Hi There,
I have a question about one-to-one formula.
Let's say I have domain object and container (org uint) object. Domain
has list of containers, but only one is rootContainer. So domain to
rootContainer is one-to-one mapping base on container.parent is null. So
I'm using one-to-one with formula for this purpose.
<class name="Domain" ...>
<id name"id" type="long">
<generator class="native"/>
</id>
<one-to-one name="rootContainer" class="Container"
property-ref="rootContainer">
<formula>id</formula>
<formula>null</formula>
</one-to-one>
</class>
<class name="Container" ...>
<id name"id" type="long">
<generator class="native"/>
</id>
<propperties name"rootContainer" >
<many-to-one name="domain" class="Domain">
<column name="domainid"/>
</many-to-one>
<many-to-one name="parent" class="Container">
<column name="parentid"/>
</many-to-one>
</properties>
<set name="children" inverse="true">
<key column="parentid"/>
<one-to-many class="Container" />
</set>
</class>
I know it doesn't work, my question is: for two formulas, how can I set
domain object for first formula parameter? How can I set null object
reference as second formula parameter instead of "null" string?
Any hint will be highly appreciated.
Thanks
Wei
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