面向面试准备、在线测试、教程与实战练习的学习平台

通过聚焦学习路径、模拟测试和面试实战内容持续提升技能。

WithoutBook 将分主题面试题、在线练习测试、教程和对比指南整合到一个响应式学习空间中。

搜索资源库

面试准备

提问

模拟考试

设为首页

收藏此页面

Hibernate 面试题与答案

Test your skills through the online practice test: Hibernate Quiz Online Practice Test

问题 26. What is the difference between and merge and update?

Use update() if you are sure that the session does not contain an already persistent instance with the same identifier, and merge() if you want to merge your modifications at any time without consideration of the state of the session.

这有帮助吗？是否添加评论查看评论

问题 27. How do you define sequence generated primary key in hibernate?

Using <generator> tag.
Example:-
<id column="USER_ID" name="id" type="java.lang.Long">
<generator class="sequence">
<param name="table">SEQUENCE_NAME</param>
<generator>
</id>

这有帮助吗？是否添加评论查看评论

问题 28. Define cascade and inverse option in one-many mapping?

cascade enable operations to cascade to child entities.
cascade="all|none|save-update|delete|all-delete-orphan"
inverse mark this collection as the "inverse" end of a bidirectional association. inverse="true|false" Essentially "inverse" indicates which end of a relationship should be ignored, so when persisting a parent who has a collection of children, should you ask the parent for its list of children, or ask the children who the parents are?

这有帮助吗？是否添加评论查看评论

问题 29. What does it mean to be inverse?

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

这有帮助吗？是否添加评论查看评论

问题 30. What do you mean by Named - SQL query?

Named SQL queries are defined in the mapping xml document and called wherever required.
Example:
<sql-query name = "empdetails">
<return alias="emp" class="com.test.Employee"/>
SELECT emp.EMP_ID AS {emp.empid}, emp.EMP_ADDRESS AS {emp.address}, emp.EMP_NAME AS {emp.name} FROM Employee EMP WHERE emp.NAME LIKE :name
</sql-query>

Invoke Named Query :
List people = session.getNamedQuery("empdetails") .setString("TomBrady", name) .setMaxResults(50) .list();

这有帮助吗？是否添加评论查看评论

用户评价最有帮助的内容：

JDBC vs Hibernate	JPA vs Hibernate	Hibernate 3 vs Hibernate 4

通过聚焦学习路径、模拟测试和面试实战内容持续提升技能。

Hibernate 面试题与答案

相关差异对比

问题 26. What is the difference between and merge and update?

问题 27. How do you define sequence generated primary key in hibernate?

问题 28. Define cascade and inverse option in one-many mapping?

问题 29. What does it mean to be inverse?

问题 30. What do you mean by Named - SQL query?

WithoutBook