SQL Server判断对像样否存在（整理中.）

1 判断数据库是否存在

if exists (select * from sys.databases where name = '数据库名')   drop database [数据库名]

?2 判断表是否存在

if exists (select * from sysobjects where id = object_id(N'[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)   drop table [表名]

?3 判断存储过程是否存在

if exists (select * from sysobjects where id = object_id(N'[存储过程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)   drop procedure [存储过程名]

?4 判断临时表是否存在

if object_id('tempdb..#临时表名') is not null     drop table #临时表名 

?5 判断视图是否存在

--SQL Server 2000IF EXISTS (SELECT * FROM sysviews WHERE object_id = '[dbo].[视图名]'--SQL Server 2005IF EXISTS (SELECT * FROM sys.views WHERE object_id = '[dbo].[视图名]'

?6 判断函数是否存在

--   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'))    drop function [dbo].[函数名]   

?7 获取用户创建的对象信息

SELECT [name],[id],crdate FROM sysobjects where xtype='U'/*xtype 的表示参数类型，通常包括如下这些C = CHECK 约束D = 默认值或 DEFAULT 约束F = FOREIGN KEY 约束L = 日志FN = 标量函数IF = 内嵌表函数P = 存储过程PK = PRIMARY KEY 约束（类型是 K）RF = 复制筛选存储过程S = 系统表TF = 表函数TR = 触发器U = 用户表UQ = UNIQUE 约束（类型是 K）V = 视图X = 扩展存储过程*/

8 判断列是否存在

if exists(select * from syscolumns where id=object_id('表名') and name='列名')   alter table 表名 drop column 列名

9 判断列是否自增列

if columnproperty(object_id('table'),'col','IsIdentity')=1   print '自增列'else   print '不是自增列'SELECT * FROM sys.columns WHERE object_id=OBJECT_ID('表名')AND is_identity=1

10 判断表中是否存在索引

if exists(select * from sysindexes where id=object_id('表名') and name='索引名')    print   '存在'  else    print   '不存在

11 查看数据库中对象

SELECT * FROM sys.sysobjects WHERE name='对象名'

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