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Error converting data type varchar to numeric in UPDATE statement in VB.NET

Posted on 2015-02-23
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400 Views
Last Modified: 2015-03-03
Hi all.

I'm getting the error converting data type varchar to numeric error whenever the txtMinQty textbox is left blank, I want to be able to UPDATE the field MinQty to NULL if the textbox is left blank or if the number is cleared out by the end user. If it's not blank then update it with the number in the text box. Unfortunately, it's not letting me update the field to NULL. Below is my code, what am I doing wrong? Thank you in advance.

cmd.CommandText = "UPDATE PriceSheet_PendingHeader SET MinQty = '" & If(String.IsNullOrWhiteSpace(txtMinQty.Text), DBNull.Value, Integer.Parse(txtMinQty.Text)) & "' WHERE PriceSheetPendingID = @PriceSheetPendingID_Update"
        cmd.Parameters.AddWithValue("@PriceSheetPendingID_Update", txtPriceSheetPendingID.Text)

        cmd.ExecuteNonQuery()

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Question by:printmedia
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3 Comments
 
LVL 40
ID: 40626348
What is the error that you get.

Is the field marked to accept Null values in the table definition?

Why not simply let the zero-length string go into the VarChar. In many scenarios, if this is decided from the start (so as not to break old queries and stored procedures), this can be considered as the Null.
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Accepted Solution

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printmedia earned 0 total points
ID: 40626364
Nevermind, I figured it out by doing the following:


If (String.IsNullOrWhiteSpace(txtMinQty.Text)) Then
            cmd.CommandText = "UPDATE PriceSheet_PendingHeader SET MinQty = NULL WHERE PriceSheetPendingID = @PriceSheetPendingID_Update1"
            cmd.Parameters.AddWithValue("@PriceSheetPendingID_Update1", txtPriceSheetPendingID.Text)
        Else
            cmd.CommandText = "UPDATE PriceSheet_PendingHeader SET MinQty = " & Integer.Parse(txtMinQty.Text) & " WHERE PriceSheetPendingID = @PriceSheetPendingID_Update2"
            cmd.Parameters.AddWithValue("@PriceSheetPendingID_Update2", txtPriceSheetPendingID.Text)
        End If

cmd.ExecuteNonQuery()

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Author Closing Comment

by:printmedia
ID: 40641433
Solved my own question.
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