You want the <database-scope> mapping element; see 
http://ayende.com/blog/3947/nhibernate-mapping-database-object for an 
example of this in action.

Cheers,
-Steve B.

On Tuesday, May 29, 2012 11:35:43 AM UTC-4, nerdia wrote:
>
> Hi, 
>
> I was wondering if anyone could help me figure out how to setup a 
> constraint from the hibernate XML. 
>
> I need the combination of two columns to be unique. 
>
> So for instance, if the columns are Name and Type, Then you could have 
> the following combinations in the DB: 
>
> Name Type 
> John   Leader 
> John   Follower 
> Sam   Leader 
>
> I can add this to the DB directly with constraints: 
> ALTER TABLE [Members] ADD  CONSTRAINT [UQ_NameType] UNIQUE 
> NONCLUSTERED 
> ( 
>         [Name],[Type] ASC 
> )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY 
> = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [MAIN] 
>
> But am not clear how to set it up in the XML. 
>
> Any help would be appreciated. 
>
> Thanks, 
>
> Nadia

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