void function ( ) { database = dbHelper . getWritableDatabase ( ) ; }
open database connexion . concode_field_sep SQLiteDatabase database concode_elem_sep String[] allcolumns concode_elem_sep UserHelper dbHelper concode_field_sep User insertGetUser concode_elem_sep List<User> getAllUsers concode_elem_sep boolean insertUser concode_elem_sep User cursoToUser concode_elem_sep User getUser concode_elem_sep ContentValues values concode_elem_sep boolean deleteUser concode_elem_sep boolean updateUser concode_elem_sep void close