Solved

Highlighted DBGrid entries, getting first & last...

Posted on 1997-11-05
2
166 Views
Last Modified: 2010-04-04
Hi!

I have a DBGrid attached to a table with about 630,000 entries in the table. The DBGrid is set to multiselect so the user can highlight (tag) any number of entries that interest them.

I can use a loop, starting from the first record and scanning all the entries until I come upon a DBGrid.SelectedRows.CurrentRowSelected to determine if a row is selected or not, but certainly there must be a better way to determine the first and last entries the user selected and just scan the records in between to find out which ones are selected as opposed to scanning the entire table!

The DBGrid component uses TBookmarks to keep track of the records the user selected but the documentation is horrible about TBookmarks. Is there a BookmarkFirst or BookmarkLast something or another to remedy this situation.

I'd appreciate hearing some creative solutions to this seemingly simple problem : )

Pegasus
My question is this.

0
Comment
Question by:Pegasus100397
2 Comments
 
LVL 5

Accepted Solution

by:
ronit051397 earned 160 total points
ID: 1349565
1. See explanation in the file manuals.txt.
2. example:

var I, J: Integer;

with DBGrid.SelectedRows, Table1 do //the records from the grid
                                      belong to Table1
for I:=0 to Count-1 do //do some actions only on the selected                          records
begin
  Find(Items[I],J);
  Bookmark:=items[I];
  Edit;
  //do something with the current selected record
  Post;
end;

//to find the last selected record do the following:
with DBGrid.SelectedRows, Table1 do
begin
  Find(Items[Count-1],J);
  Bookmark:=items[Count-1];
  Edit;
  //do something with the last selected record
  Post;
end;
0
 
LVL 3

Author Comment

by:Pegasus100397
ID: 1349566
Ronit,

Thanks for the answer! Solved my problem in 3 lines of code!

Talk about obscure documentation! I've never looked (or known  of Manuals.TXT) but found gobs of stuff in there pertaining to questions I've had. Thanks for turning me on to it. (I'll never say that REAL programmers never read the documentation again!).

Again, thanks for the answer!
Pegasus
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

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

Suggested Solutions

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
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…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

785 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