$ sth->的execute（）返回false

Question

我有这样的代码：

$dbh = new PDO("mysql:host=$dbHost;dbname=$dbName", $dbUser, $dbPassword); 
$sth = $dbh->prepare(" SELECT `login`, `password` FROM `admins` WHERE `login` = ?, `password` = ? "); 
var_dump($sth->bindParam(1, $login)); // true 
var_dump($sth->bindParam(2, $password)); // true 
var_dump($sth->execute()); // false 

Answer 1

WHERE `login` = ?, `password` = ? 

应该不就是......

WHERE `login` = ? and `password` = ?