Webb11 apr. 2024 · 本篇介绍MySQL在可重复度RR隔离级别下,引入的一种锁机制:间隙锁 (Gap Lock);间隙锁与事务相关的表锁、行锁不同,它锁的是“往这个间隙中插入一个记录”这 … Webb27 maj 2024 · ON DUPLICATE KEY UPDATE 是 MySQL 特有的语义,支持根据唯一约束,对记录进行插入或更新操作;已存在则更新,不存在则插入; 本地环境 MySQL + Mybatis …
[GitHub] [shardingsphere] cheese8 commented on a change in pull …
Webb31 okt. 2024 · Key-Based: One of the columns, called shard key, is put through a hash function. The result determines the shard for that row. Also called hash-based sharding … WebbON DUPLICATE KEY UPDATE 是 MySQL 特有的语义,支持根据唯一约束,对记录进行插入或更新操作;已存在则更新,不存在则插入; 本地环境 MySQL + Mybatis + … highest marks obtained in jee advanced
MySQL 分布式数据库实现:无需修改代码,轻松实现分布式能力
Webb[GitHub] [incubator-shardingsphere] hollydragon removed a comment on issue #5210: ON DUPLICATE KEY UPDATE Sub-Clause paramter dropped. GitBox Thu, 16 Apr 2024 02:08:03 -0700. hollydragon removed a comment on issue #5210: ON DUPLICATE KEY UPDATE Sub-Clause paramter dropped URL: ... Webb17 feb. 2024 · Support update sharding key when the sharding routing result keep the same Optimize rewrite engine performance Support select union/union all … statements … Webb30 juli 2024 · 1、insert into table (name, version) values (?, ?) on duplicate key update version = version + 1 2、insert into table (name) values (?), (?) on duplicate key update … highest marks in neet