[nhibernate-issues] [JIRA] Created: (NH-788) Incrementing a nullable <Version> field fails

[NHibernate J. <mik...@us...>]

Incrementing a nullable <Version> field fails
---------------------------------------------

         Key: NH-788
         URL: http://jira.nhibernate.org/browse/NH-788
     Project: NHibernate
        Type: Bug
  Components: Core  
    Versions: 1.2.0.Beta1    
    Reporter: Jens Dein
    Priority: Minor
 Attachments: Serialno.hbm.xml

I have defined my version tag like this : 

    <version
      name="Hbversion"                               
      column="HBVersion"                            
      type="System.Int32"                                  
      unsaved-value="null"    
    />

and in my class like this :

  private System.Int32? _hbversion;

and when trying to persist the code I get an error in the following code :

	public class Int32Type : ValueTypeType, IDiscriminatorType, IVersionType

		public virtual object Next( object current )
		{
			return ( ( int )current ) + 1;
		}

besause current is typecasted to int without checking for null. Code might be changed to the following :

	public virtual object Next( object current )
	{
            if (current == null)
                return Seed;
            else
                return ((int)current) + 1;
	}

I hope I havent misunderstood totally how to use these nullables, but I believe I found advise on the net stating that it should be possible to do it this way in the 1.2 version.

Using .NET 2.0 of course and SQL Server 2005.

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