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Einfache 1:n Beziehung

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Neu_Hibernate_Newbie

Post subject: Einfache 1:n Beziehung

Posted: Thu May 24, 2007 4:39 am

Newbie

Joined: Wed May 16, 2007 9:55 am
Posts: 8

Hallo,
ich versuche gerade eine einfache 1:n Beziehung zu erstellen. D.h. ein Nutzer hat die Möglichkeit n Nachrichten zu schreiben. Ich habe Probleme die Tabellen zu verknüpfen, weil ich nicht genau weiß welche Angaben ich machen muss. Es wäre sehr nett, wenn mir jemand ein paar Tips geben könnte!

Aktuell erhalte ich folgende Fehlermeldung:
Association references unmapped class: Mitteilungen

Nutzer.hbm.xml

Code:

<hibernate-mapping>
    <class name="de.jsfpraxis.friends.model.Nutzer" table="NUTZER" schema="PUBLIC">   
        
        <id name="id" type="int">
            <column name="ID" />
            <generator class="identity" />
        </id>
        
        <property name="vorname"     type="string"  length="30" />
        <property name="nachname"    type="string"  length="30" />
        ...
        
         <set name="mitteilungen" inverse="true">
            <key>
                <column name="ID" not-null="true" />
            </key>
                <one-to-many class="Mitteilungen" />
   </set>

        </class>
</hibernate-mapping>

Mitteilungen.hbm.xml

Code:

<hibernate-mapping>
   <class name="de.jsfpraxis.friends.model.Mitteilungen"
      table="Mitteilungen" schema="PUBLIC">

      <id name="id" type="int">
         <column name="ID" />
         <generator class="identity" />
      </id>
      
       <many-to-one name="nutzer" class="Nutzer">
                     <column name="ID" not-null="true" />
                 </many-to-one>

      <property name="empfaenger" type="string" length="30" />
      <property name="gesendeteNachricht" type="string" length="400" />
   
   </class>
</hibernate-mapping>

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Neu_Hibernate_Newbie

Post subject: Hier die Lösung für alle die es interessiert,...

Posted: Sat May 26, 2007 10:10 am

Newbie

Joined: Wed May 16, 2007 9:55 am
Posts: 8

Habe das Problem so lösen können:

Code:

<hibernate-mapping>
    <class name="de.jsfpraxis.friends.model.Mitteilungen" table="MITTEILUNGEN" schema="PUBLIC">
        <id name="id" type="int">
            <column name="ID" />
            <generator class="identity" />
        </id>
        <many-to-one name="nutzer" class="de.jsfpraxis.friends.model.Nutzer" fetch="select">
            <column name="NUTZER_ID" not-null="true" />
        </many-to-one>
        <property name="empfaenger" type="string">
            <column name="EMPFAENGER" length="30" not-null="true" />
        </property>
        <property name="gesendetenachricht" type="string">
            <column name="GESENDETENACHRICHT" length="400" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

Code:

<hibernate-mapping>
    <class name="de.jsfpraxis.friends.model.Nutzer" table="NUTZER" schema="PUBLIC">
        <id name="id" type="int">
            <column name="ID" />
            <generator class="identity" />
        </id>
    
        <property name="vorname" type="string">
            <column name="VORNAME" length="30" not-null="true" />
        </property>
        <property name="nachname" type="string">
            <column name="NACHNAME" length="30" not-null="true" />
        </property>
        ...
        <set name="mitteilungens" inverse="true">
            <key>
                <column name="NUTZER_ID" not-null="true" />
            </key>
            <one-to-many class="de.jsfpraxis.friends.model.Mitteilungen" />
        </set>
    </class>
</hibernate-mapping>

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