1、添加依赖：

  1. <!-- mysql 依赖jar，只添加mysql依赖可以不配置数据源 -->
  2. <dependency>
  3.     <groupId>mysql</groupId>
  4.     <artifactId>mysql-connector-java</artifactId>
  5.     <version>8.0.26</version>
  6. </dependency>
  8. <!-- mybatis 依赖jar，添加mybatis起步依赖，必须配置数据源 -->
  9. <dependency>
  10.     <groupId>org.mybatis.spring.boot</groupId>
  11.     <artifactId>mybatis-spring-boot-starter</artifactId>
  12.     <version>2.2.0</version>
  13. </dependency>

2、修改配置文件application.yml

添加数据源配置和MyBatis配置

  1. spring:
  2.   datasource:
  3.     driver-class-name: com.mysql.cj.jdbc.Driver
  4.     url: jdbc:mysql://localhost:3306/student?useSSL=false&useUnicode=true&characterEncoding=UTF-8
  5. # 使用mysql8的驱动 要加上&serverTimezone=Asia/Shanghai
  6.     username: root
  7.     password: root
  9. #mybatis配置
  10. mybatis:
  11.   mapper-locations: classpath:mapper/*.xml
  12.  # config-location: classpath:mybatis-config.xml
  13.   type-aliases-package: edu.xja.entity
  14. configuration:
  15.      log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  16.      #下划线转驼峰
  17.      map-underscore-to-camel-case: true   
  19. #mybatis配置
  20. #mybatis:
  21.   #typeAliasesPackage: edu.xja.domain
  22.   #mapperLocations: classpath:mapping/*.xml
  23.   #configLocation: classpath:/mybatis-config.xml

代码解释：
Yml配置文件也支持驼峰模式，看上面的注释，理解一下
Mysql8 url 配置加上时区：serverTimezone=Asia/Shanghai

3、创建启动类进行测试

  1. @SpringBootApplication
  2.     public class Application {
  3.         public static void main(String[] args) {
  4.             SpringApplication.run(Application.class,args);
  5.         }
  6.     }

创建Dao层，Service层进行测试，暂不赘述。