无法使用JOIN查询实体

Question

我正在努力弄清 HQL ，并在IntelliJ IDEA的Persistence窗口中运行它。

这就是问题：我可以运行像这样的简单查询：

hql> SELECT offer FROM OfferEntit offer;
hql> SELECT offer FROM OfferEntit offer WHERE offer.id = 1L; 

但是如果我添加类似JOIN的内容：

hql> SELECT offer FROM OfferEntit offer 
     JOIN offer.owner AS owner WHERE owner.id = 1L;

我得到一个空结果。总是。不管我做什么。我不知道为什么。

---

也

• 我检查了这些记录是否存在-是的
• 我没有收到任何错误日志

Answer 1

您可以尝试左联接还是联接提取

SELECT offer FROM OfferEntit offer 
 LEFT JOIN offer.owner AS owner WHERE owner.id = 1L

---

SELECT offer FROM OfferEntit offer 
 JOIN FETCH offer.owner AS owner WHERE owner.id = 1L