Re: Web Forms filtered with SQL constraints

["Saphyr" <saphyr () infomaniak ch>]

> Hi,
> Using classic ASP with vbscript you would add this to the top of the page:
> <% on error resume next %>
> Then after every SQL query:
> <%
> if err then
> Response.write "There was a database error"
> ' Log to error to file
> end if
> %>

If I may interfere with this...

Using a 'On Error Resume Next' statement on the top of your scripts will
prevent you from being warned about many other errors you might encounter.

The pragmatic conception (my personal method :)= requirement used here
with this statement is:

    "For all errors found in this script, please ignore them."

However, this doesnt' solve the initial question which is "how to deal with
SQL errors". Considering this question, the P.C. requirement becomes:

    "When executing an SQL statement, I want to keep control over the
    script flow execution."

The answer is indeed the use of the 'On Error Resume Next' statement,
not at the script header but right before the SQL execution statement and
disabling this right after it. This provides error catching atomicity during
SQL executions:

--------------script.asp//start-------------------------------------
    ...some code...
    '* activate error catcher
    On Error Resume Next

    '* execute dangerous statement
    connDb.Execute(sqlQuery)

    '* deactivate error catcher
    On Error GoTo 0

    '* handle the error
    If(Err)Then
        ...
    End If
--------------script.asp//stop-------------------------------------

P.S. I recently began writing a draft about my development method, anyone
would be interested ?


--
Antonio FONTES
Team Web Intelligence
IS Security, Information and Knowledge Management

Cosadgip SA
http://www.cosadgip.com
129, rte de St-Julien
Case postale 135
CH-1228 Plan les Ouates
Switzerland
Tél.: +41 22 884 19 44
Fax:  +41 22 884 19 49