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garfield
 Post subject: mapping
PostPosted: Thu Apr 05, 2007 9:28 am 
Newbie

Joined: Tue Mar 27, 2007 6:30 am
Posts: 12
I am muddling my way through NHibernate and was wondering if it is possible to map an objecy across multiple tables.

For example, I have inherited a data structure with a customer table and an address table.

A customer can only have one address, so would like to map it into one object that combines the data from both tables.

can this be mapped?
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Monster in the sky
 Post subject:
PostPosted: Thu Apr 05, 2007 10:03 am 
Newbie

Joined: Tue Apr 03, 2007 11:29 am
Posts: 4
Two to do this :
-> the worst : using a bag and composite-element
-> or using joined-subclass (cf. NHibernate reference documentation, Chapter 8 )

Here is an example :


Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Dppr.Biologie.Transport" assembly="Dppr.Biologie">
   <class name="Resultat" table="T_RESULTAT" lazy="false">
      <id name="Identifiant" column="RES_ID_N" type="Int32" unsaved-value="0">
         <generator class="native"/>
      </id>
      <many-to-one column="TES_ID_N" class="Test" name="Test" unique="true" />
      <joined-subclass name="ResultatTexte" table="T_RESULTAT_TEXTE">
         <key column="RES_ID_N" />
         <property column="RET_VALEUR_C" type="String" name="Valeur" />
      </joined-subclass>
      <joined-subclass name="ResultatNumerique" table="T_RESULTAT_NUMERIQUE">
         <key column="RES_ID_N" />
         <property column="REN_VALEUR_N" type="Double" name="Valeur" />
      </joined-subclass>
      <joined-subclass name="ResultatCode" table="T_RESULTAT_CODE">
         <key column="RES_ID_N" />
         <property column="REC_CODE_C" type="String" name="Code" />
         <property column="REC_LIBELLE_C" type="String" name="Libelle" />
         <property column="REC_TABLE_C" type="String" name="Table" />
      </joined-subclass>
   </class>
</hibernate-mapping>
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Gortok
 Post subject: Re: mapping
PostPosted: Thu Apr 05, 2007 11:11 am 
Regular
Regular

Joined: Sun Jan 21, 2007 4:33 pm
Posts: 65
garfield wrote:
I am muddling my way through NHibernate and was wondering if it is possible to map an objecy across multiple tables.

For example, I have inherited a data structure with a customer table and an address table.

A customer can only have one address, so would like to map it into one object that combines the data from both tables.

can this be mapped?


Question: Why not map it as a one-to-one relationship? The end result is essentially the same, you just end up creating an Address object whose id points to Customer.
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Monster in the sky
 Post subject:
PostPosted: Thu Apr 05, 2007 11:29 am 
Newbie

Joined: Tue Apr 03, 2007 11:29 am
Posts: 4
If you use a one-to-one relationship you should have 2 hbm files and i think that joined-subclass are less constrained than one-to-one properties.
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