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Why use <many-to-one> for having <one-to-one> foreign key relationship?

 
Mustafa Garhi
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Posts: 111
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Hey ranchers,

If i need to have one-to-one unidirectional foreign key based relation between a Mouth and a Tongue i have to have this is in my Mouth.hbm.xml :

<many-to-one name="tongue"
column="tongueid"
unique="true"
/>


Why is <one-to-one> tag itself not powerful enough for this work?

Do we have a tutorial that teaches what exactly each such tag (e.g. <one-to-one>) is supposed to do and what it is not?

Thanks buddies.
 
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