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

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

     [ http://jira.nhibernate.org/browse/NH-788?page=comments#action_14391 ]
     
Jens Dein commented on NH-788:
------------------------------

Sorry about that!

I was actually just trying to generate a test case but not w I can't make it fail. I'm a bit new at this so I'm not quite sure what it is I have done - but it seems that the problem is gone.

> 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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