mysql Innodb 事务使用

https://dev.mysql.com/doc/refman/5.5/en/innodb-locking-reads.html

If you query data and then insert or update related data within the same transaction, the regular

SELECT

statement
does not give enough protection. Other transactions can update or delete the same rows you just queried.

InnoDB

supports
two types of locking
reads that offer extra safety:

1）

SELECT
... LOCK IN SHARE MODE

2）SELECT
... FOR UPDATE

ok Innodb transaction select lock Read 解决~~。