Asp Classic Error Handling
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ASP or Active Server Pages with VBScript you will find it necessary to check asp error number for errors when you do certain things that may fail and then handle it accordingly. Things like opening a database connection or classic asp throw exception writing to a text file come to mind. Generally if an error is encountered in your .asp file, the processing of your script stops and an error message is returned to the browser. If you want http://www.codeguru.com/csharp/.net/net_general/debugginganderrorhandling/article.php/c19557/ASP-and-the-Error-Handler.htm 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 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 http://www.powerasp.net/content/new/on-error-resume-next.asp 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 example. In this example our application logs user info in a text file when they sign in to a site. We add "On Error Resume Next" here simply so no nasty error message come up if by chance write permissions to the text file do not exist. <% Set ObjMyFile = CreateObject("Scripting.FileSystemObject") Err.Clear On Error Resume Next LogFileName = "aspprotect.log" LogFileDirectory = "c:\somedirectory" 'Open Text File.. If doesn't exist create it an
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visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Results 1 to 4 of 4 Thread: ASP: Try and Catch Tweet Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Jun 26th, 2006,01:50 AM #1 Winder View Profile View Forum Posts Thread Starter Lively Member Join Date Apr 2006 Posts 108 ASP: Try and Catch Is there any examples on using Try and Catch statement in ASP?? Reply With Quote Jun 26th, 2006,02:07 AM #2 rory View Profile View Forum Posts PowerPoster Join Date May 2006 Posts 2,988 Re: ASP: Try and Catch what are you trying to do with them ..? edit: these are .Net stuff?? Anyway, if its error handling its basically .. On Error Resume Next '// ERROR CHECKING If err <> 0 Then '// ERROR OCCURRED On Error Goto 0 '// Clear Errors On Error Resume Next '// NEW ERROR CHECKING Last edited by rory; Jun 26th, 2006 at 02:11 AM. Reply With Quote Jun 26th, 2006,03:04 AM #3 Winder View Profile View Forum Posts Thread Starter Lively Member Join Date Apr 2006 Posts 108 Re: ASP: Try and Catch I want to use Try and Catch to catch the error in my ASP code. Im trying to insert and update data into Access database. I want the program to throw exception instead of displaying the error page. Here's my code: <% Dim adoCon Dim rs Dim strSQL Set adoCon = Server.CreateObject("ADODB.Connection") 'Set an active connection to the Connection object using a DSN-less connection adoCon.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath("db1.mdb") 'Set an active connection to the Connection object using DSN connection 'adoCon.Open "DSN=guestbook" 'Create an ADO recordset object Set rs = Server.CreateObject("ADODB.Recordset") 'Open the recordset with the SQL query rs.Open strSQL, adoCon %> The connection code all work correctly except for the javascript. It will show error when I submit data. Maybe is th