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Hibernate version:
3


Im using The 3.1 alpha 5 release of the Hibernate Tools for Eclipse, and found that in java code generation (POJO) files it creates a new class for the coposite ids. Is this the best way to do this? Why not just create one POJO with the ids in the same class?

Thanks still learning!

eh - what?

So in the tools if you have a table that has a composite key say column a b with more columns c d e f....


It creates the mapping in the following way..

<class name="tableclass" table="alphabet" >
<composite-id name="id" class="alphabetId">
<key-property name="a" type="string"/>

</key-property>
<key-property name="b" type="string">

</key-property>
</composite-id>
<property name="c" type="string">
<property name="d" type="string">
<property name="e" type="string">
</class>

Thus two classes... why not leave the coposite id in the same class?
ie

<composite-id >
<key-property name="a" type="string"/>

</key-property>
<key-property name="b" type="string">

</key-property>
</composite-id>

Matter of taste and because having it as a separate class is much much easier generation wise ;)

Is there any reason for hibernate to have it that way? Perfomance etc?

no - its just one way to do it (I don't like it, but that doesnt mean it isn't good for others)