2.18 基于通用 Mapper 基于 Rest 编写 api 接口-2

在 idea 中，mapper 类在引用的时候会提示红色波浪线，这不是错误

引用 mapper 类会提示红色波浪线
打开设置——编辑器——检查——自动装配 Bean 类，去掉这里的勾即可取消 idea 的错误提示

完善 StuServiceImpl 类

package com.imooc.service.impl;
import com.imooc.mapper.StuMapper;
import com.imooc.pojo.Stu;
import com.imooc.service.StuService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
/**
 * @author 92578
 * @since 1.0
 */
@Service
public class StuServiceImpl implements StuService {
    @Autowired
    private StuMapper stuMapper;
    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public Stu getStuInfo(int id) {
        return stuMapper.selectByPrimaryKey(id);
    }
    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void soveStu() {
        Stu stu = new Stu();
        stu.setName("jack");
        stu.setAge(19);
        stuMapper.insert(stu);
    }
    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void updateStu(int id) {
        Stu stu = new Stu();
        stu.setId(id);
        stu.setName("lucy");
        stu.setAge(20);
        stuMapper.updateByPrimaryKey(stu);
    }
    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void deleteStu(int id) {
        stuMapper.deleteByPrimaryKey(id);
    }
}

完善 StuFooController 类

package com.imooc.controller;
import com.imooc.service.StuService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * @author 92578
 * @since 1.0
 */
@RestController
public class StuFooController {
    @Autowired
    private StuService stuService;
    @GetMapping("/getStu")
    public Object getStu(int id) {
        return stuService.getStuInfo(id);
    }
    @PostMapping("/saveStu")
    public Object saveStu() {
        stuService.saveStu();
        return "OK";
    }
    @PostMapping("/updateStu")
    public Object updateStu(int id) {
        stuService.updateStu(id);
        return "OK";
    }
    @PostMapping("/deleteStu")
    public Object deleteStu(int id) {
        stuService.deleteStu(id);
        return "OK";
    }
}

【注意】
编写接口要注意接口的幂等性，简单来说就是多次调用相同接口都是对同一条记录操作。