Error Handling In Vba Access 2007
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resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you error handling vba access 2010 requested has been removed. You’ll be auto redirected in 1 second. How Do I... access vba error handling module in Access 2007 Miscellaneous Maintenance Maintenance How to: Handle Run-Time Errors in VBA How to: Handle Run-Time Errors in VBA How to: error handling vba function Handle Run-Time Errors in VBA How to: Compact and Repair a Database How to: Recover Tables Deleted from a Database How to: Handle Run-Time Errors in VBA TOC Collapse the table of content Expand the
Error Handling Vba Loop
table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. How to: Handle Run-Time Errors in VBA Office 2007 Access Developer Reference Errors and Error Handling When you are programming an application, you need to consider what happens when an error occurs. An error can occur in your application for one of error handling in vba excel two of reasons. First, some condition at the time the application is running makes otherwise valid code fail. For example, if your code attempts to open a table that the user has deleted, an error occurs. Second, your code may contain improper logic that prevents it from doing what you intended. For example, an error occurs if your code attempts to divide a value by zero. If you have not implemented error handling, Visual Basic halts execution and displays an error message when an error occurs in your code. The user of your application is likely to be confused and frustrated when this happens. You can forestall many problems by including thorough error-handling routines in your code to handle any error that may occur. When adding error handling to a procedure, you should consider how the procedure will route execution when an error occurs. The first step in routing execution to an error handler is to enable an error handler by including some form of the On Error statement within the procedure. The On Error statement directs execution in event of an error. If there is no On Error statement, Visual Basic simply halts execution and displays an error message when an error occurs. When an error occurs in a procedure with an ena
a full version of Access, while a run-time version just crashes. For a more detailed approach to error handling, see FMS' article on Error Handling and Debugging. The simplest approach is to display the Access error message error handling in vba macro and quit the procedure. Each procedure, then, will have this format (without the line numbers):
Vba Excel On Error Resume Next
1 Sub|Function SomeName() 2 On Error GoTo Err_SomeName ' Initialize error handling. 3 ' Code to do something here. 4 Exit_SomeName: ' Label
If Error Vba
to resume after error. 5 Exit Sub|Function ' Exit before error handler. 6 Err_SomeName: ' Label to jump to on error. 7 MsgBox Err.Number & Err.Description ' Place error handling here. 8 Resume Exit_SomeName ' Pick up https://msdn.microsoft.com/en-us/library/bb258159(v=office.12).aspx again and quit. 9 End Sub|Function For a task where several things could go wrong, lines 7~8 will be replaced with more detail: Select Case Err.Number Case 9999 ' Whatever number you anticipate. Resume Next ' Use this to just ignore the line. Case 999 Resume Exit_SomeName ' Use this to give up on the proc. Case Else ' Any unexpected error. Call LogError(Err.Number, Err.Description, "SomeName()") Resume Exit_SomeName End Select The Case Else in this http://allenbrowne.com/ser-23a.html example calls a custom function to write the error details to a table. This allows you to review the details after the error has been cleared. The table might be named "tLogError" and consist of: Field Name Data Type Description ErrorLogID AutoNumber Primary Key. ErrNumber Number Long Integer. The Access-generated error number. ErrDescription Text Size=255. The Access-generated error message. ErrDate Date/Time System Date and Time of error. Default: =Now() CallingProc Text Name of procedure that called LogError() UserName Text Name of User. ShowUser Yes/No Whether error data was displayed in MsgBox Parameters Text 255. Optional. Any parameters you wish to record. Below is a procedure for writing to this table. It optionally allows recording the value of any variables/parameters at the time the error occurred. You can also opt to suppress the display of information about the error. Function LogError(ByVal lngErrNumber As Long, ByVal strErrDescription As String, _ strCallingProc As String, Optional vParameters, Optional bShowUser As Boolean = True) As Boolean On Error GoTo Err_LogError ' Purpose: Generic error handler. ' Logs errors to table "tLogError". ' Arguments: lngErrNumber - value of Err.Number ' strErrDescription - value of Err.Description ' strCallingProc - name of sub|function that generated the error. ' vParameters - optional string: List of parameters to record. ' bShowUser - optional boolean: If False, suppresses display. ' Author: Allen Browne, allen
error condition is raised. If you have made provision for that possibility, your code can recover gracefully and continue or terminate as appropriate; http://datagnostics.com/dtips/vbaerrors.html if not, Access will do its best to handle the error itself -- http://www.devhut.net/2010/10/07/ms-access-vba-error-handling/ usually not in the way you would prefer. An untrapped, or unhandled, error is one that is raised by your application and not handled by error-handling code that you write. Such errors are then dealt with by Access's default error-handling routine, which displays the description of the error and, depending on your option error handling settings, may allow you to debug the code. But it also tends to reset the VBA project, so that all global variables are returned to their uninitialized states. And if the database is run using the Access run-time module and not the full version of Access, the application will simply shut down. To avoid having this happen, put error-handling code in (at least) all your top-level error handling in VBA procedures. By "top-level" procedures, I mean those that are not called by other procedures you write, but rather are triggered by events. You can also write whatever specialized error-handling you want for lower-level procedures that are called from the top-level procedures, but if a lower-level procedure doesn't have its own error-handling code, its errors will be handled by a higher-level procedure's error-handler, if there is one, so you don't *necessarily* have to write an error-handler for every procedure. By error-handling code, I refer to using the On Error statement to define what will happen and where code execution will continue in the event of an error being raised by your code. Most often you will want to use the "On Error GoTo" form of the statement, to transfer control to an error-handling section in the procedure, from which section, eventually, the Resume statement is used to continue execution after the error has been dealt with. An alternative to this is "in-line" error-handling, which is done by using the "On Error Resume Next" statement. In that case, your own code checks after executing each statement, to see if an error has occurred, and deals with errors right
Comments Before delving into actual programming functions and sub-routine, we must first establish an error handler. An error handler is a bit of code which will do pre-defined actions whenever an error occurs. For instance, generate a message to the user or developper describing the nature of the error. For an error handler to be useful, it must provide a minimum of information in its message to the user. Below is a typical example of an error handler I use. Modify it in any way to suit your exact needs. On Error GoTo Error_Handler 'Your code will go here Error_Handler_Exit: On Error Resume Next Exit {PROCEDURE_TYPE} Error_Handler: MsgBox "The following error has occured" & vbCrLf & vbCrLf & _ "Error Number: " & Err.Number & vbCrLf & _ "Error Source: {PROCEDURE_NAME}/{MODULE_NAME}" & vbCrLf & _ "Error Description: " & Err.Description, vbCritical, _ "An Error has Occured!" Resume Error_Handler_Exit A Concrete Example Sub HelloWorld() On Error GoTo Error_Handler MsgBox "Hello Word!" Error_Handler_Exit: On Error Resume Next Exit Sub Error_Handler: MsgBox "The following error has occured" & vbCrLf & vbCrLf & _ "Error Number: " & Err.Number & vbCrLf & _ "Error Source: YourModuleName/HelloWorld" & vbCrLf & _ "Error Description: " & Err.Description, vbCritical, _ "An Error has Occured!" Resume Error_Handler_Exit End Sub Note: Although VBA provides programmers with the possibility of using the err.source statement, it sadly does not help truly identify the culprit of the current error. This is why you must manually enter in the {MODULE_NAME} / {PROCEDURE_NAME} for each error handler. Trust me, although it may take a few extra seconds to do, it will same you loads of troubleshooting time later on (I'm talking from experience)!!! Also, if you are going to be doing some serious vba (MS Access, Word, Excel, …) work and not just a little tinkering, you should most probably seriously consider looking into the Mz-Tools a