spring boot集成mybatis-plus——通过id修改用户信息

雨点打透心脏的1/2处 2023-09-29 18:49 12阅读 0赞

实体类不变：

package org.example.Entity;
    
    import com.baomidou.mybatisplus.annotation.IdType;
    import com.baomidou.mybatisplus.annotation.TableId;
    import com.baomidou.mybatisplus.annotation.TableName;
    
    @TableName("users")        //不一致时，需要映射
    public class MyUser
    {
        @TableId(type = IdType.AUTO)
        private int id;
    
        private String name;
    
        private int age;
    
        public int getId()
        {
    
            return id;
        }
    
        public void setId(int id)
        {
    
            this.id = id;
        }
    
        public String getName()
        {
    
            return name;
        }
    
        public void setName(String name)
        {
    
            this.name = name;
        }
    
        public int getAge()
        {
    
            return age;
        }
    
        public void setAge(int age)
        {
    
            this.age = age;
        }
    
        @Override
        public String toString()
        {
    
            return "MyUser{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }

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服务类：

package org.example.service;
    
    import org.example.Entity.MyUser;
    
    import java.util.List;
    
    public interface MyUserService
    {
    
        // 查询所有用户
        List<MyUser> findAll();
    
        int save(MyUser myUser);
    
    
        int update(MyUser myUser);
    
    }

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package org.example.service.Impl;
    
    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.stereotype.Service;
    import java.util.List;
    
    @Service
    public class MyUserServiceImpl implements MyUserService
    {
    
        //继承了BaseMapper所有的方法，可以编写自己的扩展方法
        @Autowired
        private UserMapper userMapper;
    
    
        /**
         * 查询所有用户信息
         * @return
         */
        @Override
        public List<MyUser> findAll()
        {
    
            return userMapper.selectList(null);
    
    
        }
    
        /**
         * 增加一个用户信息
         * @param myUser
         * @return
         */
        @Override
        public int save(MyUser myUser) {
            return userMapper.insert(myUser);
        }
    
        /**
         * 通过id修改用户信息
         * @param myUser
         * @return
         */
        @Override
        public int update(MyUser myUser) {
            return userMapper.updateById(myUser);
        }
    
    
    }

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控制器类：

package org.example.controller;
    
    import org.example.Entity.MyUser;
    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;
    
    
        @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;
        }
    
    
    }

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[5e8ea5a53b7e7d181006b7aaf8af4ffc.png]: https://img-blog.csdnimg.cn/img_convert/5e8ea5a53b7e7d181006b7aaf8af4ffc.png
[3262ce0b6010f436c30650af7dcd37f5.png]: https://img-blog.csdnimg.cn/img_convert/3262ce0b6010f436c30650af7dcd37f5.png
[e099ee898728b5646697b2f34b0acf59.png]: https://img-blog.csdnimg.cn/img_convert/e099ee898728b5646697b2f34b0acf59.png
[5055dd3d85cd927e00f35f4c848c4cde.png]: https://img-blog.csdnimg.cn/img_convert/5055dd3d85cd927e00f35f4c848c4cde.png
[1165d0f33da7b27290e952a940e2ca6c.png]: https://img-blog.csdnimg.cn/img_convert/1165d0f33da7b27290e952a940e2ca6c.png
[22b5fd9bc1917288135cc8d053d91c73.png]: https://img-blog.csdnimg.cn/img_convert/22b5fd9bc1917288135cc8d053d91c73.png