Sql 判断函数是否存在、sql判断表是否存在、sql判断存储过程是否存在、sql判断视图是否存在

--数据库是否存在
IF  exists(SELECT  * FROM  master..sysdatabases WHERE  name=N\'库名\')
PRINT  \'exists\'
ELSE 
PRINT  \'not exists\'
---------------
-- 判断要创建的表名是否存在
IF  exists (SELECT * FROM dbo.sysobjects WHERE id = object_id(N\'[dbo].[表名]\') and OBJECTPROPERTY(id, N\'IsUserTable\') = 1)
-- 删除表
DROP TABLE [dbo].[表名]
GO

---------------
--判断要创建临时表是否存在
IF Object_Id(\'Tempdb.dbo.#Test\') Is Not Null
Begin
    PRINT \'存在\'
End
Else
Begin
    PRINT \'不存在\'
END

---------------
-- 判断要创建的存储过程名是否存在
IF exists (SELECT * FROM dbo.sysobjects WHERE id = object_id(N\'[dbo].[存储过程名]\') and OBJECTPROPERTY(id, N\'IsProcedure\') = 1)
-- 删除存储过程
DROP procedure [dbo].[存储过程名]
GO
---------------
-- 判断要创建的视图名是否存在
IF exists (SELECT * FROM dbo.sysobjects WHERE id = object_id(N\'[dbo].[视图名]\') and OBJECTPROPERTY(id, N\'IsView\') = 1)
-- 删除视图
DROP VIEW [dbo].[视图名]
GO
---------------
-- 判断要创建的函数名是否存在
IF exists (SELECT * FROM dbo.sysobjects WHERE id = object_id(N\'[dbo].[函数名]\') and xtype in (N\'FN\', N\'IF\', N\'TF\'))
-- 删除函数
DROP FUNCTION  [dbo].[函数名]
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\'

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