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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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Related labels：
mysql affairs Safety accomplish concurrent characteristic Example self-increasing
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