Java编程笔记 Mysql 一篇文章看懂mysql中varchar能存多少汉字、数字,以及varchar(100)和varchar(10)的区别 看完这篇文章,你能搞清楚以下问题: 1、varchar(100)和varchar(1...
Mysql No operations allowed after connection closed错误原因及解决 No operations allowed after connection clo...