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db.class.php
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db.class.php
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<?php
namespace Geeklog;
/**
* Class Db
*
* @package Geeklog
*/
abstract class Db
{
const DB_MYSQL = 'mysql';
const DB_MYSQLI = 'mysqli';
const DB_POSTGRES = 'postgres';
/**
* @var Db
*/
private static $engine = null;
/**
* @var array
*/
protected $args = array();
/**
* Return a list of available PHP's database extensions
*
* @param bool $onlyMysql
* @return array
*/
public static function getDrivers($onlyMysql = true)
{
$retval = array();
if (is_callable('mysql_connect')) {
$retval[] = self::DB_MYSQL;
}
if (is_callable('mysqli_connect')) {
$retval[] = self::DB_MYSQLI;
}
if (!$onlyMysql && is_callable('pg_connect')) {
$retval[] = self::DB_POSTGRES;
}
return $retval;
}
/**
* Convert Geeklog's $_CONF['default_charset'] to MySQL's charset
*
* @param string $charset
* @return string
*/
public function fixMysqlCharset($charset)
{
$charset = strtolower($charset);
$charset = preg_replace('/[^0-9a-z]/', '', $charset);
return $charset;
}
/**
* Connect to database driver
*
* @param string $type
* @param array $args
* @return Db
*/
public final static function connect($type, array $args)
{
try {
switch ($type) {
case self::DB_MYSQL:
require_once __DIR__ . '/mysql.class.php';
self::$engine = new Db_Mysql($args);
break;
case self::DB_MYSQLI:
require_once __DIR__ . '/mysqli.class.php';
self::$engine = new Db_Mysqli($args);
break;
case self::DB_POSTGRES:
require_once __DIR__ . '/pgsql.class.php';
self::$engine = new Db_Pgsql($args);
break;
default:
throw new \Exception(__METHOD__ . ': unknown database type "' . $type . '" was given.');
break;
}
$retval = self::$engine;
} catch (\Exception $e) {
$retval = null;
}
return $retval;
}
/**
* Perform a query
*
* @param string $sql
* @return mixed
*/
abstract public function query($sql);
/**
* Return error message
*
* @return string
*/
abstract public function error();
/**
* Return server version
*
* @return int
*/
abstract public function getVersion();
}