1.创建项目，导入依赖

	<!--mybatisplus依赖-->
	<dependency>
		<groupId>com.baomidou</groupId>
		<artifactId>mybatis-plus-boot-starter</artifactId>
		<version>3.4.3.1</version>
	</dependency>
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>5.1.47</version>
	</dependency>
</dependencies>

2. 创建实体类

@Data
public class User {

    private Long id;
    private String name;
    private Integer age;
    private String email;
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date modifyTime;
}

3.创建mapper接口

创建的mapper接口需要继承BaseMapper并设置类型为实体类型，这样就能根据实体类名与数据库表绑定了。

@Repository
public interface UserMapper extends BaseMapper<User> {

}

4.包扫描

在springboot主启动类上添加mapperScan("")注解将mapper加入到spring容器中。

@SpringBootApplication
@MapperScan("com.example.mybatisplusexample.mapper")
public class MybatisplusExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(MybatisplusExampleApplication.class, args);
    }
}

5.测试

@SpringBootTest
class MybatisplusExampleApplicationTests {
    @Autowired
    private UserMapper userMapper;
    @Test
    void contextLoads() {
        System.out.println(("----- selectAll method test ------"));
        List<User> userList = userMapper.selectList(null);
        userList.forEach(System.out::println);
       //插入：主键非空会根据雪花算法生成一个唯一的id
        User user=new User();
        user.setAge(21);
        user.setEmail("233");
        user.setName("zhangsan");
        userMapper.insert(user);
    }
}