diff --git a/group_sql.php b/group_sql.php
new file mode 100644
index 0000000..641beff
--- /dev/null
+++ b/group_sql.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace OCA\user_sql;
+
+use \OCA\user_sql\lib\Helper;
+
+class OC_GROUP_SQL extends \OC_Group_Backend implements \OCP\GroupInterface
+{
+    protected $settings;
+    protected $helper;
+
+    public function __construct()
+    {
+        $this -> helper = new \OCA\user_sql\lib\Helper();
+        $domain = \OC::$server->getRequest()->getServerHost();
+        $this -> settings = $this -> helper -> loadSettingsForDomain($domain);
+        $this -> helper -> connectToDb($this -> settings);        
+        return false;
+    }
+
+    public function getUserGroups($uid) {
+        if(empty($this -> settings['sql_group_table']))
+        {
+            \OCP\Util::writeLog('OC_USER_SQL', "Group table not configured", \OCP\Util::DEBUG);
+            return [];
+        }
+        $rows = $this -> helper -> runQuery('getUserGroups', array('uid' => $uid), false, true);
+        if($rows === false)
+        {
+            \OCP\Util::writeLog('OC_USER_SQL', "Found no group", \OCP\Util::DEBUG);
+            return [];
+        }
+        $groups = array();
+        foreach($rows as $row)
+        {
+            $groups[] = $row[$this -> settings['col_group_name']];
+        } 
+        return $groups;
+    }
+
+    public function getGroups($search = '', $limit = null, $offset = null) {
+        if(empty($this -> settings['sql_group_table']))
+        {
+            return [];
+        }   
+        $rows = $this -> helper -> runQuery('getGroups', array(), false, true);
+        if($rows === false)
+        {
+            return [];
+        }   
+        $groups = array();
+        foreach($rows as $row)
+        {
+            $groups[] = $row[$this -> settings['col_group_name']];
+        }   
+        return $groups;
+    }
+
+    public function usersInGroup($gid, $search = '', $limit = null, $offset = null) {
+        if(empty($this -> settings['sql_group_table']))
+        {
+            \OCP\Util::writeLog('OC_USER_SQL', "Group table not configured", \OCP\Util::DEBUG);
+            return [];
+        }
+        $rows = $this -> helper -> runQuery('getGroupUsers', array('gid' => $gid), false, true);
+        if($rows === false)
+        {
+            \OCP\Util::writeLog('OC_USER_SQL', "Found no users for group", \OCP\Util::DEBUG);
+            return [];
+        }
+        $users = array();
+        foreach($rows as $row)
+        {
+            $users[] = $row[$this -> settings['col_group_username']];
+        } 
+        return $users;
+    }
+}
+?>
diff --git a/user_sql.php b/user_sql.php
index 9283c66..f824a8d 100644
--- a/user_sql.php
+++ b/user_sql.php
@@ -31,7 +31,13 @@ namespace OCA\user_sql;
 
 use \OCA\user_sql\lib\Helper;
  
-class OC_USER_SQL extends \OC_User_Backend implements \OCP\IUserBackend, \OCP\UserInterface
+if(!interface_exists('OCP\\User\\IProvidesEMailBackend'))
+{
+   // hack for nextcloud
+   eval("namespace OCP\User; interface IProvidesEMailBackend {}");
+}
+
+class OC_USER_SQL extends \OC_User_Backend implements \OCP\IUserBackend, \OCP\UserInterface, \OCP\User\IProvidesEMailBackend
 {
     protected $cache;
     protected $settings;
@@ -116,6 +122,15 @@ class OC_USER_SQL extends \OC_User_Backend implements \OCP\IUserBackend, \OCP\Us
         return true;
     }
 
+    /**
+     * Only used by OwnCloud to get the email address
+     */
+    public function getEMailAddress($uid) {
+        $this->doEmailSync($uid);
+        $email = $this->ocConfig->getUserValue($uid, 'settings', 'email', '');
+        return $email;
+    }
+
     /**
      * This maps the username to the specified domain name.
      * It can only append a default domain name.