Laravel BatchUpdate DB Query

LaravelBatchUpdateDB

//http://stackoverflow.com/questions/26133977/laravel-bulk-update
    public function updateBatch($tableName = "", $multipleData = array()){

        if( $tableName && !empty($multipleData) ) {

            // column or fields to update
            //var_dump($multipleData);
            $updateColumn = array_keys($multipleData[0]);
            //var_dump($updateColumn);

            $referenceColumn = $updateColumn[0]; //e.g id
            unset($updateColumn[0]);
            $whereIn = "";

            $q = "UPDATE ".$tableName." SET ";
            foreach ( $updateColumn as $uColumn ) {
                $q .=  $uColumn." = CASE ";

                foreach( $multipleData as $data ) {
                    $q .= "WHEN ".$referenceColumn." = '".$data[$referenceColumn]."' THEN '".$data[$uColumn]."' ";

                }
                $q .= "ELSE ".$uColumn." END, ";
            }
            foreach( $multipleData as $data ) {
                $whereIn .= "'".$data[$referenceColumn]."', ";
            }
            $whereIn = rtrim($whereIn, ', ');
            $q = rtrim($q, ", ")." WHERE ".$referenceColumn." IN (".  rtrim($whereIn, ' ').")";

            // Update
            //echo $q;
            //die;

            return \DB::update(\DB::raw($q));

        } else {
            return false;
        }
    }