首页 > 代码库 > SQLServer禁用、启用外键约束

SQLServer禁用、启用外键约束

2024-07-30 07:11:40   222人阅读

---启用or禁用指定表所有外键约束  alter table PUB_STRU  NOCHECK constraint all;  alter table PUB_STRU  CHECK constraint all;    ---生成启用or禁用指定表外键约束的sql  select ‘ALTER TABLE ‘ + b.name + ‘ NOCHECK CONSTRAINT ‘ + a.name +‘;‘  from sysobjects a ,sysobjects b where a.xtype =‘f‘ and a.parent_obj = b.id and b.name=‘表名‘;  select ‘ALTER TABLE ‘ + b.name + ‘ CHECK CONSTRAINT ‘ + a.name +‘;‘  from sysobjects a ,sysobjects b where a.xtype =‘f‘ and a.parent_obj = b.id and b.name=‘表名‘;  --生成的sql如下ALTER TABLE PUB_STRU NOCHECK CONSTRAINT PUBSTRU_FK1; ALTER TABLE PUB_STRU NOCHECK CONSTRAINT PUBSTRU_FK2; ALTER TABLE PUB_STRU CHECK CONSTRAINT PUBSTRU_FK1; ALTER TABLE PUB_STRU CHECK CONSTRAINT PUBSTRU_FK2;    --查看约束状态（查询字典表 sys.foreign_keys，该字典表开始出现于sqlserver2005及以上版本）：select name , is_disabled from sys.foreign_keys order by name;   --其中：name  ： 外键约束名称   is_disabled : 是否已禁用

　　

例子：

 --删除外键alter table AdItem drop constraint AdOrder_AdItem_FK1--增加外键alter table AdItem add constraint AdOrder_AdItem_FK1 foreign key (AI_nOrderNo) references AdOrder(AO_nOrderNo)--单个表的一个外键alter table Student nocheck constraint FK__Student__SchoolN__4222D4EF  alter table Student check constraint FK__Student__SchoolN__4222D4EF  --单个表的所有外键alter table Student nocheck constraint all  alter table Student check constraint all  --某个数据库的所有表EXEC sp_MSforeachtable @command1=‘alter table ?  NOCHECK constraint all;EXEC sp_MSforeachtable @command1=‘alter table ?  CHECK constraint all;

 

参考：
 Enable/Disable Constraint in SQLServer 
 sp_MSforeachtable使用方法

SQLServer禁用、启用外键约束


联系
我们