1. Look the original code, found things do not understand, we must first think it is right, then in accordance with the request, database, etc. carding understand, also found contradictory, I think it is wrong.
See Table 2. The usefulness field, the field can see whether the attributes of the table.
3. not know to ask, who says the code, casual can help you understand.
Write code on demand
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Origin www.cnblogs.com/zd540/p/11490977.html
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