NHibernate SetFetchMode 不适用于嵌套条件

Question

假设我运行以下代码：

var placementCriteria = DetachedCriteria.For<ResidentialPlacementClientService>();
placementCriteria.Add(Restrictions.Le("StartDate", effectiveDate));
placementCriteria.Add(Restrictions.Ge("EndDate", effectiveDate));
placementCriteria.SetFetchMode("CaseClient.CaseFile", FetchMode.Eager);
placementCriteria.SetFetchMode("CaseClient.Incomes", FetchMode.Eager); 
placementCriteria.SetFetchMode("CaseClient.ClientProfile", FetchMode.Eager);
placementCriteria.SetFetchMode("CaseClient.ClientProfile.Person", FetchMode.Eager);
placementCriteria.SetFetchMode("VendorService", FetchMode.Eager);
placementCriteria.SetFetchMode("VendorService.Vendor", FetchMode.Eager);

using (var session = OpenSession())
{
    using (var tx = session.BeginTransaction())
    {
        residentialPlacements = placementCriteria.GetExecutableCriteria(session).List<ResidentialPlacementClientService>();
    }
}

我的“收入”属性已正确填充。

现在，当我添加收入标准时，不再急切地获取该房产。

var placementCriteria = DetachedCriteria.For<ResidentialPlacementClientService>();
placementCriteria.Add(Restrictions.Le("StartDate", effectiveDate));
placementCriteria.Add(Restrictions.Ge("EndDate", effectiveDate));
placementCriteria.SetFetchMode("CaseClient.CaseFile", FetchMode.Eager);
placementCriteria.SetFetchMode("CaseClient.Incomes", FetchMode.Eager); 
placementCriteria.SetFetchMode("CaseClient.ClientProfile", FetchMode.Eager);
placementCriteria.SetFetchMode("CaseClient.ClientProfile.Person", FetchMode.Eager);
placementCriteria.SetFetchMode("VendorService", FetchMode.Eager);
placementCriteria.SetFetchMode("VendorService.Vendor", FetchMode.Eager);


var caseClientCriteria = placementCriteria.CreateCriteria("CaseClient", JoinType.InnerJoin);

var incomesCriteria = caseClientCriteria.CreateCriteria("Incomes", JoinType.InnerJoin);
incomesCriteria.Add(Restrictions.Le("StartDate", effectiveDate));

incomesCriteria.Add(Restrictions.Or(Restrictions.Ge("EndDate", effectiveDate),
                                    Restrictions.IsNull("EndDate")));

incomesCriteria.Add(Restrictions.Eq("IncomeType", incomeType));

using (var session = OpenSession())
{
    using (var tx = session.BeginTransaction())
    {
        residentialPlacements = placementCriteria.GetExecutableCriteria(session).List<ResidentialPlacementClientService>();
    }
}

NHibernate 为什么要这样做？如何更改我的查询/条件以便快速获取该属性？

谢谢。

Answer 1

如果您对关联有过滤器，则 NH 无法确保返回关联的所有实体以初始化关联集合。您可以为 id 发出 Select，然后急切地获取具有关联的实体

...
placementCriteria.SetProjection(Projections.Id());

residentialPlacements = session.CreateCriteria<ResidentialPlacementClientService>()
    .Add(Subqueries.In("Id", placementCriteria))
    .SetFetchMode("CaseClient.CaseFile", FetchMode.Eager);
    .SetFetchMode("CaseClient.Incomes", FetchMode.Eager); 
    .SetFetchMode("CaseClient.ClientProfile", FetchMode.Eager);
    .SetFetchMode("CaseClient.ClientProfile.Person", FetchMode.Eager);
    .SetFetchMode("VendorService", FetchMode.Eager);
    .SetFetchMode("VendorService.Vendor", FetchMode.Eager);
    .List<ResidentialPlacementClientService>();