These procedures are very useful when you need to load bulk data and you know the data is correct -- but you do not need the foreign keys and check constraints to interfere. You might also use them when you want to change key values and don't want the constraints to get in your way.
So, the following procedure will disable/enable all constraints for a given parametric table:
CREATE PROCEDURE sp_ConstraintState @TblName VARCHAR(128), @State BIT = 1 AS DECLARE @SQLState VARCHAR(500) IF @State = 0 BEGIN SET @SQLState = 'ALTER TABLE '+ @TblName + ' NOCHECK CONSTRAINT ALL' END ELSE BEGIN SET @SQLState = 'ALTER TABLE ' + @TblName + ' CHECK CONSTRAINT ALL' END EXEC (@SQLState) go
exec sp_ConstraintState 'products',0
...will disable all constraints on the products table in the Northwind database.
The following procedure will use sp_constraintState to disable all constraints in the database:
Create proc sp_disable_all_const_in_db as 'exec sp_MsForEachTable 'sp_ConstraintState ''?'',0 goFor example, to disbale all constraints in the database:
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This was first published in February 2005