MySQL 更新并返回计数_MySQL
- WBOYOriginal
- 2016-06-01 13:06:36951browse
对于想使用 MySQL 实现简单 ID 分配器, 一般就是设置一个整数字段, 然后想分配的时候加 1 并返回. 新手往往犯错误, 先执行一条 update 语句, 然后再 select 那个字段. 但这是错误的!
正确的方式应该是使用 last_insert_id() 函数:
update mytable set count=last_insert_id(counter+1);select last_insert_id();
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