Error messages when connecting to database - php

Question

I'm having trouble connection to the database
Here is the code I am using
$con = mysql_connect('host', 'user', 'pass');
mysql_select_db('database_name', $con);
And here is the results I get
Warning: mysql_connect() [function.mysql-connect]: Lost connection to MySQL server at 'reading initial communication packet', system error: 111 in /home/heartbeat_db/heartbeatsmart.com/php/config/dbconnect.php on line 2
Warning: mysql_select_db() expects parameter 2 to be resource, boolean given in /home/heartbeat_db/heartbeatsmart.com/php/config/dbconnect.php on line 3
Warning: mysql_connect() [function.mysql-connect]: Lost connection to MySQL server at 'reading initial communication packet', system error: 111 in /home/heartbeat_db/heartbeatsmart.com/php/config/dbconnect.php on line 2
Warning: mysql_select_db() expects parameter 2 to be resource, boolean given in /home/heartbeat_db/heartbeatsmart.com/php/config/dbconnect.php on line 3

Answer 1

try using this code
$con=mysql_connect("host","user","pass");
mysql_selectdb("database_name",$con);

Answer 2

It's better to use PDO or Mysqli. I prefer PDO because it also supports other databases than mysql so you can easier migrate if necessary.
You can easily make a connection through
$db = new PDO('mysql:host=localhost;dbname=<SOMEDB>', '<USERNAME>', 'PASSWORD');
For more information: http://php.net/manual/en/book.pdo.php
If you want to use mysqli use:
$mysqli = new mysqli("localhost", "user", "password", "database");

Answer 3

Try using this code
$link = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');
if (!$link) {
die('Connect Error (' . mysqli_connect_errno() . ') '
. mysqli_connect_error());
}
echo 'Success... ' . mysqli_get_host_info($link) . "\n";
mysqli_close($link);
Source: http://www.php.net/manual/en/mysqli.construct.php

Answer 4

<?php
$mysqli = new mysqli("localhost", "user", "password", "database");
if ($mysqli->connect_errno) {
echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
}
echo $mysqli->host_info . "\n";
$mysqli = new mysqli("127.0.0.1", "user", "password", "database", 3306);
if ($mysqli->connect_errno) {
echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
}
echo $mysqli->host_info . "\n";
?>

Answer 5

$con = mysql_connect('host', 'user', 'password');
if (!$con) {
die('Not connected : ' . mysql_error());
}
$db = mysql_select_db('database_name', $con);
if (!$db) {
die ('Can\'t use database_name : ' . mysql_error());
}