PHP PDO操作mysql不注意的话依然存在SQL注入

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<?php 
dbh = new PDO("mysql:host=localhost; dbname=demo", "user", "pass");
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); 
$dbh->exec("set names 'utf8'");
$sql="select * from test where name = ? and password = ?";
$stmt = $dbh->prepare($sql);
$exeres = $stmt->execute(array($name, $pass));