druid连接池连不上mysql_mysql-使用druid连接池连接数据库，出现了以下问题，忘各位大神解答...
com.mysql.jdbc.exceptions.jorg.apache.ibatis.exceptions.PersistenceException:Error updating database.Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe la..
com.mysql.jdbc.exceptions.jorg.apache.ibatis.exceptions.PersistenceException:
Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
请各位大神帮帮小弟我，这是出现什么问题
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