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Re: Some remarks to pgadmin III

From: Andreas Pflug <pgadmin(at)pse-consulting(dot)de>
To: claus <ch(at)greenmail(dot)ch>
Cc: "Adam H(dot) Pendleton" <fmonkey(at)fmonkey(dot)net>,pgadmin-hackers(at)postgresql(dot)org
Subject: Re: Some remarks to pgadmin III
Date: 2003-08-15 15:56:30
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Lists: pgadmin-hackers
claus wrote:

>Is there still some hope :-))
>Adam H. Pendleton wrote:
>>I assume when you say that sorting the rows would require a re-query, 
>>you are referring to a new SQL statement with a "ORDER BY" clause.  I 
>>think what he's asking for is perfectly do-able without a new query.  
>>Since the rows are stored in a grid control of some sort, then you 
>>should be able to sort the rows using the function of that grid control 
>>itself.  This sort would have *no* impact on the actual data, where it 
>>is in the database, etc.  I would imagine that this sort of this would 
>>be possible only if the wxWindows control used to display the data 
>>supported it.  I will do some reasearch and see if it can be done.
>That is when I said that data is around in some form. 
>I just tested a table with 13000 entries ... 
>after "refreshing" it **realy** seems to me all data is  on my PC.
>When scrolling there is absolutely **no** freeze, flicker or
>other indication of data being fetched in a lazy way.
Thanks, I appreciate the compliments. It proves that I implemented it 
smoothly. You might notice a delay it when you're connected to the 
server over a slow line.

Look at the code if you don't believe that data is really loaded on 
demand. Every time a row is touched that's not in the cache 
(!line->cols), sqlTable::GetValue will consult the Dataset for the 
column values of that row.

>Also the sliders of the grid indicate perfectly where are in the
>data ... ok that might be done using a "total row count" value.
Fortunately libpq supplies this value. sliders that don't represent the 
position are a Mega-PITA, degrading the slider to a "next page" button. 
I'd never code stuff like that.

>For those who worked with tools doing on demand row fetch.
>(I think Delphi 3 Datamanger and Free Toad for Oracle)
>they know what I mean.
Poor software all over the world....


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