Board ( 영속성의 전이 : cascade ) > SPRING_DATA_JPA

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package web.domain;

import java.util.HashSet;

import java.util.Set;

import jakarta.persistence.CascadeType;

import jakarta.persistence.Column;

import jakarta.persistence.Entity;

import jakarta.persistence.FetchType;

import jakarta.persistence.GeneratedValue;

import jakarta.persistence.GenerationType;

import jakarta.persistence.Id;

import jakarta.persistence.OneToMany;

import jakarta.persistence.Table;

import lombok.*;

@Entity

@Data

@ToString(exclude = "imageSet")

@Builder

@AllArgsConstructor

@NoArgsConstructor

@Table(name= "board")

public class Board extends BaseEntity {

@Id // primary key

@GeneratedValue(strategy = GenerationType.IDENTITY) // auto_increment

private Long bno;

@Column(length = 255, nullable = false) //칼럼의 저장 길이, null 허용 여부

private String title;

@Column(columnDefinition = "TEXT", nullable = false)

private String content;

@Column(length = 20, nullable = false)

private String writer;

//제목, 내용만 수정

public void change(String title, String content) {

this.title = title;

this.content = content;

}

@OneToMany(

mappedBy = "board", //BoardImage의 board변수

cascade = {CascadeType.ALL},

fetch = FetchType.LAZY //지연 로딩

)

@Builder.Default

private Set<BoardImage> imageSet =  new HashSet();

public void addImage(String uuid, String fileName) {

BoardImage boardImage = BoardImage.builder()

.uuid(uuid)

.fileName(fileName)

.board(this)

.ord(imageSet.size())

.build();

imageSet.add(boardImage);

}

public void clearImage() {

imageSet.forEach(boardImage -> boardImage.changeBoard(null));

this.imageSet.clear();

}

}