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Caching of DB information in array's?

Posted on 1998-11-13
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Hi,

I'm writing this program which much give the user a sort of graphical representation of a database (in a treeview). When the user want additional information I don't want to connect to the database again and get the information. I want as much information as possible gathered at startup when I initialize the representation. What is the best way to do this? Loading the tables in array's of records? Or memorytables? I don't know in front how many records will be processed, so if I use Array's I have to define them big enough. Can memory-problems arise then?
Anyway I need some tips. Maybe you want some more information, just ask.

Regards, Lizzzy.
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Question by:lizzzard
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by:dwwang
ID: 1346734
If you do not have the tree view completed yet, you can find BDTreeView on the internet. For caching the data, you can use InMemoryTables. See DbiCreateInMemTable in BDE32.Hlp.
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Gerhard100198 earned 100 total points
ID: 1346735
Lizzzard,

As for the Array/Record idea, I use it often to store info. With Delphi 4's new dynamic arrays this is very easy and very powerful. In a 32 bit environment you shouldn't easily run into memory problems but as a programmer I personally always try and avoid having "too much" in memory at any time.

I suggest you make use of a TQuery.

When using a TQuery you get back a result set (you can view this as almost a cached version of you data). You can set up your query to include all the possible info that you need. The advantage that you then have is that this info is browsable with all DataAware controls and that you have access to all this info at any time.

If you need any additional info on this method let me know.

Gerhard
gerhardvr@email.com
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Author Comment

by:lizzzard
ID: 1346736
Gerhard,

Thank you for your suggestion, I didn't think of a solution based on a TQuery. I will certainly look into it wether it's suitable for my application. You'll hear from me as soon as possible,

Regards, Lizzzy
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