Basic Mapping

1. 단방향 Mapping: JPA의 가장 기본적인 Entity Mapping

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@Entity
@Table( name="someEntity")
public class someEntity {
	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long someEntityId;
	
	private String name;
	
	@OneToMany
	@JoinColumn(name = "someEntityId")
	private List<SourceEntity> sourceEntityList;
}

@Entity
@Table(name="sourceEntity")
public class SourceEntity {
	
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Long id;
	
	private String name;
}

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2. 양방향 Mapping: JPA의 가장 기본적인 Entity Mapping

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@Entity
@Table( name="someEntity")
public class someEntity {
	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;
	
	private String name;
	
	@OneToMany(mappedBy = "someEntity", cascade = CascadeType.ALL, fetch = FetchType.EAGER, orphanRemoval = true)
	private List<SourceEntity> sourceEntityList;
}

@Entity
@Table(name="sourceEntity")
public class SourceEntity {
	
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Long id;
	
	private String name;
    
        @ManyToOne 
        @JoinColumn(name = "someEntityId") 
        private SomeEntity someEntity;
}