Entity One-to-Many 通過映射表關聯

@Entity
@Table(name = "t_order")
public class Order {

	@Id @GeneratedValue
	private Long id;
	
	@Temporal(TemporalType.TIMESTAMP)
	private Date createDate;
	
	/**
	 * 通過映射表ORDER_ORDER_LINE進行一對多關聯。
	 */
	@OneToMany(cascade = {CascadeType.PERSIST})
	@JoinTable(name = "order_order_line", 
		joinColumns = @JoinColumn(name = "order_id"),
		inverseJoinColumns = @JoinColumn(name = "order_line_id"))
	private List<OrderLine> orderLines;
	
	// Constructors, getters, setters
}

 

@Entity
@Table(name = "order_line")
public class OrderLine {

	@Id @GeneratedValue
	private Long id;
	private String item;
	private Double unitPrice;
	private Integer quantity;
	
	// Constructors, getters, setters
}

 

CREATE TABLE T_ORDER (
	ID BIGINT,
	CREATEDATE TIMESTAMP,
	PRIMARY KEY (ID)
);

CREATE TABLE ORDER_LINE (
	ID BIGINT,
	ITEM VARCHAR(50),
	UNITPRICE DOUBLE,
	QUANTITY INTEGER,
	PRIMARY KEY (ID)
);

CREATE TABLE ORDER_ORDER_LINE (
	ORDER_ID BIGINT,
	ORDER_LINE_ID BIGINT,
	PRIMARY KEY (ORDER_ID, ORDER_LINE_ID),
	FOREIGN KEY (ORDER_ID) REFERENCES T_ORDER(ID),
	FOREIGN KEY (ORDER_LINE_ID) REFERENCES ORDER_LINE(ID)
);