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How can I create a unique constraint for 2 or 3 columns?

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kostas

Post subject: How can I create a unique constraint for 2 or 3 columns?

Posted: Sun Mar 06, 2005 4:49 pm

Newbie

Joined: Thu Jun 17, 2004 4:16 pm
Posts: 18

Hi all,

I am new to hibernate.

How can I create a unique constraint for a combination of two or three columns within mapping xml files?

I know how to declare a single property as unique but I don't know how to do the same with multiple columns.

Thank you in advance, kostas.

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zegloman

Post subject:

Posted: Sun Mar 06, 2005 4:52 pm

Newbie

Joined: Sun Mar 06, 2005 5:41 am
Posts: 13

unique="true" in your <property/> tag

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kostas

Post subject: How can I create a unique constraint for 2 or 3 columns?

Posted: Sun Mar 06, 2005 5:20 pm

Newbie

Joined: Thu Jun 17, 2004 4:16 pm
Posts: 18

zegloman wrote:

unique="true" in your <property/> tag

I know how to do that.

If you read my question you will understand that I want to create a unique constraint for multiple properties.

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michael

Post subject:

Posted: Sun Mar 06, 2005 5:23 pm

Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany

use <column unique-key="somename"/> on all properties.

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