Занесение в таблицу рандомного числа, но оно не должно повторятся

while($row = mysql_fetch_assoc($res)) {
    $rand_int = rand(1, 1000);
    if($rand_int == $row['int']){
          $rand_int = rand(1, 1000);
    } else {
          $rand_int // можно делать insert 
    }
}

while(true)
{
    $rand_int = rand(1, 1000);
    $query = "SELECT int FROM table WHERE int = $rand_int";
    $result = mysql_query($query) or die (mysql_error());
    if (!mysql_num_rows($result))
    {
        $query = "INSERT INTO table SET int = $rand_int";
        mysql_query($query) or die(mysql_error());
        break;
    }
}

while(true)
{
    $rand_int = mt_rand(1, 1000);
    $query = "SELECT COUNT(1) FROM `table` WHERE `int` = $rand_int";
    $result = mysql_query($query) or die (mysql_error());
    if (!mysql_fetch_array($result, MYSQL_NUM))
    {
        $query = "INSERT INTO `table` SET `int` = $rand_int";
        mysql_query($query) or die(mysql_error());
        break;
    }
}

while(true)
{
    $rand_int = mt_rand(1, 1000);
    $query = "INSERT IGNORE INTO `table` SET `int` = $rand_int";
    mysql_query($query) or die (mysql_error());
    if (1 === mysql_affected_rows())
        break;
}

$query = "SELECT `int` FROM `table`";
$result = mysql_query($query) or die (mysql_error());
while($row = mysql_fetch_array($result, MYSQL_NUM))
    $ints[] = (int) $result[0];
while(in_array(($rand_int = mt_rand(1, 1000)), $ints, true))
    ;
$query = "INSERT INTO `table` SET `int` = $rand_int";
mysql_query($query) or die(mysql_error());