一、创建项目

添加application.yml配置文件 添加启动类 在resources中添加mappers文件夹 在java中添加entity、dao、service、controller包

二、在pom.xml中添加依赖

<!-- MyBatisPlus依赖-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.1</version>
</dependency>
<!--LomBok依赖-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId> <optional>true</optional>
</dependency>
<!--mysql依赖-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

三、在application.yml中配置数据源

spring:
  # 配置数据源信息
  datasource:
    # 配置数据源类型
    type: com.zaxxer.hikari.HikariDataSource
    # 配置连接数据库信息
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/practice?characterEncoding=utf-8&useSSL=false
    username: root
    password: Aa123123.
mybatis-plus:
  type-aliases-package: demo.entity
  mapper-locations: classpath:mappers/*.xml

四、在启动类Demo.java中扫描dao

package demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("demo.dao")
public class Demo {

    public static void main(String[] args) {
        SpringApplication.run(Demo.class, args);
    }
}