Map does not cascade inserted objects

reflection · **Joined:** Wed Feb 11, 2009 10:58 am **Posts:** 55

Hello,

I've got a small problem with a map and cascade.

My Objects + mappings:

Testspecification:

Code:

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="ETToolV2" namespace="Continental.ETTool"> 
  <class name="Testspecification" table="ET_TESTSPECIFICATION" lazy="true"> 
    <id name="Id" column="ID_TESTSPECIFICATION" type="Decimal"> 
      <generator class="sequence"> 
        <param name="sequence">ET_TESTSPECIFICATION_SEQ</param> 
      </generator> 
    </id> 
    <map name="VirtualIncarnations" table="ET_VIRTUALTESTSTEPDATA" lazy="true" cascade="all"  > 
      <key column="ID_TESTSPECIFICATION" /> 
      <index-many-to-many class="Teststep" column="ID_TESTSTEP"/> 
      <one-to-many class="VirtualTeststepData"/> 
    </map> 
  </class> 
</hibernate-mapping> 

Code:

public class Testspecification 
{ 
    public virtual Decimal Id { get; set; } 


    protected virtual IDictionary<Teststep, VirtualTeststepData> VirtualIncarnations { get; set; } 


    public Testspecification() 
    { 
      VirtualIncarnations = new Dictionary<Teststep, VirtualTeststepData>(); 
    } 
} 

VirtualTeststepData + VirtualTeststepDataKey:

Code:

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
assembly="ETToolV2" namespace="Continental.ETTool"> 
  <class name="VirtualTeststepData" table="ET_VIRTUALTESTSTEPDATA" lazy="true" > 
    <composite-id class="VirtualTeststepDataKey" name="Key"> 
      <key-many-to-one name="AssignedTestspecification" column="ID_TESTSPECIFICATION" class="Testspecification" /> 
      <key-many-to-one name="VirtualStep" column="ID_TESTSTEP" class="Teststep" /> 
    </composite-id> 
    <property name="Parameter0" type="String" column="PARAMETER0" /> 
    <property name="Parameter1" type="String" column="PARAMETER1" /> 
    <property name="Parameter2" type="String" column="PARAMETER2" /> 
    <property name="Parameter3" type="String" column="PARAMETER3" /> 
    <property name="Confirmed" type="Decimal" column="CONFIRMED" /> 
    <property name="CreationDate" type="DateTime" column="CREATION_DATE" /> 
  </class> 
</hibernate-mapping> 

Code:

public class VirtualTeststepData 
 { 
    public virtual VirtualTeststepDataKey Key { get; set; } 
    public virtual String Parameter0 { get; set; } 
    public virtual String Parameter1 { get; set; } 
    public virtual String Parameter2 { get; set; } 
    public virtual String Parameter3 { get; set; } 
    //public virtual Teststep VirtualStep { get; set; } 
    //public virtual Testspecification AssignedTestspecification { get; set; } 
    public virtual Decimal Confirmed { get; set; } 
    public virtual DateTime CreationDate { get; set; } 


    public VirtualTeststepData() 
    { 
      this.Confirmed = 0; 
      CreationDate = DateTime.Now; 
      Key = new VirtualTeststepDataKey(); 
    } 


    public override bool Equals(object obj) 
    { 
      return base.Equals(obj); 
    } 


    public override int GetHashCode() 
    { 
      return base.GetHashCode(); 
    } 


    public override string ToString() 
    { 
      return base.ToString(); 
    } 
  } 

Code:

  public class VirtualTeststepDataKey: ISerializable 
  { 
    public virtual Testspecification AssignedTestspecification { get; set; } 
    public virtual Teststep VirtualStep { get; set; } 


    #region ISerializable Member 


    public void GetObjectData(SerializationInfo info, StreamingContext context) 
    { 
      throw new NotImplementedException(); 
    } 


    #endregion 


    public override bool Equals(object obj) 
    { 
      if (obj.GetType() != typeof(VirtualTeststepDataKey)) 
        return false; 


      VirtualTeststepDataKey compareKey = (VirtualTeststepDataKey)obj; 


      return (compareKey.AssignedTestspecification.Id == this.AssignedTestspecification.Id) && (compareKey.VirtualStep.Id == this.VirtualStep.Id); 
    } 


    public override int GetHashCode() 
    { 
      return base.GetHashCode(); 
    } 
  } 
} 

I use it like the following:

Code:

public virtual VirtualTeststepData GetVirtualTeststepData(Teststep 
teststep, Testspecification testspecification) 
{ 
  result = new VirtualTeststepData(); 
  result.Key.AssignedTestspecification = testspecification; 
  result.Key.VirtualStep = teststep; 
  this.VirtualIncarnations.Add(teststep, result); 


  return result; 
} 

if I do a Session.Save(testspecification) later in my code everything
works fine, but there is no INSERT statement for VirtualTeststepData I
created in the function above, though it creates an Update statement to attach the VirtualTeststepData to the Testspecification. Anybody got an idea how I could solve this?

Thanks for your help =)

Greetings,
Reflection

wolli · **Posted:** Fri Mar 06, 2009 6:23 am

Hibernate can't decide if your item is new or not:

Quote:

Since a composite identifier must be assigned to the object before saving it, we can't use unsaved-value of the identifier to distinguish between newly instantiated instances and instances saved in a previous session.
You may instead implement IInterceptor.IsUnsaved() if you wish to use SaveOrUpdate() or cascading save / update. As an alternative, you may also set the unsaved-value attribute on a <version> (or <timestamp>) element to specify a value that indicates a new transient instance. In this case, the version of the entity is used instead of the (assigned) identifier and you don't have to implement IInterceptor.IsUnsaved() yourself.

reflection · **Joined:** Wed Feb 11, 2009 10:58 am **Posts:** 55

Thank you very much!!!!

I think I would have never found that :) works like a charm now.

Is there another IInterceptor Interface? The only one I know is the one for Sessions, but that doesn't support IsUnsaved(). Is ther another IInterceptor Interface I can use anywhere else?

Thanks in advance!

Reflection

wolli · **Posted:** Mon Mar 09, 2009 12:36 pm

There's only NHibernate.IInterceptor. This interface has an IsUnsaved(..) method. YOu can start your work with subclassing EmptyInterceptor.

reflection · **Joined:** Wed Feb 11, 2009 10:58 am **Posts:** 55

This is the Empty class, when I implement an Interceptor. I already did this, because I needed an OnFlushDirty(...) Handler.

There is no IsUnsaved(...). Maybe you mean IsTransient(...)?

Code:

class ETToolInterceptor: IInterceptor
{

    public void AfterTransactionBegin(ITransaction tx)
    {
      
    }

    public void AfterTransactionCompletion(ITransaction tx)
    {
      
    }

    public void BeforeTransactionCompletion(ITransaction tx)
    {
      
    }

    public int[] FindDirty(object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, NHibernate.Type.IType[] types)
    {
      return null;
    }

    public object GetEntity(string entityName, object id)
    {
      return null;
    }

    public string GetEntityName(object entity)
    {
      return "";
    }

    public object Instantiate(string entityName, EntityMode entityMode, object id)
    {
      return null;
    }

    public bool? IsTransient(object entity)
    {
      
      return null;
    }

    public void OnCollectionRecreate(object collection, object key)
    {
      
    }

    public void OnCollectionRemove(object collection, object key)
    {
    }

    public void OnCollectionUpdate(object collection, object key)
    {
    }

    public void OnDelete(object entity, object id, object[] state, string[] propertyNames, NHibernate.Type.IType[] types)
    {

    }

    public bool OnFlushDirty(object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, NHibernate.Type.IType[] types)
    {
 
    }

    public bool OnLoad(object entity, object id, object[] state, string[] propertyNames, NHibernate.Type.IType[] types)
    {
      return false;
    }

    public NHibernate.SqlCommand.SqlString OnPrepareStatement(NHibernate.SqlCommand.SqlString sql)
    {
      return sql;
    }

    public bool OnSave(object entity, object id, object[] state, string[] propertyNames, NHibernate.Type.IType[] types)
    {
      return false;
    }

    public void PostFlush(System.Collections.ICollection entities)
    {

    }

    public void PreFlush(System.Collections.ICollection entities)
    {

    }

    public void SetSession(ISession session)
    {

    }
  }
}

wolli · **Posted:** Tue Mar 10, 2009 4:48 am

Which NHibernate version do you use ? I'm using 1.2 and my interface has the method !?

reflection · **Joined:** Wed Feb 11, 2009 10:58 am **Posts:** 55

I use the Version 2.0.1.GA Released: September 29, 2008

It is the Version stated as latest Version on http://www.hibernate.org/343.html

wolli · **Posted:** Tue Mar 10, 2009 7:35 am

Hmm ... I doubt that the method was removed, but there is a better way with 2.0 anyway. Checkout the event system:

http://www.nhforge.org/doc/nh/en/index.html#objectstate-events

reflection · **Joined:** Wed Feb 11, 2009 10:58 am **Posts:** 55

OK... I've got an old Documentation then. It's for Version 1.2.0. Thought it was the actual version :)

But there's still no IsUnsaved(...) Event.

Code:

<xs:simpleType name="listenerType">
  <xs:restriction base="xs:string">
    <xs:enumeration value="auto-flush" />
    <xs:enumeration value="merge" />
    <xs:enumeration value="create" />
    <xs:enumeration value="create-onflush" />
    <xs:enumeration value="delete" />
    <xs:enumeration value="dirty-check" />
    <xs:enumeration value="evict" />
    <xs:enumeration value="flush" />
    <xs:enumeration value="flush-entity" />
    <xs:enumeration value="load" />
    <xs:enumeration value="load-collection" />
    <xs:enumeration value="lock" />
    <xs:enumeration value="refresh" />
    <xs:enumeration value="replicate" />
    <xs:enumeration value="save-update" />
    <xs:enumeration value="save" />
    <xs:enumeration value="pre-update" />
    <xs:enumeration value="update" />
    <xs:enumeration value="pre-load" />
    <xs:enumeration value="pre-delete" />
    <xs:enumeration value="pre-insert" />
    <xs:enumeration value="post-load" />
    <xs:enumeration value="post-insert" />
    <xs:enumeration value="post-update" />
    <xs:enumeration value="post-delete" />
    <xs:enumeration value="post-commit-update" />
    <xs:enumeration value="post-commit-insert" />
    <xs:enumeration value="post-commit-delete" />
  </xs:restriction>
</xs:simpleType>

This is the IInterceptor Interface in my Version of NHibernate:

Code:

namespace NHibernate
{
  public interface IInterceptor
  {
    void AfterTransactionBegin(ITransaction tx);
    void AfterTransactionCompletion(ITransaction tx);
    void BeforeTransactionCompletion(ITransaction tx);
    int[] FindDirty(object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, IType[] types);
    object GetEntity(string entityName, object id);
    string GetEntityName(object entity);
    object Instantiate(string entityName, EntityMode entityMode, object id);
    
    //
    // Zusammenfassung:
    //     Called when a transient entity is passed to SaveOrUpdate.
    //
    // Parameter:
    //   entity:
    //     A transient entity
    //
    // Rückgabewerte:
    //     Boolean or null to choose default behaviour
    //
    // Hinweise:
    //     The return value determines if the object is saved true - the entity is passed
    //     to Save(), resulting in an INSERT false - the entity is passed to Update(),
    //     resulting in an UPDATE null - Hibernate uses the unsaved-value mapping to
    //     determine if the object is unsaved
    bool? IsTransient(object entity);
    
    void OnCollectionRecreate(object collection, object key);
    void OnCollectionRemove(object collection, object key);
    void OnCollectionUpdate(object collection, object key);
    void OnDelete(object entity, object id, object[] state, string[] propertyNames, IType[] types);
    bool OnFlushDirty(object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, IType[] types);
    bool OnLoad(object entity, object id, object[] state, string[] propertyNames, IType[] types);
    SqlString OnPrepareStatement(SqlString sql);
    bool OnSave(object entity, object id, object[] state, string[] propertyNames, IType[] types);
    void SetSession(ISession session);
  }
}

I left the documentation to IsTransient(...), because I think this matches the IsUnsaved function. Maybe you can do something like:

Code:

bool? IsTransient(object entity)
{
  if( entity.getType() == typeof(VirtualTeststepData) )
  {
    //Use another Session to determine if the instance is already in DB
    if( IsInDB )
      return true;
    else
      return false;
  }
  else
     return null;

}

Though I assume this would not be very performant if you do a lot of changes to different VirtualTeststepDatas.