I have an issue with NHibernate giving me the following error:
System.NotSupportedException: Attempting to parse a null value into an
sql string (column:activity0_.Type).
at NHibernate.SqlCommand.InFragment.ToFragmentString() in
InFragment.cs: line 109
at
NHibernate.Persister.Entity.SingleTableEntityPersister.DiscriminatorFilterFragment
(String alias) in SingleTableEntityPersister.cs: line 551
I set up a simple solution to reproduce the error. I have the
following domain classes:
public interface IActivity
{
Guid Id { get; set; }
}
public class Activity : IActivity
{
public DateTime StartTime { get; set; }
public Guid Id { get; set; }
}
public class Running : Activity
{
public string Where { get; set; }
}
public class Talking : Activity
{
public string ToWhom { get; set; }
}
And the following mapping xml:
<?xml version="1.0" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHibernateTesting"
namespace="NHibernateTesting" >
<class name="IActivity"
lazy="false"
table="Activity"
discriminator-value="0"
abstract="true">
<id name="Id">
<generator class="guid" />
</id>
<discriminator column="Type" type="Int16" />
<subclass name="Activity"
discriminator-value="1"
abstract="true"
lazy="false">
<property name="StartTime" />
</subclass>
<subclass name="Running"
discriminator-value="2"
lazy="false"
extends="Activity">
<property name="Where" />
</subclass>
<subclass name="Talking"
discriminator-value="3"
lazy="false"
extends="Activity">
<property name="ToWhom" />
</subclass>
</class>
</hibernate-mapping>
Any idea what I am doing wrong?
Thanks!
Michael Hedgpeth
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