Map a collection

I have two tables:

Table_A (Id1 PK, Id2)

Table_B (Id1 PK, Id2 PK, Id3 PK)

Goal:

Map to NHibernate set of rows from table_b as a collection in table_a object

<set name="Table_B_elements" table="Table_B" lazy="true">
                <key columns="Id1"/>
                <one开发者_如何学C-to-many class="Handler"/>
</set>

I can easily make a query like

select *
from Table_A as a
join Table_B as b on b.Id1 = a.Id2;

Any suggestions how to map it?

Yeah. Read http://nhibernate.info/doc/nh/en/index.html#mapping-declaration-join or here http://nhibernate.info/doc/nh/en/index.html#collections-mapping depending on what you really want to select. These are absolute basics for nHibernate. I would suggest first reading docs, then asking.