't being called within the context of an immediate-updating trigger. 1 indicates that it's being called within the context of an immediate-updating trigger and is the type of trigger being returned in @trigger_op.

Remarks

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's 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 doesn't fire when the replication trigger updates the table.

Examples

A. Add code to a trigger on a Subscriber table

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;

B. Add code to a trigger on a Publisher table

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 extra 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

Any user with SELECT permissions in the sys.objects system view can execute sp_check_for_sync_trigger.

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