Access 2007 Vba Error Handling
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Access Vba Error Handling Module
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Ms Access Vba Error Handling
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Ms Access Vba Error Handling Example
Run-Time Errors in VBA Compact and Repair a Database Recover Tables Deleted from a Database Handle Run-Time Errors in VBA TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Handle Run-Time Errors vba error handling best practices in VBA Office 2013 and later Other Versions Office 2010 Contribute to this content Use GitHub to suggest and submit changes. See our guidelines for contributing to VBA documentation. 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 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 t
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 vba error handling loop simplest approach is to display the Access error message and quit the procedure. vba error handling function Each procedure, then, will have this format (without the line numbers): 1 Sub|Function SomeName() 2 On Error GoTo Err_SomeName ' vba error handling exit sub Initialize error handling. 3 ' Code to do something here. 4 Exit_SomeName: ' Label to resume after error. 5 Exit Sub|Function ' Exit before error handler. 6 Err_SomeName: ' Label to jump https://msdn.microsoft.com/en-us/library/office/ff193267.aspx to on error. 7 MsgBox Err.Number & Err.Description ' Place error handling here. 8 Resume Exit_SomeName ' Pick up 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 http://allenbrowne.com/ser-23a.html ' 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 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 ' Pu
Editions: US United States Australia United Kingdom Japan Newsletters Forums Resource Library Tech Pro Free Trial Membership Membership My Profile People Subscriptions My stuff Preferences Send a message Log Out TechRepublic Search GO Topics: CXO Cloud Big Data Security Innovation Software Data http://www.techrepublic.com/blog/how-do-i/how-do-i-add-custom-error-handling-to-my-access-forms-and-reports/ Centers Networking Startups Tech & Work All Topics Sections: Photos Videos All Writers Newsletters Forums Resource Library Tech Pro Free Trial Editions: US United States Australia United Kingdom Japan Membership Membership My Profile People Subscriptions My stuff Preferences Send http://www.cpearson.com/excel/errorhandling.htm a message Log Out Data Management How do I... Add custom error handling to my Access forms and reports? By Susan Harkins | in How Do I..., July 18, 2007, 6:11 AM PST RSS Comments Facebook Linkedin Twitter More vba error Email Print Reddit Delicious Digg Pinterest Stumbleupon Google Plus This information is also available as a PDF download. When capturing and handling errors, you probably think of the Err object, which stores information about the current run-time error. If a form or report encounters an error, you'll find the information you need in an event — the object's Error event to be exact. By default, Access handles action errors without any help from you. On occasion, you vba error handling might find you want a little more control. When that's the case, take matters into your own hands by usurping the object's Error event. About the Error event Both forms and reports sometimes generate action errors, such as trying to delete a record protected by referential integrity or trying to add a new record without filling in required fields. When this happens, Access displays a predefined warning message that's usually adequate. But if you prefer, you can take charge of the event and force it to do the following: Inhibit the internal message Display a custom message Redirect the application's flow Using the Error event A common form error occurs when you try to save a new record without filling in all required fields (required at the table level). Figure A shows how Access handles this error in a simple form based on the Customers table in Northwind (the sample database that comes with Access). Figure A In this case, the default message is sufficient. In fact, most are. So you probably won't use this event to change the message. Generally, you'll use it to redirect the flow, changing what happens after the Error event occurs. The Error event uses the following syntax: Private Sub object_Error(DataErr As Integer, Response As Integer) End Sub where object is the name of the Form or Report object, DataErr is the error code that id
three flavors: compiler errors such as undeclared variables that prevent your code from compiling; user data entry error such as a user entering a negative value where only a positive number is acceptable; and run time errors, that occur when VBA cannot correctly execute a program statement. We will concern ourselves here only with run time errors. Typical run time errors include attempting to access a non-existent worksheet or workbook, or attempting to divide by zero. The example code in this article will use the division by zero error (Error 11) when we want to deliberately raise an error. Your application should make as many checks as possible during initialization to ensure that run time errors do not occur later. In Excel, this includes ensuring that required workbooks and worksheets are present and that required names are defined. The more checking you do before the real work of your application begins, the more stable your application will be. It is far better to detect potential error situations when your application starts up before data is change than to wait until later to encounter an error situation. If you have no error handling code and a run time error occurs, VBA will display its standard run time error dialog box. While this may be acceptable, even desirable, in a development environment, it is not acceptable to the end user in a production environment. The goal of well designed error handling code is to anticipate potential errors, and correct them at run time or to terminate code execution in a controlled, graceful method. Your goal should be to prevent unhandled errors from arising. A note on terminology: Throughout this article, the term procedure should be taken to mean a Sub, Function, or Property procedure, and the term exit statement should be taken to mean Exit Sub, Exit Function, or Exit Property. The term end statement should be taken to mean End Sub , End Function, End Property, or just End. The On Error Statement The heart of error handling in VBA is the On Error statement. This statement instructs VBA what to do when an run time error is encountered. The On Err