SQLServer禁用、启用外键约束
---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
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