mysql安装
https://blog.csdn.net/weixx3/article/details/80782479
unsigned字段
https://www.cnblogs.com/blankqdb/archive/2012/11/03/blank_qdb.html
auto_increment
https://www.cnblogs.com/isme-zjh/p/11542834.html
触发器
https://www.cnblogs.com/zh-1721342390/p/9602941.html
int转字符串
https://www.cnblogs.com/xing-nb/p/12218946.html
防止sql注入
https://www.cnblogs.com/pressur/p/11226392.html
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