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grennis
 Post subject: Whats the difference between <array> and <list>
PostPosted: Tue Jan 16, 2007 4:20 pm 
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???
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devonl
 Post subject:
PostPosted: Tue Jan 16, 2007 7:19 pm 
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With regard to .NET they are the same type of collection:

Quote:
An array has a primary key consisting of the key columns + index column
A list has a primary key consisting of the key columns + index column


An Array actually implements List which implements Collection which actually instantiates an ArrayList. Within the mapping files however there are considerable differences in mapping params. Check nhibernate-mapping-2.0.xsd for reference.

hth,

-devon
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devonl
 Post subject:
PostPosted: Tue Jan 16, 2007 8:01 pm 
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Sorry, This relates to NH 1.0.2.0. I am pretty sure this is similar in NH 1.2.0 but I have not checked the source.

-devon


Last edited by devonl on Tue Jan 16, 2007 8:15 pm, edited 1 time in total.

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grennis
 Post subject:
PostPosted: Tue Jan 16, 2007 8:13 pm 
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I can check the XSD but it would be nice if there was more documentation on the collections and their typical uses.
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devonl
 Post subject:
PostPosted: Tue Jan 16, 2007 8:15 pm 
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heh-heh. I agree and sorry if my post seemed to leave you wanting. I can tell you that the Hibernate in Action book has helped me understand when to use certain colleciton types. Additionally the Hibernate documentation sometimes offers insights. Do you have a specifci quesiton in mind? I might be able to give you my .02.

-devon
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grennis
 Post subject:
PostPosted: Tue Jan 16, 2007 9:31 pm 
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Hmm, well I checked the XSD and it looks like they are identical except that the list supports the standard set of collection attributes whereas the array has a smaller set of possible attributes. For example, "inverse" is not an attribute of array. Not sure what's up with that. I have never seen anyone using array and I'm not sure why anyone would.
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devonl
 Post subject:
PostPosted: Tue Jan 16, 2007 11:38 pm 
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I would agree with that. I don't use arrays myself and I suspect it is there to round out the support for all collection types. In fact, from the doco:

Quote:
Lists, maps, idbags and sets are the most efficient collections to update

and:

Quote:
Bags and lists are the most efficient inverse collections

I primarily use bags and lists myself.

-d
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