摘要：MySQL 时间函数 https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html mysql 日期数据类型 http://www.runoob.com/mysql/mysql-data-types.html 阅读全文

摘要：you can not do "import x as y;" in Java. What you CAN do is to extend the class, or write a wrapper class for it, and import that one instead. 阅读全文