Question

I am trying to take a variable passed from another page and use it in a PDO query. The variable is the date the record was added and I’m trying to return all the newer records. Do I use $_POST for this in PDO?

<?php
require_once('globals.php');

$date_added = $_POST['date_added'];

$sth = $dbh->prepare("SELECT * FROM games WHERE date_added > $date_added");
$sth->execute();

/* Fetch all of the remaining rows in the result set */
print("Fetch all of the remaining rows in the result set:\n");
$result = $sth->fetchAll();
print_r($result);


?>

Answer 1

You need to actually establish a connection to the database by creating a new PDO object into $dbh. The code below assumes a database user and password as $dbusername, $dbpassword and database named $nameofdb.

$date_added is replaced in the prepare() call with a parameter :dateadded, then passed via an array to the execute() call.

Please read the documentation on both PDO::__construct() and PDO::execute()

<?php
require_once('globals.php');

// Connect to MySQL via PDO
try {
    $dbh = new PDO("mysql:dbname=$nameofdb;host=localhost", $dbusername, $dbpassword);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

$date_added = $_POST['date_added'];

// Replace `$date_added` with a parameter `:dateadded`
$sth = $dbh->prepare("SELECT * FROM games WHERE date_added > :dateadded");
// bind $date_added and pass it into the execute() call inside an array
$sth->execute(array('dateadded'=>$date_added));

/* Fetch all of the remaining rows in the result set */
print("Fetch all of the remaining rows in the result set:\n");
$result = $sth->fetchAll();
print_r($result);

?>