Even assuming I can use a different generator such as hilo or
guid.comb the following mapping still fails due to the foreign key and
an incorrect insert order, essentially on Bar's one-to-one I need
something like inverse="true".
I did manage to get something working using <join><component>...</
component></join> but it just seems messy.
<class name="ValueMapping.Foo, ValueMapping" table="Foo">
<id name="Id" type="int">
<generator class="hilo" />
</id>
<one-to-one cascade="all" class="ValueMapping.Bar,
ValueMapping" constrained="true" foreign-key="none" name="Bar" />
<property name="Name" type="string"/>
</class>
<class name="ValueMapping.Bar, ValueMapping" table="Bar">
<id name="Id">
<generator class="foreign">
<param name="property">Foo</param>
</generator>
</id>
<one-to-one name="Foo" constrained="true" foreign-
key="FK_BarToFoo"/>
<property name="Rate"/>
<property name="Value"/>
</class>
On 25 Jan, 15:45, Chris C <[email protected]> wrote:
> I've tidied up the mapping file and switched to using the foreign key
> generator but the basic problem you described still remains.
> NHibernate keeps insisting upon trying to save B before A, when
> instead it needs to save A then B.
>
> The database in question is an older legacy schema which cannot be
> changed at this current point in time unfortunately.
>
> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
> <class xmlns="urn:nhibernate-mapping-2.2" name="ValueMapping.Foo,
> ValueMapping" table="Foo">
> <id name="Id" type="int">
> <generator class="identity" />
> </id>
> <one-to-one cascade="all" class="ValueMapping.Bar,
> ValueMapping" constrained="true" foreign-key="none" name="Bar" />
> <property name="Name" type="string"/>
> </class>
>
> <class xmlns="urn:nhibernate-mapping-2.2" name="ValueMapping.Bar,
> ValueMapping" table="Bar">
> <id name="Id">
> <generator class="foreign">
> <param name="property">Foo</param>
> </generator>
> </id>
> <one-to-one name="Foo" constrained="true" foreign-
> key="FK_BarToFoo"/>
> <property name="Rate"/>
> <property name="Value"/>
> </class>
> </hibernate-mapping>
>
> On 25 Jan, 15:18, Fabio Maulo <[email protected]> wrote:
>
>
>
> > If A has a constraint where B must exist and B has a constraint where A must
> > exist and the only way to know a POID using identity is storing a record how
> > you can do it ?
>
> > In some case, in NH, you can use <inverse> to define the "owner"of the
> > relationship.
> > Advise:
> > 1) don't send a generated mapping because it is not human-readable
> > 2) don't use "native" if native=identity
> > 3) don't use composite-key if you don't need it (in your case there is only
> > one field)
> > 4) have a look to :
> > <generator class="foreign">
> > <param name="property">Foo</param>
> > </generator>
>
> > 2010/1/25 Chris C <[email protected]>
>
> > > If I have a pair of tables that have a one-to-one relation between
> > > them, how do I control the order in which they are saved (i.e. define
> > > which is the parent)?
>
> > > Currently NHibernate keeps trying to save "Bar" before it has saved
> > > "Foo" and thus either fails due to a foreign key violation when using
> > > something like "guid.comb" or null key error if using something like
> > > "native".
>
> > > The mapping I have so far is listed below, the example source is at
> > >http://gist.github.com/285899
>
> > > <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-
> > > access="property" auto-import="true" default-cascade="none" default-
> > > lazy="true">
> > > <class xmlns="urn:nhibernate-mapping-2.2" name="ValueMapping.Foo,
> > > ValueMapping, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
> > > table="`Foo`">
> > > <id name="Id" type="System.Int32, mscorlib, Version=2.0.0.0,
> > > Culture=neutral, PublicKeyToken=b77a5c561934e089">
> > > <column name="Id" />
> > > <generator class="native" />
> > > </id>
> > > <one-to-one cascade="all" class="ValueMapping.Bar, ValueMapping,
> > > Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
> > > constrained="true" foreign-key="none" name="Bar" />
> > > <property name="Name" type="System.String, mscorlib,
> > > Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
> > > <column name="Name" />
> > > </property>
> > > </class>
>
> > > <class xmlns="urn:nhibernate-mapping-2.2" name="ValueMapping.Bar,
> > > ValueMapping, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
> > > table="`Bar`">
> > > <composite-id mapped="false" unsaved-value="undefined">
> > > <key-many-to-one name="Foo" class="ValueMapping.Foo,
> > > ValueMapping, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
> > > <column name="Foo" />
> > > </key-many-to-one>
> > > </composite-id>
> > > <property name="Rate" type="System.Int32, mscorlib,
> > > Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
> > > <column name="Rate" />
> > > </property>
> > > <property name="Value" type="System.Int32, mscorlib,
> > > Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
> > > <column name="Value" />
> > > </property>
> > > </class>
> > > </hibernate-mapping>
>
> > > --
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>
> > --
> > Fabio Maulo
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