NULevelDB Search

NULevelDB_search.mm

const NSUInteger MAX = 10000;
NSString *first = @"MY_KEY";
NSString *last = [NSString stringWithFormat:@"MY_KEY%c", 127]; // key beyond the last printable character '~'
__block NSUInteger biggest = 0;
__block NSString *biggestKey = nil;

[db enumerateFromKey:first toKey:last block:^(NSString *key, NSData *value) {

	NSUInteger length = [value length];

	if(length > biggest) {
		if(length > MAX)
			return NO;
		biggest = length;
		[biggestKey release];
		biggestKey = [key retain];
	}

	return YES;
}];