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        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.DruidDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatisplus_db?serverTimezone=UTCusername: rootpassword: 123456

步骤四：定义数据接口，继承BaseMapper

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> {
}

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

演示完成。