代码:
- --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
- --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'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'