SQL Server判断对象是否存在 (if exists (select * from sysobjects )()
1 判断数据库是否存
Sql代码
if exists (select from sys.databases where name = ’数据库名)
drop database [数据库名] 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
Sql代码
if exists (select from sysobjects where id = object_id(N’[表名]) and OBJECTPROPERTY(id, N’IsUserTable) = 1)
drop table [表名] 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
Sql代码
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] 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
Sql代码
if object_id(’tempdb..#临时表名) is not null
drop table #临时表名 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] --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
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] -- 判断要创建的函数名是否存
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
Sql代码
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
P = 存储过程
PK = PRIMARY KEY 约束（类型是 K
RF = 复制筛选存储过
S = 系统
TF = 表函
TR = 触发
U = 用户
UQ = UNIQUE 约束（类型是 K
V = 视图
X = 扩展存储过程
/ 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
P = 存储过程
PK = PRIMARY KEY 约束（类型是 K
RF = 复制筛选存储过
S = 系统
TF = 表函
TR = 触发
U = 用户
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
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 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 sys.columns WHERE object_id=OBJECT_ID(’表名)
AND is_identity=1 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
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 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 SELECT FROM sys.sysobjects WHERE name=’对象名
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