정훈's 프로그래밍

Spring MVC에서 Service 레이어를 interface와 implements로 나누는 이유와 장점을 설명해드리겠습니다.1. 느슨한 결합도 (Loose Coupling)- interface를 사용하면 실제 구현체(implements)와 이를 사용하는 클래스 간의 결합도가 낮아집니다.- 예를 들어, Controller는 ServiceImpl의 구체적인 내용을 알 필요 없이 interface만 알면 됩니다.2. 유연성과 확장성public interface UserService { User findUser(Long id);}public class UserServiceImpl implements UserService { public User findUser(Long id) { //..

spring.application.name=demo# Spring MVCspring.mvc.view.prefix=/WEB-INF/views/spring.mvc.view.suffix=.jsp# MYSQLspring.datasource.url=jdbc:mysql://127.0.0.1:3306/springspring.datasource.username=rootspring.datasource.password=rootspring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver# JPAspring.jpa.hibernate.ddl-auto=updatespring.jpa.show-sql=truespring.jpa.properties.hibernate.format_sql=..

docker run -d \ --name mysql-container \ -e MYSQL_ROOT_PASSWORD=my-secret-pw \ -e MYSQL_DATABASE=my-database \ -e MYSQL_USER=user \ -e MYSQL_PASSWORD=password \ -p 3306:3306 \ -v mysql-data:/var/lib/mysql \ mysql:8.0### 명령어 설명:1. **`-d`**: 컨테이너를 백그라운드에서 실행 (데몬 모드)2. **`--name`**: 컨테이너 이름 지정 (`mysql-container`)3. **환경 변수**:   - `MYSQL_ROOT_PASSWORD`: 루트 비밀번호 (필수)   - `MYSQL_DATABASE`: 생성할..