Error Handling Vba Access 2007
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Access Vba Error Handling Module
Office 2007 Access 2007 Technical Articles Technical Articles Error Handling and Debugging Tips for Access 2007, VB, and VBA Error Handling
Error Handling Vba Function
and Debugging Tips for Access 2007, VB, and VBA Error Handling and Debugging Tips for Access 2007, VB, and VBA Basics for Building Access 2007 Runtime-Based Solutions Building SQL Statements that Include Variables and
Error Handling Vba Loop
Controls in Access 2007 Constructing Modern Time Elapsed Strings in Access 2007 Counting the Number of Working Days in Access 2007 Creating Managed Add-ins for Access 2007 Customizing the Office Fluent User Interface in Access 2007 Deploying Access 2007 Runtime-Based Solutions Developing Access 2007 Solutions with Native C or C++ Developer Considerations for Choosing File Formats in Access 2007 Error Handling and Debugging Tips for Access 2007, VB, and VBA error handling in vba excel Integrating Workflows into Access 2007 Applications Performance Tips To Speed Up Your Access 2007 Database Security Considerations and Guidance for Access 2007 Tips and Techniques for Queries in Access 2007 Transitioning Your Existing Access Applications to Access 2007 Using Excel Date Functions in Access 2007 Using SQL Server 2008 Table-valued Parameters in Access 2007 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. This documentation is archived and is not being maintained. Error Handling and Debugging Tips for Access 2007, VB, and VBA Office 2007 This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist. Summary: Experienced developers use a variety of techniques to simplify their coding and maintenance efforts. Some of the tricks are general programming styles and conventions, while others are specific to the characteristics of Microsoft Visual Basic 6.0 and Visual Basic for Applications (VBA). Hopefully, by adopting such "best practices" techniques, you'll be able to write code
a full version of Access, while a run-time version just crashes. For a more detailed approach to error handling, see FMS' error handling in vba macro article on Error Handling and Debugging. The simplest approach is to vba error handling best practices display the Access error message and quit the procedure. Each procedure, then, will have this format (without the vba error handling exit sub line numbers): 1 Sub|Function SomeName() 2 On Error GoTo Err_SomeName ' Initialize error handling. 3 ' Code to do something here. 4 Exit_SomeName: ' Label to resume after error. https://msdn.microsoft.com/en-us/library/ee358847(v=office.12).aspx 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 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 http://allenbrowne.com/ser-23a.html 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 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.
error condition is raised. If you have made provision for that possibility, your code can recover gracefully and continue or terminate as appropriate; if not, Access will do its best to handle http://datagnostics.com/dtips/vbaerrors.html the error itself -- 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 https://www.youtube.com/watch?v=6UIypRy1iE8 then dealt with by Access's default error-handling routine, which displays the description of the error and, depending on your option settings, may allow you to debug the code. But it also tends to reset the VBA project, error handling 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 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 error handling vba 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 there. Here's a very basic example of error-handling using "On Error GoTo", with comments on the essential elements: code: click in the frame, Select All, then Paste into your code editor Here's an example of in-line error-handling: code: click in the frame, Select All, then Paste into your code editor Note
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