If you have an array of dictionaries, you can use -filteredArrayUsingPredicate, and pass in the NSPredicate with the format string of @"type = 'website'". You'll get back all the dictionaries where [[dictionary objectForKey:@"type"] isEqual:@"website"];
But if you're using these dictionaries for anything more than just transient referencing (ie, they're quickly create and destroyed), then I would probably recommend making a class to hold the relevant information instead of using a dictionary. Dave On Mar 7, 2011, at 12:26 PM, Martin Batholdy wrote: > Hi, > > thanks for the reply. > > Is it also possible to filter the entries of an NSDictionary like in SQL? > > for example I have a key "type" and different entries. > > Is it possible to get an Array of all elements where "type" is equal to > "website" (or something like that)? > > > > On 07.03.2011, at 21:05, Wim Lewis wrote: > >> Well, sqlite3 is available on the system (and is used by a lot of Apple >> code, so hopefully it won't be removed in the near future); you could simply >> use that, if that API is what you're most familiar with. >> >> However, unless you have a pretty large data set, sqlite is probably >> overkill and it'd be easier to use a plist. I would start with an NSArray of >> NSDictionaries, and then if it makes the code cleaner replace the >> NSDictionaries with custom objects containing the fields you're interested >> in and whatever other methods logically belong there. >> >> NSArrayController can do sorting and filtering of these objects for you for >> presentation in the table view; if NSArrayController doesn't do what you >> need then it's easy enough to sort and filter them yourself and then >> implement the NSTableView data source methods. Take a look at the >> NSArrayController and bindings API documentation--- if bindings do what you >> need, they're really quick and convenient. >> >> >> _______________________________________________ >> >> Cocoa-dev mailing list ([email protected]) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/cocoa-dev/batholdy%40googlemail.com >> >> This email sent to [email protected] > > _______________________________________________ > > Cocoa-dev mailing list ([email protected]) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/davedelong%40me.com > > This email sent to [email protected] _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
