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Excel VBA multiple error handling in the same procedure


Excel VBA multiple error handling in the same procedure

By : sonali jangra
Date : November 22 2020, 02:59 PM
wish helps you Having two or more error-handling subroutines in a procedure is definitely a design smell; that's not how VBA error-handling works.
Basically you have this:
code :
Sub Foo()
    On Error GoTo ErrHandler1
    '(code)

ErrHandler1:
    '(error handling code)

    On Error GoTo ErrHandler2
    '(code)

ErrHandler2:
    '(error handling code)

End Sub
Resume NoError1
Resume NoError2


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Handling multiple cursors in stored procedure

Handling multiple cursors in stored procedure


By : itchipod
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can nest cursors, but you should be looking to remove those cursors in favour of a SET-based operation if you can. Otherwise, it's likely performance is not going to be great, especially with larger volumes of data. I'd only use cursors / loop as a last resort.
Further explanation:
Stored Procedure Error Handling - Clean up but return original error

Stored Procedure Error Handling - Clean up but return original error


By : Awais
Date : March 29 2020, 07:55 AM
To fix the issue you can do I'm writing a stored procedure that needs to clean up some data if an insert fails. I'd like it to perform the clean up, but return the original error if this insert fails (primarily for logging as I want to see exactly why the insert failed). Basically like a throw; in C#. Is there a simple way to do this? , Try the following snippet.
code :
DECLARE @errNum int
DECLARE @rowCount int

BEGIN TRY
    INSERT INTO [TABLE] (COL1) VALUES ('1")
END TRY
BEGIN CATCH
    SET @errNum = @@ERROR
    SET @rowCount = @@ROWCOUNT
    RAISEERROR(@errNum)
END CATCH
VBA Excel Error Handling - especially in functions - Professional Excel Development Style

VBA Excel Error Handling - especially in functions - Professional Excel Development Style


By : salvador felix
Date : March 29 2020, 07:55 AM
help you fix your problem I needed a bit more help on this specific technique so I went right to the source and Mr. Bovey was gracious enough to reply. He gave me permission to post his response to the StackOverflow community.
The instructions below refer to his preferred method of error handling for functions the "boolean error handling" technique and not to the alternate "rethrow method", both described in his book "Professional Excel Development" 2nd edition.
code :
' Show how to call a function using this error handling method.
Const giBAD_RESULT As Integer = -1

Function TestMath()   ' An Entry Point

    Dim sngResult As Single
    Dim iNum As Integer

    ' Call the function, actual result goes in sngResult but it returns the error handling boolean.
    ' A true error like Div 0 will go to error handler.

    ' Set Up Error Handling for Entry Point
    Application.EnableCancelKey = xlErrorHandler
    Dim bUserCancel As Boolean
    Const sSOURCE As String = "TestMath()"
    On Error GoTo ErrorHandler
    ' End Error Set Up

    iNum = 0   ' Try 0 to create error
    If Not bDoSomeMath(iNum, sngResult) Then ERR.Raise glHANDLED_ERROR
    ' If function does parameter checking and wants to return a bad input code, check for that.
    If sngResult = giBAD_RESULT Then
        MsgBox ("Bad input to bDoSomeMath " & iNum)
    Else
        MsgBox ("I believe the answer is " & sngResult)
    End If

ErrorExit:
    On Error Resume Next
    Exit Function

ErrorHandler:
    If bCentralErrorHandler(msMODULE, sSOURCE, , True) Then
        Stop
        Resume
    Else
        Resume ErrorExit
    End If
End Function
Function bDoSomeMath(ByVal iNum As Integer, ByRef sngResult As Single) As Boolean

    ' Error handling Set Up
    Dim bReturn As Boolean
    Const sSOURCE As String = "bDoSomeMath()"
    On Error GoTo ErrorHandler
    bReturn = True
    ' End Error Set Up

    If iNum < 0 Or iNum > 1000 Then
        sngResult = giBAD_RESULT   'function failed because I only like the numbers 0 to 1000
        GoTo ErrorExit
    Else
        sngResult = 100 / iNum   ' generate a true error by iNum = 0
    End If

ErrorExit:
    On Error Resume Next
    bDoSomeMath = bReturn
    Exit Function

ErrorHandler:
    bReturn = False
    If bCentralErrorHandler(msMODULE, sSOURCE, , , True) Then
        Stop
        Resume
    Else
        Resume ErrorExit
    End If

End Function
2 or multiple Worksheet_Change different Error Handling / Excel VBA

2 or multiple Worksheet_Change different Error Handling / Excel VBA


By : user161893
Date : March 29 2020, 07:55 AM
help you fix your problem You need to add Application.EnableEvents = False so the Sub won't be triggerred multiple times. Before leaving the Sub, you need to restore the settings to the original value with Application.EnableEvents = True.
Note: I've removed your orginal Error Handlers, and I've added a way to deal with the VLookup errors, by adding If IsError(suppname) Then and If IsError(COMS) Then.
code :
Private Sub Worksheet_Change(ByVal Target As Range)

Dim suppname As Variant
Dim COMS As Variant

Application.EnableEvents = False
If Not Intersect(Range("C3"), Target) Is Nothing Then
    If Target.Value <> "" Then

        suppname = Application.VLookup(Target.Value, Workbooks("Articlepassport.xlsm") _
        .Sheets("SupplierNames").Range("B2:H1000"), 4, False)
        If IsError(suppname) Then
            Range("C5").Value = "Supplier Data not maintained!"
        Else
            Range("C5").Value = suppname
        End If
    Else
       Range("C5") = ""
    End If
End If

If Not Intersect(Range("C9"), Target) Is Nothing Then
    If Target.Value <> "" Then

        COMS = Application.VLookup(Target.Value, Workbooks("Articlepassport.xlsm") _
        .Sheets("Tabelle2").Range("A2:B11000"), 2, False)
        If IsError(COMS) Then
            Range("C11").Value = "COMS does not exist!"
        Else
            Range("C11").Value = ""
        End If
    Else
        Range("C11").Value = ""
    End If
End If
Application.EnableEvents = True ' reset settings when leaving this Sub

End Sub
Multiple Error Handling in Stored Procedure

Multiple Error Handling in Stored Procedure


By : Love Hunter
Date : March 29 2020, 07:55 AM
I hope this helps . I think the problem here is quite simple: you're expecting the TRY to fail and bump you into the CATCH block when no exception has been raised. Think about this: does the following query raise an error just because no row was updated?
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