[#NH-279] NullableString in Nullables

NHibernate

NullableString in Nullables

Created: 18/May/05 01:54 AM Updated: 20/Sep/05 02:24 PM

Component/s:

-------------

Affects Version/s:

beta-0.8.3

Fix Version/s:

1.0-rc1

File Attachments:

NullableStringType.cs (1 kb)

Description

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If a persistent object has a string property that maps to a nullable database column, binding that property to a Windows Forms control will cause an exception to be thrown if the property is null (see http://nhibernate.sourceforge.net/forum/viewtopic.php?t=30).

A value-type NullableString wrapper for System.String could be used to bind a nullable string column to a control.

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Comments

Change History

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Donald Mull - 30/May/05 07:13 PM

I have a solution for that that I use.

1. In the code for your class, start the string off as a zero length string
ex:
public class MyObject
{
string name = string.Empty;
}

2. Use a usertype to store and empty string as null in the database and read null as an empty string..

I'll post my user type tomorrow when I get to work. I'll add it to the contrib (probably Nullable.NHibernate as an implementation of IType).

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Sergey Koshcheyev - 23/Jul/05 12:35 PM

Delayed until 1.0, since it doesn't look that important and we would like to release 0.9 already.

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Donald Mull - 30/Jul/05 06:25 PM

Here is the [rather delayed] class I was talking about.

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Mike Doerfler - 01/Sep/05 08:49 PM

Added an EmptyAnsiStringType and EmptyStringType to the Nullables.NHibernate assembly.