Refactor code structure for improved readability and maintainability
This commit is contained in:
203
modules/lib/datatables/server_side.php
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203
modules/lib/datatables/server_side.php
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<?php
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Easy set variables
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*/
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/* Array of database columns which should be read and sent back to DataTables. Use a space where
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* you want to insert a non-database field (for example a counter or static image)
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*/
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$aColumns = array( 'engine', 'browser', 'platform', 'version', 'grade' );
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/* Indexed column (used for fast and accurate table cardinality) */
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$sIndexColumn = "id";
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/* DB table to use */
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$sTable = "ajax";
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/* Database connection information */
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$gaSql['user'] = "";
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$gaSql['password'] = "";
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$gaSql['db'] = "";
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$gaSql['server'] = "localhost";
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* If you just want to use the basic configuration for DataTables with PHP server-side, there is
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* no need to edit below this line
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*/
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/*
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* MySQL connection
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*/
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$gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password'] ) or
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die( 'Could not open connection to server' );
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mysql_select_db( $gaSql['db'], $gaSql['link'] ) or
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die( 'Could not select database '. $gaSql['db'] );
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/*
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* Paging
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*/
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$sLimit = "";
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if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
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{
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$sLimit = "LIMIT ".mysql_real_escape_string( $_GET['iDisplayStart'] ).", ".
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mysql_real_escape_string( $_GET['iDisplayLength'] );
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}
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/*
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* Ordering
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*/
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$sOrder = "";
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if ( isset( $_GET['iSortCol_0'] ) )
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{
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$sOrder = "ORDER BY ";
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for ( $i=0 ; $i<intval( $_GET['iSortingCols'] ) ; $i++ )
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{
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if ( $_GET[ 'bSortable_'.intval($_GET['iSortCol_'.$i]) ] == "true" )
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{
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$sOrder .= $aColumns[ intval( $_GET['iSortCol_'.$i] )-1 ]."
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".mysql_real_escape_string( $_GET['sSortDir_'.$i] ) .", ";
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}
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}
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$sOrder = substr_replace( $sOrder, "", -2 );
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if ( $sOrder == "ORDER BY" )
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{
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$sOrder = "";
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}
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}
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/*
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* Filtering
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* NOTE this does not match the built-in DataTables filtering which does it
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* word by word on any field. It's possible to do here, but concerned about efficiency
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* on very large tables, and MySQL's regex functionality is very limited
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*/
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$sWhere = "";
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if ( $_GET['sSearch'] != "" )
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{
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$sWhere = "(";
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$aWords = preg_split('/\s+/', $_GET['sSearch']);
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for ( $j=0 ; $j<count($aWords) ; $j++ )
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{
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if ( $aWords[$j] != "" )
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{
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$sWhere .= "(";
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for ( $i=0 ; $i<count($aColumns) ; $i++ )
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{
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$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $aWords[$j] )."%' OR ";
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}
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$sWhere = substr_replace( $sWhere, "", -3 );
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$sWhere .= ") AND ";
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}
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}
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$sWhere = substr_replace( $sWhere, "", -5 );
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$sWhere .= ")";
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}
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/* Individual column filtering */
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$sColumnWhere = "";
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for ( $i=0 ; $i<count($aColumns) ; $i++ )
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{
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if ( $_GET['sSearch_'.$i] != "" )
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{
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$aWords = preg_split('/\s+/', $_GET['sSearch_'.$i]);
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$sColumnWhere .= "(";
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for ( $j=0 ; $j<count($aWords) ; $j++ )
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{
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if ( $aWords[$j] != "" )
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{
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$sColumnWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $aWords[$j] )."%' OR ";
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}
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}
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$sColumnWhere = substr_replace( $sColumnWhere, "", -3 );
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$sColumnWhere .= ") AND ";
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}
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}
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if ( $sColumnWhere != "" ) {
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$sColumnWhere = substr_replace( $sColumnWhere, "", -5 );
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if ( $sWhere == "" ) {
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$sWhere = $sColumnWhere;
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} else {
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$sWhere .= " AND ".$sColumnWhere;
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}
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}
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if ( $sWhere != "" )
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{
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$sWhere = "WHERE ".$sWhere;
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}
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/*
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* SQL queries
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* Get data to display
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*/
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$sQuery = "
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SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
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FROM $sTable
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$sWhere
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$sOrder
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$sLimit
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";
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$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
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/* Data set length after filtering */
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$sQuery = "
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SELECT FOUND_ROWS()
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";
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$rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
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$aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
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$iFilteredTotal = $aResultFilterTotal[0];
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/* Total data set length */
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$sQuery = "
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SELECT COUNT(".$sIndexColumn.")
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FROM $sTable
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";
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$rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
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$aResultTotal = mysql_fetch_array($rResultTotal);
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$iTotal = $aResultTotal[0];
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/*
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* Output
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*/
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$output = array(
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"sEcho" => intval($_GET['sEcho']),
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"iTotalRecords" => $iTotal,
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"iTotalDisplayRecords" => $iFilteredTotal,
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"aaData" => array()
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);
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while ( $aRow = mysql_fetch_array( $rResult ) )
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{
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$row = array();
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/* Add the details image at the start of the display array */
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$row[] = '<img src="img/details_open.png">';
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for ( $i=0 ; $i<count($aColumns) ; $i++ )
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{
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if ( $aColumns[$i] == "version" )
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{
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/* Special output formatting for 'version' column */
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$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
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}
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else if ( $aColumns[$i] != ' ' )
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{
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/* General output */
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$row[] = $aRow[ $aColumns[$i] ];
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}
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}
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$row['extra'] = 'hrmll';
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$output['aaData'][] = $row;
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}
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echo json_encode( $output );
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?>
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