Hibernate 映射 Map

/**
 * 此活动中每种座位与其对应价格的映射
 */
@ElementCollection(fetch = FetchType.EAGER)
@MapKeyColumn(name = "seat_id")
@Column(name = "seat_price", length = 150)
@CollectionTable(
		name = "t_package_order",
		joinColumns = {
				@JoinColumn(name = "schedule_id")
		}
)
private Map<SeatInfo, Double> seatPrices;