org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. 异常解决

在自学Mybatis的时候,创建了我的第一个Mybatis程序,可无奈一直报错,本身只是一个刚刚接触框架的小白,什么都不懂,苦苦追寻大量搜索请教了多位高人后却一直报这个错误：

org.apache.ibatis.exceptions.PersistenceException: Error querying database.Cause:com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

后来都快要放弃了,一位高人让我把Mybaitis核心配置文件中的数据库url的value只保留这一部分
然后就可以显示数据库的数据了!!!可是它还是有一个警告:

Sat Nov 30 18:30:19 CST 2019 WARN: 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 existing applications not using SSL the verifyServerCertificate property is set to ‘false’. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

于是我就把useSSL=true改成了useSSL=false,至此程序一切正常!

完整的url的value如下:
jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=utf8

至于更改的原因:
https://blog.csdn.net/u012998306/article/details/80756387