"Trying to get property of non-object" Inner Join using PDO - php

Question

i try show data using PDO. But i get Error "Trying to get property of non-object".
i have a simple script.
public function tampilUserId($user_id)
{
$sql = "SELECT $this->user.*, $this->provinsi.*
FROM $this->user
INNER JOIN $this->provinsi
ON $this->user.provinsi_id=$this->provinsi.provinsi_id
WHERE user_id=:user_id";
$stmt = db::prepare($sql);
$stmt->bindParam(':user_id', $user_id);
$stmt->execute();
return $stmt->fetchAll(PDO::FETCH_OBJ);
}
And this
echo $results->email_user;
print_r($result);
result
Notice: Trying to get property of non-object in C:\xampp\htdocs\laporan_app\user_views\profile.php on line 35
stdClass Object ( [user_id] => 45 [nama_dpn_user] => [nama_blkng_user] => [username_user] => adi [password_user] => $2y$10$p/8gF5BcQSooQUKRlEAiPuOSy4o1RMeXA5Ul8GTZNYZi/4wcOP3Ja [email_user] => adi#gmail.com [level_user] => mahasiswa [img_user] => [_dir_img_user] => [_size_img_user] => [provinsi_id] => [universitas_id] => )
And i try this script
echo $results['email_user'];
print_r($results);
result
Notice: Undefined index: email_user in C:\xampp\htdocs\laporan_app\user_views\profile.php on line 35
stdClass Object ( [user_id] => 45 [nama_dpn_user] => [nama_blkng_user] => [username_user] => adi [password_user] => $2y$10$p/8gF5BcQSooQUKRlEAiPuOSy4o1RMeXA5Ul8GTZNYZi/4wcOP3Ja [email_user] => adi#gmail.com [level_user] => mahasiswa [img_user] => [_dir_img_user] => [_size_img_user] => [provinsi_id] => [universitas_id] => )
Please help me, thanks before.

Answer 1

Merdeka! :D
In case your SQL query not contain any error its mean data was successfully pulled from database. So in your tampilUserId($user_id) function, its returning set of array from $stmt->fetchAll(PDO::FETCH_OBJ). Like below:
/* Sample from Sakila database */
array (size=603)
0 =>
object(stdClass)[11]
public 'address_id' => string '1' (length=1)
public 'address' => string '47 MySakila Drive' (length=17)
public 'address2' => null
public 'district' => string 'Alberta' (length=7)
public 'city_id' => string '300' (length=3)
public 'postal_code' => string '' (length=0)
public 'phone' => string '' (length=0)
public 'last_update' => string '2014-09-25 22:30:27' (length=19)
1 =>
object(stdClass)[12]
public 'address_id' => string '2' (length=1)
public 'address' => string '28 MySQL Boulevard' (length=18)
public 'address2' => null
public 'district' => string 'QLD' (length=3)
public 'city_id' => string '576' (length=3)
public 'postal_code' => string '' (length=0)
public 'phone' => string '' (length=0)
public 'last_update' => string '2014-09-25 22:30:09' (length=19)
more elements...
All you need to do is looping your function returned value first whereever you call it. Short example from your case:
//I dont know you put it under class or not.
$data = $YourClass->tampilUserId($user_id);
foreach ($data as $item) {
echo $item->email_user);
}
Note:
You can manually echoing your data without looping and its bad practice because you dont know the length of the array. So this is just gusessing. Taken from your case it would be.
$data = $YourClass->tampilUserId($user_id);
$data[0]->email_user; //If an object
$data[0]['email_user']; //If an array
Update:
There is suspicious thing on your query. The variable $this->user is not look like column name to me(unsure) If yes, so you have small mistake on your query. Secondly, as you said the result is null its mean something wrong or data you search not exist. I put this sample running inner join query.
Example:
Lets said i had 2 table. 1st is address and 2nd is city
|address table|
|city table|
So your sql query for joining table(from image above) should be:
SELECT adr.address_id, adr.address, adr.district, adr.city_id, c.city_id,
c.city FROM address AS adr INNER JOIN city AS c ON adr.city_id = c.city_id
WHERE c.city_id = 300 #using city id
Output:
Bring it to PHP
<?php
$pdo= new PDO('mysql:dbname=sakila;host=localhost:3306', 'user', password');
$city_id = 300; // manual set
$sql = 'SELECT adr.address_id, adr.address, adr.district, adr.city_id,
c.city_id, c.city FROM address AS adr INNER JOIN city AS c ON
adr.city_id = c.city_id WHERE c.city_id = :city_id';
$stmt = $_this->db->prepare($sql);
$stmt->bindParam(':city_id', $city_id);
$stmt->execute();
$data = $stmt->fetchAll(PDO::FETCH_OBJ);
?>
var_dump($data) giving a result:
Great, as it come as (object(stdClass)) so we can loop it through the array & then accessing it using -> sign.
<?php
$i = 1;
foreach ($data as $d) {
echo '<dl>';
echo '<dt>Adress '.$i++.':</dt>';
echo '<li>Address id: '.$d->address_id.'</li>';
echo '<li>Address: '.$d->address.'</li>';
echo '<li>District: '.$d->district.'</li>';
echo '<li>City id: '.$d->city_id.'</li>';
echo '<li>City name: '.$d->city.'</li>';
echo '</dl>';
}
?>
Result in browser:
Hope this will resolve your problem.