WITH CHANGE_TRACKING_CONTEXT (Transact-SQL)

Enables the context of a change to be specified, such as an originator ID, when data is changed. For example, when using change tracking, an application might want to differentiate between changes that were made by the application itself and changes that were made to the data outside the application.

Transact-SQL Syntax Conventions

Składnia

WITH CHANGE_TRACKING_CONTEXT ( context )

Parametry

• context
  Is the contextual information that is supplied by the calling application and stored with the change tracking information for the change. context is varbinary(128).

  The value can be a constant or a variable, but cannot be NULL.

Examples

The following example sets the change tracking context for a data change.

-- The tracked change is tagged with the specified context 
DECLARE @originator_id varbinary(128);
SET @originator_id = CAST('MyApplicationID' AS varbinary(128));
WITH CHANGE_TRACKING_CONTEXT (@originator_id)
    UPDATE Employees
      SET Salary = 50000
      WHERE EmpID = 1 
-- The change now has an associated change context
SELECT c.EmpID, c.SYS_CHANGE_CONTEXT 
FROM CHANGETABLE(CHANGES Employees, @last_sync_version) AS c;

Zobacz także

Odwołanie

CHANGETABLE (Transact-SQL)

Koncepcje

Change Tracking Functions (Transact-SQL)

Track Data Changes (SQL Server)