JavaEE Spring MyBatis如何一步一步实现数据库查询功能

package listen.controller;

import listen.mapper.TestMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created with IntelliJ IDEA.
 * Description: If you don't work hard, you will a loser.
 * User: Listen-Y.
 * Date: 2020-08-21
 * Time: 23:14
 */
@RestController
@RequestMapping(value = "user")
public class MyselfTest {

 @Autowired
 private TestMapper testMapper;

 @RequestMapping(value = "test")
 public Object test() {
 return testMapper.query(1);
 }

}