Java / JPA：具有联接的命名本机查询会引发异常
[英]Java/JPA: Named Native Query with Join throws Exception
问题描述
In my Benutzer-Entity I have following OneToMany Relationship: 
在我的Benutzer-Entity我具有以下OneToMany关系：
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
@JoinColumn(name="BENUTZER_ID")
private List<Dokument> dokumente = new ArrayList<>();
In my Dokument-Entity I'd now like to get a specific Dokument by searching it by its hash-value and its foreign-key (BenutzerID) - I'm trying to do this by NamedNativeQuery : 现在，在我的Dokument-Entity我想通过按其hash-value和NamedNativeQuery foreign-key (BenutzerID)搜索特定的Dokument来进行操作-我正在尝试通过NamedNativeQuery ：
@NamedNativeQueries({
@NamedNativeQuery(
name="findDokumentByHashAndBenutzerID",
query="SELECT d.* FROM Dokument d "
+ "JOIN Benutzer b ON d.Benutzer_id = b.Id_Benutzer WHERE d.Benutzer_id = ? AND d.Hash = ?")
})
When I use this Query in my Database (H2) it works, but in Java i get following exception: 当我在数据库（H2）中使用此查询时，它可以工作，但是在Java中，出现以下异常：
javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: org.h2.jdbc.JdbcSQLException: Syntax Fehler in SQL Befehl "FINDDOKUMENTBYHASHANDBENUTZERID[ ] ";
1 个解决方案
解决方案1
0 已采纳 2018-10-23 07:27:16
Based on the exception I would guess that you call 根据例外情况，我猜您会打电话给
entityManager.createQuery("findDokumentByHashAndBenutzerID");
instead of 代替
entityManager.createNamedQuery("findDokumentByHashAndBenutzerID");
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