Re: Saving a NSMutableArray
Re: Saving a NSMutableArray
- Subject: Re: Saving a NSMutableArray
- From: "Florian G\. Pflug" <email@hidden>
- Date: Sat, 17 May 2003 02:43:52 +0200
On Fri, May 16, 2003 at 08:09:21PM +0200, Lorenzo wrote:
>
let's suppose I have a very large database in an NSMutableArray I did read
>
early from the disk.
>
Each record is a NSMutableDictionary with 2 keys, Name and Surname.
>
If I change one only key, e.g. the Name, of one only record,
>
should then I save the whole NSMutableArray with
>
>
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)flag ?
>
>
or can I save only the small changement to the existing file?
>
If yes, haw can I do?
I think, if the database in your NSMutableDictionary is big enough to make
always saving the whole dictionary to disk a problem, than you should
consider using some sort of database for the whole thing.
I don't mean a full-fleged sql-database, but something like berkely db.
Berkley DB (or one of it's clones) is nearly standard to have an on an unix
system, so I guess OSX includes a version. Look for a library or framework
(or headerfile) call db2 or db3.
A Berkley DB is essentially an on-disk hash, storing arbitrary values to a
key, As far as I remeber, the key has to be a string, though.
Writing a wrapper to make a berkley-db look like a MutableDictionary should
be fairly trivial.
greetings, Florian Pflug
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