sql下用了判斷各種資源是否存在的代碼，很實用。需要的朋友可以參考下。
ｓｑｌ判斷是否存在
–判斷數(shù)據(jù)庫是否存在
if exists(select * from master..sysdatabases where name=N’庫名’)
print ‘exists’
else
print ‘not exists’
—————
— 判斷要創(chuàng)建的表名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[表名]’) and OBJECTPROPERTY(id, N’IsUserTable’) = 1)
— 刪除表
drop table [dbo].[表名]
GO
—————
–判斷要創(chuàng)建臨時表是否存在
If Object_Id(‘Tempdb.dbo.#Test’) Is Not Null
Begin
print ‘存在’
End
Else
Begin
print ‘不存在’
End
—————
— 判斷要創(chuàng)建的存儲過程名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存儲過程名]’) and OBJECTPROPERTY(id, N’IsProcedure’) = 1)
— 刪除存儲過程
drop procedure [dbo].[存儲過程名]
GO
—————
— 判斷要創(chuàng)建的視圖名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[視圖名]’) and OBJECTPROPERTY(id, N’IsView’) = 1)
— 刪除視圖
drop view [dbo].[視圖名]
GO
—————
— 判斷要創(chuàng)建的函數(shù)名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函數(shù)名]’) and xtype in (N’FN’, N’IF’, N’TF’))
— 刪除函數(shù)
drop function [dbo].[函數(shù)名]
GO
if col_length(‘表名’, ‘列名’) is null
print ‘不存在’
select 1 from sysobjects where id in (select id from syscolumns where name=’列名’) and name=’表名’
