[spring boot] JPA와 H2 데이터베이스로 간단한 게시판 만들기

package com.green.dto;
                                                                                                                                                                              
import jakarta.persistence.Column;                                                                                                                                            
import jakarta.persistence.Entity;                                                                                                                                            
import jakarta.persistence.GeneratedValue;                                                                                                                                    
import jakarta.persistence.Id;                                                                                                                                                
                                                                                                                                                                              
//실제 데이터 베이스의 table 구조를 만든다 : Create table 명령을 실행                                                                                                                             
@Entity                                                                                                                                                                       
public class Article {                                                                                                                                                        
// primary key : @Id                                                                                                                                                      
// 번호자동증가 : @GeneratedValue                                                                                                                                               
@Id                                                                                                                                                                       
@GeneratedValue                                                                                                                                                           
private Long id; // Long : long 이 아닌 이유 - null 저장                                                                                                                         
                                                                                                                                                                          
@Column                                                                                                                                                                   
private String title;                                                                                                                                                     
                                                                                                                                                                          
@Column                                                                                                                                                                   
private String content;                                                                                                                                                   
                                                                                                                                                                              
public Article(Long id, String title, String content) {                                                                                                                   
this.id = id;                                                                                                                                                         
this.title = title;                                                                                                                                                   
this.content = content;                                                                                                                                               
}                                                                                                                                                                         
                                                                                                                                                                          
                                                                                                                                                                              
                                                                                                                                                                          
                                                                                                                                                                              
}            
@Entity -> Create table
테이블 명 Article