application.properties配置数据库的连接

spring.datasource.type= org.apache.tomcat.jdbc.pool.DataSource
spring.datasource.url=jdbc:mysql:///vueblog2?useUnicode=true&characterEncoding=UTF-8&useSSL=true&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=3212626
mybatis.config-location=classpath:/mybatis-config.xml
server.port=8082
logging.level.org.springframework.security=info

每一行是什么意思搞不懂