MySQL在删除一张表时出现 ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails 原因 可能是在Mysql中,删除的表和另一张表设置了foreign key的关联,造成无法更新或删除数据; 解决方案 可以通过设置FOREIGN_KEY_CHECKS变量来避免这种情况。 禁用外键约束 代码语言:javascript ...
mysql 删除数据表报错 表删除时 Cannot delete or update a parent row: a foreign key constraint fails 异常处理 MySQL报错 "Cannot delete or update a parent row: a foreign key constraint fails" 通常表示在尝试删除数据表时,存在外键约束,而删除操作可能会破坏这些约束。这是MySQL的一种保护机制,以确保数据...
Cannot delete or update a parent row: a foreign key constraint fails 2 解决方法 SETforeign_key_checks=0;//先设置外键约束检查关闭droptablemytable;//删除数据,表或者视图SETforeign_key_checks=1;//开启外键约束检查,以保持表结构完整性 先关闭外键约束,执行删除操作,然后再开启外键约束...
drop index 索引名 on 表名;或者 alter [ignore] table 表名 | drop primary key | drop index 索引名 | drop foreign key 外键名 视图 创建视图 create [or replace][algorithm ={ undefined|merge|temptable }] view view_name [(column_list)] as select_statement [with[ cascaded|local] check option...
ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails 原因 可能是在Mysql中,删除的表和另一张表设置了foreign key的关联,造成无法更新或删除数据; 解决方案 可以通过设置FOREIGN_KEY_CHECKS变量来避免这种情况。
users WHERE userTypeId = OLD.userTypeId) IS NOT NULL AND (NEW.userTypeId <> OLD.userTypeId) THEN CALL delete_ON_TABLE_users_VIOLATES_FOREIGN_KEY_CONSTRAINT(); END IF; SET FOREIGN_KEY_CHECKS = 1; END;] [Native code: 1363] [Native message: There is no NEW row in on DELETE trigger]...
DELETE FROM copy_emp; 删除中的数据完整性错误 DELETE FROM departments WHERE department_id = 60; 说明:You cannot delete a row that contains a primary key that is used as a foreign key in another table. 4. MySQL 8 新特性:计算列 什么叫计算列呢?简单来说就是某一列的值是通过别的列计算得来...
(id int primary key auto_increment,content longtext not null,userid int); --2.2 给articles表设置外键 alter table articles add constraint foreign key (userid) references users(id) on delete set null; --- --3. 向users表中插入数据,同时插入多条 insert into users (id,nikename,password,addres...
drop > truncate >delete 方式1：如果要删除的数据库存在，则删除成功。如果不存在，则报错 DROPDATA...
If there is a non-delete marked record, then it is enough to lock its existence with LOCK_REC_NOT_GAP. */ /* If innodb_locks_unsafe_for_binlog option is used or this session is using a READ COMMITED isolation level we lock only the record, i.e., next-key locking is not used....