Solved

A Dataset component that is NOT attached to a DB?

Posted on 2004-04-15
4
833 Views
Last Modified: 2010-04-04
I am trying to use a Rave report on a set of data that is passed in to my application from a server: there is no database resident in the client application. The Rave report needs to run off a dataset, but the object that gets passed in is actually an array of created objects having parameters .Name, .Suburb, .State etc. (all strings). I then pull that apart to load it into a stringgrid for display, but I also need to be able to print it in Rave, which requires a Dataset.

I've tried to use a SimpleDataSet component, with data fields added independently, and then I tried to add data by:

      tblPrint.Append;
      tblPrintID.AsString := sgCompany.Cells[0,i+1];
      tblPrintTradingName.AsString := sgCompany.Cells[1,i+1];
      tblPrintSuburb.AsString := sgCompany.Cells[2,i+1];
      tblPrintState.AsString := sgCompany.Cells[3,i+1];
      tblPrintPostCode.AsString := sgCompany.Cells[4,i+1];
      tblPrintContactNumber.AsString := sgCompany.Cells[5,i+1];
      tblPrint.Post;

... but tblPrint (the SimpleDataSet) still seems to require attachment to a database and a table of some sort. I also tried a TTable but that involves including the BDE, which is not an option.

I guess what I really want is a 'virtual' table: something I can stack with data by code as above but without having to attach it to a real table or database. But it must be enough of a Dataset to appear in the pulldown list in the TRvDataSetConnection's Dataset property.  

Any suggestions?

MartinC
0
Comment
Question by:MartinC
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 12

Accepted Solution

by:
Lee_Nover earned 90 total points
ID: 10839392
no, not SimpleDataSet .. only ClientDataSet
you simply create new fields and call CreateDataSet (in design or runtime)
for loading from a file .. well .. you call LoadFromFile :)
0
 

Author Comment

by:MartinC
ID: 10839579
Hmmm. thanks Lee, but I still don't understand how this solves the problem. I have tried a ClientDataSet and it doesn't work either: it says "Missing Data Provider or Data Packet". I want an object that doesn't HAVE a DataProvider: I am supplying all the data anyway; there are no fields to enter.

MartinC
0
 
LVL 12

Expert Comment

by:Lee_Nover
ID: 10839732
as I said .. call CreateDataSet
it works at designtime as well (right click on the clientdataset)

simple example:

put a ClientDataSet (later refered to as CDS) on a form or datamodule
doubleclick it to open the fields editor
add new fields (Name, Suburb, State,... )
rightclick the CDS and click CreateDataSet - it will create the dataset and open it
from then on it's fully usable as an in-memory dataset

I use it like that very often
0
 

Author Comment

by:MartinC
ID: 10839851
Success! We had a fiddle with it and for anyone else following this thread the trick is to use CreateDataSet INSTEAD of Open ... you just use the dataset without ever opening it.

Thanks Lee, points to you ... got it answered just in time so I can deliver my project Phase 2 on schedule ... then walk out the door of my last day of work here! Got a new job in the big city!    

Martin C
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …
Finding and deleting duplicate (picture) files can be a time consuming task. My wife and I, our three kids and their families all share one dilemma: Managing our pictures. Between desktops, laptops, phones, tablets, and cameras; over the last decade…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question