INSERT操作在插入或更新记录时,检查到 duplicate key或者有一个被标记删除的duplicate key(本文的案例),对于普通的INSERT/UPDATE,会加LOCK_S属性锁next-key lock。而对于类似REPLACE INTO或者INSERT … ON DUPLICATE这样的SQL加的是X锁。而针对不同的索引类型也有所不同: 代码位置 row0ins.cc:2013 if (flags & ...
basically I want to remove the xxxx@nowhere.com row where the cust_type is equal to 1...but only when there's a duplicate entry. Can anyone explain the syntax that I would have to use? I've tried looking into COUNT() and stuff like that but the combined syntax of COUNT() and DE...
则返回null +---+ 1 row in set (0.00 sec) mysql> select null not in ('a', 'b', null); +---+ | null not in ('a', 'b', null) | +---+ | NULL | -- null不在('a', 'b', null)中,返回的还是null,因为有null和null的比较 +---+ 1 row in set (0.00 sec) mysql> ...
ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY' mysql> 复制代码 虽然提示更新失败,但实际上是更新成功的。设置允许任意主机连接。 若是进入mysql报这个错:Access denied for user (using password: YES) 则如下解决: 1)、关闭mysql service mysqld stop 2)、屏蔽权限 mysqld_safe --skip...
所以,在两个Tomcat 中用select max同时取主键,就相当于在没有synchronized的保护下,并发时就会取出相同的值,再insert就会发生dumplicate entry的错误。 后来查看Hibernate的Reference中也提到,increment不要再集群下使用。 问题找到了,解决的办法也很简单,就是使用MySQL自己的auto_increment功能来产生主键。只需将所有...
ERROR 1062 (23000): Duplicate entry '1' for key 'PRIMARY' mysql> insert into t_user values (3,'maiqi',3); //参照完整性测试,不能插入在主表中不存在的外键值 ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`test`.`t_user`, CONSTRAINT `t_user...
如何使用网络接口获取数据库MySQL中的数据 Socket连接报错,错误码88 Stage模型如何配置支持http明文传输 Image组件加载网络图片,PixelMap与直接访问url有什么区别 http请求中能否不设置Content-Type参数 http请求报错2300006如何解决 http请求响应为空,报错:“The request has been canceled or the number of reque...
问题和分析 mysql从库延迟太大, SQL线程和IO线程都是Running的, 但延迟有5天左右. SQL线程状态为:applying batch of row changes (delete) 解析相关relay log得到正在执行的事务信息 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysqlbinlog-vvv--base64-output=decode-row relay.xxxxx--start-position|...
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