org.apache.ibatis.exceptions.PersistenceException: ###Error querying database. Cause: com.mysql.jd

org.apache.ibatis.exceptions.PersistenceException:

###Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

###The error may exist in EmployeeMapper.xml

###The error may involve com.atguigu.mybatis.EmployeeMapper.selectEmp

###The error occurred while executing a query

###Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

原因：mysql的驱动包mysql-connector-java-x.x.x-bin.jar没导对，换一个版本试试