Re: [Hibernate-devel] Please help with 1:n relationship

[Marco P. <mp...@cm...>]

Gavin,

> the key column of the many-valued end must match the column of
> the single-valued end. Hope that makes sense.....
To summarize
- A client has multiple orders and an order has only one client --
- Client class has a clientId
- Order class a orderID

- At this moment i see a referral from the many-valued site (Order)
to the one site (Client)
	<many-to-one name="Client" column="clientId" class="com.mticket.Client"/>
but the referal from the single-value, is not yet clear..
	<set role="besteld" readonly="true">
		--> makes sense!
        	<key column="clientId"/>
		--> Is this the key column you mentioned ?
		Why does this refer to the clientId, looks like a self-referal!
         	<one-to-many class="com.mticket.Order"/>
		--> makes sense!
     	</set>

Do i need to have other property things in my classes to hold the
correct referals? Ath this moment i only have the getter ans setter
methods mentioned as properties in the mapping files..

Again a lot of questions ;-)

Greetings,
Marco



On Tue, 16 Apr 2002 Gavin_King/Cirrus%CI...@ci... wrote:

>
>
> Hi Marco. Try the following:
>
> <hibernate-mapping>
>   <class name="com.mticket.Client" table="Client">
>     <id name="clientId" type="long">
>       <generator class="cirrus.hibernate.id.HiLoGenerator"/>
>     </id>
>     <property name="name"/>
>
>     <set role="besteld" readonly="true">
>         <key column="clientId"/>
>         <one-to-many class="com.mticket.Order"/>
>     </set>
>   </class>
>
>   <class name="com.mticket.Order" table="order">
>     <id name="orderid" type="long">
>       <generator class="cirrus.hibernate.id.HiLoGenerator"/>
>     </id>
>     <property name="description"/>
>     <many-to-one name="Client" column="clientId" class
> ="com.mticket.Client"/>
>   </class>
> </hibernate-mapping>
>
>
> For a bidirectional association, one (many-valued) end must be marked
> read-only, telling hibernate to use the other end for updating persistent
> state. Also the key column of the many-valued end must match the column of
> the single-valued end. Hope that makes sense....
>
> peace
>
> Gavin
>