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    <p>I will show you how I did this</p> <pre><code>&lt;class name="CompanyCharacteristic" table="firma_cecha" abstract="true" discriminator-value="not null"&gt; &lt;id name="Id" column="id_firma_cecha"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;discriminator column="typ_cechy"/&gt; &lt;property name="FriendlyTypeName" column="typ_cechy" insert="false" update="false"/&gt; &lt;property name="All" column="cecha_all" access="nosetter.camelcase"/&gt; &lt;!-- Auditing data --&gt; &lt;property name="UserInserted" access="nosetter.camelcase" column="user_insert" insert="true" update="false"/&gt; &lt;property name="DateInserted" column="data_insert" generated="insert" insert="false" update="false"/&gt; &lt;subclass discriminator-value="Akceptacja kart płatniczych" name="CreditCardAcceptanceCharacteristic"&gt; &lt;property name="DoesIt" column="cecha_dec_1" not-null="true" type="DataAccess.NHibernate.Infrastructure.UserTypes.EnumValueInfoUserType`1[[Domain.Characteristics.YesNoNumericEnum, Domain]], DataAccess"/&gt; &lt;sql-insert&gt; DECLARE @returned decimal(20,0) exec sp_FirmaCecha_Add @TypCechy = 'Akceptacja kart płatniczych', @CechaAll = ?, @UserInsertZrodlo = ?, @CechaDec1 = ?, @IdFirmaCecha = @returned OUTPUT SELECT @returned &lt;/sql-insert&gt; &lt;sql-update&gt; exec sp_FirmaCecha_Update @TypCechy = 'Akceptacja kart płatniczych', @UserUpdateZrodlo = ?, @CechaDec1 = ?, @IdFirmaCecha = ? &lt;/sql-update&gt; &lt;sql-delete&gt; exec sp_FirmaCecha_Delete ? &lt;/sql-delete&gt; &lt;/subclass&gt; &lt;sql-insert&gt; raiserror ('CompanyInfoCharacteristic nie moze byc dodwana za pomocą NHibernate',11,1) &lt;/sql-insert&gt; &lt;sql-update&gt; raiserror ('CompanyInfoCharacteristic nie moze byc aktualizowana za pomocą NHibernate.',11,1) &lt;/sql-update&gt; &lt;sql-delete&gt; raiserror ('CompanyInfoCharacteristic nie moze byc kasowana za pomocą NHibernate.',11,1) &lt;/sql-delete&gt; </code></pre> <p>As you can see every subclass need to have its own sql statements. Base class can have its own statements also. In this example I do not allow to modify Base class instances through NHibernate</p>
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    1. COThanks for your response. So I'm getting the sense that I will need to create two different stored procedures for object B and C, and if the number of properties are different in B and C, then the number of parameters passed to the stored procedure will be different as well?
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