Question

I’m trying to create a user management system class and one of my functions is to check if a value is in a column in the database. It returns nothing at all.

Here is the relevant information:

require("opperators/connect.php");
class UserManagemen
{
protected $db;

public function __construct(PDO $db)
  {
    $this->db = $db;
  }
public function isInDatabase($checkIfThis, $isHere)
  {
    $stmt = $db->prepare("SELECT 1 from users WHERE $isHere = :$isHere");
    $stmt->execute(array(':$isHere' => $checkIfThis));
        if ($stmt->rowCount() > 0) {
        echo "It's in the database";
        } else {
        echo "Not in the database and you are good to go!";
        }
   }
}
$usermanagement = new UserManagemen($db, null, null, null);
$usermanagement->isInDatabase(Batman, username);

in connect.php: this worked in my procedural coding test.

$configurator['database'] = array(
'username' =>   'root',
'password' =>   'root',
'host' =>    'localhost',
'db' =>    'girlscouts',
);
$options  = array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'
);
try {
$db = new PDO("mysql:host={$configurator['database']['host']};dbname={$configurator['database']['db']};charset=utf8", $configurator['database']['username'], $configurator['database']['password'], $options);
}
catch (PDOException $ex) { 
die("Failed to connect to the database: " . $ex->getMessage());
}

I apologise in advance if this has been asked repeatedly, I’ve tried a google but returned nothing of value, possibly because I don’t know what to google. I’m not big on asking for help but I’ll give it a shot.

Answer 1

I think it should be

if ($stmt->rowCount() > 0) { // data available
    echo "It's in the database";
} else {
    echo "Not in the database and you are good to go!";
}

instead of

if ($stmt->rowCount() > 0) {
    echo "Not in the database and you are good to go!";
} else {
    echo "It's in the database";
}

Also you didn’t initialize the PDO like new PDO(...);, in your constructor it should be

$this->db = new PDO(...);

and you should use it like

$stmt=$this->db->prepare(...);
$stmt->execute(...);

Take a look at this and this for details.