Solved

Using Data Controls and Nulls

Posted on 1998-07-16
3
127 Views
Last Modified: 2010-05-18
Hi.  I have created a simple application.   It has a dBase database with only 2 fields.  Name, and age.  Name
is a text field, and age is a numeric field.    On my VB app, I have a data control linked to the database, and two text boxes linked to the fields.  I have another button labeled Update.   When I run the program, I use my data
control to move through the records.  But, if I stop on a record, and delete the age that was there, and hit my update button, it  gives me a data conversion error, because I'm not storing a numeric value in the age field.  How can I
make my program allow storing of empty strings in a numeric field???

0
Comment
Question by:ssteeves
3 Comments
 
LVL 8

Accepted Solution

by:
MikeP090797 earned 80 total points
ID: 1465970
There is no way you can store string in such field, but you can store 0, and when your record loads, replace it with "" in the textbox
0
 
LVL 14

Expert Comment

by:waty
ID: 1465971
You could use a function like the following. It works in all the
cases, and doesn't break for NULL values.

Function ReadRecordSet(record As Recordset, szChamps As String)
   ' *** Check for NULL value

   If IsNull(record(szChamps)) Then
      Select Case VarType(record(szChamps))
         Case vbLong: ReadRecordSet = 0
         Case vbString: ReadRecordSet = ""
         Case vbDate: ReadRecordSet = "01/01/1980"
      End Select
   Else
      ReadRecordSet = record(szChamps)
   End If

End Function

0
 
LVL 1

Author Comment

by:ssteeves
ID: 1465972
That's pretty much what I did.  Thanks for the help guys.
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction While answering a recent question about filtering a custom class collection, I realized that this could be accomplished with very little code by using the ScriptControl (SC) library.  This article will introduce you to the SC library a…
Article by: Martin
Here are a few simple, working, games that you can use as-is or as the basis for your own games. Tic-Tac-Toe This is one of the simplest of all games.   The game allows for a choice of who goes first and keeps track of the number of wins for…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question