sqlserver 各种判断是否存在(表名、函数、存储过程等)

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 
--------------- 
-----列是否存在 
 IF COL_LENGTH( '表名','列名') IS NULL
    PRINT 'not exists'
ELSE
 PRINT 'exists'
alter table 表名 drop constraint 默认值名称 
go 
alter table 表名 drop column 列名 
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 sysobjects where xtype='fn' and name='函数名') 
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'

详细出处参考：http://www.jb51.net/article/34060.htm