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FLUENT NHiBiNATE:一对多映射到抽象类中存在外键的子类

nhibernate-mapping fluent-nhibernate
  •  1
  • John Allers  · 技术社区  · 14 年前

    我试图映射的数据库结构大致类似于: 

    Forms
----
FormId
CompletedBy

Records
-------
RecordId
RecordTypeId
FormId

EducationRecords
----------------
RecordId
SchoolName
DateAttendedFrom
DateAttendedTo

    我的实体: 

    public class Form
{
    public virtual int Id { get; private set; }
    public virtual string CompletedBy { get; set; }

    public virtual IList<Entities.EducationRecord> EducationRecords { get; set; }

    public Form()
    {
        this.EducationRecords = new List<EducationRecord>();
    }
}

public abstract class Record
{
    public virtual int Id { get; set; }
    public virtual int RecordTypeId { get; set; }
    public virtual Form Parent { get; set; }
}

public class EducationRecord : Record
{
    public virtual string SchoolName { get; set; }
    public virtual DateTime DateAttendedFrom { get; set; }
    public virtual DateTime DateAttendedTo { get; set; }
}

    我的映射: 

    public class FormMap : ClassMap<Entities.Form>
{
    public FormMap()
    {
        Table("Forms");
        Id(x => x.Id, "FormId");
        Map(x => x.CompletedBy);

        HasMany(x => x.EducationRecords);
    }
}

public class RecordMap : ClassMap<Entities.Record>
{
    public RecordMap()
    {

        Table("Records");
        Id(x => x.Id, "RecordId");
        Map(x => x.RecordTypeId);
        References(x => x.Parent, "FormId");
    }
}

public class EducationRecordMap : SubclassMap<Entities.EducationRecord>
{
    public EducationRecordMap()
    {
        Table("EducationRecords");
        KeyColumn("RecordId");
        Map(x => x.SchoolName);
        Map(x => x.DateAttendedFrom);
        Map(x => x.DateAttendedTo);
    }
}


    [SqlException (0x80131904): Invalid column name 'FormId'.
Invalid column name 'FormId'.]

    看起来底层SQL查询试图在EnvialRealStand表上查询“FuffID”列,但该列不存在。我花了很多时间用我的map类尝试不同的配置变体,但没有成功。

    所以我的问题是:在检索教育记录时,如何告诉Fluent NHibernate使用记录表中的“FormId”列,或者这甚至是可能的?


    我的问题似乎与这里所说的基本相同(不幸的是,这个问题一直没有得到解决):
    Fluent NHibernate inheritance mapping problem

    更新2:

    按照建议,我对FormMap做了以下更改: 

    HasMany(x => x.EducationRecords).Inverse();

    以下是源错误: 

    Line 14: 
Line 15:     <div>
Line 16:         <% if (Model.EducationRecords.Any()) { %>
Line 17: 
Line 18:             <table>

    模型的类型为Form。 

    [SqlException (0x80131904): Invalid column name 'FormId'.
Invalid column name 'FormId'.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +2030802
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +5009584
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +234
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2275
   System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +33
   System.Data.SqlClient.SqlDataReader.get_MetaData() +86
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +311
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +987
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +141
   System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +12
   System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader() +12
   NHibernate.AdoNet.AbstractBatcher.ExecuteReader(IDbCommand cmd) +278
   NHibernate.Loader.Loader.GetResultSet(IDbCommand st, Boolean autoDiscoverTypes, Boolean callable, RowSelection selection, ISessionImplementor session) +264
   NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies) +186
   NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies) +70
   NHibernate.Loader.Loader.LoadCollection(ISessionImplementor session, Object id, IType type) +226

[GenericADOException: could not initialize a collection: [Sample.NHibernate.Entities.Form.EducationRecords#1][SQL: SELECT educationr0_.FormId as FormId1_, educationr0_.RecordId as RecordId1_, educationr0_.RecordId as RecordId1_0_, educationr0_1_.RecordTypeId as RecordTy2_1_0_, educationr0_1_.FormId as FormId1_0_, educationr0_.SchoolName as SchoolName2_0_, educationr0_.DateAttendedFrom as DateAtte3_2_0_, educationr0_.DateAttendedTo as DateAtte4_2_0_, educationr0_.Degree as Degree2_0_, educationr0_.DateDegreeAwarded as DateDegr6_2_0_ FROM dbo.EducationRecords educationr0_ inner join dbo.Records educationr0_1_ on educationr0_.RecordId=educationr0_1_.RecordId WHERE educationr0_.FormId=?]]
   NHibernate.Loader.Loader.LoadCollection(ISessionImplementor session, Object id, IType type) +345
   NHibernate.Loader.Collection.CollectionLoader.Initialize(Object id, ISessionImplementor session) +27
   NHibernate.Persister.Collection.AbstractCollectionPersister.Initialize(Object key, ISessionImplementor session) +29
   NHibernate.Event.Default.DefaultInitializeCollectionEventListener.OnInitializeCollection(InitializeCollectionEvent event) +349
   NHibernate.Impl.SessionImpl.InitializeCollection(IPersistentCollection collection, Boolean writing) +431
   NHibernate.Collection.AbstractPersistentCollection.Initialize(Boolean writing) +47
   NHibernate.Collection.Generic.PersistentGenericBag`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +16
   System.Linq.Enumerable.Any(IEnumerable`1 source) +71
   ASP.views_form_index_aspx.__RenderContent2(HtmlTextWriter __w, Control parameterContainer) in c:\Dev\Sandbox\NHibernateSample\Sample.Web\Views\Form\Index.aspx:16
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) +55
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3060

    在GenericADOException中显示的生成的SQL查询中,WHERE子句指定: 

    WHERE educationr0_.FormId=?


    WHERE educationr0_1_.FormId=?
    5 回复  |  直到 7 年前
        1
  •  1
  •   John Allers    13 年前

    我花了一段时间才重温这件事。我发布这个问题后不久就不再和流利的NHibernate玩了。

    EducationRecords 具有 Records . 如果需要,可以从中检索特定类型的记录。

    教育记录 在里面 Forms . 我怀疑这可能是因为我对ORMs缺乏经验,或者数据库设计中可能存在一个未正确表示的约束。

        2
  •  1
  •   FreeClimb    10 年前

    解决办法真的很简单。您需要为所有子类映射指定,这是一个抽象 基类 

    public class EducationRecordMap : SubclassMap<Entities.EducationRecord>
{
   public EducationRecordMap()
   {
    Table("EducationRecords");

    Abstract(); // because Record base class is abstract

    KeyColumn("RecordId");
    Map(x => x.SchoolName);
    Map(x => x.DateAttendedFrom);
    Map(x => x.DateAttendedTo);
  }
 }
        3
  •  0
  •   Variant    14 年前 

    HasMany(x => x.EducationRecords);

    到 

    HasMany(x => x.EducationRecords).Inverse();

    您可以在此处阅读有关多余更新的更多信息: http://nhprof.com/Learn/Alerts/SuperfluousManyToOneUpdate

        4
  •  0
  •   Sly    14 年前

    您应该检查得到的XML映射。可能是它生成的子类映射而不是连接的子类。 http://knol.google.com/k/fabio-maulo/nhibernate-chapter-8-inheritance-mapping/1nr4enxv3dpeq/11

        5
  •  0
  •   Serhiy    14 年前 

    public class FormMap : ClassMap<Entities.Form>
{
    public FormMap()
    {
        Table("Forms");
        Id(x => x.Id, "FormId");
        Map(x => x.CompletedBy);

        HasMany<Record>(x => x.EducationRecords).Where("form0_1_.EducationRecordId is not null");
    }
}

    使课堂记录不是抽象的。这对我有用。可能'form0_1_u'不是正确的列名。您可以在生成的SQL中找到正确的一个。

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