MySQL连接中出现的问题

异常：

Establishing SSL connection without server's identityverification 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 optionisn't set. For compliance with existing applications not using SSL theverifyServerCertificate property is set to 'false'. You need either toexplicitly disable SSL by setting useSSL=false, or set useSSL=true and providetruststore for server certificate verification.

原因是MySQL在高版本需要指明是否进行SSL连接。解决方案如下：

在mysql连接字符串url中加入ssl=true或者false即可，如下所示。

url: jdbc:mysql://localhost:3306/blog?useUnicode=true&characterEncoding=utf-8&useSSL=true

异常：

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'.

整合spring boot项目过程中出现的，用了最新的mysql 连接驱动

application.yml

spring:
  application:
    name: test
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: root

需要将 com.mysql.jdbc.Driver  改为  com.mysql.cj.jdbc.Driver

spring:
  application:
    name: test
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1.61:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: root

异常：

**　java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.**

解决办法：
修改数据库时区：

在数据库连接url的最末端加上：&serverTimezone=UTC，各个属性用&分割

url: jdbc:mysql://localhost:3306/blog?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC

异常：

ERROR 9936 --- [  restartedMain] o.a.tomcat.jdbc.pool.ConnectionPool : Unable to create initial connections of pool.

问题：服务器未打开SSL功能

解决方法：

将useSSL=true改为useSSL=false