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how to use hibernate criteria to select from multiple tables

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ligerdave

Post subject: how to use hibernate criteria to select from multiple tables

Posted: Thu Jan 14, 2010 8:29 pm

Newbie

Joined: Sat Mar 18, 2006 1:27 am
Posts: 15

hi all,

i wonder how the criteria looks like when it comes to select records from two tables joined by the key

should look like this in sql:

Code:

select * from tableA a, tableB b
where a.id = b.fk_id
and .........

anyone?
if there isn't a method that allows to do so, is there another solution?

plz help

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gaur

Post subject: Re: how to use hibernate criteria to select from multiple tables

Posted: Fri Jan 15, 2010 6:43 am

Beginner

Joined: Wed Jan 07, 2009 7:07 pm
Posts: 26

use Criteria.createAlias()

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ligerdave

Post subject: Re: how to use hibernate criteria to select from multiple tables

Posted: Fri Jan 15, 2010 10:16 am

Newbie

Joined: Sat Mar 18, 2006 1:27 am
Posts: 15

can you please give an example?

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gaur

Post subject: Re: how to use hibernate criteria to select from multiple tables

Posted: Fri Jan 15, 2010 6:33 pm

Beginner

Joined: Wed Jan 07, 2009 7:07 pm
Posts: 26

Code:

getSession().createCriteria(A.class).createAlias("B","BAlias");

Along with this you have to specify the relation between A and B in hbm file.Where your specify the FK.

for e.g if A has many to one relation with B you can specify this in your hbm :

<many-to-one name="B" class="B" fetch="select">
<column name="FK_ID" />
</many-to-one>

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ligerdave

Post subject: Re: how to use hibernate criteria to select from multiple tables

Posted: Fri Jan 15, 2010 6:40 pm

Newbie

Joined: Sat Mar 18, 2006 1:27 am
Posts: 15

Thank you very much man! I will give it a shot shortly.

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