NHibernate mapping class

Question

I am new in NHibernate and need help. I have two classes:

class Pop3 { public virtual long Id { set; get; } public virtual string HostName { set; get; } public virtual int Port { set; get; } public virtual bool UseSsl { set; get; } } class Email { public virtual long Id { set; get; } public virtual string UserName { set; get; } public virtual string Password { set; get; } public virtual Pop3 Host { set; get; } }

I need to map them to NHibernate (uses Sqlite). That is easy with Pop3 class

<?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="TestAsm" namespace="TestAsm.Entity.Mail"> <class name="Pop3" table="pop3hosts"> <id name="Id"> <generator class="identity" /> </id> <property name="HostName" /> <property name="Port" /> <property name="UseSsl" /> </class> </hibernate-mapping>

But how can I map Email class contains Pop3 class as property? My be i need to set Pop3.Id in Host property? But I think it is wrong way.

Radim Köhler · Accepted Answer · 2014-03-12 11:00:50Z

This mapping belongs to the most basic, typical and well documented, I would say

An example, where the Pop3 class is mapped with many-to-one over the column Pop3Id:

<?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="TestAsm" namespace="TestAsm.Entity.Mail"> <class name="Email" table="email_table"> <id name="Id" generator="identity" /> <property name="UserName" /> <property name="Password" /> <many-to-one name="Host" column="Pop3Id" class="Pop3 " /> </class> </hibernate-mapping>

Please check the Chapter 21. Example: Parent/Child

Do I need to set namespace in class attribute if class is in different name space like class="TestAsm.Net.Pop3"?
Great if that helped ;) namespace attribute on the class element is an abbrev, so if all referenced entities (many-to-one) are in the same ns ... no need to declare it again. but if class is in different, we have to provide its name with namespace. Enjoy NHibernate

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