REVISION OF GRID/BROWSE

Creative ideas/suggestions for HMG

Moderator: Rathinagiri

User avatar
esgici
Posts: 4543
Joined: Wed Jul 30, 2008 9:17 pm
DBs Used: DBF
Location: iskenderun / Turkiye
Contact:

Re: REVISION OF GRID/BROWSE

Post by esgici »

Roberto Lopez wrote:...
The times are changing... and IMHO the xBase Browse way belongs to the past...
...
... too many thing altogether ...
thefutureaintwhatitusedtobe.jpg
thefutureaintwhatitusedtobe.jpg (36.82 KiB) Viewed 6451 times
:cry:
Viva INTERNATIONAL HMG :D
User avatar
Rathinagiri
Posts: 5471
Joined: Tue Jul 29, 2008 6:30 pm
DBs Used: MariaDB, SQLite, SQLCipher and MySQL
Location: Sivakasi, India
Contact:

Re: REVISION OF GRID/BROWSE

Post by Rathinagiri »

Roberto Lopez wrote:
mol wrote:I'm still using dbfs and browse control. I think it should always be updated.
I remember Roberto words, where he turned back from words this control is obsolete.
Great advantage of dbfs is this system is portable.
You can say that sqlite exists, but it hasn't still some types of fields.
As I've explained a couple of times already, the last years I'm mainly using NETIO with excellent results. I use remote procedures, so, all the data handling is done in the server.

Moreover, when I occasionally need to work with local data, I do not use Browse, nor DataGrid.

I use simple grids that are loaded with the required data from dbfs, using constructs like LOCATE FOR... DO WHILE FOUND()... CONTINUE... ENDDO. In some cases, the use of conditional, temporary indexes, is a good technique too.

The grid is automatically updated, after append, delete, and modify operations, or manually (by the user) via a simple [Refresh] button.

IMHO, this is the more efficient and simple way to work, and since the users are habituated to think in 'client/server' way, because the web, there is no problem on that side either.

If I were starting a new GUI library now, I'm pretty sure that I could not include data bound controls in it.

I guess that the only required thing, could be a method, to assign to the grid, a two dimensional array (the recordset) in an efficient, very fast way.

The times are changing... and IMHO the xBase Browse way belongs to the past...

I admit that my decision of tagging browse as obsolete was premature, but, IMHO, sooner or later, that will happen, simply because 'the world' is switching to client/server and because it is a better way to work.

An additional benefit of this approach is the separation between user interface (presentation) and data handling... another 'unavoidable' thing... I can assure you, that this will make your programmer life a lot easier :)
Rightly said Master.
East or West HMG is the Best.
South or North HMG is worth.
...the possibilities are endless.
User avatar
brain
Posts: 26
Joined: Tue Aug 02, 2011 5:01 pm

Re: REVISION OF GRID/BROWSE

Post by brain »

Pablo César wrote:What we have to understand is GRID and BROWSE are different controls.

When you said like dbEdit, must be cleared something: an control for exclusive use for DBFs, right ?

Because dbEdit only works with databases and also it's hard to work on to conciliate both: arrays and databases in GRIDs.

Otherwise Joselito (brain), why are you requesting this ?

BROWSE is deprecated (descontinued) in HMG and not implementations have been done over this control.

My suggestion is to work on the BROWSE or with other similar name for only and exclusive use for DBFs and working similar of TBrowseDB of old Clipper but in this time in GUI. I'm not sure if this is posible and also I do not know if it's worth it considering many users are migrating to SQL usage instead DBFs. :?
tnx for the advise mr pablo but when i am using BROWSE it is also similar with the GRID because the DBF records will be stored to the array then display, what if i have 1M of records to display? unlike the DBEDIT functions even how many records do u want to display it will not get slower just because if u want to display 20 records per page, data[20] arrays only you will use. everytime a loop does, the function itself substitute the remaining records to the 20 arrays. even in the SQL i think we can use my suggestion. tnx and more power!
User avatar
dragancesu
Posts: 920
Joined: Mon Jun 24, 2013 11:53 am
DBs Used: DBF, MySQL, Oracle
Location: Subotica, Serbia

Re: REVISION OF GRID/BROWSE

Post by dragancesu »

There are tables with lots of data, 1M may not be much, but I do not know the situation when all that needs to show, it usually takes show part of the data (a filter), and then it is usually up to 5 screens which is acceptable

maybe I do not know, tell me the situation should show 1M data?
User avatar
luisvasquezcl
Posts: 1258
Joined: Thu Jul 31, 2008 3:23 am
Location: Chile
Contact:

Re: REVISION OF GRID/BROWSE

Post by luisvasquezcl »

Estimados,
Vuelvo a activar este tema ya que aún sigue el problema con el grid.
Les comento que lo uso cargando los datos en array y no conectado a DBF.
Al ir recargando el grid con datos parcializados, que en algunos casos pueden ser 300 lineas, el aumento de memoria es muy grande y se nota ya que comienza a poner lenta la aplicación.
Espero se pueda solucionar este problema.
Saludos cordiales,
Luis Vásquez.

Dear,
I reactivate this issue and that is still the problem with the grid.
I commented that I use loading data array and not connected to DBF.
To go recharging the grid with biased data, which in some cases may be 300 lines, increased memory is very large and it shows as it begins to slowly put the application.
I hope this problem can be solved.
Best regards,
User avatar
luisvasquezcl
Posts: 1258
Joined: Thu Jul 31, 2008 3:23 am
Location: Chile
Contact:

Re: REVISION OF GRID/BROWSE

Post by luisvasquezcl »

Estimados,
estoy probando con grid virtual pero el problema es peor, ya que está aumentando constantemente.
saludos cordiales,

Dear,
I'm testing with virtual grid but the problem is worse because it is constantly increasing.
Best regards,
User avatar
mol
Posts: 3718
Joined: Thu Sep 11, 2008 5:31 am
Location: Myszków, Poland
Contact:

Re: REVISION OF GRID/BROWSE

Post by mol »

Hi guys!
I want to refresh this topic and present modified sample 38 of grid. My friend was testing this sample with few version of HMG and got a lot of strange behaviours.

The display content of the grid becomes blank when you divide by 0 (call upper menu -> Divide -> Divide 3/0).
The display also stay blank when you lock LOCK.DBF file eg. by dbu before running this sample.

I'm attaching sample with .dbf files.

Regards, Marek
Attachments
GRID_Problems.ZIP
(4.97 KiB) Downloaded 320 times
User avatar
serge_girard
Posts: 3161
Joined: Sun Nov 25, 2012 2:44 pm
DBs Used: 1 MySQL - MariaDB
2 DBF
Location: Belgium
Contact:

Re: REVISION OF GRID/BROWSE

Post by serge_girard »

Hi Marek,

I try later your demo.

IMHO it is always better to retrieve data (after or before) showing in a grid. In this way you NEVER lock the database.
This is how very large systems on mainframes works and if you work with much records, consider paging. (This is more complicated...)

I use arrays build-up just before DEFINE WINDOWS or after with ADD ITEM {aARRAY, ...} TO GRID... OF ...


Greetings, Serge
There's nothing you can do that can't be done...
User avatar
mol
Posts: 3718
Joined: Thu Sep 11, 2008 5:31 am
Location: Myszków, Poland
Contact:

Re: REVISION OF GRID/BROWSE

Post by mol »

This is only sample for testing...
Thanks for your interest, Serge!
User avatar
esgici
Posts: 4543
Joined: Wed Jul 30, 2008 9:17 pm
DBs Used: DBF
Location: iskenderun / Turkiye
Contact:

Re: REVISION OF GRID/BROWSE

Post by esgici »

mol wrote:Hi guys!
I want to refresh this topic and present modified sample 38 of grid. My friend was testing this sample with few version of HMG and got a lot of strange behaviours.

The display content of the grid becomes blank when you divide by 0 (call upper menu -> Divide -> Divide 3/0).
The display also stay blank when you lock LOCK.DBF file eg. by dbu before running this sample.

I'm attaching sample with .dbf files.

Regards, Marek
Hi Marek

IMHO you need your own error recovery system in order to distinguish error situations from GRID's one.

Please look at attached demo ( slightly modified version of your test demo.prg);

I hope it will give you an idea :idea:

Viva HMG :D
demoBE.zip
Adding a simple error recovery system to demo.
(1.47 KiB) Downloaded 369 times
Viva INTERNATIONAL HMG :D
Post Reply