Hello, I do not understand why do you need to map your one-to-one through bags for "performance consideration". I have a classical one-to-one with one end nullable, with lazy-loading enabled. And it works fine, even when the nullable end is null. (Batching seems not to be implemented on one-to-one though, I see separated queries for lazy-loading on each access.)
Here is the mapping (xml, I do not known the "by code" syntax) I have for that : "master table" (responsible for the primary key) : <class name="Lot" table="LOT" mutable="false" batch-size="20"> <cache usage="read-only" /> <id name="Id" column="REF_LOT"> <generator class="identity"/> <!-- or whatever you want but not foreign --> </id> <!-- misc stuff ... --> <one-to-one name="Indicateurs" class="LotIndicateur" /> <!-- misc stuff ... --> </class> "child table" (having its primary key foreign from "master") : <class name="LotIndicateur" table="LOT_INDICATEUR" mutable="true" batch-size="20"> <id name="Id" column="REF_LOT"> <generator class="foreign"> <param name="property">Lot</param> </generator> </id> <one-to-one name="Lot" class="Lot" constrained="true" /> <!-- misc stuff ... --> </class> Le lundi 13 mai 2013 16:54:50 UTC+2, Stefan a écrit : > > I am trying to map a legacy bidirectional one-to-one with shared PK using > 2 bags. One end of the relation can be null. > > The reason i am doing this is for performance consideration (mostly to > provide lazy-loading). I have tried doing this with many-to-one but i get > all kind of strange issues plus i always need to check for an invalid proxy > due to the possibility that there is no associated record in one end of the > relation. > > > -- You received this message because you are subscribed to the Google Groups "nhusers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nhusers?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
