文本，使用SpringBoot工程创建一个Mybatis-plus项目,Mybatis-plus在编写数据层接口，用extends BaseMapper＜User＞继承实体类

1. package file;
2. 
3. import org.springframework.boot.SpringApplication;
4. import org.springframework.boot.autoconfigure.SpringBootApplication;
5. 
6. 
7. @SpringBootApplication
8. public class HelloApplication {
9. public static void main(String[] args) {
10. SpringApplication.run(HelloApplication.class, args);
11.         }
12.     }
13.

package file;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 
    @SpringBootApplication
    public class HelloApplication {
        public static void main(String[] args) {
            SpringApplication.run(HelloApplication.class, args);
        }
    }
 

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/big_event?serverTimezone=UTC
    username: 
    password:
mybatis:
  configuration:
    map-underscore-to-camel-case: true #开启驼峰命名和下划线命名的自动转换
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
server:
  port: 9090