sql server drop talbe 自动删除关联的外键 ,权限体系（一）

 if object_id('Proc_DropTableWithFK') is not null
 begin
drop proc dbo.Proc_DropTableWithFK
 end
GO
create proc  Proc_DropTableWithFK @PK_tableName nvarchar(50)
as
begin
declare test_cur cursor local for
select 
o2.name  as 'FK_name' ,
O3.name as 'Table_Name' from sysforeignkeys  FK  
inner join sys.objects o1 on FK.rkeyid=o1.object_id  
inner join  sys.objects  o2 on FK.constid= o2.object_id
inner join  sys.objects  o3 on FK.fkeyid= o3.object_id
where o1.name=@PK_tableName
open test_cur
declare @FK_name nvarchar(255),@Table_Name nvarchar(255)
fetch next from test_cur into @FK_name,@Table_Name
while @@FETCH_STATUS=0
begin
    exec('ALTER TABLE '+@Table_Name+' DROP CONSTRAINT '+@FK_name)
fetch next from test_cur into @FK_name,@Table_Name
end 
close test_cur
deallocate test_cur
  exec(' drop table '+@PK_tableName)
 end


 
 go
if object_id('Sys_User') is not null
exec dbo.Proc_DropTableWithFK 'Sys_User'
GO
create table Sys_User
(
Sys_UserID int identity(1,1) primary key,
UserAccount nvarchar(255) not null,
UserPwd nvarchar(255) not null,
UserName nvarchar(255) 
)
go
if object_id('Sys_powerTeam') is not null
exec dbo.Proc_DropTableWithFK 'Sys_powerTeam'
go
create table Sys_powerTeam
(
Sys_powerTeamID int identity(1,1),
PowerTeamName nvarchar(255) not null
)
go
if object_id('Sys_PowerTeamForUser') is not null
exec dbo.Proc_DropTableWithFK 'Sys_PowerTeamForUser'
go
create table Sys_PowerTeamForUser
(
Sys_PowerTeamForUserID int identity(1,1) primary key, 
Sys_powerTeamID  int,
Sys_UserID int 
)
go
if object_id('Sys_Menu') is not null
exec dbo.Proc_DropTableWithFK 'Sys_Menu'
go
create table Sys_Menu
(
Sys_MenuID int identity(1,1) primary key,
Url nvarchar(255) ,
ParentId int ,
MenuName nvarchar(255) not null,
OrderNum int 
)
go
if object_id('Sys_PowerTeamForMenu') is not null
exec dbo.Proc_DropTableWithFK 'Sys_PowerTeamForMenu'
go
create table Sys_PowerTeamForMenu
(
Sys_PowerTeamForMenu int identity(1,1) primary key,
Sys_powerTeamID int,
Sys_MenuID int
)
go

这是一个权限体系表结构的建立，没有外键关系。

Proc_DropTableWithFK 这个存储过程 传入要删除的表明，将会查询出他所有的外键表以及外键名称，在把这些集合放在游标里面，循环删除所有外键，最后在删除表。

未完待续。。。