为什么我写这句代码的时候提示diaoduquery6 不在edit和insert的状态下

diaoduquery4.Close;
  diaoduquery4.DatabaseName:='dddb';
  diaoduquery4.SQL.Clear;
  diaoduquery4.SQL.Add('select * from '+jbzname+'对应表');
  diaoduquery4.Open;
  while diaoduquery4.Eof=false do
  begin
  if(diaoduquery4.FieldByName('材料名称').AsString=diaoduquery5.FieldByName(t).AsString) and (length(diaoduquery5.FieldByName(t).AsString)>0) then
  begin

  diaoduquery6.Close;
  diaoduquery6.DatabaseName:='jbzdb';
  diaoduquery6.SQL.Clear;
  diaoduquery6.SQL.Add('select * from 配比 where 任务编号='''+edit25.Text+'''');
  diaoduquery6.Open;
  diaoduquery6.FieldByName(diaoduquery4.fieldbyname('对应字段').AsString).AsString:= diaoduquery4.FieldByName('材料名称').AsString;

因为你写的是赋值语句,所以datase必须处于编辑或者插入状态,
diaoduquery6.edit

diaoduquery6.Open;
后面加
diaoduquery6.Edit;

diaoduquery6.Close;
  diaoduquery6.DatabaseName:='jbzdb';
  diaoduquery6.SQL.Clear;
  diaoduquery6.SQL.Add('select * from 配比 where 任务编号='''+edit25.Text+'''');
  diaoduquery6.Open;
  diaoduquery6.edit;
  diaoduquery6.FieldByName(diaoduquery4.fieldbyname('对应字段').AsString).AsString:= diaoduquery4.FieldByName('材料名称').AsString;
这样子可以么

diaoduquery6cann't modify a read-only dataset

'table is read-only'这个错误咋改啊

diaoduquery6设置只读属性了。

没那个属性啊 
我想用它更新数据库中的数据 看来不行 看来得用update了 啊