FriendsFriends

public function insert( array  $data )

public function update( array  $data,   $where )

public function delete( $where )

public function getRequestsByUsername( $username )

public function getPendingByUsername( $username )

public function getTotalByUsername( $username )

public function isRequestPending( $username, $friend_username )

public function isFriend( $username, $friend_username )