昨天有运营说添加活动不能用了,我就看了一下后台日志,发现访问数据库是报错: at java.lang.Thread.run(Thread.java:722) Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 59,085,803 milliseconds ago. The last packet
因为毕设是地下车库管理系统,所以打算学习jsp进行开发~ 今天主要是[新建网站项目+mysql链接],在此篇之前所做的工作:tomcat服务器配置,mysql数据库的安装与启用(在之后的开发中可以使用MySQL-Front图形化工具进行sql的增删改查,懒人+技术渣一枚),数据库驱动文件(mysql-connector-java)的下载. 在eclipse中新建动态网站项目,具体操作为File——>New——>Dynamic Web Project.后弹出如下框: 与Mysql链接:之后在 P
navicat for mysql 链接时报错:1251-Client does not support authentication protocol requested by serve 解决方法: mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456'; mysql> select host,user,plugin,authentication_string from mysql.use
DAOProxy的代码:下面代码中红色高亮的就是出问题的地方,DAOFactory中会构造一个PersonDAOProxy,调用listPersons或者addPerson显然会导致递归,从而导致MySQL链接数溢出!将高亮处的代码修改为:dao.listPersons().dao.addPerson(person)即可! public class PersonDAOProxy implements IPersonDAO { private DatabaseConnection conn = n
报错: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with exi
mysql 链接数满了的错误 ERROR 1040 (HY000): Too many connections 第一种处理方式: ./mysql -u root -p 登录成功后执行以下语句查询当前的最大连接数: select VARIABLE_VALUE from information_schema.GLOBAL_VARIABLES where VARIABLE_NAME='MAX_CONNECTIONS'; 执行以下语句修改最大连接数: set global max_connections