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Re: ANN: CDBStore, a lightweight persistent dictionary
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Re: ANN: CDBStore, a lightweight persistent dictionary


  • Subject: Re: ANN: CDBStore, a lightweight persistent dictionary
  • From: Jeff LaMarche <email@hidden>
  • Date: Fri, 02 May 2008 21:38:19 -0400


On May 2, 2008, at 9:07 PM, Jens Alfke wrote:
CDBStore is a kind of middle ground between simple property-lists or archived objects, and CoreData. There's a very large empty space there, and I kept getting annoyed by having to cobble together yet another bit of code to read and write a dictionary from a file. And I'm not the only one, as evidenced by this message:

This is very cool, Jens. I'm looking forward to trying this out.

I actually started working on a little different approach to that "middle ground" you talk about yesterday. What I've done, although it's not production ready yet, is to use some of Objective-C's runtime functions to create a class that if you subclass it, all the properties you declare are automatically saved to a SQLite database. It's implemented as just a single class and a single-method protocol that your application delegate needs to conform to (a method that opens and returns the database). It dynamically generates the SQL to create, delete, insert, and update the database based on the declared properties, so you don't have to write any code and don't have to create a mapping file, or do anything else. It even handles foreign key associations for instance variables that are also subclasses of this class, and uses cross reference tables to store arrays and dictionaries that contain objects that are subclasses.

It's similar to the Ruby ActiveRecord implementation, except for being object-driven rather than table driven. I think the concept has a lot of potential, but I've got quite a bit of work to do before I'm comfortable publishing it for others to see. Your solution might work for me, though, and save me some work. :)
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References: 
 >ANN: CDBStore, a lightweight persistent dictionary (From: Jens Alfke <email@hidden>)

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