diff --git a/appinfo/app.php b/appinfo/app.php
--- a/appinfo/app.php
+++ b/appinfo/app.php
@@ -1,49 +1,50 @@
 <?php
 
 /**
 * ownCloud - user_sql
 *
 * @author Andreas Böhler
 * @copyright 2012 Andreas Böhler <andreas (at) aboehler (dot) at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
 require_once('apps/user_sql/user_sql.php');
 
 OC_App::registerAdmin('user_sql','settings');
 
 // define IMAP_DEFAULTs
 define('OC_USER_BACKEND_SQL_DEFAULT_HOST', 'localhost');
 define('OC_USER_BACKEND_SQL_DEFAULT_USER', 'mail_admin');
 define('OC_USER_BACKEND_SQL_DEFAULT_DB', 'postfixadmin');
 define('OC_USER_BACKEND_SQL_DEFAULT_PASSWORD', 'password');
 define('OC_USER_BACKEND_SQL_DEFAULT_TABLE', 'users');
 define('OC_USER_BACKEND_SQL_DEFAULT_PW_COLUMN', 'password');
 define('OC_USER_BACKEND_SQL_DEFAULT_USER_COLUMN', 'username');
+define('OC_USER_BACKEND_SQL_DEFAULT_DRIVER', 'mysql');
 
 // register user backend
 OC_User::registerBackend('SQL');
 OC_User::useBackend('SQL');
 
 // add settings page to navigation
 $entry = array(
         'id' => "user_sql_settings",
         'order'=>1,
         'href' => OC_Helper::linkTo( "user_sql", "settings.php" ),
         'name' => 'SQL'
 );
 
 
diff --git a/settings.php b/settings.php
--- a/settings.php
+++ b/settings.php
@@ -1,51 +1,52 @@
 <?php
 
 /**
  * ownCloud - user_sql
  *
  * @author Andreas Böhler
  * @copyright 2012 Andreas Böhler <andreas (at) aboehler (dot) at>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
  * License as published by the Free Software Foundation; either
  * version 3 of the License, or any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
  *
  * You should have received a copy of the GNU Affero General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-$params = array('sql_host', 'sql_user', 'sql_database', 'sql_password', 'sql_table', 'sql_column_username', 'sql_column_password');
+$params = array('sql_host', 'sql_user', 'sql_database', 'sql_password', 'sql_table', 'sql_column_username', 'sql_column_password', 'sql_type');
 
 OCP\Util::addscript('user_sql', 'settings');
 
 if ($_POST) {
        foreach($params as $param){
                if(isset($_POST[$param])){
                        OCP\Config::setAppValue('user_sql', $param, $_POST[$param]);
                }
        }
 }
 
 // fill template
 $tmpl = new OCP\Template( 'user_sql', 'settings');
 foreach($params as $param){
        $value = htmlentities(OCP\Config::getAppValue('user_sql', $param,''));
        $tmpl->assign($param, $value);
 }
 
 // settings with default values
 $tmpl->assign( 'sql_host', OCP\Config::getAppValue('user_sql', 'sql_host', OC_USER_BACKEND_SQL_DEFAULT_HOST));
 $tmpl->assign( 'sql_user', OCP\Config::getAppValue('user_sql', 'sql_user', OC_USER_BACKEND_SQL_DEFAULT_USER));
 $tmpl->assign( 'sql_database', OCP\Config::getAppValue( 'user_sql', 'sql_database', OC_USER_BACKEND_SQL_DEFAULT_DB));
 $tmpl->assign( 'sql_password', OCP\Config::getAppValue( 'user_sql', 'sql_password', OC_USER_BACKEND_SQL_DEFAULT_PASSWORD));
 $tmpl->assign( 'sql_table', OCP\Config::getAppValue( 'user_sql', 'sql_table', OC_USER_BACKEND_SQL_DEFAULT_TABLE));
 $tmpl->assign( 'sql_column_password', OCP\Config::getAppValue( 'user_sql', 'sql_column_password', OC_USER_BACKEND_SQL_DEFAULT_PW_COLUMN));
 $tmpl->assign( 'sql_column_username', OCP\Config::getAppValue( 'user_sql', 'sql_column_username', OC_USER_BACKEND_SQL_DEFAULT_USER_COLUMN));
+$tmpl->assign( 'sql_type', OCP\Config::getAppValue( 'user_sql', 'sql_type', OC_USER_BACKEND_SQL_DEFAULT_DRIVER));
 
 return $tmpl->fetchPage();
diff --git a/templates/settings.php b/templates/settings.php
--- a/templates/settings.php
+++ b/templates/settings.php
@@ -1,14 +1,29 @@
 <form id="sql" action="#" method="post">
-       <fieldset class="personalblock">
-               <legend><?php echo $l->t('SQL'); ?></legend>
-               <p><label for="sql_host"><?php echo $l->t('Host');?></label><input type="text" id="sql_host" name="sql_host" value="<?php echo $_['sql_host']; ?>"></p>
-               <p><label for="sql_user"><?php echo $l->t('Username');?></label><input type="text" id="sql_user" name="sql_user" value="<?php echo $_['sql_user']; ?>" /></p>
-               <p><label for="sql_database"><?php echo $l->t('Database');?></label><input type="text" id="sql_database" name="sql_database" value="<?php echo $_['sql_database']; ?>" /></p>
-               <p><label for="sql_password"><?php echo $l->t('Password');?></label><input type="password" id="sql_password" name="sql_password" value="<?php echo $_['sql_password']; ?>" /></p>
-               <p><label for="sql_table"><?php echo $l->t('Table');?></label><input type="text" id="sql_table" name="sql_table" value="<?php echo $_['sql_table']; ?>" /></p>
-               <p><label for="sql_column_username"><?php echo $l->t('Username Column');?></label><input type="text" id="sql_column_username" name="sql_column_username" value="<?php echo $_['sql_column_username']; ?>" /></p>
-               <p><label for="sql_column_password"><?php echo $l->t('Password Column');?></label><input type="text" id="sql_column_password" name="sql_column_password" value="<?php echo $_['sql_column_password']; ?>" /></p>
+    <fieldset class="personalblock">
+        <legend><?php echo $l->t('SQL'); ?></legend>
+            <p><label for="sql_type"><?php echo $l->t('SQL Driver');?></label>
+                <?php $db_driver = array('mysql' => 'MySQL', 'pgsql' => 'PostgreSQL');?>
+                <select id="sql_type" name="sql_type">
+                    <?php 
+                        foreach ($db_driver as $driver => $name):
+                            echo $_['sql_type'];
+                            if($_['sql_type'] == $driver): ?>
+                                <option selected="selected" value="<?php echo $driver; ?>"><?php echo $name; ?></option>
+                            <?php else: ?>
+                                <option value="<?php echo $driver; ?>"><?php echo $name; ?></option>
+                            <?php endif;
+                        endforeach; ?>
+                </select>
+            </p>
 
-       <input type="submit" value="<?php echo $l->t('Save'); ?>" />
-       </fieldset>
+            <p><label for="sql_host"><?php echo $l->t('Host');?></label><input type="text" id="sql_host" name="sql_host" value="<?php echo $_['sql_host']; ?>"></p>
+            <p><label for="sql_user"><?php echo $l->t('Username');?></label><input type="text" id="sql_user" name="sql_user" value="<?php echo $_['sql_user']; ?>" /></p>
+            <p><label for="sql_database"><?php echo $l->t('Database');?></label><input type="text" id="sql_database" name="sql_database" value="<?php echo $_['sql_database']; ?>" /></p>
+            <p><label for="sql_password"><?php echo $l->t('Password');?></label><input type="password" id="sql_password" name="sql_password" value="<?php echo $_['sql_password']; ?>" /></p>
+            <p><label for="sql_table"><?php echo $l->t('Table');?></label><input type="text" id="sql_table" name="sql_table" value="<?php echo $_['sql_table']; ?>" /></p>
+            <p><label for="sql_column_username"><?php echo $l->t('Username Column');?></label><input type="text" id="sql_column_username" name="sql_column_username" value="<?php echo $_['sql_column_username']; ?>" /></p>
+            <p><label for="sql_column_password"><?php echo $l->t('Password Column');?></label><input type="text" id="sql_column_password" name="sql_column_password" value="<?php echo $_['sql_column_password']; ?>" /></p>
+
+        <input type="submit" value="<?php echo $l->t('Save'); ?>" />
+    </fieldset>
 </form>
diff --git a/user_sql.php b/user_sql.php
--- a/user_sql.php
+++ b/user_sql.php
@@ -1,194 +1,184 @@
 <?php
 
 /**
  * ownCloud - user_sql
  *
  * @author Andreas Böhler
  * @copyright 2012 Andreas Böhler <andreas (at) aboehler (dot) at>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
  * License as published by the Free Software Foundation; either
  * version 3 of the License, or any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
  *
  * You should have received a copy of the GNU Affero General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
 
 class OC_USER_SQL extends OC_User_Backend implements OC_User_Interface {
 
        // cached settings
         protected $sql_host;
         protected $sql_username;
         protected $sql_database;
         protected $sql_password;
         protected $sql_table;
         protected $sql_column_username;
         protected $sql_column_password;
+        protected $sql_type;
+        protected $db_conn;
+        protected $db;
 
-       public function __construct() {
-                $this->sql_host = OCP\Config::getAppValue('user_sql', 'sql_host', '');
-                $this->sql_username = OCP\Config::getAppValue('user_sql', 'sql_user', '');
-                $this->sql_database = OCP\Config::getAppValue('user_sql', 'sql_database', '');
-                $this->sql_password = OCP\Config::getAppValue('user_sql', 'sql_password', '');
-                $this->sql_table = OCP\Config::getAppValue('user_sql', 'sql_table', '');
-                $this->sql_column_username = OCP\Config::getAppValue('user_sql', 'sql_column_username', '');
-                $this->sql_column_password = OCP\Config::getAppValue('user_sql', 'sql_column_password', '');
-       }
+        public function __construct() {
+            $this->db_conn = false;
+            $this->sql_host = OCP\Config::getAppValue('user_sql', 'sql_host', '');
+            $this->sql_username = OCP\Config::getAppValue('user_sql', 'sql_user', '');
+            $this->sql_database = OCP\Config::getAppValue('user_sql', 'sql_database', '');
+            $this->sql_password = OCP\Config::getAppValue('user_sql', 'sql_password', '');
+            $this->sql_table = OCP\Config::getAppValue('user_sql', 'sql_table', '');
+            $this->sql_column_username = OCP\Config::getAppValue('user_sql', 'sql_column_username', '');
+            $this->sql_column_password = OCP\Config::getAppValue('user_sql', 'sql_column_password', '');
+            $this->sql_type = OCP\Config::getAppValue('user_sql', 'sql_type', '');
+            $dsn = $this->sql_type.":host=".$this->sql_host.";dbname=".$this->sql_database;
+            try 
+            {
+                $this->db = new PDO($dsn, $this->sql_username, $this->sql_password);
+                $this->db_conn = true;
+            }
+            catch (PDOException $e) 
+            {
+                OC_Log::write('OC_USER_SQL', 'OC_USER_SQL, Failed to connect to the database: ' . $e->getMessage(), OC_Log::ERROR);
+            }
+            return false;
+        }
 
 	    public function implementsAction($actions) {
 		    return (bool)((OC_USER_BACKEND_CHECK_PASSWORD) & $actions);
 	    }
 
 	    public function createUser() {
             // Can't create user
-            OC_Log::write('OC_USER_SQL', 'Not possible to create local users from web frontend using SQL user backend',3);
+            OC_Log::write('OC_USER_SQL', 'Not possible to create local users from web frontend using SQL user backend', OC_Log::Error);
             return false;
         }
 
         public function deleteUser( $uid ) {
             // Can't delete user
-            OC_Log::write('OC_USER_SQL', 'Not possible to delete local users from web frontend using SQL user backend',3);
+            OC_Log::write('OC_USER_SQL', 'Not possible to delete local users from web frontend using SQL user backend', OC_Log::Error);
             return false;
         }
 
         public function setPassword ( $uid, $password ) {
             // We can't change user password
-            OC_Log::write('OC_USER_SQL', 'Not possible to change password for local users from web frontend using SQL user backend',3);
+            OC_Log::write('OC_USER_SQL', 'Not possible to change password for local users from web frontend using SQL user backend', OC_Log::Error);
             return false;
         }
 
        /**
         * @brief Check if the password is correct
         * @param $uid The username
         * @param $password The password
         * @returns true/false
         *
         * Check if the password is correct without logging in the user
         */
-       public function checkPassword($uid, $password){
-           $db = mysqli_connect ($this->sql_host, $this->sql_username, $this->sql_password);
-           if ($db) 
-           {
-               $success = mysqli_select_db ($db, $this->sql_database);
-               if(!$success)
-               {
+       public function checkPassword($uid, $password)
+       {
+            if(!$this->db_conn)
+            {
                 return false;
-               }
-           }
-           else
-           {
-            return false;
-           }
+            }
+            
 		    $query = "SELECT $this->sql_column_username, $this->sql_column_password FROM $this->sql_table WHERE $this->sql_column_username = '$uid';";
-		    $result = mysqli_query($db, $query);
-		    if(!$result)
+		    $result = $this->db->prepare($query);
+		    if(!$result->execute())
 		    {
 		        return false;
 		    }
-		    if(mysqli_num_rows($result) == 0)
+		    $row = $result->fetch();
+		    if(!$row)
 		    {
 		        return false;
 		    }
-		    $row = mysqli_fetch_row($result);
-		    if(crypt($password, $row[1]) == $row[1])
+		    if(crypt($password, $row[$this->sql_column_password]) == $row[$this->sql_column_password])
 		    {
 		        return $uid;
 		    }
 		    else
 		    {
 		        return false;
 		    }
        }
 
        /**
         * @brief Get a list of all users
         * @returns array with all uids
         *
         * Get a list of all users.
         */
 
        public function getUsers($search = '', $limit = null, $offset = null){
            $users = array();
-           $db = mysqli_connect ($this->sql_host, $this->sql_username, $this->sql_password);
-           if ($db) 
-           {
-               $success = mysqli_select_db ($db, $this->sql_database);
-               if(!$success)
-               {
-                return false;
-               }
-           }
-           else
+           if(!$this->db_conn)
            {
             return false;
            }
 		   $query = "SELECT $this->sql_column_username FROM $this->sql_table";
 		   if($search != '')
 		      $query .= " WHERE $this->sql_column_username LIKE '%$search%'";
 		   if($limit != null)
 		      $query .= " LIMIT $limit";
 		   if($offset != null)
 		      $query .= " OFFSET $offset";
-		   $result = mysqli_query($db, $query);
-		   if(!$result)
+		   $result = $this->db->prepare($query);
+		   if(!$result->execute())
 		   {
 		    return array();
 		   }
-		   if(mysqli_num_rows($result) == 0)
+		   while($row = $result->fetch())
 		   {
-		    return array();
-		   }
-		   while($row = mysqli_fetch_row($result))
-		   {
-		       $users[] = $row[0];
+		       $users[] = $row[$this->sql_column_username];
 		   }
            return $users;
        }
 
        /**
         * @brief check if a user exists
         * @param string $uid the username
         * @return boolean
         */
 
        public function userExists($uid)
        {
-           $db = mysqli_connect ($this->sql_host, $this->sql_username, $this->sql_password);
-           if ($db) 
-           {
-               $success = mysqli_select_db ($db, $this->sql_database);
-               if(!$success)
-               {
+            if(!$this->db_conn)
+            {
                 return false;
-               }
+            }
+            
 		    $query = "SELECT $this->sql_column_username FROM $this->sql_table WHERE $this->sql_column_username = '$uid';";
-		    $result = mysqli_query($db, $query);
-		    if(!$result)
+		    $result = $this->db->prepare($query);
+		    if(!$result->execute())
 		    {
 		        return false;
 		    }
-		    if(mysqli_num_rows($result) == 0)
-		    {
+            $row = $result->fetch();
+            if(!$row)
+            {
 		        return false;
-		    }
-		    return true;
-               
-               
-           }
-           else
-           {
-            return false;
-           }
+            }
+            else
+            {
+                return true;
+            }
 
        }
 
 }
 
 ?>