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<?php
/**
* MySQL layer and helper class
*
* Zed. The immensity of stars. The HyperShip. The people.
*
* (c) 2010, Dereckson, some rights reserved.
* Released under BSD license.
*
* @package Zed
* @subpackage Keruald
* @author Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
* @copyright 2010 Sébastien Santoro aka Dereckson
* @license http://www.opensource.org/licenses/bsd-license.php BSD
* @version 0.1
* @link http://scherzo.dereckson.be/doc/zed
* @link http://zed.dereckson.be/
* @filesource
*/
if (!defined('SQL_LAYER')) {
/**
* Defines the SQL engine layer implented for our SQL abstraction class:
* MySQL
*/
define('SQL_LAYER', 'mysql');
/**
* SQL database class
*
* This is the MySQL implementation of our SQL abstraction layer
*/
class sql_db {
/*
* @var int the connection identifier
*/
private $id;
/**
* Initializes a new instance of the database abstraction class, for MySQL engine
*
* @param string $host the SQL server to connect [optionnal, by default localhost]
* @param string $username the SQL username [optionnal, by default root]
* @param string $password the SQL password [optionnal, by default blank]
* @param string $database the database to select [optionnal]
*/
function __construct($host = 'localhost', $username = 'root', $password = '' , $database = '') {
//Connects to the MySQL server
$this->id = @mysql_connect($host, $username, $password) or $this->sql_die(); //or die ("Can't connect to SQL server.");
//Selects database
if ($database != '') {
mysql_select_db($database, $this->id);
}
}
/**
* Outputs a can't connect to the SQL server message and exits.
* It's called on connect failure
*/
function sql_die () {
//You can custom here code when you can't connect to SQL server
//e.g. in a demo or appliance context, include('start.html'); exit;
//die ("Can't connect to SQL server.");
include('start.html');
exit;
}
/**
* Sends a unique query to the database
*
* @param string $query the query to execute
* @return resource if the query is successful, a resource identifier ; otherwise, false
*/
function sql_query ($query) {
return mysql_query($query, $this->id);
}
/**
* Fetches a row of result into an associative array
*
* @param resource $result The result that is being evaluated, from sql_query
* @return array an associative array with columns names as keys and row values as values
*/
function sql_fetchrow ($result) {
return mysql_fetch_array($result);
}
/**
* Gets last SQL error information
*
* @return array an array with two keys, code and message, containing error information
*/
function sql_error () {
$error['code'] = mysql_errno($this->id);
$error['message'] = mysql_error($this->id);
return $error;
}
/**
* Gets the number of rows affected or returned by a query
*
* @return int the number of rows affected (delete/insert/update) or the number of rows in query result
*/
function sql_numrows ($result) {
return mysql_num_rows($result);
}
/**
* Gets the primary key value of the last query (works only in INSERT context)
*
* @return int the primary key value
*/
function sql_nextid () {
return mysql_insert_id($this->id);
}
/**
* Express query method, returns an immediate and unique result
*
* @param string $query the query to execute
* @param string $error_message the error message
* @param boolean $return_as_string return result as string, and not as an array
* @return mixed the row or the scalar result
*/
function sql_query_express ($query = '', $error_message = "Impossible d'exécuter cette requête.", $return_as_string = true) {
if ($query === '' || $query === false || $query === null) {
//No query, no value
return '';
} elseif (!$result = $this->sql_query($query)) {
message_die(SQL_ERROR, $error_message, '', __LINE__, __FILE__, $query);
} else {
//Fetches row
$row = $this->sql_fetchrow($result);
//If $return_as_string is true, returns first query item (scalar mode) ; otherwise, returns row
return $return_as_string ? $row[0] : $row;
}
}
/**
* Escapes a SQL expression
*
* @param string $expression The expression to escape
* @return string The escaped expression
*/
function sql_escape ($expression) {
return mysql_real_escape_string($expression);
}
/*
* Sets the client character set (requires MySQL 5.0.7+).
*
* @param string $encoding the charset encoding to set
*/
function set_charset ($encoding) {
if (function_exists('mysql_set_charset')) {
//>=PHP 5.2.3
mysql_set_charset($encoding, $this->id);
} else {
//Old PHP version
$this->sql_query("SET NAMES '$encoding'");
}
}
}
/**
* The main sql_db instance
*
* @global sql_db $db
*/
$db = new sql_db($Config['sql']['host'], $Config['sql']['username'], $Config['sql']['password'], $Config['sql']['database']);
$db->set_charset('utf8');
//By security, we unset the SQL parameters, so you can safely output Zed
//config parts (there's still the problem of the secret key, but it's less
//a security problem than database password)
unset($Config['sql']);
}
?>

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