PDO query doesn't work - php

Question

I can't do a query.
This is my code, where I connect to database and try to query.
EDIT :
class DatabaseConnection {
private $host;
private $port;
private $dbname;
private $username;
private $password;
private $query;
function __construct($host, $port, $dbname, $username, $password) {
$this->host = $host;
$this->port = $port;
$this->dbname = $dbname;
$this->username = $username;
$this->password = $password;
try {
$conn = new PDO("pgsql:host=$this->host port=$this->port dbname=$this->dbname", "$this->username", "$this->password");
echo "PDO connection object created";
}
catch(PDOException $e) {
echo $e->getMessage();
}
}
function setQuery($query) {
$this->query = $query;
$sth = $db->prepare($this->query);
$sth->execute();
$result = $sth->fetchAll();
var_dump($result);
}
}
$db = new DatabaseConnection('144.76.6.45','5432','eu','eu','eu123');
$db->setQuery('SELECT * FROM user');
This is my code, I don't have any errors, but still it doesn't work.....

Answer 1

Depending on the type of query you will want to fetch data after executing it. Take a look at fetch() and fetchAll() methods.
$sth = $db->prepare($this->query);
$sth->execute();
$result = $sth->fetchAll();
var_dump($result);
or use a loop and fetch row by row
while ($row = $sth->fetch(PDO::FETCH_ASSOC)) {
var_dump($row);
}
after your edit:
Try to replace:
$conn = new PDO("pgsql:host=$this->host port=$this->port dbname=$this->dbname", "$this->username", "$this->password");
with
$this->db = new PDO("pgsql:host=$this->host port=$this->port dbname=$this->dbname", "$this->username", "$this->password");
and then call prepare method on it: $sth = $this->db->prepare($this->query); instead of $sth = $db->prepare($this->query);