delphi程序，InternalDataSet:Cursor not returned from Query.游标无法从数据集返回。
用 SimpleDataSet1.DataSet.CommandText:='insert into TMP Select * from JZK where BZ = ''T'' and OLDDATE between '''+ (DBDateTimeEditEh3.Text) + ''' and ''' +(DBDateTimeEditEh4.Text) + ''' ';时，提示 " InternalDataSet: Cursor not returned from Query. " 游标无法从数据集返回。 请问怎么解决？

[解决办法]
SimpleDataSet1.Close();
SimpleDataSet1.DataSet.CommandText:='delete from tmp';
SimpleDataSet1.Execute;
SimpleDataSet1.DataSet.CommandText:='INSERT into TMP Select * from JZK where BZ = ''T'' and OLDDATE between '''+ (DBDateTimeEditEh3.Text) + ''' and ''' +(DBDateTimeEditEh4.Text) + ''' ';
SimpleDataSet1.Execute;