Cannot fetch the value from JsonArray - php

Question

I am having problem fetching out the value from PHP coding to my android. The logcat shows that
:W/System.err: org.json.JSONException:
No value for posts.
This is my php code:
<?php
require("config1.php");
$query="SELECT commentName,comment FROM discussion_comment WHERE discussID = :discussID";
$query_params=array(':discussID'=> $_POST['discussID']);
try {
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
$rows = $stmt->fetchAll();
if ($rows){
$response["success"]=1;
$response["message"]="Post Available";
$response["posts"]= array();
foreach ($rows as $row){
$post = array();
$post["commentName"] = $row["commentName"];
$post["comment"] = $row["comment"];
array_push($response["posts"], $post);
}
echo json_encode($response);
}else {
$response["success"] = 0;
$response["message"] = "No post Available!";
die(json_encode($response));
?>
When is remove the 'WHERE discussID = :discussID"', I am able to fetch the data, but some is not necessary. What other way to write with Where condition.
My java:
private static final String COMMENT_NAME="commentName";
private static final String COMMENT="comment";
private static final String COMMENT_VIEW_URL="http://fysystem.com/show_comment.php";
#Override
protected String doInBackground(String... args) {
try {
json=jsonParser.getJSONFromUrl(COMMENT_VIEW_URL);
JSONArray jsonArray=json.getJSONArray("posts");
for(int i = 0; i<jsonArray.length();i++) {
json=jsonArray.getJSONObject(i);
commentName=json.getString(COMMENT_NAME);
comment=json.getString(COMMENT);
}
Appreciate your help.

Answer 1

PHP
<?php
require("config1.php");
// Default message
$response = array('success'=>0, 'message'=>'Error. Pass required parameters');
// Check discussID exists in POST params
if(isset($_POST['discussID']) && $_POST['discussID']!=""){
$sql = 'SELECT `commentName`, `comment` FROM `discussion_comment` WHERE `discussID` = :discussID';
try {
// Hope $db is defined in config1.php
$stmt = $db->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL));
$stmt->execute(array(':discussID'=> $_POST['discussID']));
$response = array("success"=>0, "message"=>"Discussion Not found");
// If data exists
if($stmt->rowCount()>0){
// Fetching rows with a scrollable cursor
// http://php.net/manual/en/pdostatement.fetch.php
$posts = array();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$posts[] = array('commentName'=>$row['commentName'], 'comment' => $row['comment']);
}
// Set the success status 1 and add the posts in return response
$response = array('success'=>1, 'message'=>'Discussion found', 'posts'=>$posts);
}
$stmt = null;
}
catch (PDOException $e) {
// print $e->getMessage();
$response = array('success'=>0, 'message'=>'DB Error');
}
}
// Finally return the response
echo json_encode($response);
?>
Andorid
try {
json=jsonParser.getJSONFromUrl(COMMENT_VIEW_URL);
int success = json.getInt('success');
// Check before access posts data
if(success==1){
JSONArray jsonArray=json.getJSONArray("posts");
for(int i = 0; i<jsonArray.length();i++) {
json=jsonArray.getJSONObject(i);
commentName=json.getString(COMMENT_NAME);
comment=json.getString(COMMENT);
}
}else{
// Handle it here if parameters not exist or db error or no discussion found
}
}
Hope this helps!