MyBatis-Plus入门教程及基本API使用案例
作者:互联网
一、MyBatisPlus简介
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);
}
}
2. MyBatisPlus概述
问题导入
通过入门案例制作,MyBatisPlus的优点有哪些?