anchor.diff:                  parameters = [],
                   types = [],
                   stmt_type,
  -                columns = [],
  +                xsqlvars = [],
                   rows = [],
                   results = []}).
   
  
positive.code: handle_call(description, _From, State) ->
      case State#state.stmt_type of
          isc_info_sql_stmt_select
              -> {reply, description(State#state.columns, []), State};
          _
              -> {reply, no_result, State}
      end;
  
negative.code: handle_call({prepare, Sql}, _From, State) ->
      case R = prepare_statement(State#state.mod, State#state.sock,
                  State#state.trans_handle, State#state.stmt_handle, Sql) of
          {StmtType, XSqlVars} ->
              {reply, ok, State#state{stmt_type=StmtType, xsqlvars=XSqlVars}};
          _ ->
              {reply, ok, State#state{stmt_type=R}}
      end;
  