Facebook FQL multiquery in iOS SDK

问题:

I am looking for some documentation or sample code on how to send multiquery fql requests to Facebook via iOS SDK. I found some older samples but they doesnt work for me. I have populated an NSDictionary with the queries and I try to send the request via [[FBRequest requestWithDelegate:self] call:@"facebook.fql.multiquery" params:params];, as stated in the samples I have read, but I get an "unrecognized selector sent to class" error and I cant find the "requestWithDelegate" method in FBRequest.h either. Is it deprecated? Some help on this would be very appreciated!

回答1:

// Construct your FQL Query 
NSString* fql = [NSString stringWithFormat:@"SELECT uid, name, hometown_location from user where uid IN (SELECT uid2 FROM friend WHERE uid1=%lld) and hometown_location != '' ORDER BY rand() limit 4", facebookId];

// Create a params dictionary
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObject:fql forKey:@"query"];

// Make the request 
[facebook requestWithMethodName:@"fql.query" andParams:params andHttpMethod:@"GET" andDelegate:self];

The the delegate FBRequestDelegate will be call with the response. Depending on your needs, you'll do something like:

- (void)request:(FBRequest*)request didLoad:(id)result {
    NSLog(@"didLoad() received result: %@", result);
}

The facebook object is created like:

Facebook * facebook = [[Facebook alloc] initWithAppId:kAppID];

More info on how to set this up can be found here: https://developers.facebook.com/docs/guides/mobile/

And depending on your FQL query, you will need permissions from the user. See the list of permissions here: https://developers.facebook.com/docs/authentication/permissions/

There is also a test console for FQL queries here: https://developers.facebook.com/docs/reference/rest/fql.query/

And if you want to do an Multiquery instead of a single query, it would look like:

NSString* fql1 = [NSString stringWithFormat:
    @"select uid2 from friend where uid1 == %lld order by rand() limit 10", facebookId];
NSString* fql2 = [NSString stringWithFormat:
    @"select uid, name from user where uid in (select uid2 from #queryID)"];
NSString* fql3 = [NSString stringWithFormat:
    @"select uid, status_id, message from status where uid in (select uid from #queryName) limit 1"];
NSString* fql = [NSString stringWithFormat:
    @"{\"queryID\":\"%@\",\"queryName\":\"%@\",\"queryStatus\":\"%@\"}",fql1,fql2,fql3];

NSDictionary* params = [NSDictionary dictionaryWithObject:fql forKey:@"queries"];   

[facebook call:@"fql.multiquery" params:params];