[yunqa.de] Re: DISQLite3_Drive_Catalog demo & DevExpress Quantum TreeList
- From: "email@xxxxxxxxxx" <email@xxxxxxxxxx>
- To: yunqa@xxxxxxxxxxxxx
- Date: Fri, 14 Dec 2012 16:25:12 +0100
Understood.
Hours later, I managed to convert it using more or less decent speed.
Virtual Tree is still faster, but the DX converted project isn't bad either.
One thing I noticed about this demo: if a file gets added to the
FFileCache ie.
//
------------------------------------------------------------------------------------------------
//
function TDriveCatalogDB.GetFileData(const TheID : Int64) : PFileData;
begin
Result := FFileCache.GetItem(TheID);
if Not Assigned(Result) then
begin
Result := FFileCache.AddItem(TheID);
// ...
//
------------------------------------------------------------------------------------------------
//
And the file info is changed in db, the FFileCache cache is never updated.
This literally negates any benefits of using the cache in the first
place. I mean what's the benefits of getting the file info from the db
fast if this info is actually obsolete?
Is there a way to fix this?
Thanks!
On 12/14/2012 10:48 AM, Delphi Inspiration wrote:
On 14.12.2012 02:35, email@xxxxxxxxxx wrote:
I've been studying the DISQLite3_Drive_Catalog demo. It's *really* fast
and I wonder if there something similar that works with DevExpress'
QuantumTreeList (ie. TcxVirtualTreeList)
I am not aware of another solution which would rival the speed of
DISQLite3_Drive_Catalog or DISQLite3_Buffered_Grid.
I've been trying to adapt this demo for TcxVirtualTreeList, but failed
so far.
If anyone (Ralf?) has done this before (adapt the demo to work with
TcxVirtualTreeList), I'd be _very grateful_ if you could share it
I have no experience with TcxVirtualTreeList as I do not have a license
for it.
Ralf
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