Uh?
What performance problem are you worried about exactly?
Diego
On Sun, Jul 11, 2010 at 22:50, Vekaz Turković <[email protected]> wrote:
> Thank you Diego, I was afraid this will end up unanswered :) That was one
> way I considered doing it, but there's also Activities who are,
> relationship-wise, the same as notes. Both Notes and Activities will most
> probably hold a lot of data. I am afraid that, with so many relationships,
> performance might become an issue pretty soon. Would it be possible to use a
> denormalized database; Note would hold type and id of the entity it is
> attached to?
>
> On Sun, Jul 11, 2010 at 11:43 PM, Diego Mijelshon
> <[email protected]>wrote:
>
>> This was discussed last month (
>> http://groups.google.com/group/nhusers/browse_thread/thread/973df7dce9c5e0dc/97d49dac7dc21f85?lnk=gst&q=notes#97d49dac7dc21f85)
>> and it is certainly on topic :-)
>>
>> In short: the model is simple. Several classes have a collection of notes
>> (or, more precisely, a List, because the order probably matters). You could
>> create an interface (IHaveNotes) to deal with this in your code and make it
>> easy to add/retrieve notes from any entity.
>>
>> Then, you have at least two possible ways to map this:
>> - Note is a component type, there is one table per Notes collection
>> - Note is an entity, there is one table for the Notes and a many-to-many
>> table per each collection, mapped with cascade="all-delete-orphan"
>>
>> Note that the data implementation should NOT change your model. It's
>> always an IList<Note>.
>>
>> Diego
>>
>>
>>
>> On Sun, Jul 11, 2010 at 08:01, moohzor <[email protected]> wrote:
>>
>>> Hi,
>>>
>>> This isn't strictly nhibernate related, but I thought this would still
>>> be the right place to ask.
>>>
>>> I have a Note entity, related to almost all other entities (you can
>>> attach a note to pretty much anything else). All these entities have a
>>> property to hold a collection of notes (but notes don't have to have
>>> reference to the entity they're related to). I don't know how to best
>>> model this in the database and map in hbm. How would you do this?
>>>
>>> Thanks in advance.
>>>
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>
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