1、导入mybatis的起步依赖mybatis-spring-boot-starter

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>3.0.3</version>
</dependency>

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
</dependency>

2、在yml里编写数据库驱动
我的mysql5

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/表名?useSSL=false
    username: root
    password: ele994
    driver-class-name: com.mysql.jdbc.Drive
    # driver-class-name: com.mysql.cj.jdbc.Driver

我的mysql8

spring:
  datasource:
    url: jdbc:mysql://localhost:3307/表名?useSSL=false
    username: root
    password: ele994111
    driver-class-name: com.mysql.jdbc.Driver
     # driver-class-name: com.mysql.cj.jdbc.Driver