查询与删除MSSQL中所有外键约束

查询：

SELECT 主键列ID=b.rkey 
    ,主键列名=(SELECT name FROM syscolumns WHERE colid=b.rkey AND id=b.rkeyid) 
    ,外键表ID=b.fkeyid 
    ,外键表名称=object_name(b.fkeyid) 
    ,外键列ID=b.fkey 
    ,外键列名=(SELECT name FROM syscolumns WHERE colid=b.fkey AND id=b.fkeyid) 
    ,级联更新=ObjectProperty(a.id,'CnstIsUpdateCascade') 
    ,级联删除=ObjectProperty(a.id,'CnstIsDeleteCascade') 
FROM sysobjects a 
    join sysforeignkeys b on a.id=b.constid 
    join sysobjects c on a.parent_obj=c.id 

删除：

    declare @sql varchar(max),
 @tab_name varchar(128),
 @fk_name varchar(128);
declare c cursor for
select OBJECT_NAME(parent_object_id), name from sys.objects where type='F'

open c
fetch next from c into @tab_name, @fk_name 
while @@FETCH_STATUS=0
begin 
 set @sql='';
 set @sql='alter table ' + @tab_name + ' drop constraint ' + @fk_name
 print @sql
 exec(@sql)
 
 fetch next from c into @tab_name, @fk_name
end
close c
deallocate c

使用方法：

打开数据库，转到要操作的那一个库，执行上面的代码即可