Question

鉴于以下表格，我试图使用条件查询返回给定资源的所有分配：

create table Resources (
    ResourceId  integer,
   ResourceName TEXT not null,
   BusinessId TEXT not null,
   OrganizationName TEXT not null,
   primary key (ResourceId)
)

create table Allocations (
    AllocationId  integer,
   StartTime DATETIME not null,
   EndTime DATETIME not null,
   PostingTime DATETIME,
   ResourceId INTEGER,
   ActivityBaseId INTEGER,
   primary key (AllocationId),
  unique (StartTime, EndTime, ResourceId, ActivityBaseId)
)

public Resource FetchFor(Resource resource, DateRange range) {
    var allocations = _session.CreateCriteria<Resource>()
            .CreateCriteria("Allocations")
                .Add(Restrictions.Between("EndTime", (DateTime)range.Start, (DateTime)range.End))
            .List<Allocation>();

        if (allocations.Count() > 0) 
            resource.ReplaceAllocations(allocations);

        return resource;
    }

我运行时遇到此异常：

failed: NHibernate.QueryException : could not resolve property: EndTime of: Domain.Model.Allocations.Allocation

模型已映射，我可以毫无困难地保存资源及其关联的分配，就像我正在测试此Fetch查询一样。 NHib sql的一个示例： NHibernate：INSERT INTO Allocations（StartTime，EndTime，PostingTime，ResourceId，ActivityBaseId）VALUES（@ p0，@ p1，@ p2，@ p3，@ p4）; select last_insert_rowid（）; @ p0 = 1/28/2010 12:00:00 AM，@ p1 = 1/28/2010 1:00:00 AM，@ p2 = NULL，@ p3 = 1，@ p4 = 4 < / p>

异常消息令人困惑，因为NHib清楚地了解如何映射Allocation.EndTime。请：
1）帮助解决这篇文章中的查询/清理问题，以及
2）指出任何用于学习nhib查询的最喜欢的资源，特别是如果有例子的话。

顺便说一下，我确实意识到我没有在显示的示例中使用Resource param，因为我几乎（错误？）应用了Ayende的posting上的示例中的代码。如果我可以使这个连接查询工作，我会把它变成一个子查询的性能。

谢谢！
Berryl

=== NHib Mapping =====

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property"   auto-import="true" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" name="Domain.Model.Allocations.Allocation, Domain, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="Allocations">
<id name="Id" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" unsaved-value="0">
  <column name="AllocationId" />
  <generator class="identity" />
</id>
<property name="TimeRange" type="Data.UserTypes.AllocationTimeRangeUserType, Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
  <column name="StartTime" not-null="true" unique-key="DomainSignature" />
  <column name="EndTime" not-null="true" unique-key="DomainSignature" />
</property>
<property name="PostingTime" type="System.Nullable`1[[System.DateTime, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
  <column name="PostingTime" not-null="false" />
</property>
<many-to-one class="Domain.Model.Resources.Resource, Domain, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" foreign-key="Resource_FK" name="Resource">
  <column name="ResourceId" unique-key="DomainSignature" />
</many-to-one>
<many-to-one class="Domain.Model.Activities.ActivityBase, Smack.ConstructionAdmin.Domain, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" foreign-key="ActivityBase_FK" name="Activity">
  <column name="ActivityBaseId" unique-key="DomainSignature" />
</many-to-one>

Answer 1

我一直试图复制你的问题，但没有成功。由于您没有在查询中使用资源，您是否可以尝试简化操作，例如：

var allocations = _session.CreateCriteria<Allocation>()  
            .Add(Restrictions.Between("EndTime", (DateTime)range.Start, (DateTime)range.End))
        .List<Allocation>();

我做了一些连接查询，我可以提供以下示例，我希望这有帮助：

        public IList<ItemOrder> GetItemOrderByCriteria(int? itemNumber, int? warehouseNumber, DateTime? orderPickDate, string orderStoreNum, string statusCode)
    {
        try
        {
            NHibernate.ICriteria criteria = NHibernateSession.CreateCriteria(typeof(Core.SuggestedOrders.ItemOrder));

            if (itemNumber.HasValue)
                criteria.CreateCriteria("Item", "Item").Add(Expression.Eq("Item.ItemNumber", itemNumber.Value));

            if (warehouseNumber.HasValue)
                criteria.CreateCriteria("Warehouse", "Warehouse").Add(Expression.Eq("Warehouse.WarehouseNumber", warehouseNumber));

            if (!String.IsNullOrEmpty(orderStoreNum))
                criteria.Add(Expression.Eq("OrdStoreNum", orderStoreNum));

            if (!String.IsNullOrEmpty(statusCode))
                criteria.Add(Expression.Eq("StatusCode", statusCode));

            if (orderPickDate.HasValue)
            {
                DateTime minPickDate = new DateTime(orderPickDate.Value.Year, orderPickDate.Value.Month, orderPickDate.Value.Day, 0,0,0);
                DateTime maxPickDate = new DateTime(orderPickDate.Value.Year, orderPickDate.Value.Month, orderPickDate.Value.Day, 23,59,59);

                criteria.Add(Expression.Between("OrdPickDate", minPickDate, maxPickDate));
            }

            return criteria.List<Core.SuggestedOrders.ItemOrder>();
        }
        catch (NHibernate.HibernateException he)
        {
            DataAccessException dae = new DataAccessException("NHibernate Exception", he);
            throw dae;
        }

    }

Answer 2

好像你没有Allocation的映射属性叫做EndTime所以你得到这个错误并不奇怪。 EndTime列通过自定义类型TimeRange进行映射，因此您可以在此查询。

Allocation.cs示例和客户TimeRange可能也有助于理解问题。

NHibernate标准查询帮助

2 个答案: