删除默认约束存储过程及增加、修改、删除字段代码,JS代码库,德仔网

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【JS】删除默认约束存储过程及增加、修改、删除字段

作者:rock870210 / 发布于2014/6/26/ 806


	---创建删除默认约束的存储过程（以前网上找的，不知道具体出处）
	if exists (select * from sysObjects where name='Pro_DropColumnDFConstraint' and xtype='P')
	drop proc Pro_DropColumnDFConstraint
	go
	create proc Pro_DropColumnDFConstraint
	@tablename VARCHAR(100),
	@columnname VARCHAR(100)
	AS
	declare @tab VARCHAR(100)
	declare @defname varchar(100)
	declare @cmd varchar(100)
	select @defname = name FROM sysobjects so JOIN sysconstraints sc ON so.id = sc.constid
	WHERE object_name(so.parent_obj) = @tablename AND so.xtype = 'D'
	AND sc.colid =(SELECT colid FROM syscolumns
	WHERE id = object_id(@tablename) AND name = @columnname)
	select @cmd='alter table '+ @tablename+ ' drop constraint '+ @defname
	if @cmd is null
	 print 'No default constraint to drop'
	exec (@cmd)
	go

	

	----删除Plans_ID列及默认约束
	exec Pro_DropColumnDFConstraint 'Property','Plans_ID'
	ALTER TABLE Property DROP COLUMN Plans_ID

	--为表PlanProperty添加列PP_IsDisplay
	alter table PlanProperty add PP_IsDisplay tinyint default 0 not null

	--修改列

	alter table PlanProperty alter column PP_IsDisplay int

试试其它关键字

　删除默认约束　　存储过程　

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