JPQL 检查日期之间是否有空房

Question

我有一个日历和一个房间实体。

我的日历实体如下所示：

public class CalendarEntity {

    @EmbeddedId
    private CalendarId calendarId = new CalendarId();

    @Basic
    @Column(name = "available", nullable = false)
    private Boolean available;

    @Basic
    @Column(name = "price")
    private double price;

    @ManyToOne
    @JoinColumn(name = "room_id", referencedColumnName = "id", insertable = 
    false, updatable = false)
    private RoomEntity roomEntity;

}
    @Embeddable
    public class CalendarId implements Serializable {

        @Column(name= "date", nullable = false)
        private Date date;

        @Column(name = "room_id", nullable = false)
        private Integer room_id;
}

我的房间实体如下所示：

public class RoomEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    @Column(name = "id", nullable = false, unique = true)
    private Integer id;
}

假设我在日历实体中有一些日期为 2017-10-5 的条目， 2017-10-6、2017-10-7、2017-10-8 room_id=10.

我想构造一个查询，这样如果用户询问具有特定入住和退房日期的房间，那么他将获得正确的房间列表。

我该怎么做？

例如，用户要求checkin=2017-10-6和checkout=2017-10-8的房间，房间应该出现在列表中。

应该查询什么才能获得正确的房间列表？

更新：

我现在的查询只检查房间在入住日期和退房日期是否可用，而不是在两者之间：

select r from RoomEntity r where r.id in (Select c1.calendarId.room_id from CalendarEntity c1, CalendarEntity c2 where (c1.calendarId.room_id = c2.calendarId.room_id)  and (c1.calendarId.date =:checkin and c1.available=true) and(c2.calendarId.date =:checkout and c2.available=true))

Answer 1

一种方法是：SELECT count(c.calendarId.room_id), c.calendarId.room_id FROM CalendarEntity c WHERE c.available = true and c.calendarId.date BETWEEN :checkin and : checkout GROUP BY c.calendarId.room_id HAVING count(c.calendarId.room_id) >= :noOfDays noODays 表示从需要预订的入住日期和退房日期计算的天数。

Answer 2

SELECT r FROM RoomEntity r 
WHERE r.id 
in (select c1.calendarId.room_id 
    FROM CalendarEntity c1 JOIN CalendarEntity c2 
    WHERE c1.calendarId.room_id = c2.calendarId.room_id  
    AND ((c1.calendarId.date BETWEEN :checkin AND :checkout) 
         AND (c1.available=true and c2.available=true));

JPQL 检查日期之间是否有空房

JPQL checkif room is available between dates

java

mysql

sql

jpa

jpql