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 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
--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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