Sql Server2008 常用判斷語句（一）

1、判斷是否存在addOneArticle這個存儲過程

if Exists(select name from sysobjects where NAME = 'addOneArticle' and type='P')

drop procedure addOneArticle

2、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

3、判斷是否存在View_1這個視圖

IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME = N'View_1')

DROP View View_1

4、判斷是否存在USER_Fun這個用戶函數

(注意此處的type 有兩種,分別是'TF'-Table-valued Function 表值函數 或'FN'-Scalar-valued Function 標量值函數)

if exists(select * from dbo.sysobjects where id = object_id(N'[dbo].[USER_Fun]') and (type = 'FN' or type = 'TF'))

DROP FUNCTION USER_Fun

5、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

6、判斷數據庫是否存在

if exists( select * from master.dbo.sysdatabases where dbid=db_ID( 'scbjdb' ) )

drop database scbjdb

else

print 'no exist scbjdb'