mysql并发控制加锁
各位大神，mysql在处理并发控制时，怎么给共享变量加锁，达到无论几个人同时访问，只有一个人对数据有控制权，能够避免读脏数据，丢失修改，达到二级锁的效果呢，找了好长时间的资料了，都没弄明白，望大神解救啊.
比如。create talbe test_table (test int ); 怎么实现test字段的控制
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