spring boot集成mybatis-plus——根据id查询用户信息

迷南。 2023-09-29 18:48 21阅读 0赞

为了便捷的操作。不按照前面几篇的方式。直接在controller中进行mapper注入和操作。

package org.example.controller;
    
    import org.example.Entity.MyUser;
    import org.example.mapper.UserMapper;
    import org.example.service.MyUserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.*;
    import java.util.List;
    
    @RestController
    public class MyUserController
    {
    
        @Autowired
        private MyUserService myUserService;
    
        @Autowired
        private UserMapper userMapper;
    
    
        @GetMapping(value = "/findAll")
        public List<MyUser> findAll()
        {
            // 查询所有用户信息
            List<MyUser> users = myUserService.findAll();
    
            for (MyUser user : users)
            {
                System.out.println(user.getId()+"  "+user.getName()+"  "+user.getAge());
            }
    
            return users;
        }
    
    
        @GetMapping(value = "/save")
        public int save()
        {
            MyUser user = new MyUser();
            user.setName("小文");
            user.setAge(21);
    
            int insert = myUserService.save(user);//如果没有设置id，那么会自动生成id
    
            System.out.println(insert);//受影响行数
    
            System.out.println(user);//id会自动回填
    
            return insert;
        }
    
        @GetMapping(value = "/updateById")
        public int updateById()
        {
            MyUser user = new MyUser();
            user.setId(1014);
            user.setName("小文改");
            user.setAge(222);
    
            int insert = myUserService.update(user);
    
            System.out.println(insert);//受影响行数
    
    
            return insert;
        }
    
    
        @GetMapping(value = "/updateByName")
        public int updateByIdName()
        {
    
            int insert = myUserService.updateByName();
    
            System.out.println(insert);//受影响行数
    
            return insert;
        }
    
    
        @GetMapping(value = "/findById")
        public MyUser findById()
        {
    
            MyUser user = userMapper.selectById("1015");
    
    
            System.out.println(user);
    
            return user;
        }
    
    }

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[c97c83b642a6d8b92877b49c3280350f.png]: https://img-blog.csdnimg.cn/img_convert/c97c83b642a6d8b92877b49c3280350f.png
[ab051c32e4bffc5dbb7a540a3b38ea13.png]: https://img-blog.csdnimg.cn/img_convert/ab051c32e4bffc5dbb7a540a3b38ea13.png