HQL/JPA找到日期範圍內的可用項目

Question

這是汽車租賃應用程序。 我有表：

+-------------------------------------+ 
|id |start_date |end_date |car_id| 
+----+------------+------------+------+ 
|1 |2017-04-01 |2017-04-10 |1  | 
|2 |2017-04-15 |2017-04-20 |1  | 
|3 |2017-04-15 |2017-04-20 |2  | 
+----+------------+------------+------+ 

用於查找用戶輸入「userDateStart」和「userDateEnd」之間的所有可用汽車的Hibernate查詢。

select 
b.id, b.startDate, b.endDate, b.car.id 
from BorrowedDate as b 
where :userDateStart not between startDate and endDate 
and :userDateEnd not between startDate and endDate 

------------ 
:userDateStart = 2017-04-02 00:00:00 
:userDateEnd = 2017-04-10 00:00:00 

我的結果是：因爲車ID = 1這個時間是借來的

+-------------------------------------+ 
|id |start_date |end_date |car_id| 
+----+------------+------------+------+ 
|2 |2017-04-15 |2017-04-20 |1  | 
|3 |2017-04-15 |2017-04-20 |2  | 
+----+------------+------------+------+ 

結果是錯誤的。只有car_id = 2應該可用。

Answer 1

我看到您的查詢是正確的。

但是，如果你要根據車輛ID來選擇，所以你應該添加車ID作爲條件太到你的查詢

例如

SELECT b.id, b.startDate, b.endDate, b.car.id 
FROM BorrowedDate b 
WHERE :userDateStart NOT BETWEEN b.startDate AND b.endDate 
AND :userDateEnd NOT BETWEEN b.startDate AND b.endDate 
AND b.car.id = :carId 

或者你可以那樣做太

SELECT b.id, b.startDate, b.endDate, c.id 
FROM BorrowedDate b INNER JOIN b.car c 
WHERE :userDateStart NOT BETWEEN b.startDate AND b.endDate 
AND :userDateEnd NOT BETWEEN b.startDate AND b.endDate 
AND c.id = :carId 

，那麼你必須通過：carId值等於2

UPDATE

，如果你需要得到結果的動態，你可以試試這個SQL查詢，我會很快與JPQL更新

SELECT b.id, b.startDate, b.endDate, b.car.id 
FROM BorrowedDate b 
WHERE '2017-04-02 00:00:00' NOT BETWEEN b.startDate AND b.endDate 
AND '2017-04-10 00:00:00' NOT BETWEEN b.startDate AND b.endDate 
AND b.car.id NOT IN (SELECT DISTINCT bd.car.id FROM BorrowedDate bd WHERE '2017-04-02 00:00:00' BETWEEN bd.startDate AND bd.endDate OR '2017-04-10 00:00:00' BETWEEN bd.startDate AND bd.endDate) 

這裏有JPQL太

SELECT model.id, model.startDate, model.endDate, model.car.id 
FROM BorrowedDate model 
WHERE :userDateStart NOT BETWEEN model.startDate AND model.endDate 
AND :userDateEnd NOT BETWEEN model.startDate AND model.endDate 
AND model.car.id NOT IN (SELECT DISTINCT b.car.id FROM BorrowedDate b WHERE :userDateStart BETWEEN b.startDate AND b.endDate OR :userDateEnd BETWEEN b.startDate AND b.endDate) 

Answer 2

我認爲你正在尋找一個完全重疊的時期。這是完全重疊正確的邏輯：

select b.id, b.startDate, b.endDate, b.car.id 
from BorrowedDate as b 
where :userDateStart <= startDate and 
     :userDateEnd >= endDate; 

所以，這可以讓你所租用的客戶希望一個整個週期的汽車。這可能不是你的意圖。

讓我假設你想要的汽車在此期間可用。對於這一點，讓我假設你有一個cars表：

select c.* 
from cars as c 
where not exists (select 1 
        from borrowed b 
        where :userDateStart <= endDate and 
         :userDateEnd >= startDate 
       ); 

注：這是標準的（ISH）SQL。 Hibernate有一些不尋常的約定，但這個想法應該是一樣的。