Use CompositeId attribute with class

fsimard · **Joined:** Wed Dec 22, 2004 12:04 pm **Posts:** 7

I am trying to use the composite id with a class to define my composite id.

Code:

[NHibernate.Mapping.Attributes.CompositeId()]
[NHibernate.Mapping.Attributes.Generator(Class="assigned")]
public MyClassKey MyClassKey
{
   get
{
  return myClassKey;
}
set
{
  myClassKey=value;
}
}

MyClassKey object have 2 property define with attribute

When a generate my DDL i receive this error message.

Code:

CVSM.NMP.NMPTest.TestUserService.TestGenerateDDL : NHibernate.MappingException : The element 'urn:nhibernate-mapping-2.0:composite-id' has incomplete content. Expected 'urn:nhibernate-mapping-2.0:key-property urn:nhibernate-mapping-2.0:key-many-to-one'. An error occurred at , (15, 6).
  ----> System.Xml.Schema.XmlSchemaException : The element 'urn:nhibernate-mapping-2.0:composite-id' has incomplete content. Expected 'urn:nhibernate-mapping-2.0:key-property urn:nhibernate-mapping-2.0:key-many-to-one'. An error occurred at , (15, 6).

I know i miss an attribute or something

tks

Francis

fsimard · **Joined:** Wed Dec 22, 2004 12:04 pm **Posts:** 7

The best example i can foud to explain my problem i found it in the hibernate test.

Code:

public class ClassWithCompositeId
{
   private Id _id;
   private int _oneProperty;

   public ClassWithCompositeId(){}
   public ClassWithCompositeId(Id id ) 
   {
      _id = id;
   }

   public Id Id 
   {
      get {return _id;}
   }

   public int OneProperty 
   {
      get {return _oneProperty;}
      set {_oneProperty = value;}
   }
}

Code:

public class Id 
{
   private string _keyString;
   private short _keyShort;
   private System.DateTime _keyDateTime;

   public Id() {}

   public Id(string keyString, short keyShort, System.DateTime keyDateTime) {
      _keyString = keyString;
      _keyShort = keyShort;
      _keyDateTime = keyDateTime;
   }

   public string KeyString {
      get { return _keyString;}
      set { _keyString = value;}
   }

   public System.DateTime KeyDateTime {
      get { return _keyDateTime;}
   }

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

   public override bool Equals(object obj) {
      Id otherObj = obj as Id;

      if(otherObj==null) return false;
         if(otherObj.KeyString.Equals(this.KeyString)) return true;

      return false;

   }
}

What attribute i have to put to have the righ mapping. My goal is to have this kind of file

Code:

<class 
      name="NHibernate.Test.CompositeId.ClassWithCompositeId, NHibernate.Test" 
      table="class_w_com_id"
   >
      <composite-id name="Id" class="NHibernate.Test.CompositeId.Id, NHibernate.Test" access="nosetter.camelcase-underscore">
         <key-property name="KeyString" column="string_" type="String(20)" length="20" />
         <key-property name="KeyShort" column="short_" access="field.camelcase-underscore"/>
         <key-property name="KeyDateTime" column="date_" type="DateTime" access="nosetter.camelcase-underscore"/>
      </composite-id>
      
      <property name="OneProperty" column="one_property"/>
   </class>

KPixel · **Posted:** Thu Nov 17, 2005 10:54 am

First, you forgot the positions (1, 2...); you should always set them when you have more than one attributes on the same property.

The mapping of <composite-id> is done exactly like in XML, so read its documentation: http://nhibernate.sourceforge.net/nh-docs/html/mapping.html#mapping-declaration-compositeid

And AFAIK, you can't use your custom class as Identifier; put its content in your entity class...