datatable serverside script

/* Paging */
        $sLimit = "";
        if ( isset( $_POST['iDisplayStart'] ) )
        {
                $sLimit = " LIMIT ".mysql_real_escape_string( $_POST['iDisplayStart'] ).", ".
                        mysql_real_escape_string( $_POST['iDisplayLength'] );
        }


        $sOrder ="";
        if ( isset( $_POST['iSortCol_0'] ) )
        {
                $sOrder = "ORDER BY Date, A.Line";
                 }

$sWhere = "";
//      if ( $_POST['sSearch'] != "" )
        if (postVar('sSearch') !="" )
        {
                $sWhere = " WHERE (A.Inspection_datetime LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%' OR
                                A.Line LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%' OR ".
                               " A.Model LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%' OR ".
                               " A.Lot_no LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%' OR ".
                               " A.Range_sampling LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%' OR ".
//                             " A.Serial_number LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%' OR ".
                               " B.name LIKE '%".mysql_real_escape_string( $_POST['sSearch'] )."%') ";
        }

$sGroupBy = " GROUP BY A.Range_sampling, A.Lot_no ";
                $sQuery = "SELECT DATE(A.Inspection_datetime) AS Date, A.Line, A.Model,
                                  A.Lot_no,A.Range_sampling,COUNT(A.Serial_number) AS Error,B.name AS PIC
                           FROM inspection_report A
                           LEFT JOIN Employee B
                           ON A.NIK=B.NIK
                           WHERE CHAR_LENGTH( A.Range_sampling ) < 17
                           AND MONTH(A.Inspection_datetime)=MONTH(CURRENT_DATE)" .$sWhere.$sGroupBy.$sOrder.$sLimit;
        $rResult = mysql_query( $sQuery) or _doError(_ERROR30 . ' (<small>' . htmlspecialchars($sql) . '</small>): ' . mysql_error() );  // submit SQL to MySQL and err$

        $sQuery = "SELECT FOUND_ROWS()";
        $rResultFilterTotal = mysql_query( $sQuery) or _doError(_ERROR30 . ' (<small>' . htmlspecialchars($sql) . '</small>): ' . mysql_error() );  // submit SQL to My$
        $aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
        $iFilteredTotal = $aResultFilterTotal[0];

        $sQuery = "SELECT COUNT(Line) FROM   inspection_report";

        $rResultTotal = mysql_query( $sQuery) or _doError(_ERROR30 . ' (<small>' . htmlspecialchars($sql) . '</small>): ' . mysql_error() );  // submit SQL to MySQL an$
        $aResultTotal = mysql_fetch_array($rResultTotal);
        $iTotal = $aResultTotal[0];

$sOutput = '{';
        $sOutput .= '"sEcho": '.intval($_POST['sEcho']).',';     //   '.intval($_POST['sEcho']).', ';
        $sOutput .= '"iTotalRecords": '.$iTotal.', ';
//      $sOutput .= '"iTotalDisplayRecords": '.$iFilteredTotal.', \';
        $sOutput .= '"iTotalDisplayRecords": '.$iTotal.', ';
        $sOutput .= '"aaData": [ ';
        while ( $aRow = mysql_fetch_array( $rResult ) )
        {
                $sOutput .= "[";
                $sOutput .= '"'.addslashes($aRow['Date']).'",';
                $sOutput .= '"'.addslashes($aRow['Line']).'",';
                $sOutput .= '"'.addslashes($aRow['Model']).'",';
                $sOutput .= '"'.addslashes($aRow['Lot_no']).'",';
                $sOutput .= '"'.addslashes($aRow['Range_sampling']).'",';
                $sOutput .= '"'.addslashes($aRow['Error']).'",';
                $sOutput .= '"'.addslashes($aRow['PIC']).'"';
                $sOutput .= "],";
        }
        $sOutput = substr_replace( $sOutput, "", -1 );
        $sOutput .= '] }';

        echo $sOutput;

function fnColumnToField( $i )
        {
                if ( $i == 0 )
                        return "Date";
                else if ( $i == 1 )
                        return "Line";
                else if ( $i == 2 )
                        return "Model";
                else if ( $i == 3 )
                        return "Lot_no";
                else if ( $i == 4 )
                        return "Range_sampling";
                else if ( $i == 5 )
                        return "Error";
                else if ( $i == 6 )
                        return "PIC";
        }