springboot articles] seven. crud springboot in

Based on [springboot articles] VI. The transaction control springboot

springboot of crud

Project Preparation

1. Create a project day64-springboot-05-crud
2. Project Configuration Reference the last chapter
3. New Database day64-springboot-crud

   DROP TABLE IF EXISTS `user`;
   CREATE TABLE `user` (
     `id` int(8) NOT NULL AUTO_INCREMENT,
     `name` varchar(20) DEFAULT NULL,
     `pwd` varchar(20) DEFAULT NULL,
     `age` int(3) DEFAULT NULL,
     `money` double(8,2) DEFAULT NULL,
     PRIMARY KEY (`id`)
   ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
   
   INSERT INTO `user` VALUES ('1', 'wpj', '123456', '23', '10000.00');
   INSERT INTO `user` VALUES ('2', 'czh', '123456', '22', '10000.00');
   

4. Create a User entity class

   package com.wpj.bean;
   
   import com.baomidou.mybatisplus.annotations.TableId;
   import com.baomidou.mybatisplus.annotations.TableName;
   import com.baomidou.mybatisplus.enums.IdType;
   import lombok.Data;
   
   @Data
   @TableName("user")
   public class User {
   
       @TableId(type = IdType.AUTO)
       private Integer id;
   
       private String name;
   
       private String pwd;
   
       private Integer age;
       
       private Double money;
   
   }
   

5. Create a mapper interface and the service and its impl

   package com.wpj.mapper;
   
   import com.baomidou.mybatisplus.mapper.BaseMapper;
   import com.wpj.bean.User;
   
   public interface IUserMapper extends BaseMapper<User> {
   
   }
   

   package com.wpj.service;
   
   import com.wpj.baseservice.IBaseService;
   import com.wpj.bean.User;
   
   public interface IUserService extends IBaseService<User> {
   
   }
   

   package com.wpj.service.impl;
   
   import com.baomidou.mybatisplus.mapper.BaseMapper;
   import com.baomidou.mybatisplus.plugins.Page;
   import com.wpj.baseservice.impl.BaseServiceImpl;
   import com.wpj.bean.User;
   import com.wpj.mapper.IUserMapper;
   import com.wpj.service.IUserService;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Service;
   
   @Service
   public class UserServiceImpl extends BaseServiceImpl<User> implements IUserService {
   
       @Autowired
       private IUserMapper iUserMapper;
   
       @Override
       protected BaseMapper<User> getBaseMapper() {
           return iUserMapper;
       }
   }
   

6. Create a mapper file (also interfaces with the same name)

   <?xml version="1.0" encoding="UTF-8" ?>
   <!DOCTYPE mapper
           PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
           "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
   
   <mapper namespace="com.wpj.mapper.IUserMapper">
       
       
   </mapper>
   

7. application.properties amended as application.yml

   spring:
     datasource:
       driver-class-name: com.mysql.jdbc.Driver
       url: jdbc:mysql://localhost:3306/day64-springboot-crud
       username: root
       password: 123456
   
   mybatis-plus:
     type-aliases-package: com.wpj.bean
     mapper-locations: classpath:mapper/*.xml
   

8. Open package scanning

   package com.wpj.day64springboot05crud;
   
   import org.mybatis.spring.annotation.MapperScan;
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   
   @SpringBootApplication(scanBasePackages = "com.wpj")
   @MapperScan(basePackages = "com.wpj.mapper")
   public class Day64Springboot05CrudApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(Day64Springboot05CrudApplication.class, args);
       }
   
   }
   

9. Test
   
   10. Test environment complete. . . . . . . I started doing CRUD.