修改数据库配置信息：
<property name="url" value="jdbc:mysql://localhost:3306/mybatisdb?useSSL=false&serverTimezone=Asia/Shanghai &zeroDateTimeBehavior=CONVERT_TO_NULL &useUnicode=true&characterEncoding=UTF-8"/>
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
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