SQL Server判断对象是否存在
1 判断数据库是否存在 Sql代码
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 Sql代码
if exists (select * from sysobjects where id = object_id('表名') and objectproperty(id,'IsUserTable') = 1) drop table [表名]
if exists (select * from sysobjects where name = '表名' and xtype = 'U') drop table [表名]
3 判断存储过程是否存在 Sql代码
if exists (select * from sysobjects where id = object_id('[存储过程名]') and objectproperty(id, 'IsProcedure') = 1) drop procedure [存储过程名]
if exists (select 1 from sysobjects where name = '存储过程名' and xtype = 'P') drop procedure [存储过程名]
4 判断临时表是否存在 Sql代码
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代码
--SQL Server 2000
IF EXISTS (SELECT * FROM sysviews WHERE object_id = '[dbo].[视图名]')
--SQL Server 2005
IF EXISTS (SELECT * FROM sys.views WHERE object_id = '[dbo].[视图名]')
6 判断函数是否存在 Sql代码
-- 判断要创建的函数名是否存在
if exists (select * from dbo.sysobjects where id = object_id('[dbo].[函数名]') and xtype in ('FN', 'IF', 'TF'))
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drop function [dbo].[函数名]
if exists (select 1 from sysobjects where name = '函数名' and xtype in('FN','IF','TF')) drop function [函数名]
7 获取用户创建的对象信息 Sql代码
SELECT 1 FROM sysobjects where name = [对象名] and xtype='' /*
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 Sql代码
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 Sql代码
if columnproperty(object_id('table'),'col','IsIdentity')=1 print '自增列' else
print '不是自增列'
SELECT * FROM syscolumns WHERE object_id=OBJECT_ID('表名') AND is_identity=1
10 判断表中是否存在索引 Sql代码
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 Sql代码
SELECT * FROM sys.sysobjects WHERE name='对象名'
12 查看表中主键是否存在,如存在则将其drop掉 declare @pk varchar(100)
select @pk=name from sysobjects where parent_obj=object_id('表名') and xtype='PK' if @pk is not null
exec('alter table 表名 drop '+ @pk)