Hello everyone,

I'm attempting to get NHibernate integrated into an existing product that has LOTS of tiny classes that need to be persisted to a data layer. Our implementation needs to be database independent as well. I've been trying to get net2hbm and hbm2ddl working, without success even for the simplest of examples. The errors are all being reported under hbm2ddl. I was wondering if I could get some feedback on what is going on.

Hibernate version: NHibernate 1.0.4

Mapping documents:
<?xml version="1.0" encoding="utf-8"?>
<!--Generated from NHibernate.Mapping.Attributes on 2007-02-06 12:00:54Z.-->
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="NHibernateEval.Person, NHibernateEval">
<id>
<generator class="native" />
</id>
<property name="FirstName" not-null="true "/>
<property name="LastName" not-null="true "/>
<property name="Birthday" not-null="true "/>
<property name="MetricHeight" not-null="true" />
<property name="MetricWeight" not-null="true" />
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():
public void GenerateSqlSchema(string _outputFilename) {
ISessionFactory factory = null;

foreach (string filename in AssemblyFilenames)
{
Assembly asm = Assembly.LoadFrom(filename);
Console.WriteLine("Attempting to load Assembly {0}", filename);
using(Stream s = new MemoryStream())
{
HbmSerializer.Default.Serialize(s, asm);
s.Position = 0;
m_Configuration.AddInputStream(s);
}
}
factory = m_Configuration.BuildSessionFactory();

SchemaExport se = new SchemaExport(m_Configuration);
se.SetOutputFile(_outputFilename);
se.Create(false, false);
}

Full stack trace of any exception that occurs:
Unhandled Exception: NHibernate.MappingException: must specify an identifier type: Person
at NHibernate.Cfg.Binder.BindRootClass(XmlNode node, RootClass model, Mappings mappings)
at NHibernate.Cfg.Binder.BindRoot(XmlDocument doc, Mappings model)
at NHibernate.Cfg.Configuration.AddValidatedDocument(XmlDocument doc)
at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream)

Name and version of the database you are using:
SqlServer 2000

The generated SQL (show_sql=true):
none. exception thrown first :(

Debug level Hibernate log excerpt:
NONE

you would have to specify at least the name of the ID column.

Job Samuel

Well, the Name="" in my NHMA decorator for the Id property was needed, but also a Type="Int64" really made the error go away.

Thanks for the help!