@Tencent KJAVAWEB后台编写中，web程序与MysqL数据库连接时遇到的问题
**org.apache.ibatis.exceptions.PersistenceException:
Error querying 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.
The error may exist in com/hrbeu/mapper/AccountMapper.xml
The error may involve com.hrbeu.mapper.AccountMapper.selByAccnopwd
The error occurred while executing a query
Cause: com.MysqL.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure**
经过各种排查
<property name="url" value="jdbc:MysqL://localhost:306/managesystem"/>
url中端口号写错
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