hi there, i have a tiny problem with correct 1:n mappings in hibernate. E.g. I have two tables, one table containing languagedescriptors in certain languages for "*_mldID" keys, which are stored in tables containing data which has to be shown in certain languages within the application.

e.g.

TABLE roles containing the following fields
roleID
roleName_mldID (Name of Role: is a unique ID for a set of language descriptors for roleName in the languagedescriptors Table)
roleFunction_mldID (Function of Role: is a unique ID for a set of language descriptors for roleFunction in the languagedescriptors Table)

TABLE languagedescriptors containing the following fields
languageDescriptorID (that's what the _mldID's point to)
languageID (the language of the languagedescriptor)
languageDescriptorValue (the value of the languagedescriptor)

e.g.



roleName_mldID = 2
|
|
2 | 1 Benutzer (german language, languageID=1)
2 | 2 User (englisch language, languageID=2)

roleFunction_mldID = 3
|
|
2 | 1 ein Internet-Benutzer(german language, languageID=1)
2 | 2 an internet user (englisch language, languageID=2)

the languageDescriptorID is referenced by the _mldID fields in the roles Table. I dont know how to get hibernate to understand that (in this case) there are two different 1:n mappings coming from the roles table referencing sets of descriptors in the languagedescriptors table.

the part of Roles.hbm.xml i'm currently using which dont work :( is:

<set
name="roleName_mlds"
lazy="true"
table="LanguageDescriptors">
<key column="languageDescriptorID"/>
<one-to-many class="net.someproject.LanguageDescriptorData"/>
</set>

i dont know where to tell hibernate that it has to use the roleName_mldID as key for its mapping and not the PK of the table Roles

Help !!!

Hi,

The solution is, I think, to use property-ref. But as far as I can remember, it must be used on the many-to-one side.

Could you post both mappings - if you can't figure out how property-ref would work in your case?

Erik

Roles.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="net.someproject.RoleData"
table="Roles">
<id name="roleID"
type="long">
<generator class="native"/>
</id>

<!--
mehrsprachige Bezeichner (Name des Rolle) (1:n)

here the roleName_mldID's missing !!! dont know where to put it (is that the property-ref?=)
-->
<set
name="roleName_mlds"
lazy="true"
table="LanguageDescriptors">
<key column="languageDescriptorID"/>
<one-to-many class="net.someproject.LanguageDescriptorData"/>
</set>

<!--
mehrsprachige Bezeichner (Funktion der Rolle) (1:n)

here the roleFunction_mldID's missing !!! dont know where to put it (is that the property-ref?=)
-->
<set
name="roleFunction_mlds"
lazy="true"
table="LanguageDescriptors">
<key column="languageDescriptorID"/>
<one-to-many class="net.someproject.LanguageDescriptorData"/>
</set>


</class>

</hibernate-mapping>

LanguageDescriptors.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="net.someproject.LanguageDescriptorData"
table="LanguageDescriptors">
<id name="languageDescriptorID"
type="long">
<generator class="native"/>
</id>
<property name="languageDescriptorValue" type="string"/>

<!--
Beziehung LanguageDescriptorData / LanguageData (n:1)
-->
<many-to-one
name="languageData"
column="languageID"
class="net.someproject.LanguageData"
/>

</class>

</hibernate-mapping>

Languages.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="net.someproject.LanguageData"
table="Languages">
<id name="languageID"
type="long">
<generator class="native"/>
</id>

<property name="languageShortcut" type="string"/>

</class>

</hibernate-mapping>