disable/enable constraints of all user tables

[Moonrider]

the following stored procedure
DISABLES constraints of all user tables :

CREATE PROCEDURE dbo.disable_constraints AS

DECLARE @tabelle varchar(50)
DECLARE tbl_tabellen CURSOR FOR 	
	select [name]
	from sysobjects
	where type = 'U' 

OPEN tbl_tabellen
FETCH NEXT FROM tbl_tabellen INTO @tabelle
WHILE @@fetch_status = 0
begin
    EXEC('ALTER TABLE ' + @tabelle + ' NOCHECK CONSTRAINT ALL')
    PRINT 'disabled constraints of ' + upper(@tabelle)
    FETCH NEXT FROM tbl_tabellen INTO @tabelle
end
CLOSE tbl_tabellen
DEALLOCATE tbl_tabellen
GO

the following stored procedure
ENABLES constraints of all user tables :

CREATE PROCEDURE dbo.enable_constraints AS

DECLARE @tabelle varchar(50)
DECLARE tbl_tabellen CURSOR FOR 	
	select [name]
	from sysobjects
	where type = 'U' 

OPEN tbl_tabellen
FETCH NEXT FROM tbl_tabellen INTO @tabelle
WHILE @@fetch_status = 0
begin
    EXEC('ALTER TABLE ' + @tabelle + ' CHECK CONSTRAINT ALL')
    PRINT 'enabled constraints of ' + upper(@tabelle)
    FETCH NEXT FROM tbl_tabellen INTO @tabelle
end
CLOSE tbl_tabellen
DEALLOCATE tbl_tabellen
GO

have a blessed day