入门案例

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

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/dp1?useUnicode=true&characterEncoding=utf-8
    username: root
    password: root

-- 创建person表
CREATE TABLE person(
 id BIGINT PRIMARY KEY auto_increment, -- 主键id
  name VARCHAR(20), -- 姓名
	password VARCHAR(40), -- 密码
	age VARCHAR(20), -- 年龄
	tel VARCHAR(40) -- 电话
);
-- 添加数据
INSERT INTO person VALUES (NULL,'张三',4243,13,142424),(NULL,'李四',3256,16,145623),(NULL,'王五',9256,20,197864);

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Person {
    private Long id;
    private String name;
    private String password;
    private String age;
    private String tel;
}

@Mapper
public interface PersonDao extends BaseMapper<Person> {

}

@SpringBootTest
class MybatisPlus01ApplicationTests {
    @Autowired
    private PersonDao personDao;

    @Test
    void testGetAll() {
        List<Person> personList = personDao.selectList(null);
        System.out.println(personList);
    }
}

MyBatisPlus特性

标准数据层CRUD功能

@Test
    void testSave(){
        Person person = new Person();
        person.setName("后端程序员");
        person.setPassword("icpc");
        person.setAge("12");
        person.setTel("673512");
        personDao.insert(person);
    }

@Test
    void testDelete(){
        personDao.deleteById(1607368447103193090L);
    }

@Test
    void testUpdate(){
        Person person = new Person();
        person.setId(1L);
        person.setName("Tom777");
        personDao.updateById(person);
    }

@Test
    void testGetById(){
        Person person = personDao.selectById(2L);
        System.out.println(person);
    }