7
Ciao Sto riscontrando alcuni problemi nel far funzionare la funzionalità di elaborazione lato server delle tabelle di dati con SQL Server.Elaborazione lato server con Datatables v1.10.0
Ho una pagina di test che dovrebbe visualizzare due colonne da una tabella di database (per ora).
HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<link rel="Stylesheet" type="text/css" href="DataTables-1.10.0/media/css/jquery.dataTables.min.css" />
</head>
<body>
<table id="example" class="display" cellspacing="0" width="100%">
<thead>
<tr>
<th align="center">PK</th>
<th align="center">Network</th>
</tr>
</thead>
<tfoot>
<tr>
<th align="center">PK</th>
<th align="center">Network</th>
</tr>
</tfoot>
</table>
</body>
<script type="text/javascript" src="DataTables-1.10.0/media/js/jquery.js"></script>
<script type="text/javascript" src="DataTables-1.10.0/media/js/jquery.dataTables.min.js">
</script>
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
$('#example').dataTable({
"processing": true,
"bServerSide": true,
"ajax": "PHP/testGetArchive.php"
});
});
</script>
</html>
Sto utilizzando il codice di esempio si trova sul sito qui per le funzioni lato server:
http://next.datatables.net/examples/server_side/simple.html
Questa è la mia versione della pagina php chiamato :
Questo quindi chiama il secondo esempio PHP fou ND qui:
https://github.com/DataTables/DataTables/blob/master/examples/server_side/scripts/ssp.class.php
Qui è la mia copia di esso. L'unica modifica che ho eseguito è stata quella di rimuovere il blocco di codice richiesto per gli esempi.
<?php
/*
* Helper functions for building a DataTables server-side processing SQL query
*
* The static functions in this class are just helper functions to help build
* the SQL used in the DataTables demo server-side processing scripts. These
* functions obviously do not represent all that can be done with server-side
* processing, they are intentionally simple to show how it works. More complex
* server-side processing operations will likely require a custom script.
*
* See http://datatables.net/usage/server-side for full details on the server-
* side processing requirements of DataTables.
*
* @license MIT - http://datatables.net/license_mit
*/
class SSP {
/**
* Create the data output array for the DataTables rows
*
* @param array $columns Column information array
* @param array $data Data from the SQL get
* @return array Formatted data in a row based format
*/
static function data_output ($columns, $data)
{
$out = array();
for ($i=0, $ien=count($data) ; $i<$ien ; $i++) {
$row = array();
for ($j=0, $jen=count($columns) ; $j<$jen ; $j++) {
$column = $columns[$j];
// Is there a formatter?
if (isset($column['formatter'])) {
$row[ $column['dt'] ] = $column['formatter']($data[$i][ $column['db'] ], $data[$i]);
}
else {
$row[ $column['dt'] ] = $data[$i][ $columns[$j]['db'] ];
}
}
$out[] = $row;
}
return $out;
}
/**
* Paging
*
* Construct the LIMIT clause for server-side processing SQL query
*
* @param array $request Data sent to server by DataTables
* @param array $columns Column information array
* @return string SQL limit clause
*/
static function limit ($request, $columns)
{
$limit = '';
if (isset($request['start']) && $request['length'] != -1) {
$limit = "LIMIT ".intval($request['start']).", ".intval($request['length']);
}
return $limit;
}
/**
* Ordering
*
* Construct the ORDER BY clause for server-side processing SQL query
*
* @param array $request Data sent to server by DataTables
* @param array $columns Column information array
* @return string SQL order by clause
*/
static function order ($request, $columns)
{
$order = '';
if (isset($request['order']) && count($request['order'])) {
$orderBy = array();
$dtColumns = SSP::pluck($columns, 'dt');
for ($i=0, $ien=count($request['order']) ; $i<$ien ; $i++) {
// Convert the column index into the column data property
$columnIdx = intval($request['order'][$i]['column']);
$requestColumn = $request['columns'][$columnIdx];
$columnIdx = array_search($requestColumn['data'], $dtColumns);
$column = $columns[ $columnIdx ];
if ($requestColumn['orderable'] == 'true') {
$dir = $request['order'][$i]['dir'] === 'asc' ?
'ASC' :
'DESC';
$orderBy[] = '`'.$column['db'].'` '.$dir;
}
}
$order = 'ORDER BY '.implode(', ', $orderBy);
}
return $order;
}
/**
* Searching/Filtering
*
* Construct the WHERE clause for server-side processing SQL query.
*
* NOTE this does not match the built-in DataTables filtering which does it
* word by word on any field. It's possible to do here performance on large
* databases would be very poor
*
* @param array $request Data sent to server by DataTables
* @param array $columns Column information array
* @param array $bindings Array of values for PDO bindings, used in the
* sql_exec() function
* @return string SQL where clause
*/
static function filter ($request, $columns, &$bindings)
{
$globalSearch = array();
$columnSearch = array();
$dtColumns = SSP::pluck($columns, 'dt');
if (isset($request['search']) && $request['search']['value'] != '') {
$str = $request['search']['value'];
for ($i=0, $ien=count($request['columns']) ; $i<$ien ; $i++) {
$requestColumn = $request['columns'][$i];
$columnIdx = array_search($requestColumn['data'], $dtColumns);
$column = $columns[ $columnIdx ];
if ($requestColumn['searchable'] == 'true') {
$binding = SSP::bind($bindings, '%'.$str.'%', PDO::PARAM_STR);
$globalSearch[] = "`".$column['db']."` LIKE ".$binding;
}
}
}
// Individual column filtering
for ($i=0, $ien=count($request['columns']) ; $i<$ien ; $i++) {
$requestColumn = $request['columns'][$i];
$columnIdx = array_search($requestColumn['data'], $dtColumns);
$column = $columns[ $columnIdx ];
$str = $requestColumn['search']['value'];
if ($requestColumn['searchable'] == 'true' &&
$str != '') {
$binding = SSP::bind($bindings, '%'.$str.'%', PDO::PARAM_STR);
$columnSearch[] = "`".$column['db']."` LIKE ".$binding;
}
}
// Combine the filters into a single string
$where = '';
if (count($globalSearch)) {
$where = '('.implode(' OR ', $globalSearch).')';
}
if (count($columnSearch)) {
$where = $where === '' ?
implode(' AND ', $columnSearch) :
$where .' AND '. implode(' AND ', $columnSearch);
}
if ($where !== '') {
$where = 'WHERE '.$where;
}
return $where;
}
/**
* Perform the SQL queries needed for an server-side processing requested,
* utilising the helper functions of this class, limit(), order() and
* filter() among others. The returned array is ready to be encoded as JSON
* in response to an SSP request, or can be modified if needed before
* sending back to the client.
*
* @param array $request Data sent to server by DataTables
* @param array $sql_details SQL connection details - see sql_connect()
* @param string $table SQL table to query
* @param string $primaryKey Primary key of the table
* @param array $columns Column information array
* @return array Server-side processing response array
*/
static function simple ($request, $sql_details, $table, $primaryKey, $columns)
{
$bindings = array();
$db = SSP::sql_connect($sql_details);
// Build the SQL query string from the request
$limit = SSP::limit($request, $columns);
$order = SSP::order($request, $columns);
$where = SSP::filter($request, $columns, $bindings);
// Main query to actually get the data
$data = SSP::sql_exec($db, $bindings,
"SELECT SQL_CALC_FOUND_ROWS `".implode("`, `", SSP::pluck($columns, 'db'))."`
FROM `$table`
$where
$order
$limit"
);
// Data set length after filtering
$resFilterLength = SSP::sql_exec($db,
"SELECT FOUND_ROWS()"
);
$recordsFiltered = $resFilterLength[0][0];
// Total data set length
$resTotalLength = SSP::sql_exec($db,
"SELECT COUNT(`{$primaryKey}`)
FROM `$table`"
);
$recordsTotal = $resTotalLength[0][0];
/*
* Output
*/
return array(
"draw" => intval($request['draw']),
"recordsTotal" => intval($recordsTotal),
"recordsFiltered" => intval($recordsFiltered),
"data" => SSP::data_output($columns, $data)
);
}
/**
* 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 $e) {
SSP::fatal(
"An error occurred while connecting to the database. ".
"The error reported by the server was: ".$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 $e) {
SSP::fatal("An SQL error occurred: ".$e->getMessage());
}
// Return all
return $stmt->fetchAll();
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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;
}
}
Continuo a ricevere un errore che dice che il codice non riesce a trovare il driver anche se ho le Driver sqlserv e pdo_sqlsrv installati din mio ambiente php. C'è qualcosa di sbagliato nel codice che sta causando questo errore? I miei driver sono errati? Qualsiasi aiuto con questo sarebbe apprezzato. Sono in grado di elaborare fino a 65.000 righe di dati e inviarle tutte al cliente in una volta, sarà impossibile.