PDO get data from database

Question

I started using PDO recently, earlier I was using just MySQL. Now I am trying to get all data from database.

$getUsers = $DBH->prepare(\"SELECT * FROM use         


        

Answer 1

Your code is missing a call to execute() after prepare(). After your prepared statement is executed you can get the array of records using fetchAll().

$getUsers = $DBH->prepare('SELECT * FROM users ORDER BY id ASC');
$getUsers->execute();
$users = $getUsers->fetchAll();

// Then in your presentation logic you can use the following code to display the data:
if ($users) {
    foreach ($users as $user) {
        echo $user['username']."
";
    }
} else {
    // Whatever your requirement is to handle the no user case, do it here.
    echo 'Error: No users.';
}

However, in you example you are not passing any variable data to the query and you only execute it once, which defeats a purpose of having prepared statement. You should use prepared statements if you need to have variables in your SQL, for example:

$getUsers = $DBH->prepare('SELECT * FROM users WHERE id=?');
$getUsers->execute([
    $_GET['user_id']
]);
$user = $getUsers->fetch();     // get single user by unique id

If there are no variables then you can simply use query() method.

$users = $DBH->query('SELECT * FROM users ORDER BY id ASC')->fetchAll();

If you do not need to fetch all records at once, you can simply loop on the statement with foreach:

$getUsers = $DBH->prepare('SELECT * FROM users WHERE username LIKE ? ORDER BY id ASC');
$getUsers->execute([
    '%' . $_GET['search'] . '%'     // search for username with wildcards
]);

foreach ($getUsers as $user) {
    echo $user['username']."
";
}