method update_display = fun iter ->
let query = self#get_data ~row:iter in
self#set ~row:iter ~column:c_name (query.SQL_db.qry_name);
self#set ~row:iter ~column:c_query (query.SQL_db.qry_query);
let state = SQL_db.query_state query in
self#set ~row:iter ~column:c_state (SQL_db.string_of_query_state state)