In XML it would like this:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHibernate.Test"
namespace="NHibernate.Test.NHSpecificTest.NH1234"
default-access="property" auto-import="true"
default-
cascade="none" default-lazy="false">
<class xmlns="urn:nhibernate-mapping-2.2" discriminator-value="255"
name="ParentClass" table="Hierarchy">
<id name="Id" type="Guid">
<column name="Id" />
<generator class="guid.comb" />
</id>
<discriminator type="Byte" >
<column name="TypeDiscriminator"
unique-key="UQ_Type_Name" not-
null="true"/>
</discriminator>
<property name="Name" type="String">
<column name="Name" unique-key="UQ_Type_Name"/>
</property>
<subclass name="DerivedClass" discriminator-value="0">
<property name="ChildProperty" type="String">
<column name="ChildProperty"/>
</property>
</subclass>
</class>
</hibernate-mapping>
Please note discriminator element with column element specifying
unique-key.
For this model:
namespace NHibernate.Test.NHSpecificTest.NH1234
{
public class ParentClass
{
public Guid Id { get; set; }
public string Name { get; set; }
}
public class DerivedClass : ParentClass
{
public string ChildProperty { get; set; }
}
}
And it gives this schema:
create table Hierarchy (
Id UNIQUEIDENTIFIER not null,
TypeDiscriminator TINYINT not null,
Name NVARCHAR(255) null,
ChildProperty NVARCHAR(255) null,
primary key (Id),
unique (TypeDiscriminator, Name)
)
Basically, I would like to have something unique within each type.
On 27 Sie, 11:59, James Gregory <[email protected]> wrote:
> Where are you trying to specify this unique key? How would you do it with
> xml?
>
> UniqueKey("discriminatorcolumn,anothercolumn")
>
> On Wed, Aug 26, 2009 at 6:00 PM, Artur Dorochowicz <
>
> [email protected]> wrote:
>
> > Hello,
>
> > I have this requirement to include a discriminator column in a unique
> > key. From NH mapping schema, I see that that can be done.
>
> > I know that FNH does not support such construct in its fluent
> > interface, but I was wondering, maybe there is some extension point or
> > a way to add attribute or literal xml to specify that. I couldn't find
> > any so I'm asking here for help.
>
> > I'm using manual mappings, so it's not automapping related.
>
> > Thanks
>
> > Artur
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