介紹sql下用了判斷各種資源是否存在的代碼，需要的朋友可以參考下，希望對(duì)您學(xué)習(xí)sql的函數(shù)及數(shù)據(jù)庫(kù)能夠有所幫助。
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-- 庫(kù)是否存在
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if exists(select * from master..sysdatabases where name=N'庫(kù)名')
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print 'exists'
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else
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print 'not exists'
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-- 判斷要?jiǎng)?chuàng)建的表名是否存在
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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
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-- 刪除表
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drop table [dbo].[表名]
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GO
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--判斷要?jiǎng)?chuàng)建臨時(shí)表是否存在
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If Object_Id('Tempdb.dbo.#Test') Is Not Null
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Begin
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print '存在'
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End
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Else
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Begin
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print '不存在'
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End
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-- 判斷要?jiǎng)?chuàng)建的存儲(chǔ)過程名是否存在
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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存儲(chǔ)過程名]') andOBJECTPROPERTY(id, N'IsProcedure') = 1)
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-- 刪除存儲(chǔ)過程
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drop procedure [dbo].[存儲(chǔ)過程名]
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GO
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-- 判斷要?jiǎng)?chuàng)建的視圖名是否存在
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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[視圖名]') and OBJECTPROPERTY(id, N'IsView') = 1)
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-- 刪除視圖
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drop view [dbo].[視圖名]
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GO
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-- 判斷要?jiǎng)?chuàng)建的函數(shù)名是否存在
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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'))
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-- 刪除函數(shù)
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drop function [dbo].[函數(shù)名]
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GO
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if col_length('表名', '列名') is null
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print '不存在'
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select 1 from sysobjects where id in (select id from syscolumns where name='列名') and name='表名'