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面试准备

Hibernate 面试题与答案

Question: What does it mean to be inverse?

Answer: It informs hibernate to ignore that end of the relationship. If the one-to-many was marked as inverse, hibernate would create a child->parent relationship (child.getParent). If the one-to-many was marked as non-inverse then a child->parent relationship would be created.

In Hibernate, only the �relationship owner� should maintain the relationship, and the �inverse� keyword is created to defines which side is the owner to maintain the relationship. However the �inverse� keyword itself is not verbose enough, I would suggest change the keyword to �relationship_owner�.

In short, inverse=�true� means this is the relationship owner, and inverse=�false� (default) means it�s not.

Suppose Stock is parent and StockDailyRecords is Child object.

Inverse keyword is applied in one to many relationship. Here�s the question, if save or update operation perform in �Stock� object, should it update the �stockDailyRecords� relationship?

1. inverse=�true�

If inverse=�true� in the set variable, it means �stock_daily_record� is the relationship owner, so Stock will NOT UPDATE the relationship.

2. inverse=�false�

If inverse=�false� (default) in the set variable, it means �stock� is the relationship owner, and Stock will UPDATE the relationship.

If keyword �inverse� is not define, the inverse = �false� will be used, which is

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