我正在尝试获取共享该类别的产品列表。
NHibernate 不返回错误的产品。
这是我的标准 API 方法:
public IList<Product> GetProductForCategory(string name)
{
return _session.CreateCriteria(typeof(Product))
.CreateCriteria("Categories")
.Add(Restrictions.Eq("Name", name))
.List<Product>();
}
这是我的 HQL 方法:
public IList<Product> GetProductForCategory(string name)
{
return _session.CreateQuery("select from Product p, p.Categories.elements c where c.Name = :name").SetString("name",name).List<Product>();
}
这两种方法在应该返回 2 个产品时都不返回任何产品。
这是 Product 类的映射:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="CBL.CoderForTraders.DomainModel" namespace="CBL.CoderForTraders.DomainModel">
<class name="Product" table="Products" >
<id name="_persistenceId" column="ProductId" type="Guid" access="field" unsaved-value="00000000-0000-0000-0000-000000000000">
<generator class="assigned" />
</id>
<version name="_persistenceVersion" column="RowVersion" access="field" type="int" unsaved-value="0" />
<property name="Name" column="ProductName" type="String" not-null="true"/>
<property name="Price" column="BasePrice" type="Decimal" not-null="true" />
<property name="IsTaxable" column="IsTaxable" type="Boolean" not-null="true" />
<property name="DefaultImage" column="DefaultImageFile" type="String"/>
<bag name="Descriptors" table="ProductDescriptors">
<key column="ProductId" foreign-key="FK_Product_Descriptors"/>
<one-to-many class="Descriptor"/>
</bag>
<bag name="Categories" table="Categories_Products" >
<key column="ProductId" foreign-key="FK_Products_Categories"/>
<many-to-many class="Category" column="CategoryId"></many-to-many>
</bag>
<bag name="Orders" generic="true" table="OrderProduct" >
<key column="ProductId" foreign-key="FK_Products_Orders"/>
<many-to-many column="OrderId" class="Order" />
</bag>
</class>
</hibernate-mapping>
最后是 Category 类的映射:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="CBL.CoderForTraders.DomainModel" namespace="CBL.CoderForTraders.DomainModel" default-access="field.camelcase-underscore" default-lazy="true">
<class name="Category" table="Categories" >
<id name="_persistenceId" column="CategoryId" type="Guid" access="field" unsaved-value="00000000-0000-0000-0000-000000000000">
<generator class="assigned" />
</id>
<version name="_persistenceVersion" column="RowVersion" access="field" type="int" unsaved-value="0" />
<property name="Name" column="Name" type="String" not-null="true"/>
<property name="IsDefault" column="IsDefault" type="Boolean" not-null="true" />
<property name="Description" column="Description" type="String" not-null="true" />
<many-to-one name="Parent" column="ParentID"></many-to-one>
<bag name="SubCategories" inverse="true">
<key column="ParentID" foreign-key="FK_Category_ParentCategory" />
<one-to-many class="Category"/>
</bag>
<bag name="Products" table="Categories_Products">
<key column="CategoryId" foreign-key="FK_Categories_Products" />
<many-to-many column="ProductId" class="Product"></many-to-many>
</bag>
</class>
</hibernate-mapping>
你能看出可能是什么问题吗?
如果我删除添加行我的查询是:
return _session.CreateCriteria(typeof(Product))
.CreateCriteria("Categories")
.List<Product>();
现在看着我的监视窗口,我返回了 5 个附加了类别的产品。我在初始查询中查找的类别名称出现在 2 个产品上。
所以当我添加行时出现问题: .Add(Restrictions.Eq("Name", name))
这是生成的 Sql,包括 Restriction 行:
NHibernate: 选择 this_.ProductId 作为 ProductId23_1_, this_.RowVersion 作为 RowVersion23_1_, this_.ProductName 作为 ProductN3_23_1_, this_.BasePrice 作为 BasePrice23_1_, this_.IsTaxable 作为 IsTaxable23_1_, this_.DefaultImageFile 作为 DefaultI6_23_1_, categories3_.ProductId 作为 ProductId, category1_.CategoryId 作为, category1_.CategoryId as CategoryId16_0_, category1_.RowVersion as RowVersion16_0_, category1_.Name as Name16_0_, category1_.IsDefault as IsDefault16_0_, category1_.Description as Descript5_16_0_, category1_.ParentID as ParentID16_0_ FROM Products this_inner join Categories_Products categories3_ on this_.ProductId=categories3_。 ProductId 内连接 Categories category1_ on categories3_.CategoryId=category1_.CategoryId WHERE category1_.Name = @p0; @p0 = '动量'