0
第二个ALTER TABLE
CHECK CONSTRAINT
是否在IF (NOT) EXISTS
中,以便该脚本可以重复执行?SQL检查是否运行了“CHECK CONSTRAINT”?
IF NOT EXISTS (
SELECT * FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS
WHERE CONSTRAINT_NAME ='fk_RoleId'
)
BEGIN
ALTER TABLE [dbo].[webpages_UsersInRoles] WITH CHECK ADD CONSTRAINT [fk_RoleId] FOREIGN KEY([RoleId])
REFERENCES [dbo].[webpages_Roles] ([RoleId])
END
GO
-- Put me in an IF ...() BEGIN ... END?
ALTER TABLE [dbo].[webpages_UsersInRoles] CHECK CONSTRAINT [fk_RoleId]
GO
它不会引起任何错误,但如果它应该是在IF
条款,你怎么测试,如果它已经跑了(什么可以如果包含)?
第二步是多余的。请参阅http://stackoverflow.com/questions/529941/whats-the-difference-between-with-check-add-constraint-followed-by-check-constr –