JPAJarThymeleaf-2 (양방향 연관관계 매핑)

1. Board

package com.rubypaper.board;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import lombok.Data;
import lombok.ToString;


@Data
@ToString(exclude="member")
@Entity
@Table(name="board1019")
public class Board {

	@Id
	@GeneratedValue
	private  Long seq;  
	private  String  title;
	private  String  content;
	@Temporal(value=TemporalType.TIMESTAMP)
	private  Date  createDate;	
	private  Long  cnt;		
	
	@ManyToOne
	@JoinColumn(name="MEMBER_ID", nullable=false)
	private Member  member;
	
	public  void  setMember(Member  member) {
		this.member = member;
		member.getBoardList().add(this);
	}
}

2. Member

package com.rubypaper.board;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import lombok.Data;
import lombok.ToString;

@Data
@ToString(exclude="boardList")
@Entity
@Table(name="Member1019")
public class Member {
	@Id
    @Column(name="MEMBER_ID")
	private  String id;
	private  String password;
	private  String name;
	private  String role;	
	
	@OneToMany(mappedBy="member", fetch=FetchType.EAGER, cascade=CascadeType.ALL)
	private  List<Board>  boardList = new ArrayList<Board>();
}

3.  testRelationMapping

package com.rubypaper.test;

import java.util.Date;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.rubypaper.board.Board;
import com.rubypaper.board.DynamicBoardRepository;
import com.rubypaper.board.DynamicMemberRepository;
import com.rubypaper.board.Member;


@RunWith(SpringRunner.class)
@SpringBootTest
public class RelationMappingTest {
	@Autowired
	private DynamicBoardRepository  boardRepo;	
	
	@Autowired
	private DynamicMemberRepository  memberRepo;	
		
		
	@Test
	public  void  testRelationMapping() {	
	    
		Member member1 =new Member();
		member1.setId("member1");
		member1.setName("소금빵");
		member1.setPassword("member111");
		member1.setRole("User");
		// memberRepo.save(member1);
		
		Member member2 =new Member();
		member2.setId("member2");
		member2.setName("앙버터");
		member2.setPassword("member222");
		member2.setRole("Admin");
		// memberRepo.save(member2);
		
		for(int i =1; i <=3; i++) {
			Board board=new Board();
			board.setMember(member1);
			board.setTitle("소금빵이 등록한 게시글 " + i);
			board.setContent("소금빵이 등록한 게시글 내용 " +i);
			board.setCreateDate(new Date());
			board.setCnt(1L);
			//  boardRepo.save(board);
		}
		memberRepo.save(member1);
	
		for(int i =1; i <=4; i++) {
			Board board=new Board();
			board.setMember(member2);
			board.setTitle("앙버터가 등록한 게시글 " + i);
			board.setContent("앙버터가 등록한 게시글 내용 " +i);
			board.setCreateDate(new Date());
			board.setCnt(2L);
			// boardRepo.save(board);
		}
		memberRepo.save(member2);
	}
}

>>

---

1. Member 수정. (One to many)

(Eager: 즉시 / Lazy :지연)

2. Board (Many to One) 는 디폴트로 잡혀있지만 적어준다면 .

>> 똑같이 나옴