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JPA辅助表问题

[英]JPA Secondary Table Issue

原文 2010-01-31 20:04:11 9 1 java/ hibernate/ orm/ jpa/ jointable

I have a three tables: User, Course, and Test. 我有三个表：“用户”，“课程”和“测试”。

Course has a User foreign key and Test has a Course foreign key. 课程具有用户外键，而测试具有课程外键。 I am having trouble mapping the Test collection for each User since I need an intermediary step from User -> Course -> Test. 我在为每个用户映射Test集合时遇到了麻烦，因为我需要从User-> Course-> Test进行一个中间步骤。 I am trying to use a SecondaryTable since the User key for the Test is its associated Course row. 我正在尝试使用SecondaryTable，因为“测试”的“用户”键是其关联的“课程”行。

Am I on the right track using SecondaryTable or is there a way to use a JoinTable without the inverseJoinColumn? 我是否使用SecondaryTable处于正确的轨道，或者是否可以使用没有inverseJoinColumn的JoinTable？

1 个解决方案

Am I on the right track using SecondaryTable or is there a way to use a JoinTable without the inverseJoinColumn? 我是否使用SecondaryTable处于正确的轨道，或者是否可以使用没有inverseJoinColumn的JoinTable？

I don't think so, specifying secondary tables indicates that the entity's persistent data is stored across multiple tables, which is not exactly the case here. 我不这么认为，指定辅助表表示实体的持久性数据存储在多个表中，在此情况并非如此。

But it's hard to say more without seeing your entities, the relationships. 但是，如果不查看您的实体和关系，很难说更多。 And by the way, do you have the control of the database (ie can you change things)? 顺便说一句，您是否拥有数据库的控制权（即您可以更改内容）？

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JPA - 辅助表映射方向 - JPA - Secondary Table mapping direction

是否可以在jpa中的辅助表上设置鉴别器列 - Is it possible to have discriminator column on secondary table in jpa

Spring JPA-OneToOne不从辅助表中选择数据-MySQL - Spring jpa - oneToOne not selecting data from secondary table - mySql

JPA：使用组合键从辅助表中检索列表 - JPA: Retrieve a list from secondary table using a composite key

JPA 辅助表导致外键限制的错误原因 - JPA Secondary table causes error cause of Foreign Key restriction

JPA @ManyToOne联接表问题 - JPA @ManyToOne join table issue

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JPA-ManyToMany 关系删除操作从辅助表中删除所有实体 - JPA- ManyToMany relation the delete operation removes all entities from secondary table

JPA 辅助表作为只读视图 - 休眠仍尝试插入行 - JPA secondary table as read only view - hibernate still tries to insert rows

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