JPQL 无法连接表

Question

你能帮我加入这些 tables 人吗？我的 JPQL 查询不工作

@Query("Select bp, p from Perks as p, BokPerks as bp where bp.bookingID =:bookingID and bp.payment_id = p.id")
    List<Payment> getTEST(@Param("bookingId")long bookingID);

一个小时都解决不了，可能是一个简单的错误，但我已经屏蔽了一点:) Table BokPerks 实体：

'131', NULL, '2'
'131', NULL, '3'
'132', NULL, '1'
'132', NULL, '2'
'132', NULL, '3'
'15', '1', '4'
'33', '2', '1'
'33', '2', '2'
'33', '2', '3'
'38', '3', '4'

津贴table:

'1', 'lorem ipsum'
'2', '1234'
'3', 'hello '
'4', 'examples'

Answer 1

您的查询没有 JOIN。应该是这样的

@Query("Select bp, p from Perks as p INNER JOIN p.BokPerks as bp where tbp.bookingID =:bookingID and tbp.payment_id = p.id")

我写了INNER JOIN p.BokPerks，但实际上应该引用了属性的名称。没有你的实体就无法说出确切的语法类

假设 BokPerks 有 perk 个引用属性。那么查询应该是

from  BokPerks as bp INNER JOIN bp.perk as p

Answer 2

好吧，您可以简单地看到您在查询中使用了一个未知的 tbp 别名：

@Query("Select bp, p from Perks as p, BokPerks as bp where tbp.bookingID =:bookingID and tbp.payment_id = p.id")

你写了Select bp, p from Perks as p然后你写了where tbp.bookingID =:bookingID and tbp.payment_id = p.id

改为：

@Query("Select bp, p from Perks as p, BokPerks as bp where bp.bookingID =:bookingID and bp.payment_id = p.id")

JPQL 无法连接表

JPQL cannot join tables

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