MybatisPlus入门(二)MybatisPlus入门案例

一、 SpringBoot整合MyBatisPlus
SpringBoot整合MyBatisPlus 入门案例：

步骤一：

创建新模块，选择Spring初始化，并配置模块相关基础信息。选择当前模块需要使用的技术集（仅保留JDBC）

手动添加MyBatisPlus起步依赖：

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

步骤二：制作实体类与表结构

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
}

步骤三：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: 123456

步骤四：定义数据接口，继承BaseMapper

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.it.domain.User;
import org.apache.ibatis.annotations.Mapper;
 
@Mapper
public interface UserDao extends BaseMapper<User> {
}

步骤五：测试类中注入dao接口，测试功能

package com.it;
 
import com.it.dao.UserDao;
import com.it.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);
    }
}

运行单元测试，查看结果。