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Joins in HQL

Posted on 2009-05-10
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Last Modified: 2012-06-27
Hi,
I want to get data from two table by using a join. Since I am using Hibernate, I want to use HQL. Can someone please help me with writing joins in HQL?

Thanks.
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Question by:cuttieveenz
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Expert Comment

by:Murali Murugesan
ID: 24351026
establish the relationship using hibernate annotations or in the .hbm file and then do a normal hql to fetch the records which would automatically fetch the related records based on the join condition.

-Murali*
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tbsgadi earned 125 total points
ID: 24352601
Have a look at the following:

http://docs.huihoo.com/hibernate/hibernate-reference-3.2.1/queryhql.html
At the bottom there are examples

Good Luck!

Gary
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Assisted Solution

by:mohgupta
mohgupta earned 125 total points
ID: 24383007
You first need to the mapping file like hibernate.hbm.xml and then need to declare class for each table in dtatabase ,you wish to use. In config file define database connection properties "*.cfg.xml"

 In mapping file specify the relationship between class and the table i.e mapping class to table. For using joins on tables you need to specify relationships like "one to one", "one to many".

To create a query and execute you can write some thing like this:
 getSession().createquery("from class1,class2 where para1: =para2");
To save or update call -
getsession.saveorUpdate(class1);
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LVL 46

Expert Comment

by:tbsgadi
ID: 24620680
The question was "Can someone please help me with writing joins in HQL?"

Certainly in the link I gave there were enough examples to get the auther started.
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