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Using Data Controls and Nulls
Posted on 1998-07-16
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???
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???
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3 Comments
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
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
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
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