致命错误：在第9行调用未定义的方法PDO :: select（）

Question

something strange has happened to my site. Everything was working perfect, and now i'm getting this error when i'm trying to log in:

Fatal error: Call to undefined method PDO::select() in line 9

Here is my code:

<?php
$db = new PDO('mysql:host=****;dbname=******;charset=utf8', '*****', '*****');

if($_SERVER["REQUEST_METHOD"] == "POST")
{
// username and password sent from Form
$myusername = $_POST['username'];
$mypassword = $_POST['password'];
$result = $db->select("SELECT userID FROM miembros WHERE user='$myusername' and  pass='$mypassword' AND confirm IS NULL");
$row = $result->fetch(PDO::FETCH_ASSOC);
$count = $result->rowCount();
// code continues
?>

What i am doing wrong at line 9 and $db?

Answer 1

You want to use PDO::prepare to prepare a statement which you then execute

  $db = new PDO('mysql:host=****;dbname=******;charset=utf8', '*****', '*****');

  if($_SERVER["REQUEST_METHOD"] == "POST")
  {
    // username and password sent from Form
    $prepared = array(
      'username' => $_POST['username'],
      'password' => $_POST['password']);
    $stmt = $db->prepare("SELECT userID FROM miembros WHERE user=:username and  pass=:password AND confirm IS NULL");
    $result = $stmt->execute($prepared);
    $row = $result->fetch(PDO::FETCH_ASSOC);
    $count = $result->rowCount();
  }