how to do the filter function on server side

I want to implement the filter function on server side, so can't use datatable filter, and I need get the data again, and refresh the datable, so who can help me!!

$('#aaaa').on( 'click', function () {



                         var oSettings = oTable.fnSettings();
                        oSettings.sAjaxSource = "anotherdatasource";
                        alert(oSettings.sAjaxSource);
                        oTable.fnClearTable(0);
                        oTable.fnDraw();}