mysql8.0配置：
spring:
datasource:
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8&useSSL=false
driver-class-name: com.mysql.cj.jdbc.Driver
username: root
password: 123456
mysql5.7配置：
spring:
datasource:
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
driver-class-name: com.mysql.jdbc.Driver
username: root
password: 123456
