I think the simplest way to implement this (regardless of whether it's right
thing or what reasons make you ask for it) is to map a nullable enum FIELD,
and make a property (that is NOT mapped in NH), which reads and writes the
field value.
something like:
*
*
*//Mapped in NH, nullable
private EnumType? _column;
//MOT mapped in NH
public EnumType Column
{
*
*get
{
*
*if(_column.GetValueOrDefault() == EnumType.None) //if null or none
*
*return EnumType.None;
*
*return _column;
*
*}
set
{
*
*if(value == EnumType.None)
*
*_column = null;
*
*_column = value;
*
*}
*
*}
*
--
Mohamed Meligy
Senior Developer, Team Lead Backup (.Net Technologies - TDG - Applications)
Injazat Data Systems
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Sent from Dubai, United Arab Emirates
On Thu, Feb 18, 2010 at 2:41 PM, Diego Mijelshon <[email protected]>wrote:
> In any case, you should use a nullable enum property instead of a "NONE"
> value.
> My impression is that you are designing your domain based on display
> concerns.
>
> Diego
>
>
>
> On Thu, Feb 18, 2010 at 00:46, Fabio Maulo <[email protected]> wrote:
>
>> IUserType if you have time to implements it otherwise just keep 0 and 1
>> since MyEnum is different than MyEnum?
>>
>> I would know who said that 0 = null.
>>
>> 2010/2/17 Peter4922 <[email protected]>
>>
>> Hi,
>>>
>>> I have a table with requests and a corresponding request class.
>>>
>>> A request has a property called Type which is a C# enumeration.
>>> Possible types are NONE=0, TRICKLEFEED=1, etc.
>>>
>>> When the type is NONE the value 0 is stored in the database. For
>>> TRICKLEFEED 1 is stored in the DB.
>>>
>>> How can I setup NHibernate to map null in the database to type NONE
>>> (the database column does allow null values). I could use
>>> ICompositeUserType but that seems overkill of this situation.
>>>
>>> Any suggestions ... ?
>>>
>>> Kind Regards
>>>
>>> Peter
>>>
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>>
>>
>> --
>> Fabio Maulo
>>
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>
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