Allowed memory size and Undefined index: sEcho

jemz · October 2014

Hi I am having problem with my datatable I could load my data using Server side processing.it gives me this error

Notice: Undefined index: sEcho in ....on line 171

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 36 bytes) on line 177

I am using
DataTables 1.10.3-dev
Â©2008-2014 SpryMedia Ltd - datatables.net/license

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
  
  
    <link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
    <link rel="stylesheet" type="text/css" href="css/dataTables.bootstrap.css">
  
    <script src="js/jquery.min.js"></script>
    <script type="text/javascript" src="js/jquery.dataTables.min.js"></script>
    <script type="text/javascript"  src="js/dataTablesBootstrap.js"></script>
  
  
  
    <script type="text/javascript" charset="utf-8">
  
  
        $(document).ready(function() {
  
                    $('#example').dataTable( {
                        "processing": true,
                        "serverSide": true,
                        "start": 0,
                        "ajax": {
                            url:"server_side.php"
                        },
                        "columns": [
                            { "data": "id"},
                            { "data": "empno"},
                            { "data": "firstname"},
                            { "data": "lastname"}
  
                        ]
  
                    } );
  
        } );
  
  
  
  
    </script>
  
  
</head>
<body>
<div class="container">
    <table id="example" class="display" cellspacing="0" width="100%">
        <thead>
        <tr>
            <th>ID</th>
            <th>EMPNO</th>
            <th>FIRSTNAME</th>
            <th>LASTNAME</th>
  
        </tr>
        </thead>
  
  
    </table>
</div>
  
  
</body>
</html>

server_side.php

```
<?php
/*
* Script: DataTables server-side script for PHP and MySQL
* Copyright: 2010 - Allan Jardine, 2012 - Chris Wright
* License: GPL v2 or BSD (3-point)
*/

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Easy set variables
*/

/* Array of database columns which should be read and sent back to DataTables. Use a space where
* you want to insert a non-database field (for example a counter or static image)
*/
$aColumns = array( 'id', 'empno', 'firstname', 'lastname');

/* Indexed column (used for fast and accurate table cardinality) */
$sIndexColumn = "id";

/* DB table to use */
$sTable = "employee";

/* Database connection information */
$gaSql['user'] = "root";
$gaSql['password'] = "";
$gaSql['db'] = "mydb";
$gaSql['server'] = "localhost";

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* If you just want to use the basic configuration for DataTables with PHP server-side, there is
* no need to edit below this line
*/

/*
* Local functions
*/
function fatal_error ( $sErrorMessage = '' )
{
header( $_SERVER['SERVER_PROTOCOL'] .' 500 Internal Server Error' );
die( $sErrorMessage );
}

/*
* MySQL connection
*/
if ( ! $gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password'] ) )
{
fatal_error( 'Could not open connection to server' );
}

if ( ! mysql_select_db( $gaSql['db'], $gaSql['link'] ) )
{
fatal_error( 'Could not select database ' );
}

/*
* Paging
*/
$sLimit = "";
if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
{
$sLimit = "LIMIT ".intval( $_GET['iDisplayStart'] ).", ".
intval( $_GET['iDisplayLength'] );
}

/*
* Ordering
*/
$sOrder = "";
if ( isset( $_GET['iSortCol_0'] ) )
{
$sOrder = "ORDER BY ";
for ( $i=0 ; $i<intval( $_GET['iSortingCols'] ) ; $i++ )
{
if ( $_GET[ 'bSortable_'.intval($_GET['iSortCol_'.$i]) ] == "true" )
{
$sOrder .= $aColumns[ intval( $_GET['iSortCol_'.$i] ) ]."
".($_GET['sSortDir_'.$i]==='asc' ? 'asc' : 'desc') .", ";
}
}

$sOrder = substr_replace( $sOrder, "", -2 );
if ( $sOrder == "ORDER BY" )
{
    $sOrder = "";
}

}

/*
* Filtering
* 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, but concerned about efficiency
* on very large tables, and MySQL's regex functionality is very limited
*/
$sWhere = "";
if ( isset($_GET['sSearch']) && $_GET['sSearch'] != "" )
{
$sWhere = "WHERE (";
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( isset($_GET['bSearchable_'.$i]) && $_GET['bSearchable_'.$i] == "true" )
{
$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $_GET['sSearch'] )."%' OR ";
}
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= ')';
}

/* Individual column filtering */
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( isset($_GET['bSearchable_'.$i]) && $_GET['bSearchable_'.$i] == "true" && $_GET['sSearch_'.$i] != '' )
{
if ( $sWhere == "" )
{
$sWhere = "WHERE ";
}
else
{
$sWhere .= " AND ";
}
$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string($_GET['sSearch_'.$i])."%' ";
}
}

/*
* SQL queries
* Get data to display
*/
$sQuery = "
SELECT SQL_CALC_FOUND_ROWS id,device_id,latitude,longitude "."
FROM $sTable
$sWhere
$sOrder
$sLimit
";

$rResult = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );

/* Data set length after filtering */
$sQuery = "
SELECT FOUND_ROWS()
";
$rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
$aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
$iFilteredTotal = $aResultFilterTotal[0];

/* Total data set length */
$sQuery = "
SELECT COUNT(".$sIndexColumn.")
FROM $sTable
";
$rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
$aResultTotal = mysql_fetch_array($rResultTotal);
$iTotal = $aResultTotal[0];

/*
* Output
*/
$output = array(
"sEcho" => intval($_GET['sEcho']),
"iTotalRecords" => $iTotal,
"iTotalDisplayRecords" => $iFilteredTotal,
"aaData" => array()
);

while ( $aRow = mysql_fetch_array( $rResult ) )
{
$row = array();
for ( $i=0 ; $i<count($aColumns) ; $i++ )
{
if ( $aColumns[$i] == "version" )
{
/* Special output formatting for 'version' column /
$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
}
else if ( $aColumns[$i] != ' ' )
{
/ General output */
$row[] = $aRow[ $aColumns[$i] ];
}
}
$output['aaData'][] = $row;
}

echo json_encode( $output );

<?php > ``` ?>

allan · October 2014

The script you are using is for the old style parameters. See the server-side processing manual for more information.

Allan

jemz · October 2014

@Allan,Thank you for the reply.,can you please give me example what you mean I am confuse here.

Thank you in advance.

jemz · October 2014

@Allan,

Is this what you mean to change it to this

 "columns": [
                            [ 0, "id"],
                            [ 1, "empno"],
                            [ 2, "firstname"],
                            [ 3, "lastname"]
   
                        ]

it works fine now also i tried this server side script.

<?php
 
/*
 * DataTables example server-side processing script.
 *
 * Please note that this script is intentionally extremely simply to show how
 * server-side processing can be implemented, and probably shouldn't be used as
 * the basis for a large complex system. It is suitable for simple use cases as
 * for learning.
 *
 * 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
 */
 
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Easy set variables
 */
 
// DB table to use
$table = 'datatables_demo';
 
// Table's primary key
$primaryKey = 'id';
 
// Array of database columns which should be read and sent back to DataTables.
// The `db` parameter represents the column name in the database, while the `dt`
// parameter represents the DataTables column identifier. In this case simple
// indexes
$columns = array(
    array( 'db' => 'first_name', 'dt' => 0 ),
    array( 'db' => 'last_name',  'dt' => 1 ),
    array( 'db' => 'position',   'dt' => 2 ),
    array( 'db' => 'office',     'dt' => 3 ),
    array(
        'db'        => 'start_date',
        'dt'        => 4,
        'formatter' => function( $d, $row ) {
            return date( 'jS M y', strtotime($d));
        }
    ),
    array(
        'db'        => 'salary',
        'dt'        => 5,
        'formatter' => function( $d, $row ) {
            return '$'.number_format($d);
        }
    )
);
 
// SQL server connection information
$sql_details = array(
    'user' => '',
    'pass' => '',
    'db'   => '',
    'host' => ''
);
 
 
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * If you just want to use the basic configuration for DataTables with PHP
 * server-side, there is no need to edit below this line.
 */
 
require( 'ssp.class.php' );
 
echo json_encode(
    SSP::simple( $_GET, $sql_details, $table, $primaryKey, $columns )
);

and the ssp.class.php

https://github.com/DataTables/DataTables/blob/master/examples/server_side/scripts/ssp.class.php

allan · October 2014

The new server-side processing script uses the new parameters that DataTables 1.10 sends. If you wanted to use the old script you could force DataTables into its legacy mode using the information in the manual link above. However, I would suggest the correct thing to do is use the new script as you have done.

Allan

Allowed memory size and Undefined index: sEcho

Allowed memory size and Undefined index: sEcho

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Allowed memory size and Undefined index: sEcho

Allowed memory size and Undefined index: sEcho

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