MyBatisPlus的简介及案例详解

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(1,'Tom','tom',3,'18866668888'); 
insert into user values(2,'Jerry','jerry',4,'16688886666'); 
insert into user values(3,'Jock','123456',41,'18812345678'); 
insert into user values(4,'hello','itcast',15,'4006184000');

<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>

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

public class User{
    private Long id;
    private String name;
    private String password;
    private Integer age;
    private String tel;
 
    //setter...getter...toString方法略
}

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

@SpringBootApplication 
//@MapperScan("com.itheima.dao") 
public class Mybatisplus01QuickstartApplication { 
 
    public static void main(String[] args) {
        SpringApplication.run(Mybatisplus01QuickstartApplication.class, args); 
    } 
}

@SpringBootTest 
class MpDemoApplicationTests { 
 
    @Autowired 
    private UserDao userDao; 
    @Test 
    public void testGetAll() { 
        List<User> userList = userDao.selectList(null); 
        System.out.println(userList); 
    } 
}