Solved

primary key in hibernate

Posted on 2008-10-09
2
782 Views
Last Modified: 2013-11-24
how to distinguish primary with other keys in hibernate in java bean class? is id is important? or id stand for primary key?

The id property holds a unique identifier value for a particular event what it means?
0
Comment
Question by:priyapratheep
2 Comments
 
LVL 9

Expert Comment

by:darkapple
Comment Utility
id refers primary key in java bean classes. id is of utmost important because id is the main property which distinguishes one persistent object from another persistent object. id is the representative of a object in a class.

hope this gives you some idea.
0
 
LVL 2

Accepted Solution

by:
themuppeteer earned 500 total points
Comment Utility
when you have a database with multiple rows, you need something to make each row unique. That is the primary key (can be one field or multiple together)
When you want to persist your object (=store it in the database) id is what makes your object unique in the
...and in case you use JPA you add @id above the variable or the getter function to show which field you want to use for this.

hope this helps


http://users.telenet.be/free_quiz
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
fizzArray3  challenge 1 64
topping1 challenge 7 47
HashMap Vs TreeMap 12 47
thymeleaf natural templating vs JSP 2 22
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
The viewer will learn how to implement Singleton Design Pattern in Java.
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now