PHP Error: No database selected (Hostgator.com) - php

Question

I have a problem with inserting data to MySQL with PHP.
When I run this code on my Hostgator hosting I get error like this:
No database selected
Here is my code:
$dbh= mysql_connect("localhost", $username, $password);
// or die ('I cannot connect to the database because: ' . mysql_error());
if(!$dbh)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("contafe_tipster", $dbh);
//$conn = mysqli_connect($servername, $username, $password, $dbname);
//Check connection
/*
if (!$conn) {
// Connection failed return 0
//die("Connection failed " . mysqli_connect_error());
echo "1";
}
*/
//Posted parameters
$pName = $_POST['name'];
$pCountry = $_POST['country'];
$pCity = $_POST['city'];
$pLocationX = $_POST['locationX'];
$pLocationY = $_POST['locationY'];
$pDescription = $_POST['description'];
$pMobileNumber = $_POST['mobile'];
$pOtherNumber = $_POST['phone'];
$pOpens = $_POST['opens'];
$pCloses = $_POST['closes'];
$add_DB = "INSERT INTO Places (Id, Name, Country, City, LocationX, LocationY, Description, Mobile, Phone, Opens, Closes)
VALUES(NULL, '$pName', '$pCountry', '$pCity', '$pLocationX', '$pLocationY', '$pDescription', '$pMobileNumber', '$pOtherNumber', '$pOpens', '$pCloses')";
if (mysql_query($add_DB, $dbh)) {
//if success return 1
echo "0";
}
else {
//if error return -1
//echo "2";
die('Error: ' . mysql_error());
}
mysql_close($dbh);

Answer 1

Are you sure that db name is correct?
Try this way of connection with db:
mysql_connect ($dbhost,$dblogin,$dbpass) or die ("Can't connect to database");
mysql_select_db($db) or die ('Wrong databse!');