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<?php
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/*
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* Helper functions for building a DataTables server-side processing SQL query
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*
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* The static functions in this class are just helper functions to help build
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* the SQL used in the DataTables demo server-side processing scripts. These
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* functions obviously do not represent all that can be done with server-side
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* processing, they are intentionally simple to show how it works. More complex
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* server-side processing operations will likely require a custom script.
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*
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* See http://datatables.net/usage/server-side for full details on the server-
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* side processing requirements of DataTables.
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*
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* @license MIT - http://datatables.net/license_mit
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* Modified by JAKWEB.ch to fit the medoo db class.
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* Modified for Version 2.0.4 and PHP 8.1 compatibility
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*/
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class SSP {
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/**
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* Create the data output array for the DataTables rows
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*
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* @param array $columns Column information array
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* @param array $data Data from the SQL get
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* @return array Formatted data in a row based format
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*/
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static function data_output ( $columns, $data )
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{
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$out = array();
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for ( $i=0, $ien=count($data) ; $i<$ien ; $i++ ) {
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$row = array();
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for ( $j=0, $jen=count($columns) ; $j<$jen ; $j++ ) {
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$column = $columns[$j];
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// Is there a formatter?
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if ( isset( $column['formatter'] ) ) {
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$row[ $column['dt'] ] = $column['formatter']( $data[$i][ $column['db'] ], $data[$i] );
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}
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else {
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$row[ $column['dt'] ] = $data[$i][ $columns[$j]['db'] ];
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}
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}
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$out[] = $row;
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}
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return $out;
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}
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static function data_output_join ( $columns, $data )
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{
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$out = array();
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for ( $i=0, $ien=count($data) ; $i<$ien ; $i++ ) {
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$row = array();
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for ( $j=0, $jen=count($columns) ; $j<$jen ; $j++ ) {
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$column = $columns[$j];
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// Is there a formatter?
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if ( isset( $column['formatter'] ) ) {
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$row[ $column['dt'] ] = $column['formatter']( $data[$i][ $column['dbjoin'] ], $data[$i] );
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}
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else {
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$row[ $column['dt'] ] = $data[$i][ $columns[$j]['dbjoin'] ];
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}
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}
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$out[] = $row;
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}
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return $out;
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}
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/**
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* Paging
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*
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* Construct the LIMIT clause for server-side processing SQL query
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*
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* @param array $request Data sent to server by DataTables
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* @param array $columns Column information array
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* @return string SQL limit clause
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*/
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static function limit ( $request, $columns )
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{
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$limit = '';
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if ( isset($request['start']) && $request['length'] != -1 ) {
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$limit = "LIMIT ".intval($request['start']).", ".intval($request['length']);
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}
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return $limit;
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}
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/**
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* Ordering
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*
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* Construct the ORDER BY clause for server-side processing SQL query
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*
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* @param array $request Data sent to server by DataTables
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* @param array $columns Column information array
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* @return string SQL order by clause
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*/
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static function order ( $request, $columns )
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{
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$order = '';
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if ( isset($request['order']) && count($request['order']) ) {
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$orderBy = array();
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$dtColumns = self::pluck( $columns, 'dt' );
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for ( $i=0, $ien=count($request['order']) ; $i<$ien ; $i++ ) {
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// Convert the column index into the column data property
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$columnIdx = intval($request['order'][$i]['column']);
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$requestColumn = $request['columns'][$columnIdx];
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$columnIdx = array_search( $requestColumn['data'], $dtColumns );
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$column = $columns[ $columnIdx ];
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if ( $requestColumn['orderable'] == 'true' ) {
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$dir = $request['order'][$i]['dir'] === 'asc' ?
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'ASC' :
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'DESC';
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$orderBy[] = $column['db'].' '.$dir;
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}
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}
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$order = 'ORDER BY '.implode(', ', $orderBy);
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}
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return $order;
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}
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/**
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* Searching / Filtering
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*
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* Construct the WHERE clause for server-side processing SQL query.
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*
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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 performance on large
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* databases would be very poor
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*
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* @param array $request Data sent to server by DataTables
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* @param array $columns Column information array
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* @param array $bindings Array of values for PDO bindings, used in the
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* sql_exec() function
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* @return string SQL where clause
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*/
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static function filter ( $request, $columns, &$bindings )
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{
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$globalSearch = array();
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$columnSearch = array();
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$dtColumns = self::pluck( $columns, 'dt' );
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if ( isset($request['search']) && $request['search']['value'] != '' ) {
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$str = $request['search']['value'];
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for ( $i=0, $ien=count($request['columns']) ; $i<$ien ; $i++ ) {
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$requestColumn = $request['columns'][$i];
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$columnIdx = array_search( $requestColumn['data'], $dtColumns );
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$column = $columns[ $columnIdx ];
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if ( $requestColumn['searchable'] == 'true' ) {
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$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
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$globalSearch[] = $column['db']." LIKE ".$binding;
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}
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}
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}
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// Individual column filtering
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if ( isset( $request['columns'] ) ) {
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for ( $i=0, $ien=count($request['columns']) ; $i<$ien ; $i++ ) {
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$requestColumn = $request['columns'][$i];
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$columnIdx = array_search( $requestColumn['data'], $dtColumns );
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$column = $columns[ $columnIdx ];
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$str = $requestColumn['search']['value'];
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if ( $requestColumn['searchable'] == 'true' &&
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$str != '' ) {
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$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
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$columnSearch[] = $column['db']." LIKE ".$binding;
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}
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}
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}
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// Combine the filters into a single string
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$where = '';
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if ( count( $globalSearch ) ) {
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$where = '('.implode(' OR ', $globalSearch).')';
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}
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if ( count( $columnSearch ) ) {
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$where = $where === '' ?
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implode(' AND ', $columnSearch) :
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$where .' AND '. implode(' AND ', $columnSearch);
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}
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if ( $where !== '' ) {
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$where = 'WHERE '.$where;
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}
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return $where;
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}
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/* Run the simple query */
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static function simple ( $request, $table, $primaryKey, $columns, $whereResult )
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{
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$bindings = array();
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global $jakdb;
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// Build the SQL query string from the request
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$limit = self::limit( $request, $columns );
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$order = self::order( $request, $columns );
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$where = self::filter( $request, $columns, $bindings );
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if ( $whereResult ) {
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$where = $where ?
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$where .' AND '.$whereResult :
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'WHERE '.$whereResult;
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}
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// Main query to actually get the data
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$data = $jakdb->sql_exec( $bindings,
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"SELECT ".implode(", ", self::pluck($columns, 'db'))."
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FROM $table
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$where
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$order
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$limit"
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);
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// Data set length after filtering
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$resFilterLength = $jakdb->sql_exec( $bindings,
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"SELECT COUNT({$primaryKey})
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FROM $table
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$where"
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);
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$recordsFiltered = $resFilterLength[0][0];
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// Total data set length
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$resTotalLength = $jakdb->sql_exec(
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"SELECT COUNT({$primaryKey})
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FROM $table"
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);
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$recordsTotal = $resTotalLength[0][0];
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/*
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* Output
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*/
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return array(
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"draw" => isset ( $request['draw'] ) ?
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intval( $request['draw'] ) :
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0,
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"recordsTotal" => intval( $recordsTotal ),
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"recordsFiltered" => intval( $recordsFiltered ),
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"data" => self::data_output( $columns, $data )
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);
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}
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/* Run the query, quite heavy with joins */
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static function join ( $request, $table, $table2, $table3, $primaryKey, $columns, $whereResult=null, $whereAll=null )
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{
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$bindings = array();
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$whereAllSql = '';
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global $jakdb;
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// Build the SQL query string from the request
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$limit = self::limit( $request, $columns );
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$order = self::order( $request, $columns );
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$where = self::filter( $request, $columns, $bindings );
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$whereResult = self::_flatten( $whereResult );
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$whereAll = self::_flatten( $whereAll );
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if ( $whereResult ) {
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$where = $where ?
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$where .' AND '.$whereResult :
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'WHERE '.$whereResult;
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}
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if ( $whereAll ) {
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$where = $where ?
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$where .' AND '.$whereAll :
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'WHERE '.$whereAll;
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$whereAllSql = 'WHERE '.$whereAll;
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}
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// Main query to actually get the data
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$data = $jakdb->sql_exec( $bindings,
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"SELECT ".implode(", ", self::pluck($columns, 'db'))."
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FROM $table$table2$table3
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$where
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$order
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$limit"
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);
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// Data set length after filtering
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$resFilterLength = $jakdb->sql_exec( $bindings,
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"SELECT COUNT({$primaryKey})
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FROM $table$table2$table3
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$where"
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);
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$recordsFiltered = $resFilterLength[0][0];
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// Total data set length
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$resTotalLength = $jakdb->sql_exec(
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"SELECT COUNT({$primaryKey})
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FROM $table$table2$table3".
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$whereAllSql
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);
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$recordsTotal = $resTotalLength[0][0];
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/*
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* Output
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*/
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return array(
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"draw" => isset ( $request['draw'] ) ?
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intval( $request['draw'] ) :
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0,
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"recordsTotal" => intval( $recordsTotal ),
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"recordsFiltered" => intval( $recordsFiltered ),
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"data" => self::data_output_join( $columns, $data )
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);
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}
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Internal methods
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*/
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/**
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* Create a PDO binding key which can be used for escaping variables safely
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* when executing a query with sql_exec()
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*
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* @param array &$a Array of bindings
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* @param * $val Value to bind
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* @param int $type PDO field type
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* @return string Bound key to be used in the SQL where this parameter
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* would be used.
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*/
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static function bind ( &$a, $val, $type )
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{
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$key = ':binding_'.count( $a );
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$a[] = array(
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'key' => $key,
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'val' => $val,
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'type' => $type
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);
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return $key;
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}
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/**
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* Pull a particular property from each assoc. array in a numeric array,
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* returning and array of the property values from each item.
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*
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* @param array $a Array to get data from
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* @param string $prop Property to read
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* @return array Array of property values
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*/
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static function pluck ( $a, $prop )
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{
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$out = array();
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for ( $i=0, $len=count($a) ; $i<$len ; $i++ ) {
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$out[] = $a[$i][$prop];
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}
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return $out;
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}
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/**
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* Return a string from an array or a string
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*
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* @param array|string $a Array to join
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* @param string $join Glue for the concatenation
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* @return string Joined string
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*/
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static function _flatten ( $a, $join = ' AND ' )
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{
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if ( ! $a ) {
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return '';
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}
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else if ( $a && is_array($a) ) {
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return implode( $join, $a );
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}
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return $a;
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}
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}
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?>
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