NHibernate一对多查询

Question

I got a Client entity related to n network domain accounts.

Client:
IList<DomainInfo> domainInfo;

DomainInfo:
string domain;
string username;

The mapping of Client.hbm.xml contains:

<bag name="domainInfo" cascade="all" lazy="false">
  <key column="client"/>
  <one-to-many class="Kardex.CMS.Domain.Model.Client.DomainInfo"/>
</bag>

The mappinf of DomainInfo.hbm.xml does NOT contain a many-to-one mapping to Client.

When I insert Client entities with domain info elements into the database, everything works fine. Each domain info entry contains the "client"-column mapped to the right client.

Now I want to query the user with a certain network domain and username:

clients = session.CreateQuery("from Client c where c.domainInfo.username = :winuser and c.domainInfo.domain = :windomain")
    .SetParameter("winuser", "john_doe")
    .SetParameter("windomain", "domain123")
    .List<Client>();

But I get an exception:

illegal attempt to dereference collection [client0_.id.domainInfo] with element 
property reference [username]

I also tried an INNER JOIN, but then I get another exception:

from Client c inner join c.domainInfo d where d.username = :winuser and d.domain = :windomain

throws

Could not execute query[SQL: SQL not available]

This should be a simple task I guess? What could be wrong here?

Thank you in advance!

Answer 1

修复：

select c from Client c left join c.domainInfo d where d.username = :winuser and d.domain = :windomain