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  • Scalable Database Tagging Schema

    - by Longpoke
    EDIT: To people building tagging systems. Don't read this. It is not what you are looking for. I asked this when I wasn't aware that RDBMS all have their own optimization methods, just use a simple many to many scheme. I have a posting system that has millions of posts. Each post can have an infinite number of tags associated with it. Users can create tags which have notes, date created, owner, etc. A tag is almost like a post itself, because people can post notes about the tag. Each tag association has an owner and date, so we can see who added the tag and when. My question is how can I implement this? It has to be fast searching posts by tag, or tags by post. Also, users can add tags to posts by typing the name into a field, kind of like the google search bar, it has to fill in the rest of the tag name for you. I have 3 solutions at the moment, but not sure which is the best, or if there is a better way. Note that I'm not showing the layout of notes since it will be trivial once I get a proper solution for tags. Method 1. Linked list tagId in post points to a linked list in tag_assoc, the application must traverse the list until flink=0 post: id, content, ownerId, date, tagId, notesId tag_assoc: id, tagId, ownerId, flink tag: id, name, notesId Method 2. Denormalization tags is simply a VARCHAR or TEXT field containing a tab delimited array of tagId:ownerId. It cannot be a fixed size. post: id, content, ownerId, date, tags, notesId tag: id, name, notesId Method 3. Toxi (from: http://www.pui.ch/phred/archives/2005/04/tags-database-schemas.html, also same thing here: http://stackoverflow.com/questions/20856/how-do-you-recommend-implementing-tags-or-tagging) post: id, content, ownerId, date, notesId tag_assoc: ownerId, tagId, postId tag: id, name, notesId Method 3 raises the question, how fast will it be to iterate through every single row in tag_assoc? Methods 1 and 2 should be fast for returning tags by post, but for posts by tag, another lookup table must be made. The last thing I have to worry about is optimizing searching tags by name, I have not worked that out yet. I made an ASCII diagram here: http://pastebin.com/f1c4e0e53

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  • Using Kal calendar without doing the initialization (and so on) in the AppDelegate

    - by testing
    I'm using the Kal calendar. For the code shown below I'm referring to the Holiday example. In this example the allocation and initialization of Kal is done in the applicationDidFinishLaunching in the AppDelegate. The UITableViewDelegate protocol (e.g. didSelectRowAtIndexPath) is also positioned in the AppDelegate class. The AppDelegate: #import "HolidayAppDelegate.h" #import "HolidaySqliteDataSource.h" #import "HolidaysDetailViewController.h" ## Heading ###import "Kal.h" @implementation HolidayAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(UIApplication *)application { kal = [[KalViewController alloc] init]; kal.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Today" style:UIBarButtonItemStyleBordered target:self action:@selector(showAndSelectToday)] autorelease]; kal.delegate = self; dataSource = [[HolidaySqliteDataSource alloc] init]; kal.dataSource = dataSource; // Setup the navigation stack and display it. navController = [[UINavigationController alloc] initWithRootViewController:kal]; [window addSubview:navController.view]; [window makeKeyAndVisible]; } // Action handler for the navigation bar's right bar button item. - (void)showAndSelectToday { [kal showAndSelectDate:[NSDate date]]; } #pragma mark UITableViewDelegate protocol conformance // Display a details screen for the selected holiday/row. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { Holiday *holiday = [dataSource holidayAtIndexPath:indexPath]; HolidaysDetailViewController *vc = [[[HolidaysDetailViewController alloc] initWithHoliday:holiday] autorelease]; [navController pushViewController:vc animated:YES]; } #pragma mark - - (void)dealloc { [kal release]; [dataSource release]; [window release]; [navController release]; [super dealloc]; } @end I don't want to put this into the AppDelegate, because there could be some overlapping code with other views. It should be a separate "component" which I can call and put on the stack. In my navigation based project I have a main view, the RootViewController. From there I want to push the Kal view on the stack. Currently I'm pushing an additional ViewController on the stack. In the viewWillAppear method from this ViewController I do the things shown in the code above. The following problems appear: Navigation back has to be done two times (one for the Kal calendar, one for my created view) Navigation to my main view is not possible anymore In the moment I don't know where to put this code. So the question is where to put the methods for allocation/initialization as well as the methods for the UITableViewDelegate protocol.

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  • Android: View.getTag/setTag and IllegalArgumentException

    - by Sparafusile
    Yes, I know you need a unique resource id when calling the version of these functions that requires a key, but I cannot for the life of me figure out how to create a resource id that can be used in this way. A final variable in my class wont work and neither will a hard coded value. Both threw an IllegalArgumentException. So what gives, how do you use these methods? Spara

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  • IronPython overriding __setattr__ and __getattr__

    - by yodaj007
    I'm trying to implement a class in C# with a method that intercepts the Python __setattr__ and __getattr__ magic methods. I found this bug report: http://ironpython.codeplex.com/WorkItem/View.aspx?WorkItemId=8143 But that is from 2008, and nowhere can I find ICustomAttributes or PythonNameAttribute. I don't see anything useful in Interfaces.cs either. Can someone point me in the right direction?

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  • List of objects plus a tag

    - by MC
    I want to store a list of objects, lets say of type Car, but with an additional 'tag' property eg a boolean True/False which does not belong on the Car class. What is the best way to accomplish this? I need to pass the result between methods.

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  • Android Twitter Application Development and Usage of TextView and Linkify

    - by y ramesh rao
    I'm on developing a twitter kind of Application where in I want that the user would be displayed the timelines and the Textview in the Lists require to perform clicks on (http://)URLs, (@)usernames, and (#)hasTags and I want to invoke custom methods over these actions, I have used the Linkify class and the actions but where of no use because the customization that i require cannot be incorporated.

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  • CLLOcationManager will work correctly in iphone sdk?

    - by Mikhail Naimy
    hi, I am using the code which is in the URL stackoverflow.but I have done database operation in that method(didEnterRegionCLRegion ).Will it work correctly without opening the application (in background).I have given alert also.but it is not called.anyone who is experienced , help me in this matter?I am in India..will it give only correct GEO information only for AT&T service provider?Apple did not give any sample code for it?I have registered location in viewcontroller, i have to do the same in any Delegate methods?

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  • Load a list of localized strings at once in IOS

    - by Victor Ronin
    I want to show a table with the list of strings which are localized. The straightforward method would be: a) Point data source to my ViewController b) Define an array c) Allocate the array in my ViewController and init (arrayWithObjects) it with the strings from localized resources (NSLocalizedString) d) Use this array in UITableViewDataSource delegated methods Mainly my concern is item b). The construction looks quite heavy and I wonder whether I can somehow specify and load whole list of localized string at once.

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  • Base32 Decoding

    - by trampster
    I have a base32 string which I need to convert to a byte array. And I'm having trouble finding a conversion method in the .net framework. I can find methods for base64 but not for base32. Convert.FromBase64String – something like this for base32 would be perfect. Is there such a method in the framework or do I have to roll my own?

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  • Auto generation of Web Service sample, help and documentation

    - by orjan
    We're using javax.jws.WebServices deployed in a Glassfish server, is there a way to auto generate documentation like the one ASMX services generates? ASMX services display methods in service ASMX services when running locally could be easily tested with a prebuilt form ASMX services provided a sample request and response XML message http://keithelder.net/blog/archive/2008/01/15/How-to-Get-Around-WCFs-Lack-of-a-Preview-Web.aspx In Glasshfish together with /test/TestApi?wsdl there's /test/TestApi?Tester but it doesn't work, I don't know if it can be used to provide similar features as above?

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  • Multiple Keybinding to a single command

    - by Veer
    My window has just a listview. This facilitates the users to incremental search the db. Since the design does not have a textbox, i've to globally handle the keys. I think it could be achieved by keybinding. But how can i handle all the keys and associate it to a single command. Also suggest me other methods if any.

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  • some problems with jquery

    - by CoffeeCode
    I'm using AJAX_POSTUP. When i make a request it sends a file to a bowser [offers to download] (the files content are params of the action methods). Does anyone know whats going on and how i can avoid this problem??? i'm not aware of other plugins such as AJAX_POSTUP

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  • Why are static classes considered “classes” and “reference types”?

    - by Timwi
    I’ve been pondering about the C# and CIL type system today and I’ve started to wonder why static classes are considered classes. There are many ways in which they are not really classes: A “normal” class can contain non-static members, a static class can’t. In this respect, a class is more similar to a struct than it is to a static class, and yet structs have a separate name. You can have a reference to an instance of a “normal” class, but not a static class (despite it being considered a “reference type”). In this respect, a class is more similar to an interface than it is to a static class, and yet interfaces have a separate name. The name of a static class can never be used in any place where a type name would normally fit: you can’t declare a variable of this type, you can’t use it as a base type, and you can’t use it as a generic type parameter. In this respect, static classes are somewhat more like namespaces. A “normal” class can implement interfaces. Once again, that makes classes more similar to structs than to static classes. A “normal” class can inherit from another class. It is also bizarre that static classes are considered to derive from System.Object. Although this allows them to “inherit” the static methods Equals and ReferenceEquals, the purpose of that inheritance is questionable as you would call those methods on object anyway. C# even allows you to specify that useless inheritance explicitly on static classes, but not on interfaces or structs, where the implicit derivation from object and System.ValueType, respectively, actually has a purpose. Regarding the subset-of-features argument: Static classes have a subset of the features of classes, but they also have a subset of the features of structs. All of the things that make a class distinct from the other kinds of type, do not seem to apply to static classes. Regarding the typeof argument: Making a static class into a new and different kind of type does not preclude it from being used in typeof. Given the sheer oddity of static classes, and the scarcity of similarities between them and “normal” classes, shouldn’t they have been made into a separate kind of type instead of a special kind of class?

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  • In Ruby on Rails, routes.rb, if map.something will create something_path and something_url, does map

    - by Jian Lin
    In Ruby on Rails, routes.rb, if we create a "named route" map.something ":a/:b", :controller => 'foobar' it will also create something_path and something_url which are two methods usable in the controller and in the view. Does map.connect create something like that too? Otherwise, isn't map.connect somewhat disadvantaged in this way? I checked that connect_path and connect_url both aren't created automatically.

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  • Ruby BigDecimal sanity check (floating point newb)

    - by Andy
    Hello, Hoping to get some feedback from someone more experienced here. I haven't dealt with the dreaded floating-point calculation before... Is my understanding correct that with Ruby BigDecimal types (even with varying precision and scale lengths) should calculate accurately or should I anticipate floating point shenanigans? All my values within a Rails application are BigDecimal type and I'm seeing some errors (they do have different decimal lengths), hoping it's just my methods and not my object types... Thanks!

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  • Storing GenericForeignKey content_type in another model?

    - by slypete
    I have a typical definition/instance situation in my data modeling. I'm trying to store the content_type of a GenericForeignKey in another model (the definition model) like so: class IndicatorFieldInstance(models.Model): definition = models.ForeignKey(IndicatorField) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey(definition.content_type, 'object_id') indicator_instance = models.ForeignKey(IndicatorInstance) I've also tried it like this: content_object = generic.GenericForeignKey('definition__content_type', 'object_id') Neither of these methods seem to work. Is it possible to achieve this? For reference, here's the definition model: class IndicatorField(models.Model): name = models.CharField(max_length='255') content_type = models.ForeignKey(ContentType) indicator = models.ForeignKey(Indicator) Thanks, Pete

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  • Class accessing inner class privates?

    - by aloh
    Class Outer { ... private class Node { private T data; ... private T getData() { return data; } } } What's the purpose of using set and get methods if the outer class can access inner class private members? What's the purpose of making inner classes private? Package access?

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  • GWT: stange import collision error in visualisation api

    - by parag_
    hi, I'm attempting to add two charts to a gwt page using the visualization api, but for some strange and inexplicable reason, eclipse claims that the following two imports are colliding - which makes no sense to me. In the methods where i am calling them, I have even tried using the fully qualified names, but that doesnt seem to help either. Any idea what may be going on ? import com.google.gwt.visualization.client.visualizations.Table.Options; import com.google.gwt.visualization.client.visualizations.LineChart.Options;

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  • PHPMailer - what sending method is most appropriate?

    - by Stomped
    Hello. I need to use PHPMailer to send emails out for the following reasons: small lists (less then 500) password resets general notifications, 100ish emails at a time And PHPMailer gives me the option to send via mail(), sendmail, or SMTP. Is there any reason to prefer one of these methods over the other? I don't know enough about email services in general to make an informed decision.

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