PHP/MySQL Sample Database Class

[sourcecode language="php"]
<?php
class MySqlDatabase
{
private $_connection;
public $last_query;
private $magic_quotes_active;
private $real_escape_string_exists;

public function __construct()
{
$this->open_connection();
/* Returns the current configuration setting of magic_quotes_gpc.
Returns 0 if magic_quotes_gpc is off, 1 otherwise. */
$this->magic_quotes_active = get_magic_quotes_gpc();
$this->real_escape_string_exists = function_exists("mysql_real_escape_string");
}

public function open_connection()
{
$this->_connection = mysql_connect(DB_SERVER,DB_USER,DB_PASS);
if(!$this->_connection)
{
die('Database connection failed'.mysql_error());
}
else
{
$db_select = mysql_select_db(DB_NAME,$this->_connection);
if(!$db_select)
{
die('Database selection failed'.mysql_error());
}
}
}

public function close_connection()
{
if(isset($this->_connection))
{
mysql_close($this->_connection);
unset($this->_connection);
}
}

/* For SELECT returns resultset on success, false on error.
* For INSERT, UPDATE, DELETE etc returns true on success, false on error */
public function query($sql)
{
$this->last_query = $sql;

$result = mysql_query($sql,$this->_connection);
$this->confirm_query($result);
return $result;
}

/* Make sure query executed successfully.
* Only for debugging purposes. */
private function confirm_query($result)
{

if(!$result)
{
$output = "Databse query failed".mysql_error()."<br>";
$output .= "Last query ".$this->last_query;

die($output);
}
}

/* Escape special characters in the string before sending to the database
* Consider PHP Version*/
public function escape_value($value)
{

if($this->real_escape_string_exists)// PHP version 4.3.0 or higher
{

if($this->magic_quotes_active)
{
/* Automatically add back slashes when magic quotes are active in php.ini
* First remove them. */
$value = stripslashes($value);
}
//Escapes special characters in a string
$value = mysql_real_escape_string($value);
}
else //before PHP version 4.3.0
{

if(!$this->magic_quotes_active)
{
// Add slashes manually
$value = addslashes($value);
}
}

return $value;
}

/* Returns an array of strings that corresponds to the fetched row.
* Returns FALSE if there are no more rows.*/
public function fetch_array($result_set)
{
return mysql_fetch_array($result_set);
}

/* Retrives the number of rows from the result set.
* Returns FALSE on failure. */
public function num_rows($result_set)
{
return mysql_num_rows($result_set);
}

/* Get the ID generated in the last query
* 0 if the previous query does not generate an AUTO_INCREMENT value.
* FALSE if no MySQL connection was established.  */
public function insert_id()
{
return mysql_insert_id($this->_connection);
}

/* Get number of affected rows in previous MySQL operation.
* Return -1 if the last query failed.  */
public function affected_rows()
{
return mysql_affected_rows($this->_connection);
}

}
//Creates an object from MySQLDatabase class
$gdbObj = new MySqlDatabase();
?>
[/sourcecode]