[英]NHibernate Child items query using Parent Id
So I have a set up similar to this questions: Parent Child Setup 因此,我有一个类似于以下问题的设置 : 父子设置
Everything works great when saving the parent and the children. 拯救父母和孩子,一切都很好。
However, I seem to have a problem when selecting the children. 但是,选择孩子时我似乎有问题。 I can't seem to get all the children with a specific parent.
我似乎无法让所有孩子都有一个特定的父母。
This fails with: NHibernate.QueryException: could not resolve property: ParentEntity_id of: Test.Data.ChildEntity 失败的原因是:NHibernate.QueryException:无法解析属性:Test.Data.ChildEntity的ParentEntity_id
Here is my code: 这是我的代码:
public IEnumerable<ChildEntity> GetByParent(ParentEntity parent)
{
using (ISession session = OrmHelper.OpenSession())
{
return session.CreateCriteria<ChildEntity>().Add(Restrictions.Eq("ParentEntity_id ", parent.Id)).List<ChildEntity>();
}
}
Any help in building a proper function to get all the items would be appreciated. 任何帮助构建适当功能以获取所有项目的帮助将不胜感激。
Oh, I am using Fluent NHibernate to construct the mappings - version 1 RTM and NHibernate 2.1.2 GA 哦,我正在使用Fluent NHibernate来构建映射-版本1 RTM和NHibernate 2.1.2 GA
If you need more information, let me know. 如果您需要更多信息,请告诉我。
As per you request, my fluent mappings: 根据您的要求,我的流利的映射:
public ParentEntityMap()
{
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.Code).UniqueKey("ukCode");
HasMany(x => x.ChildEntity).LazyLoad()
.Inverse().Cascade.SaveUpdate();
}
public ChildEntityMap()
{
Id(x => x.Id);
Map(x => x.Amount);
Map(x => x.LogTime);
References(x => x.ParentEntity);
}
That maps to the following 2 tables: 映射到以下两个表:
CREATE TABLE "ParentEntity" (
Id integer,
Name TEXT,
Code TEXT,
primary key (Id),
unique (Code)
)
CREATE TABLE "ChildEntity" (
Id integer,
Amount NUMERIC,
LogTime DATETIME,
ParentEntity_id INTEGER,
primary key (Id)
)
The data store in SQLite. 数据存储在SQLite中。
return session.CreateCriteria<ChildEntity>()
.Add(Restrictions.Eq("ParentEntity", parent))
.List<ChildEntity>();
Just use the parent itself. 只需使用父项本身即可。
In your criteria you should never refer to the column name but to the property name. 在您的条件中,您不应引用列名称,而应引用属性名称。 Change "ParentEntity_id" to "ParentEntity.Id " and that should solve it.
将“ ParentEntity_id”更改为“ ParentEntity.Id”,这应该可以解决。
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