代码：
rush:
sql;">
--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'
ｓｑｌ判断是否存在
rush:
sql;">
--判断
数据库是否存在
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
--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 dbo.sysobjects where id = object_id(N'[dbo].[函数名]') and xtype in (N'FN',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'
