Repated column in mapping for class

hcfk · **Posted:** Tue Jul 03, 2007 2:17 pm

Here is the mapping file :

Code:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" assembly="eProSayman.Dao" namespace="eProSayman.Domain">
  <class name="DemirbasSayimBilgisi" table="T_DEMIRBAS_SAYIM_BILGISI">
    <id name="Id" column="ID" type="Int64"  unsaved-value="0">
      <generator class="native"/>
    </id>
    <property column="IsActive" type="Boolean" name="IsActive" length="1" />

    <many-to-one name="Demirbas"  class="Demirbas"/>

    <component name="EldekiMiktar" insert="true" update="true" class="Miktar" >
      <property name="Eder" type="float" update="true" insert="true" />
      <many-to-one name="OlcuBirimi"  class="OlcuBirimi"/>
    </component>

    <component name="KullanimMiktari"  insert="true" update="true" class="Miktar">
      <property name="Eder" type="float" update="true" insert="true" />
      <many-to-one name="OlcuBirimi"  class="OlcuBirimi"/>
    </component>

    <component name="DepodakiMiktar" insert="true" update="true" class="Miktar">
      <property name="Eder" type="float" update="true" insert="true" />
      <many-to-one name="OlcuBirimi"  class="OlcuBirimi"/>
    </component>

    <component name="SayimMiktari" insert="true" update="true" class="Miktar">
      <property name="Eder" type="float" update="true" insert="true" />
      <many-to-one name="OlcuBirimi"  class="OlcuBirimi"/>
    </component>

    <component name="EksikMiktar" insert="true" update="true" class="Miktar">
      <property name="Eder" type="float" update="true" insert="true" />
      <many-to-one name="OlcuBirimi"  class="OlcuBirimi"/>
    </component>

    <component name="FazlaMiktar" insert="true" update="true" class="Miktar">
      <property name="Eder" type="float" update="true" insert="true" />
      <many-to-one name="OlcuBirimi"  class="OlcuBirimi"/>
    </component>
    
    <component name="ToplamFiyat" insert="true" update="true" class="Fiyat">
      <property name="Tutar" type="double" update="true" insert="true" />
      <many-to-one name="ParaBirimi"  class="ParaBirimi"/>
    </component>
    
  </class>
</hibernate-mapping>

i cannot understand the reason

karlchu · **Posted:** Tue Jul 03, 2007 2:22 pm

What are you asking? Please read this first:
http://www.hibernate.org/ForumMailingli ... AskForHelp

hcfk · **Posted:** Tue Jul 03, 2007 3:02 pm

i do want to know how a component class may be referenced in a class multiple times. In hibernate i can do this but in nhibernate i did not manage.

karlchu · **Posted:** Tue Jul 03, 2007 3:17 pm

The Eder property of all the components (except ToplamFiyat) map to the same database column; namely, the Eder column because it was not specified otherwise with the column attribute. I am not overly familiar with Hibernate, and I am quite sure such mapping is not allowed in Hibernate as it is not allowed in NHibernate with one exception. The exception is that amongst all properties mapped to the same column, only one of them can be marked update="true" and insert="true"; all others must be marked update="false" and insert="false".

Note: the fact that the properties are declared inside components is irrelevant; they still all map to the same column in the same database table.

hcfk · **Posted:** Tue Jul 03, 2007 4:48 pm

The main problem is not declaring the column name for the properties of the component. the problem is solved by declaring differentiating the column names.