MyBatisPlus入门简介

陶然同学

发布于 2023-02-24 11:39:18

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发布于 2023-02-24 11:39:18

文章被收录于专栏：陶然同学博客

1. 入门案例

问题导入

1.1 SpringBoot整合MyBatisPlus入门程序

2. MyBatisPlus概述

问题导入

2.1 MyBatis介绍

1. 入门案例

问题导入

MyBatisPlus环境搭建的步骤？

1.1 SpringBoot整合MyBatisPlus入门程序

①：创建新模块，选择Spring初始化，并配置模块相关基础信息

②：选择当前模块需要使用的技术集（仅保留JDBC）

③：手动添加MyBatisPlus起步依赖

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.16</version>
</dependency

注意事项1：由于mp并未被收录到idea的系统内置配置，无法直接选择加入

注意事项2：如果使用Druid数据源，需要导入对应坐标

④：制作实体类与表结构

（类名与表名对应，属性名与字段名对应）

create database if not exists mybatisplus_db character set utf8;
use mybatisplus_db;
CREATE TABLE user (
            id bigint(20) primary key auto_increment,
            name varchar(32) not null,
            password  varchar(32) not null,
            age int(3) not null ,
            tel varchar(32) not null
);
insert into user values(null,'tom','123456',12,'12345678910');
insert into user values(null,'jack','123456',8,'12345678910');
insert into user values(null,'jerry','123456',15,'12345678910');
insert into user values(null,'tom','123456',9,'12345678910');
insert into user values(null,'snake','123456',28,'12345678910');
insert into user values(null,'张益达','123456',22,'12345678910');
insert into user values(null,'张大炮','123456',16,'12345678910');

public class User {
    private Long id;
    private String name;
    private String password;
    private Integer age;
    private String tel;
    //自行添加getter、setter、toString()等方法
}

⑤：设置Jdbc参数（application.yml）

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatisplus_db?serverTimezone=UTC
    username: root
    password: root

⑥：定义数据接口，继承BaseMapper

package com.itheima.dao;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.itheima.domain.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserDao extends BaseMapper<User> {
}

⑦：测试类中注入dao接口，测试功能

package com.itheima;

import com.itheima.dao.UserDao;
import com.itheima.domain.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
public class Mybatisplus01QuickstartApplicationTests {

    @Autowired
    private UserDao userDao;

    @Test
    void testGetAll() {
        List<User> userList = userDao.selectList(null);
        System.out.println(userList);
    }
}