NHibernate: Lazy loading of IUserType

问题

Say we have a system that stores details of clients, and a system that stores details of employees (hypothetical situation!). When the EmployeeSystem access an Employee, the Client information is accessed from the ClientSystem using WCF, implemented in an IUserType:

NHibernate mapping:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
    assembly="EmployeeSystem" namespace="EmployeeSystem.Entities">
   <class name="Employee" table="`Employee`"  >
      <id name="Id" column="`Id`" type="long">
         <generator class="native" />
      </id>
      <property name="Name"/>
      <property 
         name="Client" column="`ClientId`"
         lazy="true"
         type="EmployeeSystem.UserTypes.ClientUserType, EmployeeSystem" /> 
   </class>
</hibernate-mapping>

IUserType implementation:

public class ClientUserType : IUserType
{
    ...

    public object NullSafeGet(IDataReader rs, string[] names, object owner)
    {
        object obj = NHibernateUtil.Int32.NullSafeGet(rs, names[0]);

        IClientService clientService = new ClientServiceClient();
        ClientDto clientDto = null;

        if (null != obj)
        {
            clientDto = clientService.GetClientById(Convert.ToInt64(obj));
        }

        Client client = new Client
        {
            Id = clientDto.Id,
            Name = clientDto.Name
        };

        return client;
    }

    ...

}

Even though I have lazy="true" on the property, it loads the Client as soon as the Employee is loaded. Is this correct behaviour? Do I have to implement the lazy loading myself in NullSafeGet or am I missing something?

回答1:

Is it a one-to-one relation. As hibernate documentation suggests that this is all possible, there even appears to be options in the xml configuration file to switch on lazy loading for one-to-one relationships, but they have apparently no effect.

one-to-one lazy association

来源：https://stackoverflow.com/questions/7286132/nhibernate-lazy-loading-of-iusertype

标签

hibernate

nhibernate

lazy-loading