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mysql事务特性实现并发安全的自增ID示例

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Release: 2016-06-07 16:18:13
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重点是这句,select id into oldid from maibo_auto_id where idname=idname_in for update,会给相关数据加一个独占锁定,这时候别的进程如果来读取该条记录,就会进入等待,等待这个进程commit之后,再继续,这样就保证了在并发的情况下,不同的进程不会取

重点是这句,select id into oldid from maibo_auto_id where idname=idname_in for update,会给相关数据加一个独占锁定,这时候别的进程如果来读取该条记录,就会进入等待,等待这个进程commit之后,再继续,这样就保证了在并发的情况下,不同的进程不会取到相同的值。 

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