jdbc连接mysql的url怎么写

很多问题都是在发现的时候才觉得重要.

autoReconnect=true&failOverReadOnly=false

问题现象：

com.MySQL.jdbc.CommunicationsException:The last packet successfully received from the server was58129 seconds ago.Thelast packet sent successfully to the server was 58129 seconds ago, which islonger than the server configured value of ‘wait_timeout‘. You should considereither expiring and/or testing connection validity before use in yourapplication, increasing the server configured values for client timeouts, orusing the Connector/J connection property ‘autoReconnect=true‘ to avoid thisproblem.

解决办法：

对应中文环境，通常mysql连接URL可以设置为：

jdbc:mysql://localhost:3306/test?user=root&password=&useUnicode=true&characterEncoding=gbk&autoReconnect=true&failOverReadOnly=false

在使用数据库连接池的情况下，最好设置如下两个参数：

autoReconnect=true&failOverReadOnly=false

需要注意的是，在xml配置文件中，url中的&符号需要转义成&。比如在tomcat的server.xml中配置数据库连接池时，mysql jdbc url样例如下：

jdbc:mysql://localhost:3306/test?user=root&password=&useUnicode=true&characterEncoding=gbk

&autoReconnect=true&failOverReadOnly=false