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NHibernate One-To-One
class A {
public virtual string Id {get;set;}
public virtual B B {get;set;} // properties...... }

class B { public virtual string Id {get;set;} // properties......
public virtual string ParentId { get;set;} // class A Id }

CREATE TABLE [A](
    [Id] [nvarchar](45) PRIMARY KEY
) ON [PRIMARY]

CREATE TABLE [B](
    [Id] [nvarchar](45) PRIMARY KEY,
    [ParentId] [nvarchar](45) NOT NULL
) ON [PRIMARY]

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="A,AssemblyName" table="A" lazy="true">
<id name="Id" column="Id" type="string">
<generator class="assigned"/>
</id>
<one-to-one name="_B" cascade="all" fetch="join" foreign-key="None" constrained="true" class="B"/>
</class>
</hibernate-mapping>


<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="B,AssemblyName" table="B" lazy="true">
<id name="Id" column="Id" type="string"> <generator class="assigned"/> </id>
<property name="_Name" column="Name"/> </class>
</hibernate-mapping>

<class name="B,AssemblyName" table="B" lazy="true">
   <id name="Id" column="Id" type="string">
      <generator class="assigned"/>
   </id>
   <many-to-one name="A" unique="true" column="A" />
   <property name="_Name" column="Name"/>
</class>