588 lines
16 KiB
PHP
588 lines
16 KiB
PHP
<?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 https://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 - https://datatables.net/license_mit
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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( $column['formatter'] ) ) {
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if(empty($column['db'])){
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$row[ $column['dt'] ] = $column['formatter']( $data[$i] );
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}
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else{
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$row[ $column['dt'] ] = $column['formatter']( $data[$i][ $column['db'] ], $data[$i] );
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}
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}
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else {
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if(!empty($column['db'])){
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$row[ $column['dt'] ] = $data[$i][ $columns[$j]['db'] ];
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}
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else{
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$row[ $column['dt'] ] = "";
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}
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}
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}
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$out[] = $row;
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}
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return $out;
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}
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/**
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* 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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* * Optional: `'charset' => 'utf8'` - you might need this depending on your PHP / MySQL config
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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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/**
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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 ( $tableAS, $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( $columnIdx, $dtColumns );
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$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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$orderBy[] = '`'.$tableAS.'`.`'.$column['db'].'` '.$dir;
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}
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}
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if ( count( $orderBy ) ) {
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$order = 'ORDER BY '.implode(', ', $orderBy);
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}
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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 ( $tablesAS, $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 ( $requestColumn['searchable'] == 'true' ) {
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if(!empty($column['db'])){
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$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
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$globalSearch[] = "`".$tablesAS."`.`".$column['db']."` LIKE ".$binding;
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}
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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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if(!empty($column['db'])){
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$binding = self::bind( $bindings, '%'.$str.'%', PDO::PARAM_STR );
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$columnSearch[] = "`".$tablesAS."`.`".$column['db']."` LIKE ".$binding;
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}
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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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/**
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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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* @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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* @return array Server-side processing response array
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*/
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static function simple ( $request, $conn, $table, $primaryKey, $columns )
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{
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$bindings = array();
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$db = self::db( $conn );
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// Allow for a JSON string to be passed in
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if (isset($request['json'])) {
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$request = json_decode($request['json'], true);
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}
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// table AS
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$tablesAS = null;
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if(is_array($table)) {
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$tablesAS = $table[1];
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$table = $table[0];
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}
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// Build the SQL query string from the request
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$limit = self::limit( $request, $columns );
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$order = self::order( $tablesAS, $request, $columns );
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$where = self::filter( $tablesAS, $request, $columns, $bindings );
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// Main query to actually get the data
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$data = self::sql_exec( $db, $bindings,
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"SELECT `$tablesAS`.`".implode("`, `$tablesAS`.`", self::pluck($columns, 'db'))."`
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FROM `$table` AS `$tablesAS`
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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 = self::sql_exec( $db, $bindings,
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"SELECT COUNT(`{$primaryKey}`)
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FROM `$table` AS `$tablesAS`
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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 = self::sql_exec( $db,
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"SELECT COUNT(`{$primaryKey}`)
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FROM `$table` AS `$tablesAS`"
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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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/**
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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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* In both cases the extra condition can be added as a simple string, or if
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* you are using external values, as an assoc. array with `condition` and
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* `bindings` parameters. The `condition` is a string with the SQL WHERE
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* condition and `bindings` is an assoc. array of the binding names and
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* values.
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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|array $table SQL table to query, if array second key is AS
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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 $join JOIN sql string
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* @param string|array $whereResult WHERE condition to apply to the result set
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* @return array Server-side processing response array
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*/
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static function complex (
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$request,
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$conn,
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$table,
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$primaryKey,
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$columns,
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$join=null,
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$whereResult=null
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) {
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$bindings = array();
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$db = self::db( $conn );
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// table AS
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$tablesAS = null;
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if(is_array($table)) {
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$tablesAS = $table[1];
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$table = $table[0];
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}
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// Build the SQL query string from the request
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$limit = self::limit( $request, $columns );
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$order = self::order( $tablesAS, $request, $columns );
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$where = self::filter( $tablesAS, $request, $columns, $bindings );
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// whereResult can be a simple string, or an assoc. array with a
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// condition and bindings
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if ( $whereResult ) {
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$str = $whereResult;
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if ( is_array($whereResult) ) {
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$str = $whereResult['condition'];
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if ( isset($whereResult['bindings']) ) {
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self::add_bindings($bindings, $whereResult);
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}
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}
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$where = $where ?
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$where .' AND '.$str :
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'WHERE '.$str;
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}
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// Main query to actually get the data
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$data = self::sql_exec( $db, $bindings,
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"SELECT `$tablesAS`.`".implode("`, `$tablesAS`.`", self::pluck($columns, 'db'))."`
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FROM `$table` AS `$tablesAS`
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$join
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$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 = self::sql_exec( $db, $bindings,
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"SELECT COUNT(`{$tablesAS}`.`{$primaryKey}`)
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FROM `$table` AS `$tablesAS`
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$join
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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 = self::sql_exec( $db, $bindings,
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"SELECT COUNT(`{$tablesAS}`.`{$primaryKey}`)
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FROM `$table` AS `$tablesAS`
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$join
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$where"
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);
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$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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/**
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* Connect to the database
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*
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* @param array $sql_details SQL server connection details array, with the
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* 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 Database connection handle
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*/
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static function sql_connect ( $sql_details )
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{
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try {
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$db = @new PDO(
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"mysql:host={$sql_details['host']};dbname={$sql_details['db']}",
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$sql_details['user'],
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$sql_details['pass'],
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array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION )
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);
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}
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catch (PDOException $e) {
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self::fatal(
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"An error occurred while connecting to the database. ".
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"The error reported by the server was: ".$e->getMessage()
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);
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}
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return $db;
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}
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/**
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* Execute an SQL query on the database
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*
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* @param resource $db Database handler
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* @param array $bindings Array of PDO binding values from bind() to be
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* used for safely escaping strings. Note that this can be given as the
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* SQL query string if no bindings are required.
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* @param string $sql SQL query to execute.
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* @return array Result from the query (all rows)
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*/
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static function sql_exec ( $db, $bindings, $sql=null )
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{
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// Argument shifting
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if ( $sql === null ) {
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$sql = $bindings;
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}
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$stmt = $db->prepare( $sql );
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// Bind parameters
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if ( is_array( $bindings ) ) {
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for ( $i=0, $ien=count($bindings) ; $i<$ien ; $i++ ) {
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$binding = $bindings[$i];
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$stmt->bindValue( $binding['key'], $binding['val'], $binding['type'] );
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}
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}
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// Execute
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try {
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$stmt->execute();
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}
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catch (PDOException $e) {
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self::fatal( "An SQL error occurred: ".$e->getMessage() );
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}
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// Return all
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return $stmt->fetchAll( PDO::FETCH_BOTH );
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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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* Throw a fatal error.
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*
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* This writes out an error message in a JSON string which DataTables will
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* see and show to the user in the browser.
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*
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* @param string $msg Message to send to the client
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*/
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static function fatal ( $msg )
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{
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echo json_encode( array(
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"error" => $msg
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) );
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exit(0);
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}
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/**
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* Create a PDO binding key which can be used for escaping variables safely
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* when executing a query with sql_exec()
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*
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* @param array &$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 $key;
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}
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static function add_bindings(&$bindings, $vals)
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{
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foreach($vals['bindings'] as $key => $value) {
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$bindings[] = array(
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'key' => $key,
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'val' => $value,
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'type' => PDO::PARAM_STR
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);
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}
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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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|
{
|
|
$out = array();
|
|
|
|
for ( $i=0, $len=count($a) ; $i<$len ; $i++ ) {
|
|
if ( empty($a[$i][$prop]) && $a[$i][$prop] !== 0 ) {
|
|
continue;
|
|
}
|
|
|
|
//removing the $out array index confuses the filter method in doing proper binding,
|
|
//adding it ensures that the array data are mapped correctly
|
|
$out[$i] = $a[$i][$prop];
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|
|
|