pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.lnfvc</groupId>
    <artifactId>mabatis-demo02</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <artifactId>spring-boot-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.2.9.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>


</project>

application.yml

server:
  port: 4000
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3308/test
    username: root
    password: 123

mybatis:
  config-location: classpath:mybatis-config.xml

mybatis-config.xml

<?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">
<configuration>
<mappers>
        <mapper resource="mapper/BookMapper.xml"/>
    </mappers>
</configuration>

BookMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="mybatis.demo.BookMapper">
    <select id="selectBook" resultType="mybatis.demo.Book">
        select * from books where id = #{id}
    </select>
</mapper>

App

package mybatis.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class);
    }
}

BookMapper

package mybatis.demo;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface BookMapper {
    Book selectBook(int id);
}

BookController

package mybatis.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class BookController {
    @Autowired
    private BookMapper bookMapper;
    @GetMapping("/books/{id}")
    public Book selectBook(@PathVariable("id") int id){
        return bookMapper.selectBook(id);
    }
}

Book

package mybatis.demo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Book {
    private  Integer id;
    private  String name;
}

Mybatis网站

https://mybatis.org/mybatis-3/zh/index.html

spring-boot-starter-mybatis网站

https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter

Windows PowerShell（管理员）

use test;
show tables;
create table books(id int auto_increment primary key,name varchar(20));
insert into books(name) values("abc");
desc books;

项目路径图

c0b3cecc90086619fc8216c5569888c.jpg