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A Dataset component that is NOT attached to a DB?

Posted on 2004-04-15
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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
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Question by:MartinC
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Accepted Solution

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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 :)
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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
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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
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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
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