Mysql高低版本切换需要修改的配置5-8（此处以aicode为例）

初次启动数据库版本高低冲突导致的报错：

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.

我本地环境是8.0的MYsql 数据库故配置修改为 8.0

   <mysql-connector-java.version>8.0.21</mysql-connector-java.version>
   <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql-connector-java.version}</version>
            </dependency>

或者

 <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.21</version>
            </dependency>

修改完之后
再次启动报错：

Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver’. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

把com.mysql.jdbc.Driver修改com.mysql.cj.jdbc.Driver

我们做如下修改
加入这个

driver-class-name: com.mysql.cj.jdbc.Driver

Could not create connection to database server. Attempted reconnect 3 times. Giving up.

1、将所有的driver-class-name值都从com.mysql.jdbc.Driver修改为com.mysql.cj.jdbc.Driver（上面说过了）

2、在url的参数后面新增时区参数：&serverTimezone=UTC

3、修改url连接参数中的值更新为：zeroDateTimeBehavior=CONVERT_TO_NULL

spring:
  profiles: dev
  datasource:
      #url: jdbc:mysql://localhost:3306/easycode?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull
      url: jdbc:mysql://localhost:3306/easycode?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&serverTimezone=UTC
      username: root
      password: root
      filters: log4j,wall,mergeStat
      driver-class-name: com.mysql.cj.jdbc.Driver

注释了的是以前的；新的是修改后的；

希望可以帮助到大家；