Phpmyadmin Couldn't find database, mi lehet a gond?

amikor benyomom a login gombot azt irja ki hogy "Couldn't find database!" és nem értem hogy miért.

Itt a php:

?php

session_start();

$username = $_POST['username'];

$password = $_POST['password'];

if ($username&&$password)

{

$connect = mysql_connect("localhost", "root", "") or die("Couldn't connect to host!");

mysql_select_db("logindb") or die("Couldn't find database!");

$query = mysql_query("SELECT * FROM logindb WHERE username ='$username'");

$numrows = mysql_num_rows($query);

if ($numrows!=0)

{

while ($row = mysql_fetch_assoc($query))

{

$dbusername = $row['username'];

$dbpassword = $row['password'];

}

if($username==$dbusername&&$password==$dbpassword)

{

$_SESSION['username']=$username;

header("Location: member.php");

}

else

{

echo "Wrong password!";

}

}

else

{

die("That user hasn't been created!");

}

}

else

{

echo "Username and password must be entered!";

}

?>