LocalStorage/WebSQL migration from iOS 5.0 (or before) to iOS 5.1

migration_localstorage.m

 //Valid Storage path :
    NSString* library = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)objectAtIndex:0];
    NSString *WebSQLSubdir = (IsAtLeastiOSVersion(@"5.1")) ? @"Caches" : @"WebKit/Databases";
    NSString *WebSQLPath = [library stringByAppendingPathComponent:WebSQLSubdir];
    NSString *WebSQLDb = [WebSQLPath stringByAppendingPathComponent:@"file__0"];
    NSString *WebSQLDbFile = [WebSQLDb stringByAppendingPathComponent:@"0000000000000001.db"];
    
    NSError *attributesError = nil;
    NSFileManager* fileManager = [NSFileManager defaultManager];
    NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:WebSQLDbFile error:&attributesError];
    long long validWebSQLDbFileSize = [[fileAttributes objectForKey:NSFileSize] longLongValue];
    
    
    NSString* documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];




//Migration from Webkit->Caches after update to iOS 5.1
    err = nil;
    NSString *oldWebKitSQLPath = [library stringByAppendingPathComponent:@"WebKit/Databases/file__0/0000000000000001.db"];
    if (IsAtLeastiOSVersion(@"5.1") && [fileManager fileExistsAtPath:oldWebKitSQLPath]) {
        
        NSError *attributesError = nil;
        NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:oldWebKitSQLPath error:&attributesError];
        long long previousfileSize = [[fileAttributes objectForKey:NSFileSize] longLongValue];
        
        if(previousfileSize > validWebSQLDbFileSize) 
        {
            if (previousfileSize>0) {
                //keep the smaller db file and rename it (just in case...)
                NSString *newPath = [WebSQLDbFile stringByAppendingString:@"old.db"];
                [fileManager moveItemAtPath:WebSQLDbFile toPath:newPath error:&err];
            }
            [fileManager createDirectoryAtPath:WebSQLDb withIntermediateDirectories:YES attributes:nil error:&err];
            err = nil;
            
            [fileManager copyItemAtPath:oldWebKitSQLPath toPath:WebSQLDbFile error:&err];
            if (err == nil)
                [fileManager removeItemAtPath:oldWebKitSQLPath error:&err];
            
            //Set date modified to now (to avoid the phonegap backup fix to replace this file)
            NSDate *now = [NSDate date];
            NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys:now  ,NSFileModificationDate, nil];
            [ [NSFileManager defaultManager] setAttributes:attrs ofItemAtPath:WebSQLDbFile error: &err];
            
            needToUpdateDb = true;
        }
    }

Does this work on PhoneGap 3?