probleme with querybyattributes

[fx gamoy]

Hello everybody,
i am getting problems with querybyattributes
I use a self-compiled php/mapscript 4.2.4 (--with-regex=system) on a linux mandrake box.

Querybyattributes works fine using integer on a point type layer.

When i try to do the same using a line layer, mapserver return me the whole lines of the layer instead of only the selected ones.

  $oLayer = $oMapSession->oMap->getLayerByName( 'listvoies' ); // (listvoies with template "something")
  $dblquery = "([CODE_VOIE] = ".$_SESSION["index"].")";  //CODE_VOIE is integer
  $fieldname= "CODE_VOIE";
 if (@$oLayer->queryByAttributes($fieldname, $dblquery, MS_MULTIPLE) == MS_SUCCESS)
 {
 $oLayer->open();
 $nbrep=$oLayer->getNumResults();
 echo $nbrep; //return 1200 that's to say the whole file
 }//if
  What is wrong?
i've tried many way to exprim $dblquery but i get still the same issue.
The same use of querybyattributes works fine when i use a point type layer...

Any help wil be appreciated.
thanks
fx

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