syk1996的博客

使用Hibernate + MySQL数据库开发，链接超时问题：com.mysql.jdbc.CommunicationsException: The last packet successfully received from the server was58129 seconds ago.The last packet sent successfully to the server was 58

在群中偷学的时候发现一个问题，如果MySql表中有重复的字段，要删除这些重复字段改怎么做MySql部分:SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for user-- ----------------------------DROP TABLE IF EXISTS `user`;CR