diff --git a/classes/Db/Abstract.php b/classes/Db/Abstract.php
new file mode 100644
index 00000000..d84701fd
--- /dev/null
+++ b/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'");
+    }
+
+}
\ No newline at end of file
diff --git a/classes/Db/Interface.php b/classes/Db/Interface.php
new file mode 100644
index 00000000..c5bfad56
--- /dev/null
+++ b/classes/Db/Interface.php
@@ -0,0 +1,18 @@
+<?php
+
+interface Db_Interface
+{
+    public function connect($host, $user, $pass, $db);
+    public function getLink();
+    public function init();
+    public function escape_string($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);
+    public function close();
+    public function affected_rows($result);
+    public function last_error();
+    public function quote($str);
+}
diff --git a/classes/Db/Mysql.php b/classes/Db/Mysql.php
new file mode 100644
index 00000000..17062830
--- /dev/null
+++ b/classes/Db/Mysql.php
@@ -0,0 +1,71 @@
+<?php
+
+class Db_Mysql extends Db_Abstract
+{
+    public function connect($host, $user, $pass, $db)
+    {
+        $link = mysql_connect($host, $user, $pass);
+        if ($link) {
+            $result = mysql_select_db($db, $link);
+            if (!$result) {
+                die("Can't select DB: " . mysql_error($link));
+            }
+            $this->dbconn = $link;
+            return $link;
+        } else {
+            die("Unable to connect to database (as $user to $host, database $db): " . mysql_error());
+        }
+    }
+
+    public function init()
+    {
+        db_query($this->dbconn, "SET time_zone = '+0:0'");
+
+        if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
+            db_query($this->dbconn, "SET NAMES " . MYSQL_CHARSET);
+        }
+    }
+
+    public function escape_string($s, $strip_tags = true)
+    {
+        if ($strip_tags) $s = strip_tags($s);
+        return mysql_real_escape_string($s);
+    }
+
+    public function query($query, $die_on_error = true)
+    {
+        $result = mysql_query($query, $this->dbconn);
+        if (!$result) {
+            $query = htmlspecialchars($query);
+            if ($die_on_error) {
+                die("Query <i>$query</i> failed: " . ($this->dbconn ? mysql_error($this->dbconn) : "No connection"));
+            }
+        }
+        return $result;
+    }
+
+    public function fetch_assoc($result) {
+        return mysql_fetch_assoc($result);
+    }
+
+    public function num_rows($result) {
+        return mysql_num_rows($result);
+    }
+
+    public function fetch_result($result, $row, $param) {
+        // I hate incoherent naming of PHP functions
+        return mysql_result($result, $row, $param);
+    }
+
+    public function close() {
+        return mysql_close($this->dbconn);
+    }
+
+    public function affected_rows($result) {
+        return mysql_affected_rows($this->dbconn);
+    }
+
+    public function last_error() {
+        return mysql_error($this->dbconn);
+    }
+}
diff --git a/classes/Db/Pgsql.php b/classes/Db/Pgsql.php
new file mode 100644
index 00000000..39ed181d
--- /dev/null
+++ b/classes/Db/Pgsql.php
@@ -0,0 +1,80 @@
+<?php
+
+class Db_Pgsql extends Db_Abstract
+{
+    public function connect($host, $user, $pass, $db)
+    {
+        $string = "dbname=$db user=$user";
+
+        if ($pass) {
+            $string .= " password=$pass";
+        }
+
+        if ($host) {
+            $string .= " host=$host";
+        }
+
+        if (defined('DB_PORT')) {
+            $string = "$string port=" . DB_PORT;
+        }
+
+        $link = pg_connect($string);
+
+        if (!$link) {
+            die("Unable to connect to database (as $user to $host, database $db):" . pg_last_error());
+        }
+
+        $this->dbconn = $link;
+        return $link;
+    }
+
+    public function init()
+    {
+        pg_query($this->dbconn, "set client_encoding = 'UTF-8'");
+        pg_set_client_encoding("UNICODE");
+        pg_query($this->dbconn, "set datestyle = 'ISO, european'");
+        pg_query($this->dbconn, "set TIME ZONE 0");
+    }
+
+    public function escape_string($s, $strip_tags = true)
+    {
+        if ($strip_tags) $s = strip_tags($s);
+        return pg_escape_string($s);
+    }
+
+    public function query($query, $die_on_error = true)
+    {
+        $result = pg_query($this->dbconn, $query);
+        if (!$result) {
+            $query = htmlspecialchars($query); // just in case
+            if ($die_on_error) {
+                die("Query <i>$query</i> failed [$result]: " . ($this->dbconn ? pg_last_error($this->dbconn) : "No connection"));
+            }
+        }
+        return $result;
+    }
+
+    public function fetch_assoc($result) {
+        return pg_fetch_assoc($result);
+    }
+
+    public function num_rows($result) {
+        return pg_num_rows($result);
+    }
+
+    public function fetch_result($result, $row, $param) {
+        return pg_fetch_result($result, $row, $param);
+    }
+
+    public function close() {
+        return pg_close($this->dbconn);
+    }
+
+    public function affected_rows($result) {
+        return pg_affected_rows($result);
+    }
+
+    public function last_error() {
+        return pg_last_error($this->dbconn);
+    }
+}
diff --git a/classes/sanitizedummy.php b/classes/sanitizedummy.php
index a184bec3..7182fb7f 100644
--- a/classes/sanitizedummy.php
+++ b/classes/sanitizedummy.php
@@ -1,6 +1,6 @@
 <?php
 class SanitizeDummy extends SimplePie_Sanitize {
-	function sanitize($data, $type, $base) {
+	function sanitize($data, $type, $base = '') {
 		return $data;
 	}
 }
diff --git a/include/db.php b/include/db.php
index f1a7af36..28718fb0 100644
--- a/include/db.php
+++ b/include/db.php
@@ -2,137 +2,68 @@
 
 require_once "config.php";
 
-function db_connect($host, $user, $pass, $db) {
-	if (DB_TYPE == "pgsql") {
+$db_class = 'Db_'.ucfirst(DB_TYPE);
+$db_class_file = 'classes/' . str_replace('_', '/', $db_class) . '.php';
 
-		$string = "dbname=$db user=$user";
+require_once "classes/Db/Interface.php";
+require_once "classes/Db/Abstract.php";
+require_once $db_class_file;
 
-		if ($pass) {
-			$string .= " password=$pass";
-		}
+$db = $db_class::instance(); //  call_user_func(array($db_class, 'instance'));
 
-		if ($host) {
-			$string .= " host=$host";
-		}
-
-		if (defined('DB_PORT')) {
-			$string = "$string port=" . DB_PORT;
-		}
-
-		$link = pg_connect($string);
-
-		if (!$link) {
-			die("Unable to connect to database (as $user to $host, database $db):" . pg_last_error());
-		}
-
-		return $link;
-
-	} else if (DB_TYPE == "mysql") {
-		$link = mysql_connect($host, $user, $pass);
-		if ($link) {
-			$result = mysql_select_db($db, $link);
-			if (!$result) {
-				die("Can't select DB: " . mysql_error($link));
-			}
-			return $link;
-		} else {
-			die("Unable to connect to database (as $user to $host, database $db): " . mysql_error());
-		}
-	}
+function db_connect($host, $user, $pass, $db_name) {
+    global $db;
+    return $db->connect($host, $user, $pass, $db_name);
 }
 
 function db_escape_string($s, $strip_tags = true) {
-	if ($strip_tags) $s = strip_tags($s);
-
-	if (DB_TYPE == "pgsql") {
-		return pg_escape_string($s);
-	} else {
-		return mysql_real_escape_string($s);
-	}
+    global $db;
+    return $db->escape_string($s, $strip_tags);
 }
 
 function db_query($link, $query, $die_on_error = true) {
-	if (DB_TYPE == "pgsql") {
-		$result = pg_query($link, $query);
-		if (!$result) {
-			$query = htmlspecialchars($query); // just in case
-			if ($die_on_error) {
-				die("Query <i>$query</i> failed [$result]: " . ($link ? pg_last_error($link) : "No connection"));
-			}
-		}
-		return $result;
-	} else if (DB_TYPE == "mysql") {
-		$result = mysql_query($query, $link);
-		if (!$result) {
-			$query = htmlspecialchars($query);
-			if ($die_on_error) {
-				die("Query <i>$query</i> failed: " . ($link ? mysql_error($link) : "No connection"));
-			}
-		}
-		return $result;
-	}
+    global $db;
+    return $db->query($query, $die_on_error);
 }
 
 function db_fetch_assoc($result) {
-	if (DB_TYPE == "pgsql") {
-		return pg_fetch_assoc($result);
-	} else if (DB_TYPE == "mysql") {
-		return mysql_fetch_assoc($result);
-	}
+    global $db;
+    return $db->fetch_assoc($result);
 }
 
-
 function db_num_rows($result) {
-	if (DB_TYPE == "pgsql") {
-		return pg_num_rows($result);
-	} else if (DB_TYPE == "mysql") {
-		return mysql_num_rows($result);
-	}
+    global $db;
+    return $db->num_rows($result);
 }
 
 function db_fetch_result($result, $row, $param) {
-	if (DB_TYPE == "pgsql") {
-		return pg_fetch_result($result, $row, $param);
-	} else if (DB_TYPE == "mysql") {
-		// I hate incoherent naming of PHP functions
-		return mysql_result($result, $row, $param);
-	}
+    global $db;
+    return $db->fetch_result($result, $row, $param);
 }
 
 function db_unescape_string($str) {
-	$tmp = str_replace("\\\"", "\"", $str);
-	$tmp = str_replace("\\'", "'", $tmp);
-	return $tmp;
+    global $db;
+    return $db->unescape_string($str);
 }
 
 function db_close($link) {
-	if (DB_TYPE == "pgsql") {
-
-		return pg_close($link);
-
-	} else if (DB_TYPE == "mysql") {
-		return mysql_close($link);
-	}
+    global $db;
+    return $db->close();
 }
 
 function db_affected_rows($link, $result) {
-	if (DB_TYPE == "pgsql") {
-		return pg_affected_rows($result);
-	} else if (DB_TYPE == "mysql") {
-		return mysql_affected_rows($link);
-	}
+    global $db;
+    return $db->affected_rows($result);
 }
 
 function db_last_error($link) {
-	if (DB_TYPE == "pgsql") {
-		return pg_last_error($link);
-	} else if (DB_TYPE == "mysql") {
-		return mysql_error($link);
-	}
+    global $db;
+    return $db->last_error();
 }
 
 function db_quote($str){
-	return("'$str'");
+    global $db;
+    return $db->quote($str);
 }
 
-?>
+?>
\ No newline at end of file
diff --git a/include/functions.php b/include/functions.php
index 54b84032..4dc286eb 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -6,14 +6,17 @@
 	$pluginhost = false;
 
 	function __autoload($class) {
-		$class_file = str_replace("_", "/", strtolower(basename($class)));
+		$class_file1 = str_replace("_", "/", basename($class));   // PSR-0
+		$class_file2 = str_replace("_", "/", strtolower(basename($class)));
 
-		$file = dirname(__FILE__)."/../classes/$class_file.php";
+		$file1 = dirname(__FILE__)."/../classes/$class_file1.php";
+		$file2 = dirname(__FILE__)."/../classes/$class_file2.php";
 
-		if (file_exists($file)) {
-			require $file;
+		if (file_exists($file1)) {
+			require $file1;
+		} elseif (file_exists($file2)) {
+			require $file2;
 		}
-
 	}
 
 	mb_internal_encoding("UTF-8");
@@ -199,8 +202,6 @@
 					ttrss_entries.date_updated < NOW() - INTERVAL '$purge_interval days'");
 			}
 
-			$rows = pg_affected_rows($result);
-
 		} else {
 
 /*			$result = db_query($link, "DELETE FROM ttrss_user_entries WHERE
@@ -216,9 +217,8 @@
 				$query_limit
 				ttrss_entries.date_updated < DATE_SUB(NOW(), INTERVAL $purge_interval DAY)");
 
-			$rows = mysql_affected_rows($link);
-
 		}
+		$rows = db_affected_rows($link, $result);
 
 		ccache_update($link, $feed_id, $owner_uid);
 
@@ -952,7 +952,7 @@
 	}
 
 	function sql_random_function() {
-		if (DB_TYPE == "mysql") {
+        if (DB_TYPE == "mysql") {
 			return "RAND()";
 		} else {
 			return "RANDOM()";
@@ -3208,24 +3208,13 @@
 	}
 
 	function init_connection($link) {
-		if ($link) {
-
-			if (DB_TYPE == "pgsql") {
-				pg_query($link, "set client_encoding = 'UTF-8'");
-				pg_set_client_encoding("UNICODE");
-				pg_query($link, "set datestyle = 'ISO, european'");
-				pg_query($link, "set TIME ZONE 0");
-			} else {
-				db_query($link, "SET time_zone = '+0:0'");
-
-				if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
-					db_query($link, "SET NAMES " . MYSQL_CHARSET);
-				}
-			}
+		global $db;
+		if ($db) {
+			$db->init();
 
 			global $pluginhost;
 
-			$pluginhost = new PluginHost($link);
+			$pluginhost = new PluginHost($db->getLink());
 			$pluginhost->load(PLUGINS, $pluginhost::KIND_ALL);
 
 			return true;
@@ -3914,4 +3903,4 @@
 		return in_array($interface, class_implements($class));
 	}
 
-?>
+?>
\ No newline at end of file