Mabtis 之 Mybatis-config.xml因为mys

出现这个前提是高版本mysql驱动,mysql-connector-java版本高和版本低的配置不同!不同!不同!

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
      PUBLIC"-//mybatis.org//DTD Config 3.0//EN" 
      "http://mybatis.org/dtd/mybatis-3-config.dtd">
<!--通过这个配置文件，完成mybatis与数据库的连接  -->
<configuration>   
      <environments default="">      
      <environment id="">          
      <transactionManager type="JDBC"/>           
        <dataSource type="POOLED">              
               <property name="driver"value="com.mysql.cj.jdbc.Driver"/>             
               <property name="url" value="jdbc:mysql://localhost:3306/tdoke-iot?characterEncoding=utf-8&amp;serverTimezone=UTC&amp;useSSL=false" />              
               <property name="username" value="root" />            
               <property name="password" value="root" />          
         </dataSource>      
         </environment> 
       </environments>      
  <mappers>         
     <mapper class="com.tdoke.mapper.DeviceMapper"/>          
    <mapper resource="mapper/DeviceMapper.xml"/>      
    </mappers> 
 </configuration>

上面 jdbc:mysql://localhost:3306/tdoke-iot?characterEncoding=utf-8&serverTimezone=UTC&useSSL=false 是解决的结果,贴上可以解决你的问题,下面讲问题在哪

1. 如果jdbc:mysql://localhost:3306/tdoke-iot?characterEncoding=utf-8只写到这里,报下面的错:

Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException:
 The server time zone value 'Öйú±ê׼ʱ¼ä' 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

2.加上&serverTimezone=UTC&useSSL=false;可以保证你xml里面配置不报错,然后关键的是这句serverTimezone=UTC

这是因为为了使MySQL JDBC驱动程序与UTC时区配合使用，必须在连接字符串中明确指定serverTimezone

就是这句话
你加上就好了
?characterEncoding=utf-8&serverTimezone=UTC&useSSL=false