Error Functions In Access
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Applies To: Access 2016, Access 2013, Access 2010, Access 2007, Access 2010 Developer, Access 2007 Developer, Access 2013 Developer, Less Applies To: Access 2016 , Access 2013 , Access 2010 , Access 2007 access error handling , Access 2010 Developer , Access 2007 Developer , Access 2013 Developer error functions in index expression must be marked immutable , More... Which version do I have? More... Note: The function, method, object, or property described in this topic is error functions excel disabled if the Microsoft Jet Expression Service is running in sandbox mode, which prevents the evaluation of potentially unsafe expressions. For more information on sandbox mode, search for "sandbox mode" in Help.
Error Function Values
Returns the error message that corresponds to a given error number. Syntax Error [ (errornumber) ] The optional errornumberargument can be any valid error number. If errornumber is a valid error number, but is not defined, Error returns the string "Application-defined or object-defined error." If errornumber is not valid, an error occurs. If errornumber is omitted, the message corresponding to the most recent functions microsoft access run-time error is returned. If no run-time error has occurred, or errornumber is 0, Error returns a zero-length string (""). Remarks Examine the property settings of the Err object to identify the most recent run-time error. The return value of the Error function corresponds to the Description property of the Err object. Example Note: Examples that follow demonstrate the use of this function in a Visual Basic for Applications (VBA) module. For more information about working with VBA, select Developer Reference in the drop-down list next to Search and enter one or more terms in the search box. This example uses the Error function to print error messages that correspond to the specified error numbers.
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' Loop through values 61 - 64.
For ErrorNumber = 61 To 64
' Print error to Immediate window.
Debug.Print Error(ErrorNumber)
Next ErrorNumber
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Aggregate Functions In Access
Preferences Send a message Log Out Microsoft Use Nz() to replace an error message in Access A missing value can lead to confusion by returning error values. But a properly used Nz() function can turn an error https://support.office.com/en-us/article/Error-Function-e0ebb46e-9a2c-461e-9136-15887092011e message into an understandable and expected value. By Susan Harkins | in Microsoft Office, February 6, 2009, 2:14 AM PST RSS Comments Facebook Linkedin Twitter More Email Print Reddit Delicious Digg Pinterest Stumbleupon Google Plus Missing values can confuse users if handled incorrectly. For instance, a calculated control in a form or report has the potential to return #Error if a value is missing. That's going to leave your users scratching their heads and reaching http://www.techrepublic.com/blog/microsoft-office/use-nz-to-replace-an-error-message-in-access/ for the phone to ask what's up. You can avoid their confusion (and your interruption) by using the Nz() function to force a value — usually 0. This function's syntax is simple: Nz(expression, replacementvalue) where expression is the field or value being evaluated and replacementvalue is the value or text you want to display, or pass, when there's no value. (You can learn more about Nz() in Help.) I've found that applying Nz() correctly can be a bit of a puzzle for some folks. The key is to wrap every field or value in an Nz() function, not the entire expression. For instance, the following expression has the potential to return #Error, despite the Nz() function: =Nz(Sum(Price * Quantity, 0)) The correct syntax follows: =Sum(Nz(Price, 0) * Nz(Quantity, 0)) Wrap each field within the expression to catch each missing value before the SUM() function tries to evaluate it. Of course, the best solution is to prevent missing values in the first place. To do so at the table level, set the field's Required property to Yes. However, doing so isn't always appropriate or practical. That's when the Nz() function comes in handy — as long as you apply it correctly. Comments Facebook Linkedin Twitter More Email Print Reddit Delicious Digg Pinterest Stumbleupon Google Plus About Susan Harkins Susan Sales Harkins is
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controls don't exist, you cannot sum them. In forms The problem does not arise in forms that display the new record. It does occur if the form's Allow Additions property is Yes, or if the form is bound to a non-updatable query. To avoid the problem, test the RecordCount of the form's Recordset. In older versions of Access, that meant changing: =Sum([Amount]) to: =IIf([Form].[Recordset].[RecordCount] > 0, Sum([Amount]), 0) Access 2007 and later have a bug, so that expression fails. You need a function. Copy this function into a standard module, and save the module with a name such as Module1: Public Function FormHasData(frm As Form) As Boolean 'Purpose: Return True if the form has any records (other than new one). ' Return False for unbound forms, and forms with no records. 'Note: Avoids the bug in Access 2007 where text boxes cannot use: ' [Forms].[Form1].[Recordset].[RecordCount] On Error Resume Next 'To handle unbound forms. FormHasData = (frm.Recordset.RecordCount <> 0&) End Function Now use this expression in the Control Source of the text box: =IIf(FormHasData([Form]), Sum([Amount]), 0) Notes Leave the [Form] part of the expression as it is (i.e. do not substitute the name of your form.) For Access 97 or earlier, use RecordsetClone instead of Recordset in the function. A form with no records still has display problems. The workaround may not display the zero, but it should suppress the #Error. In reports Use the HasData property property, specifically for this purpose. So, instead of: =Sum([Amount]) use: =IIf([Report].[HasData], Sum([Amount]), 0) If you have many calculated controls, you need to do this on each one. When Access discovers one calculated control that it cannot resolve, it gives up on calculating the others. Therefore one bad expression can cause other calculated controls to display #Error, even if those controls are bound