1.引入依賴

<!-- https://mvnrepository.com/artifact/tk.mybatis/mapper -->
       <dependency>
           <groupId>tk.mybatis</groupId>
           <artifactId>mapper</artifactId>
           <version>4.1.5</version>
       </dependency>

2.編寫表對(duì)應(yīng)的實(shí)體類

@Table(name = "users")
public class User implements Serializable {
    @Id
    private int id;
    private String username;
    private String password;
    private String email;

3.寫mapper

/**
 * @author ：gzy
 * @date ：Created in 2019/10/22
 * @description ：
 * @version: 1.0
 */
@Service
public interface RoleMapper extends Mapper<User> {

}

4.啟動(dòng)開啟掃描通用mappper位置

注意@MapperScan注解引入的包名

package com.guo.lianxi1020;

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

@SpringBootApplication
@MapperScan(basePackages = "com.guo.lianxi1020.dao")
public class Lianxi1020Application {

    public static void main(String[] args) {
        SpringApplication.run(Lianxi1020Application.class, args);
    }

}