Asp Conn.execute Error Handling
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up using “on error resume next” in classic ASP, and how to handle errors up vote 6 down vote favorite Good day all, I would like to ask a thing about on error resume next let's assume we have a loop to navigate through a recordset like: Do while not rs.EOF query = "UPDATE ...." conn.execute(query) rs.movenext loop i would like to classic asp throw exception be sure the UPDATE is going good, and i would like to check if there is some problems, so I have put a debugging features in the code like: Do while not rs.EOF query = "UPDATE ...." on error resume next conn.execute(query) If Err.Number <> 0 Then Response.write(Err.Number) response.write("
") response.write(Err.description) response.write("
") response.write(query) response.write("
") end if on error goto 0 rs.movenext loop the question is : during a loop, if it encounters an error, the next cycle will the error be there (and so triggers again the error block) ? or on error goto 0 will clear the Err object? in other words, will it works as a error handling? asp-classic vbscript error-handling share|improve this question edited Jul 3 '13 at 10:51 Alex K. 106k16146194 asked Jul 3 '13 at 10:43 Matteo Bononi 'peorthyr' 76451749 add a comment| 3 Answers 3 active oldest votes up vote 5 down vote accepted VBScript resets the error on goto 0: on error resume next i = 1 / 0 WScript.echo( err.number ) '' prints 11 (div by 0) on error goto 0 WScript.echo( err.number ) '' prints 0 (no e
Forums Links DISCUSSIONARCHIVES DISCUSSIONARCHIVES2 DISCUSSIONARCHIVES3 BLOG We didn't realize the site was so popular. Other Stuff adodb.connection errors How To Use On Error Resume Next Often when using on error resume next vbscript ASP or Active Server Pages with VBScript you will find it necessary to check for errors when you on error goto -1 vbscript do certain things that may fail and then handle it accordingly. Things like opening a database connection or writing to a text file come to mind. Generally if an error http://stackoverflow.com/questions/17445890/using-on-error-resume-next-in-classic-asp-and-how-to-handle-errors is encountered in your .asp file, the processing of your script stops and an error message is returned to the browser. If you want to continue processing your page even if an error is encountered, include the following line at the beginning of your .asp file: <% On Error Resume Next %> That being said just ignoring errors in your code http://www.powerasp.net/content/new/on-error-resume-next.asp is not a very good idea. What you really want to do is handle the error in some way. The example below opens a database connection and shows you how to trap a potential error and do whatever you want because of it. In this case we are simply displaying the error. <% ConnectionString = "DBQ=c:\inetpub\wwwroot\mysite\data\mydatabase.mdb;Driver={Microsoft Access Driver (*.mdb)};" '*** This code checks the ConnectionString info you entered and reports back the error code if it is not ok Err.Clear On Error Resume Next Set ConnPasswords = Server.CreateObject("ADODB.Connection") ConnPasswords.Open ConnectionString If Err.Number <> 0 Then Response.Write (Err.Description& "
") Response.Write("This means there is most likely a problem with the" & vbCrLf) Response.Write("""ConnectionString"" info that you specified.
" & vbCrLf) Response.End End If On Error GoTo 0 %> We put the "On Error GoTo 0 at the end because that will essentially end the "on error resume next" That is something you want to do so any later errors in your application do not get ignored without you knowing about it. Below is another
Tutorials MSDN Communities Hub Official Docs Security Stump the SQL Guru! XML Info Information: Feedback Author an Article Published: Thursday, June 03, 1999 Error Handling in ASP You just finished http://www.4guysfromrolla.com/webtech/060399-1.shtml your ASP application in time, barely making the dealine! As you upload the final version to the webserver, you receive an email from your supervisor indicating that he's ready for your http://support.sas.com/documentation/cdl/en/oledbpr/59558/HTML/default/p0i32pkwpbtyxdn1dgew8ac953m5.htm demo. You confidently stride into his office and give him instructions on accesses the application through the Intranet. -continued- Your boss comes to the first page, and is asked to enter on error his name. You've created a slick, customized feel to the site, recording the user and his or her preferences in a database. Your boss types in his name, "The Pointy Haired Boss," and hits the submit button. Instead of being taken to the next page, he sees the following text pop up on the screen: Microsoft OLE DB Provider for ODBC Drivers error on error goto ' 80004005' [Microsoft][ODBC Access 97 ODBC driver Driver] syntax wrong near ' Please note that I just made this error message up, so, please, no emails asking about how one gets this error by entering his name! You get one of those looks from your boss, a look that says, "I hope you weren't expecting a positive performance review." There's nothing worse to an end user than to see those dreaded ADO errors. They are misformatted, cryptic, and leave the user wondering what they are suppose to do. Your average end user doesn't know ODBC from OLE. So how can you prevent these nasty error messages? First you must insert at the top of your ASP page:
<% On Error Resume Next %>This will tell ASP to just skip over any errors, instead of halting execution and printing out a nasty error message. You may be tempted to leave it at this, although if you do, and errors occur, your users won't be aware of them. They will think their information was correctly saved, when in actuality it wasn't due to an ADO er
errors are stored in the Errors Collection. To retrieve complete error information, you iterate through the Errors Collection and output the information. In most cases, the "Description" and "Number" properties of the Error object provide the most helpful information. The Visual Basic, VBScript, and Active Server Pages (ASP) examples all show how errors can be handled by using ADO. The VBScript and ASP examples perform the same tasks as the Visual Basic example, but there are language differences between them. When reviewing the sample code, keep the following differences in mind: An ASP file typically embeds VBScript and delimits the VBScript with <% and %>. VBScript does not predefine the ADO Enumerated Constants, so you must code them as constants. In VBScript, you should create objects by using the CreateObject syntax. VBScript usually provides different output than Visual Basic. Usually, Visual Basic programmers handle errors by using the On Error Goto syntax. However, this syntax is not supported by VBScript, so the VBScript and ASP examples use a subroutine to handle error output. Note: Although the examples use the Debug.Print and MsgBox methods to display error information, applications can use other methods such as Document.Write, or Response.Write. You can also write an application that traps errors instead of displaying error information. The following examples use the local provider to attempt to open a table named lostDataset. If lostDataset does not exist in the directory c:\testdata, then the application generates an error and outputs the error information. The "Description" property used in the examples is typically a string message that is composed by the SAS provider. However, it might also be a message from the server or some component that is used by the provider. The "Number" property is typically the HRESULT value that is returned by the underlying OLE DB interface method. In the examples, the value is output in hexadecimal because that is the way that it is typically written in the header files such as WinError.h and OleDBErr.h. Visual Basic Error Handling Sub Main() Dim obConnection As New ADODB.Connection Dim obRecordset As New ADODB.Recordset Dim errorObject As ADODB.Error On Error GoTo DisplayErrorInfo obConnection.Provider = "sas.LocalProvider" obConnection.Properties("Data Source") = "c:\testdata" obConnection.Open obRecordset.Open "lostDataset", obConnection, ad