- Las reglas son una característica antigua de SQL Server.
- Esta función se eliminará en una versión futura de Microsoft SQL Server.
. Creo que esta es la razón por la cual
MERGEdeclaración no admite tablas con reglas. - Puedes reemplazar las reglas con comprobar restricciones .
Ejemplo de MERGE (con reglas y con CHECK restricciones):
CREATE RULE MyRule
AS
@Status IN ('Y', 'N');
GO
CREATE TABLE dbo.SalesOrder
(
SalesOrderID INT PRIMARY KEY
,OrderDate DATETIME NOT NULL
,IsDeleted CHAR(1) NOT NULL DEFAULT 'N'
);
GO
EXEC sp_bindrule @rulename='MyRule', @objname='dbo.SalesOrder.IsDeleted';
GO
INSERT dbo.SalesOrder (SalesOrderID, OrderDate)
SELECT 1, '20110101'
UNION ALL
SELECT 2, '20110202'
UNION ALL
SELECT 3, '20110303';
GO
SELECT *
FROM dbo.SalesOrder;
PRINT '*****First test*****';
GO
MERGE dbo.SalesOrder Dst
USING (VALUES (1,'Y'), (4,'Y')) AS Src(SalesOrderID, IsDeleted)
ON Dst.SalesOrderID = Src.SalesOrderID
WHEN MATCHED THEN UPDATE SET IsDeleted = Src.IsDeleted
WHEN NOT MATCHED BY TARGET THEN INSERT (SalesOrderID, OrderDate, IsDeleted) VALUES (Src.SalesOrderID, GETDATE(), Src.IsDeleted);
GO
EXEC sp_unbindrule 'dbo.SalesOrder.IsDeleted'; --Disabling `MyRule` for IsDeleted column
ALTER TABLE dbo.SalesOrder --We "replace" the old rule with a new `CHECK` constraint
ADD CONSTRAINT CK_SalesOrder_IsDeleted CHECK( IsDeleted IN ('Y', 'N') );
GO
PRINT '*****Second test*****';
MERGE dbo.SalesOrder Dst
USING (VALUES (1,'Y'), (4,'Y')) AS Src(SalesOrderID, IsDeleted)
ON Dst.SalesOrderID = Src.SalesOrderID
WHEN MATCHED THEN UPDATE SET IsDeleted = Src.IsDeleted
WHEN NOT MATCHED BY TARGET THEN INSERT (SalesOrderID, OrderDate, IsDeleted) VALUES (Src.SalesOrderID, GETDATE(), Src.IsDeleted);
GO
SELECT *
FROM dbo.SalesOrder;
DROP TABLE dbo.SalesOrder;
DROP RULE MyRule;
Resultados:
Rule bound to table column.
(3 row(s) affected)
SalesOrderID OrderDate IsDeleted
------------ ----------------------- ---------
1 2011-01-01 00:00:00.000 N
2 2011-02-02 00:00:00.000 N
3 2011-03-03 00:00:00.000 N
(3 row(s) affected)
*****First test*****
Msg 358, Level 16, State 1, Line 2
The target table 'Dst' of the MERGE statement cannot have any enabled rules. Found rule 'MyRule'.
Rule unbound from table column.
*****Second test*****
(2 row(s) affected)
SalesOrderID OrderDate IsDeleted
------------ ----------------------- ---------
1 2011-01-01 00:00:00.000 Y
2 2011-02-02 00:00:00.000 N
3 2011-03-03 00:00:00.000 N
4 2011-09-20 16:03:56.030 Y
(4 row(s) affected)
