T SQL建立前刪除已存在儲存過程

--判斷是否存在addonearticle這個儲存過程

if exists(select name from sysobjects where name = 'addonearticle' and type='p')

drop procedure addonearticle

--判斷是否存在countar這個觸發器

if exists(select * from dbo.sysobjects where id = object_id(n'[dbo].[countar]') and objectproperty(id, n'istrigger') = 1)

drop trigger countar

--判斷是否存在view_1這個檢視

if exists (select table_name from information_schema.views where table_name = n'view_1')

drop view view_1

--判斷是否存在user_fun這個使用者函式(注意此處的type 有兩種,分別是'tf'-table-valued function 錶值函式或'fn'-scalar-valued function 標量值函式)

if exists(select * from dbo.sysobjects where id = object_id(n'[dbo].[user_fun]') and (type = 'fn' or type = 'tf'))

drop function user_fun

--判斷表'tb'是否存在

if (exists (select * from dbo.sysobjects where id = object_id(n'tb')and objectproperty(id, n'isusertable') = 1))

drop table tb