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Fenris
 Post subject: Problem: Attributes in relation-tables
PostPosted: Mon May 10, 2004 4:23 am 
Newbie

Joined: Mon May 10, 2004 4:00 am
Posts: 3
Hi,

I have some trouble mapping a existing database to hibernate.
Currently there exists a set of tables looking like:

table1:
<id1><data1>

table2:
<id2><data2>

relation1:
<relation_id><id1><id2><attribute>

it is a many-to-many-relation.
Mapping the relation without the attribute is no problem, but i have no idea how-to add the attribute to the mapping.

I am using a idbag to do the mapping.

-----
for table1:
<idbag name="collectionname" table="relation1" cascade="all-delete-orphan"
lazy="false">
<collection-id type="int" column="relation_id">
<generator class="increment" />
</collection-id>
<key column="id1" />
<many-to-many column="id2"
class="className" />
</idbag>
------

perhaps anyone can give me a hint.

cheers!
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immanuel
 Post subject:
PostPosted: Mon May 10, 2004 5:21 am 
Regular
Regular

Joined: Tue Jan 13, 2004 4:57 am
Posts: 83
You can use a composite-element as a collection value. This is explained in the doc, and there are various options. One possibility is the following:

Code:
        <set name="relatedPartiesTo" lazy="true" inverse="true" table="PARTY_RELATIONSHIP">
            <key column="PARTY_ID_FROM"/>
            <composite-element class="it.esselunga.ecommerce.data.model.PartyRelationship">
                <property name="fromDate" column="FROM_DATE" type="java.sql.Timestamp" />
                <property name="throughDate" column="THRU_DATE" type="java.sql.Timestamp" />
                <property name="description" column="DESCRIPTION" type="java.lang.String" length="100" />
                <many-to-one name="relationshipType" class="it.esselunga.ecommerce.data.model.PartyRelationshipType">
                    <column name="RELATIONSHIP_TYPE_ID"/>
                </many-to-one>
                <many-to-one name="relatedParty" class="it.esselunga.ecommerce.data.model.Party" column="PARTY_ID_TO"/>
            </composite-element>
        </set>
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Fenris
 Post subject:
PostPosted: Mon May 10, 2004 11:33 am 
Newbie

Joined: Mon May 10, 2004 4:00 am
Posts: 3
Hi again,

i build my mapping like said above. But this created new problem:
When i don't create the mapping class ("PartyRelationship") in your example i'll get the error "no persister found for ...".
Ok so i created the class. But then the error "Batch run 0...insert into ( relation_id) values( Execution canceled..."

perhaps you can give me some more information how you create your classes etc.

cheers
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Fenris
 Post subject:
PostPosted: Mon May 10, 2004 11:57 am 
Newbie

Joined: Mon May 10, 2004 4:00 am
Posts: 3
Just found a solution:
i had to turn of cascading for the unmapped class (*Relationship here) and turn it on for the many-to-one relations.


cheers
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