Revert "db: use builtin classloader, lowercase class files"

This reverts commit 57b8469e67.

classes/Db/Abstract.php

@@ -0,0 +1,56 @@
+<?php
+
+abstract class Db_Abstract implements Db_Interface
+{
+    private $dbconn;
+    protected static $instance;
+
+    private function __construct() { }
+
+    public static function instance()
+    {
+        if (is_null(static::$instance)) {
+            static::$instance = new static();
+        }
+
+        return static::$instance;
+    }
+
+    public function connect($host, $user, $pass, $db) { }
+
+    public function getLink()
+    {
+        return $this->dbconn;
+    }
+
+    public function init() { }
+
+    public function escape_string($s, $strip_tags = true) { }
+
+    public function query($query, $die_on_error = true) { }
+
+    public function fetch_assoc($result) { }
+
+    public function num_rows($result) { }
+
+    public function fetch_result($result, $row, $param) { }
+
+    public function unescape_string($str)
+    {
+        $tmp = str_replace("\\\"", "\"", $str);
+        $tmp = str_replace("\\'", "'", $tmp);
+        return $tmp;
+    }
+
+    public function close() { }
+
+    public function affected_rows($result) { }
+
+    public function last_error() { }
+
+    public function quote($str)
+    {
+        return("'$str'");
+    }
+
+}