How to use mysql query result with WebDataRocks

I did the below but i have no result on my page 🙁

Start you					   	<div id="wdr-component">
					   	 <?php
					   	   $json_data[]=array();
					   	 
					   	 if($stmt->execute()) {
					   	     while($res = $stmt->fetchAll(PDO::FETCH_ASSOC)){
					   	         $json_data[] = $res;
					   	     }
					   	     // debug
					   	     //var_dump($res);
					   	     // debug
					   	     
					   	 } else {
					   	     print_r($stmt->errorInfo());
					   	 }
					   	 
					   	 echo json_encode($json_data);
					   	            			
					   	?>
					   	</div>
								<script>
									var pivot = new WebDataRocks({
										container: "#wdr-component",
										toolbar: true,
										report: {
											dataSource: {
												data:"json_data"
											}
										}
									 });								

r code here

problem solved! 🙂
 
<div id=”wdr-component”></div>
<?php
if($stmt->execute()) {
while($res = $stmt->fetch(PDO::FETCH_ASSOC)){

$json_data[] = array(
“ticket_id” => utf8_encode($res[“xxxxx”]),
“classification” => utf8_encode($res[“xxxxx”]),
“severity” => utf8_encode($res[“xxx”]),
“status” => utf8_encode($res[“xxxx”]),
“product” => utf8_encode($res[“xxxx”]),
“assignee” => utf8_encode($res[“xxxx”]),
“opened” => utf8_encode($res[“xxxxx”]),
“cf_platforme” => utf8_encode($res[“xxxx”]),
“version” => utf8_encode($res[‘xxxxxx’])

);
}
} else {
print_r($stmt->errorInfo());
};
//print json_encode($json_data);
//fermeture de la connexion
$conn=null;

?>
<script>
var json_data = <?php print json_encode($json_data);?>;
var pivot = new WebDataRocks({
container: “#wdr-component”,
toolbar: true,
report: {
dataSource: {
data:json_data
},