springboot整合mybatis(2)

1.因为已经生成了dao层的配置文件和接口 只需要写service层和controller层即可

2.controller层

package com.mc_74120.springbootmybatis.controller;

import com.mc_74120.springbootmybatis.pojo.User;
import com.mc_74120.springbootmybatis.service.UserServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserServiceImpl userService;
    @PostMapping("/addUser")
    public String addUser(User user){
        try {
userService.addUser(user);
        }
        catch (Exception e){
            e.printStackTrace();
            return  "error";
        }
        return  "redirect:/ok";
    }
    @GetMapping("findAllUser")
    public String findAllUser(Model model){
        try {
       List<User> users= userService.findAllUser();
       model.addAttribute("userList",users);
        }
        catch (Exception e){
            e.printStackTrace();
            return  "error";
        }
        return  "selectUser";
    }
    @GetMapping("/preUpdate")
    public String preUpdate(@RequestParam Integer id,Model model){
        try {
          User user= userService.preUpdate(id);
            model.addAttribute("user",user);
        }
        catch (Exception e){
            e.printStackTrace();
            return  "error";
        }
        return  "updateUser";
    }
    @PostMapping("/updateUser")
    public String updateUser(User user){
        try {
            userService.updateUser(user);
        }
        catch (Exception e){
            e.printStackTrace();
            return  "error";
        }
        return  "redirect:/ok";
    }
    @GetMapping("/deleteUser")
    public String deleteUser(Integer id){
        try {
            userService.deleteUser(id);
        }
        catch (Exception e){
            e.printStackTrace();
            return  "error";
        }
        return  "ok";
    }
    @ExceptionHandler(value = {java.lang.NullPointerException.class})
    public ModelAndView nullPointExceptionHandler(Exception e,ModelAndView ModelAndView){
            ModelAndView.addObject("err",e.toString());
            ModelAndView.setViewName("");
            return ModelAndView;
    }
}
3.service层

package com.mc_74120.springbootmybatis.service;

import com.mc_74120.springbootmybatis.mapper.UserMapper;
import com.mc_74120.springbootmybatis.pojo.User;
import com.mc_74120.springbootmybatis.pojo.UserExample;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class UserServiceImpl implements  UserService {
    @Autowired
    private UserMapper userMapper;
    @Override
    @Transactional
        public void addUser(User user) {
            userMapper.insert(user);

    }

    @Override
    @Transactional
    public List<User> findAllUser() {
        UserExample userExample=new UserExample();
        return userMapper.selectByExample(userExample);
    }

    @Override
    public User preUpdate(Integer id) {
        return userMapper.selectByPrimaryKey(id);
    }

    @Override
    @Transactional
    public void updateUser(User user) {
        userMapper.updateByPrimaryKeySelective(user);
    }

    @Override
    @Transactional
    public void deleteUser(Integer id) {
        userMapper.deleteByPrimaryKey(id);
    }
}

package com.mc_74120.springbootmybatis.service;

import com.mc_74120.springbootmybatis.pojo.User;

import java.util.List;

public interface UserService {
    void  addUser(User user);
    List<User> findAllUser();
    User preUpdate(Integer id);
    void updateUser(User user);
    void deleteUser(Integer id);
}