2013-10-16 13:13:30 +02:00
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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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*/
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2014-01-21 09:20:03 +01:00
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// REMOVE THIS BLOCK - used for DataTables test environment only!
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$file = $_SERVER['DOCUMENT_ROOT'].'/datatables/mysql.php';
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if ( is_file( $file ) ) {
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include( $file );
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}
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2013-10-16 13:13:30 +02:00
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class SSP {
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2013-12-11 13:04:58 +01:00
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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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2015-01-11 17:26:59 +01:00
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/**
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* Database connection
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*
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* Obtain an PHP PDO connection from a connection details array
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*
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* @param array $conn SQL connection details. The array should have
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* the following properties
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* * host - host name
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* * db - database name
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* * user - user name
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* * pass - user password
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* @return resource PDO connection
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*/
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static function db ( $conn )
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{
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if ( is_array( $conn ) ) {
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return self::sql_connect( $conn );
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}
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return $conn;
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}
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2013-10-16 13:13:30 +02:00
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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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2013-11-12 20:18:51 +01:00
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if ( isset($request['order']) && count($request['order']) ) {
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2013-10-16 13:13:30 +02:00
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$orderBy = array();
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2014-06-23 16:35:54 +02:00
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$dtColumns = self::pluck( $columns, 'dt' );
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2013-10-16 13:13:30 +02:00
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2013-11-12 20:18:51 +01:00
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for ( $i=0, $ien=count($request['order']) ; $i<$ien ; $i++ ) {
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2013-10-16 13:13:30 +02:00
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// Convert the column index into the column data property
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2013-11-12 20:18:51 +01:00
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$columnIdx = intval($request['order'][$i]['column']);
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2013-10-16 13:13:30 +02:00
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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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2013-11-12 20:18:51 +01:00
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if ( $requestColumn['orderable'] == 'true' ) {
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$dir = $request['order'][$i]['dir'] === 'asc' ?
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2013-10-16 13:13:30 +02:00
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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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2013-11-12 20:18:51 +01:00
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* Searching / Filtering
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2013-10-16 13:13:30 +02:00
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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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2013-11-12 20:18:51 +01:00
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$globalSearch = array();
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$columnSearch = array();
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2014-06-23 16:35:54 +02:00
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$dtColumns = self::pluck( $columns, 'dt' );
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2013-10-16 13:13:30 +02:00
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2013-11-12 20:18:51 +01:00
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if ( isset($request['search']) && $request['search']['value'] != '' ) {
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$str = $request['search']['value'];
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2013-10-16 13:13:30 +02:00
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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 ( $requestColumn['searchable'] == 'true' ) {
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2014-06-23 16:35:54 +02:00
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$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
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2013-11-12 20:18:51 +01:00
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$globalSearch[] = "`".$column['db']."` LIKE ".$binding;
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2013-10-16 13:13:30 +02:00
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}
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}
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}
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// Individual column filtering
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2015-10-13 16:28:14 +02:00
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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[ $columnIdx ];
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2013-10-16 13:13:30 +02:00
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2015-10-13 16:28:14 +02:00
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$str = $requestColumn['search']['value'];
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2013-10-16 13:13:30 +02:00
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2015-10-13 16:28:14 +02:00
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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 ".$binding;
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}
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2013-10-16 13:13:30 +02:00
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}
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}
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// Combine the filters into a single string
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$where = '';
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2013-11-12 20:18:51 +01:00
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if ( count( $globalSearch ) ) {
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$where = '('.implode(' OR ', $globalSearch).')';
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2013-10-16 13:13:30 +02:00
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}
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2013-11-12 20:18:51 +01:00
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if ( count( $columnSearch ) ) {
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2013-10-16 13:13:30 +02:00
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$where = $where === '' ?
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2014-03-19 11:53:33 +01:00
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implode(' AND ', $columnSearch) :
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$where .' AND '. implode(' AND ', $columnSearch);
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2013-10-16 13:13:30 +02:00
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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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2013-12-11 13:04:58 +01:00
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/**
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* Perform the SQL queries needed for an server-side processing requested,
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* utilising the helper functions of this class, limit(), order() and
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* filter() among others. The returned array is ready to be encoded as JSON
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* in response to an SSP request, or can be modified if needed before
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* sending back to the client.
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*
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* @param array $request Data sent to server by DataTables
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2015-01-11 17:26:59 +01:00
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* @param array|PDO $conn PDO connection resource or connection parameters array
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2013-12-11 13:04:58 +01:00
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* @param string $table SQL table to query
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* @param string $primaryKey Primary key of the table
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* @param array $columns Column information array
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* @return array Server-side processing response array
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*/
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2015-01-11 17:26:59 +01:00
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static function simple ( $request, $conn, $table, $primaryKey, $columns )
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2013-12-11 13:04:58 +01:00
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{
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$bindings = array();
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2015-01-11 17:26:59 +01:00
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$db = self::db( $conn );
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2013-12-11 13:04:58 +01:00
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// Build the SQL query string from the request
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2014-06-23 16:35:54 +02:00
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$limit = self::limit( $request, $columns );
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$order = self::order( $request, $columns );
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$where = self::filter( $request, $columns, $bindings );
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2013-12-11 13:04:58 +01:00
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// Main query to actually get the data
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2014-06-23 16:35:54 +02:00
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$data = self::sql_exec( $db, $bindings,
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2016-12-02 17:46:11 +01:00
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"SELECT SQL_CALC_FOUND_ROWS `".implode("`, `", self::pluck($columns, 'db'))."`
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2013-12-11 13:04:58 +01:00
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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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2016-12-02 17:46:11 +01:00
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$resFilterLength = self::sql_exec( $db,
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"SELECT FOUND_ROWS()"
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2013-12-11 13:04:58 +01:00
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);
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$recordsFiltered = $resFilterLength[0][0];
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// Total data set length
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2014-06-23 16:35:54 +02:00
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$resTotalLength = self::sql_exec( $db,
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2013-12-11 13:04:58 +01:00
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"SELECT COUNT(`{$primaryKey}`)
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FROM `$table`"
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);
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$recordsTotal = $resTotalLength[0][0];
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2016-12-02 17:46:11 +01:00
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2013-12-11 13:04:58 +01:00
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/*
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* Output
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*/
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return array(
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2015-10-13 16:28:14 +02:00
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"draw" => isset ( $request['draw'] ) ?
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intval( $request['draw'] ) :
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0,
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2013-12-11 13:04:58 +01:00
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"recordsTotal" => intval( $recordsTotal ),
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"recordsFiltered" => intval( $recordsFiltered ),
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2014-06-23 16:35:54 +02:00
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"data" => self::data_output( $columns, $data )
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2013-12-11 13:04:58 +01:00
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);
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}
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2015-01-11 17:26:59 +01:00
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/**
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* The difference between this method and the `simple` one, is that you can
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* apply additional `where` conditions to the SQL queries. These can be in
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* one of two forms:
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*
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* * 'Result condition' - This is applied to the result set, but not the
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* overall paging information query - i.e. it will not effect the number
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* of records that a user sees they can have access to. This should be
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* used when you want apply a filtering condition that the user has sent.
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* * 'All condition' - This is applied to all queries that are made and
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* reduces the number of records that the user can access. This should be
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* used in conditions where you don't want the user to ever have access to
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* particular records (for example, restricting by a login id).
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*
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* @param array $request Data sent to server by DataTables
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* @param array|PDO $conn PDO connection resource or connection parameters array
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* @param string $table SQL table to query
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* @param string $primaryKey Primary key of the table
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* @param array $columns Column information array
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* @param string $whereResult WHERE condition to apply to the result set
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* @param string $whereAll WHERE condition to apply to all queries
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* @return array Server-side processing response array
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*/
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static function complex ( $request, $conn, $table, $primaryKey, $columns, $whereResult=null, $whereAll=null )
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{
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$bindings = array();
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$db = self::db( $conn );
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$localWhereResult = array();
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$localWhereAll = array();
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$whereAllSql = '';
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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 = self::sql_exec( $db, $bindings,
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2016-12-02 17:46:11 +01:00
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"SELECT SQL_CALC_FOUND_ROWS `".implode("`, `", self::pluck($columns, 'db'))."`
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2015-01-11 17:26:59 +01:00
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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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|
);
|
|
|
|
|
|
|
|
// Data set length after filtering
|
2016-12-02 17:46:11 +01:00
|
|
|
$resFilterLength = self::sql_exec( $db,
|
|
|
|
"SELECT FOUND_ROWS()"
|
2015-01-11 17:26:59 +01:00
|
|
|
);
|
|
|
|
$recordsFiltered = $resFilterLength[0][0];
|
|
|
|
|
|
|
|
// Total data set length
|
|
|
|
$resTotalLength = self::sql_exec( $db, $bindings,
|
|
|
|
"SELECT COUNT(`{$primaryKey}`)
|
|
|
|
FROM `$table` ".
|
|
|
|
$whereAllSql
|
|
|
|
);
|
|
|
|
$recordsTotal = $resTotalLength[0][0];
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Output
|
|
|
|
*/
|
|
|
|
return array(
|
2015-10-13 16:28:14 +02:00
|
|
|
"draw" => isset ( $request['draw'] ) ?
|
|
|
|
intval( $request['draw'] ) :
|
|
|
|
0,
|
2015-01-11 17:26:59 +01:00
|
|
|
"recordsTotal" => intval( $recordsTotal ),
|
|
|
|
"recordsFiltered" => intval( $recordsFiltered ),
|
|
|
|
"data" => self::data_output( $columns, $data )
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2013-10-16 13:13:30 +02:00
|
|
|
/**
|
|
|
|
* Connect to the database
|
|
|
|
*
|
|
|
|
* @param array $sql_details SQL server connection details array, with the
|
|
|
|
* properties:
|
|
|
|
* * host - host name
|
|
|
|
* * db - database name
|
|
|
|
* * user - user name
|
|
|
|
* * pass - user password
|
|
|
|
* @return resource Database connection handle
|
|
|
|
*/
|
|
|
|
static function sql_connect ( $sql_details )
|
|
|
|
{
|
|
|
|
try {
|
|
|
|
$db = @new PDO(
|
|
|
|
"mysql:host={$sql_details['host']};dbname={$sql_details['db']}",
|
|
|
|
$sql_details['user'],
|
|
|
|
$sql_details['pass'],
|
|
|
|
array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION )
|
|
|
|
);
|
|
|
|
}
|
|
|
|
catch (PDOException $e) {
|
2014-06-23 16:35:54 +02:00
|
|
|
self::fatal(
|
2013-10-16 13:13:30 +02:00
|
|
|
"An error occurred while connecting to the database. ".
|
|
|
|
"The error reported by the server was: ".$e->getMessage()
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
return $db;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Execute an SQL query on the database
|
|
|
|
*
|
|
|
|
* @param resource $db Database handler
|
|
|
|
* @param array $bindings Array of PDO binding values from bind() to be
|
|
|
|
* used for safely escaping strings. Note that this can be given as the
|
|
|
|
* SQL query string if no bindings are required.
|
|
|
|
* @param string $sql SQL query to execute.
|
|
|
|
* @return array Result from the query (all rows)
|
|
|
|
*/
|
|
|
|
static function sql_exec ( $db, $bindings, $sql=null )
|
|
|
|
{
|
|
|
|
// Argument shifting
|
|
|
|
if ( $sql === null ) {
|
|
|
|
$sql = $bindings;
|
|
|
|
}
|
|
|
|
|
|
|
|
$stmt = $db->prepare( $sql );
|
|
|
|
//echo $sql;
|
|
|
|
|
|
|
|
// Bind parameters
|
|
|
|
if ( is_array( $bindings ) ) {
|
|
|
|
for ( $i=0, $ien=count($bindings) ; $i<$ien ; $i++ ) {
|
|
|
|
$binding = $bindings[$i];
|
|
|
|
$stmt->bindValue( $binding['key'], $binding['val'], $binding['type'] );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Execute
|
|
|
|
try {
|
|
|
|
$stmt->execute();
|
|
|
|
}
|
|
|
|
catch (PDOException $e) {
|
2014-06-23 16:35:54 +02:00
|
|
|
self::fatal( "An SQL error occurred: ".$e->getMessage() );
|
2013-10-16 13:13:30 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// Return all
|
2016-02-05 13:15:50 +01:00
|
|
|
return $stmt->fetchAll( PDO::FETCH_BOTH );
|
2013-10-16 13:13:30 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
|
|
* Internal methods
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Throw a fatal error.
|
|
|
|
*
|
|
|
|
* This writes out an error message in a JSON string which DataTables will
|
|
|
|
* see and show to the user in the browser.
|
|
|
|
*
|
|
|
|
* @param string $msg Message to send to the client
|
|
|
|
*/
|
|
|
|
static function fatal ( $msg )
|
|
|
|
{
|
|
|
|
echo json_encode( array(
|
|
|
|
"error" => $msg
|
|
|
|
) );
|
|
|
|
|
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Create a PDO binding key which can be used for escaping variables safely
|
|
|
|
* when executing a query with sql_exec()
|
|
|
|
*
|
|
|
|
* @param array &$a Array of bindings
|
|
|
|
* @param * $val Value to bind
|
|
|
|
* @param int $type PDO field type
|
|
|
|
* @return string Bound key to be used in the SQL where this parameter
|
|
|
|
* would be used.
|
|
|
|
*/
|
|
|
|
static function bind ( &$a, $val, $type )
|
|
|
|
{
|
|
|
|
$key = ':binding_'.count( $a );
|
|
|
|
|
|
|
|
$a[] = array(
|
|
|
|
'key' => $key,
|
|
|
|
'val' => $val,
|
|
|
|
'type' => $type
|
|
|
|
);
|
|
|
|
|
|
|
|
return $key;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Pull a particular property from each assoc. array in a numeric array,
|
|
|
|
* returning and array of the property values from each item.
|
|
|
|
*
|
|
|
|
* @param array $a Array to get data from
|
|
|
|
* @param string $prop Property to read
|
|
|
|
* @return array Array of property values
|
|
|
|
*/
|
|
|
|
static function pluck ( $a, $prop )
|
|
|
|
{
|
|
|
|
$out = array();
|
|
|
|
|
|
|
|
for ( $i=0, $len=count($a) ; $i<$len ; $i++ ) {
|
|
|
|
$out[] = $a[$i][$prop];
|
|
|
|
}
|
|
|
|
|
|
|
|
return $out;
|
|
|
|
}
|
2015-01-11 17:26:59 +01:00
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Return a string from an array or a string
|
|
|
|
*
|
|
|
|
* @param array|string $a Array to join
|
|
|
|
* @param string $join Glue for the concatenation
|
|
|
|
* @return string Joined string
|
|
|
|
*/
|
|
|
|
static function _flatten ( $a, $join = ' AND ' )
|
|
|
|
{
|
|
|
|
if ( ! $a ) {
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
else if ( $a && is_array($a) ) {
|
|
|
|
return implode( $join, $a );
|
|
|
|
}
|
|
|
|
return $a;
|
|
|
|
}
|
2013-10-16 13:13:30 +02:00
|
|
|
}
|
|
|
|
|