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<?php
require_once "includes/conf/mysql.conf.php";
class Database
{
// implement singleton pattern
static private $instance = null;
private $conn;
static public function getInstance()
{
if (null === self::$instance)
{
self::$instance = new self;
}
return self::$instance;
}
// ctor
private function __construct()
{
global $conf;
$this->conn = mysql_connect( $conf['mysql_hostname'],
$conf['mysql_username'],
$conf['mysql_password'] )
or die ("Connection to database failed!" . mysql_error());
mysql_select_db( $conf['mysql_database'], $this->conn )
or die ("Selection of database failed! " . mysql_error());
}
private function checkConnect()
{
if (!isset($this->conn))
{
die("Not connected to database");
}
}
// returns the value in the first row and column
public function getValue( $sql )
{
$this->checkConnect();
$res = mysql_query( $sql, $this->conn );
if (!$res)
{
die('Error while calling database: ' . mysql_error());
}
$vals = mysql_fetch_row( $res );
mysql_free_result( $res );
return $vals[0];
}
// executes some sql and returns affected rows
public function exec( $sql )
{
$this->checkConnect();
$res = mysql_query( $sql, $this->conn );
if (!$res)
{
die('Error while calling database: ' . mysql_error());
}
$numrows = mysql_affected_rows( $this->conn );
return $numrows;
}
public function escape( $string )
{
$this->checkConnect();
return mysql_real_escape_string( $string, $this->conn );
}
public function disconnect()
{
if ( mysql_ping( $this->conn ) )
{
mysql_close( $this->conn );
}
}
}
?>
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