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HomeHomeArchived Discus...Archived Discus...Developing Under Previous Versions of .NETDeveloping Under Previous Versions of .NETASP.Net 2.0ASP.Net 2.0DAL+ tutorial, CodeSmith, Nullable values, Sql Datatypes, etcDAL+ tutorial, CodeSmith, Nullable values, Sql Datatypes, etc
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6/29/2007 8:47 AM
 
Fred

Joined: 6/17/2007
Posts: 16

I hope this is the right location for this question.

I am new to DNN and have been working with the DAL+ tutorial and eventually the CodeSmth version to set up a new module.

What I am finding is that my numeric SQL datatypes (int, float) cannot be loaded or retrieved if the fields are Null. I am receiving page load errors when inserting a new record. Similarly checkboxes do not by default load Boolean SQL datatypes.

I do not expect these to work out of the box. But I am confident that there is a prescribed method for working with these issues.

What is the solution to this problem?

What is the cleanest (best practice) to successfully implement Nullable fields?
 
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6/29/2007 11:15 AM
 
Michael Washington


Michael Washington's Avatar

www.LightSwitchHelpWebsite.com
Joined: 7/17/2004
Posts: 3526

<DataObjectMethod(DataObjectMethodType.Insert)> _
Public Shared Sub ThingsForSale_Insert(ByVal ThingsForSaleInfo As ThingsForSaleInfo)
    DataProvider.Instance().ExecuteNonQuery("ThingsForSale_Insert", ThingsForSaleInfo.ModuleId, GetNull(ThingsForSaleInfo.UserID), GetNull(ThingsForSaleInfo.Category.ToString), GetNull(ThingsForSaleInfo.Description.ToString), GetNull(ThingsForSaleInfo.Price))
End Sub

Private Shared Function GetNull(ByVal Field As Object) As Object
    Return Null.GetNull(Field, DBNull.Value)
End Function


Michael Washington
http://ADefWebserver.com
www.ADefHelpDesk.com
A Free Open Source DotNetNuke Help Desk Module
 
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6/29/2007 11:58 AM
 
Pril

Joined: 1/25/2005
Posts: 150

Best practice when you do this from scratch: you should transfer two parameters - first is that form was actually send by user (already supported by asp.net with event parameter) and second is request for checkbox parameter. With this combination you are always sure if checkbox is checked or not.

Regards,

Primoz



www.indoolab.com
 
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