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Chann

how to catch error when database query failed?

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Chann

I'm making a accdb query in this function.

Func Get_meaning($adoRs1,$adoCon1,$word1)
$query = "select Sinhala from words where English='"&$word1&"'"
$adoRs1.Open($query, $adoCon1)
$word=$adoRs1.Fields("Sinhala").Value
$adoRs1.Close 
return $word
EndFunc
 
 
When the $word1 is not in the database, i want to do some modification to the $word1 and recheck in the database. But when the $word1 is not found in the database, script gives an error and exit. Please give me some help
Edited by Chann

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jchd

Welcome to the forum.

Try this:

Func Get_meaning($adoRs1, $adoCon1, $word1)
    Local $word
    Local $query = "select Sinhala from words where English = " & _String_Escape($word1)
    $adoRs1.Open($query, $adoCon1)
    If Not $adoRs1.EOF Then
        $word = $adoRs1.Fields(0).Value
        $adoRs1.Close
    Else
        $adoRs1.Close
        ; from here try again with something different
    EndIf
    Return $word
EndFunc   ;==>Get_meaning

Func _String_Escape($sString)
    If IsNumber($sString) Then $sString = String($sString) ; don't raise error if passing a numeric parameter
    If Not IsString($sString) Then Return SetError(1, 0, "")
    Return ("'" & StringReplace($sString, "'", "''", 0, 1) & "'")
EndFunc   ;==>_String_Escape

Please use code tags (the blue square icon in editor) around code next time.


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Chann

Thank you jchd for your nice answer and for the advice.

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water

Another good idea when working with COM is to add a COM error handler. Please have a look at ObjEvent for an example.

In the 3.3.9.x version a script no longer crashes when a COM error occurres but simply continues. So you need to add error checking to your script to handle such errors.

Like:

$adoRs1.Open($query, $adoCon1)
If @error Then ...

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jchd

A COM error handler is always a good idea, well, until the beta turns into a release and COM errors become @error non-fatal events.

Notice however that a COM error handler will not help in this case: an SQL query returning an empty set is not an error.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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