PHP MySQLI OOP not work - php

Question

I want to ask help for my MySQLI OOP. My MySQLI Class look like this:
Class DB {
Private $connection;
Public Function __construct($host = "localhost", $user = "root", $password = "", $db = "social_network") {
$this->host = $host;
$this->db = $db;
$this->user = $user;
$this->password = $password;
$this->connection = #new mysqli($this->host, $this->user, $this->password);
$this->connection->set_charset("UTF-8");
if($this->connection->connect_errno > 0){
die('Tietokantapalvelimeen ei saada yhteyttä [' . $this->connection->connect_error . ']');
} else {
if(!$this->connection->select_db($db)) {
die('Tietokantaan ei saada yhteyttä: ' . $this->connection->error);
}
return $this->connection;
}
}
Public Function connect() {
if(!$this->connection){
return $this->connection;
}
return true;
}
Public Function disconnect() {
if($this->connection){
$this->connection->kill($this->connection->thread_id);
$this->connection->close();
}
return true;
}
Public Function query($sql) {
return $this->connection->query($sql);
}
Public Function result($sql) {
$query = $this->connection->query($sql);
if($query){
$result = array();
$i = 0;
while($row = $query->fetch_object()){
$result[$i] = $row;
$i++;
}
return $result;
} else {
return print $this->connection->error;
}
}
Public Function escape_string($sql) {
return $this->connection->real_escape_string($sql);
}
Public Function __destruct() {
$this->disconnect();
}
}
Example result:
$DB = new DB($_CONFIG['host'], $_CONFIG['user'], $_CONFIG['password'], $_CONFIG['db']);
$row = $DB->result("SELECT username, password FROM users WHERE username = T0niiiiii LIMIT 1");
print $row['username'];
I get error "Unknown column 'T0niiiiii' in 'where clause' ".
So what is wrong? How i fix that? Or anyone know ready MySQLI OOP?

Answer 1

If you don't wrap the value with apostrophes, MYSQL will 'think' you're referencing a column.
This should be your code:
$DB->result("SELECT username, password FROM users WHERE username = 'T0niiiiii' LIMIT 1");
You didn't even need to ask in here, the error message says it all.
And about retrieving the row, you could do this:
$query = $DB->query("SELECT username, password FROM users WHERE username = 'T0niiiiii' LIMIT 1");
foreach ($query->result() as $row)
{
echo $row->username;
echo $row->password; //Never echo the password, this is just for testing :P
}