摘要：
在项目中用到了timestamp这个类型，该字段本意是用于存储改行记录的创建时间的，实际上这是一个很危险的设置；mysql官方文档上有这么一段话：TheTIMESTAMPdata type provides a type that you can use to automatically markINSERTorUPDATEoperations with the current date and time. If you have multipleTIMESTAMPcolumns in a table, only the first one is updated automatically. 阅读全文
