PHP und MySQL SQL-Fehler ausgeben

$Str_SQL = 'Insert into kunde (';
         $Str_SQL = $Str_SQL . 'kunden_id,vermittler_id,anrede,vorname,';
         $Str_SQL = $Str_SQL . 'nachname,firma,rechtsform,strasse,plz,';
         $Str_SQL = $Str_SQL . 'ort,land,telefon,fax,email,handy,last_kunden_import_am,';
         $Str_SQL = $Str_SQL . 'last_kunden_import_um,last_kunden_import_von) values (';

         $Str_SQL = $Str_SQL . "'" . $zeilen_array[1 - 1] . "',"; //kunden_id
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[2 - 1] . "',"; //vermittler_id
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[4 - 1] . "',"; //anrede
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[6 - 1] . "',"; //vorname
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[5 - 1] . "',"; //nachname
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[9 - 1] . "',"; //firma
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[10 - 1] . "',"; //rechtsform
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[11 - 1] . "',"; //strasse
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[13 - 1] . "',"; //plz
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[14 - 1] . "',"; //ort
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[12 - 1] . "',"; //land
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[15 - 1] . "',"; //telefon
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[17 - 1] . "',"; //fax
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[18 - 1] . "',"; //email
         $Str_SQL = $Str_SQL . "'" . $zeilen_array[16 - 1] . "',"; //handy
         $Str_SQL = $Str_SQL . "'" . date("d.m.Y") . "',";
         $Str_SQL = $Str_SQL . "'" . date("H:i:s") . "',";
         $Str_SQL = $Str_SQL . "'" . $REMOTE_ADDR . "');";

         $rs_query = mysql_query($Str_SQL);

         if (!rs_query){
             log_import('ERROR', 'SQL konnte nicht ausgeführt werden: ' . $Str_SQL, $REMOTE_ADDR, $SCRIPT_NAME);
             $import_ok = FALSE;
             }
        else
            {$import_counter += 1;}

$Str_SQL .= 'kunden_id,vermittler_id,anrede,vorname,';