data modeling - Page 70

Tree data structure in iphone with coredata

- by ebabchick

Hi, I am looking to store a tree structure in CoreData for iphone. Can someone give me some tips on the best way to go about this? Basically I want to have a bunch of folders that people can dive into in a table view, and I want to have leaves of the tree be photos. The thing is, I want to be able to let the user edit these folders on-the-fly and add folders and content (photos) at their discretion. I'm relatively new to CoreData. Any help would be appreciated. Thanks.

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Core Data error when assigning variable with one-to-one relationship

- by Hoang Pham

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Problems sending and receiving data between php and perl?

- by Chip Gà Con

I have a problem in sending and receiving data between php and perl socket: -Problem: +php can not send all byte data to perl socket +Perl socket can not receiving all data from php . Here code php: function save(){ unset($_SESSION['info']); unset($_SESSION['data']); global $config,$ip; $start=$_POST['config']; $fp = fsockopen($_SESSION['ip'], $config['port'], $errno, $errstr, 30); if(!$fp) { $_SESSION['info']="Not connect "; transfer("Not connect".$ip, "index.php?com=server&act=info"); } else { $_SESSION['info']="Save config - ".$ip; fwrite($fp,$start); transfer("Sending data to ".$ip, "index.php?com=server&act=info"); } } Here code perl socket: #!/usr/bin/perl use strict; use warnings; use Carp; use POSIX qw( setsid ); use IO::Socket; $| = 1; my $socket = new IO::Socket::INET ( LocalHost => '192.168.150.3', LocalPort => '5000', Proto => 'tcp', Listen => 5, Reuse => 1 ); die "Coudn't open socket" unless $socket; print "\nTCPServer Waiting for client on port 5000"; my $client_socket = ""; while ($client_socket = $socket->accept()) { my $recieved_data =" "; my $send_data=" "; my $peer_address = $client_socket->peerhost(); my $peer_port = $client_socket->peerport(); print "\n I got a connection from ( $peer_address , $peer_port ) "; print "\n SEND( TYPE q or Q to Quit):"; $client_socket->recv($recieved_data,20000); #while (defined($recieved_data = <$client_socket>)) { if ( $recieved_data eq 'q' or $recieved_data eq 'Q' ) { close $client_socket; last; } elsif ($recieved_data eq 'start' or $recieved_data eq 'START' ) { $send_data = `/etc/init.d/squid start`; } elsif ($recieved_data eq 'restart' or $recieved_data eq 'RESTART' ) { $send_data = `/etc/init.d/squid restart`; } elsif ($recieved_data eq 'stop' or $recieved_data eq 'STOP' ) { $send_data = `/etc/init.d/squid stop`; } elsif ($recieved_data eq 'hostname' or $recieved_data eq 'HOSTNAME' ) { $send_data= `hostname`; } elsif ($recieved_data eq 'view-config' or $recieved_data eq 'VIEW-CONFIG' ) { $send_data = `cat /etc/squid/squid.conf` ; } else { # print $recieved_data; open OUTPUT_FILE, '> /root/data' or die("can not open file"); print OUTPUT_FILE $recieved_data; close OUTPUT_FILE } #} if ($send_data eq 'q' or $send_data eq 'Q') { $client_socket->send ($send_data); close $client_socket; last; } else { $client_socket->send($send_data); } }

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What is the structure of a (Data Access) Service Class

- by jiewmeng

I learnt that I should be using service classes to persist entities into the database instead of putting such logic in models/controllers. I currently made my service class something like class Application_DAO_User { protected $user; public function __construct(User $user) { $this->user = $user } public function edit($name, ...) { $this->user->name = $name; ... $this->em->flush(); } } I wonder if this should be the structure of a service class? where a service object represents a entity/model? Or maybe I should pass a User object everytime I want to do a edit like public static function edit($user, $name) { $user->name = $name; $this->em->flush(); } I am using Doctrine 2 & Zend Framework, but it shouldn't matter

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iPhone NSXMLParser parsing string and storing in a NSNumber variable and different data types

- by anubhav

Hi, I am trying to parse a XML File using NSXMLParser, I also have a Container class, in which I have a few instance variables. One of the elements that I am trying to parse in the XML is: <book sn="32.859669048339128" pn="-116.917800670489670"> I am trying to save the value of sn and pn in an instance variable of object Container: NSNumber *sn, NSNumber *pn. I want it so that when my parser get the attributeValues it can save it as a Double (or float) in those NSNumber pointers. Right now, all it does it just saves a string to the NSNumber. The Parser Code looks like this: if([elementName isEqualToString:@"book"]){ container = [[Container alloc] init]; container.sn=[attributeDict objectForKey:@"sn"]; container.pn=[attributeDict objectForKey:@"pn"]; } I want it so that the type of container.sn is initialized to a float or double. Any ideas how to do this? Thanks in advance!

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Iomega Home Media Network Hard Drive: Accesing the data in the disk?

- by JJarava

Hi all! I have an Iomega Home Media Network Hard Drive, 1TB, and lately I can't access the data on the drive. The shares (both built-in and created by me) are there, the security works, but when trying to access the data I get a "The network path was not found" message which is worrying, to say the least. I'd like to know if there is a way to get the data off the disks somehow, as some of the data in the drive (ie, pictures and videos of my 1.5 yrs old son) is hard if not impossible to find otherwise. Thanks a lot Javier

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iPhone Core Data: request for member 'tableView' in something not a structure or union

- by Nic Hubbard

I am trying to use CoreData to populate a UITableView. I have been using the developer "Locations" project, and I think I have everything correct. But, now I am getting the following error when I build: request for member 'tableView' in something not a structure or union Why would it be confused about tableView? I am using it many times in the methods. The errors seem to be coming from: [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES]; Ideas?

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Any 'pretty' data visualization libraries for Python?

- by int3

There are plenty of 'pretty-printing' visualization libraries for Javascript. E.g. those listed here. Googling for 'python visualization libraries' only turns up stuff like VTK and mayavi, which are primarily more for no-nonsense scientific use. So, do you know of any Python libraries similar to those Javascript ones in the above link? I particularly like the Javascript Infovis Toolkit.

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Data validation in excel cell using SpreadSheetGear.

- by Avinash

Hey How to validate integer and float in excel using spreadsheet gear. Thanks in Advance Avinash

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Saving UIImagePickerController images to Core Data without crashing

- by Gordon Fontenot

I have been trying to minimize my memory footprint with UIImagePickerController, but I'm starting to think that the memory problems I am having are resulting from poor memory management, instead of a particular way to handle the UIImagePickerController object. My workflow is this: The "Edit Image" button is clicked, which presents a UIActionSheet. This action sheet allows you to delete, take a picture, choose from the library, or cancel. If you select Choose from the library or Take Picture, I alloc an instance of UIImagePickerController and present it, followed by a release of UIImagePickerController: -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { if (actionSheet.tag != 999) { UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; imagePicker.delegate = self; BOOL pickImage = nil; if (actionSheet.tag == iPhoneWithDelete) { switch (buttonIndex) { case 0: object.objectImage = nil; pickImage = NO; break; case 1: imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; pickImage = YES; break; case 2: imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; pickImage = YES; break; default: pickImage = NO; break; } } else if (actionSheet.tag == iPhoneNoDelete) { switch (buttonIndex) { case 0: imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; pickImage = YES; break; case 1: imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; pickImage = YES; break; default: pickImage = NO; break; } } else if (actionSheet.tag == iPodWithDelete) { switch (buttonIndex) { case 0: object.objectImage = nil; pickImage = NO; break; case 1: imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; pickImage = YES; break; default: pickImage = NO; break; } } else if (actionSheet.tag == iPodNoDelete) { switch (buttonIndex) { case 0: imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; pickImage = YES; break; default: pickImage = NO; break; } } if (pickImage) { imagePicker.allowsEditing = YES; [self presentModalViewController:imagePicker animated:YES]; } else { [self setupImageButton]; [self setupChooseImageButton]; } [imagePicker release]; } } Once I get a selection back from the UIImagePickerController, I save 2 images, a resized version of the edited image to use for a thumbnail, and a 800x600 version of the original unedited image into a relationship attribute (Transformational, using the same UIImage to PNG transformations found in the Recipes demo code) for display use: (the resize methods are based on the one demoed in this SO post.) - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { [self dismissModalViewControllerAnimated:YES]; NSManagedObject *oldImage = object.imageFull; if (oldImage != nil) { [object.managedObjectContext deleteObject:oldImage]; } NSManagedObject *image = [NSEntityDescription insertNewObjectForEntityForName:@"Image" inManagedObjectContext:object.managedObjectContext]; object.imageFull = image; UIImage *rawImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; CGSize size = CGSizeMake(800, 600); UIImage *fullImage = [UIImageManipulator scaleImage:rawImage toSize:size]; [image setValue:fullImage forKey:@"imageFull"]; UIImage *processedImage = [UIImageManipulator scaleImage:[info objectForKey:@"UIImagePickerControllerEditedImage"] toSize:CGSizeMake(75, 75)]; object.objectImage = processedImage; [self setupImageButton]; [self setupChooseImageButton]; rawImage = nil; fullImage = nil; processedImage = nil; } When I go through viewDidUnload I am setting self.object = nil, and [object release] during dealloc, but I'm still getting memory warnings after about 10 image changes, with a crash at around 20. It leads me to believe that I am not getting that full image out of memory the correct way. What am I missing here? And on a second note, does the Camera source use significantly more memory than the Photo Albums source? I tend to get more crashes when using the camera.

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Accommodating hierarchical data in SQL Server 2005 database design

- by Remnant

Context I am fairly new to database design (=know the basics) and am grappling with how best to design my database for a project I am currently working on. In short, my database will keep a log of which employees have attended certain health and safety courses throughout the year. There are multiple types of course e.g. moving objects, fire safety, hygiene etc. In terms of my database design I need to accommodate the following: Each location can have multiple divisions Each division can have multiple departments Each department can have multiple functions Each function can have multiple job roles Each job role can have different course requirements Also note that the structure at each location may not be the same e.g. the departments within divisions are not the same across locations and the functions within departments may also differ. Edit - updated to better articulate problem Let's assume I am just looking at Location, Division and Department and I have my database as follows: LocationTable DivisionTable DepartmentTable LocationID(PK) DivisionID(PK) DepartmentID(PK) LocationName DivisionName DepartmentName There is a many-to-many relationship between Locations and Divisions and also between Departments and Divisions. Suppose I set up a 'Junction Table' as follows: Location_Division LocationID(FK) DivisionID(FK) Using Location_Division I could easily pull back the Divisions for any Location. However, suppose I want to pull back all departments for a given Division in a given Location. If I set up another 'Junction Table' for Division and Department then I can't see how I would differentiate Division by Location? Division_Department DivisionID(FK) DepartmentID(FK) Location_Division Division_Department LocationID DivisionID DivisionID DepartmentID 1 1 1 1 1 2 1 2 2 1 2 1 2 2 2 2 Do I need to expand the number of columns in my 'Junction Table' e.g. Location_Division_Department LocationID(FK) DivisionID(FK) DepartmentID(FK) Location_Division_Department LocationID DivisionID DepartmentID 1 1 1 1 1 2 1 1 3 2 1 1 2 1 2 2 1 3

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Objective C, Core Data issue

- by Jaime Rae

I'm following a tutorial in "More iPhone 3 Development. In the code, they have a line: NSManagedObjectContext *managedObjectContext = appDelegate.managedObjectContext; I get an error: "accessing unknown 'managedObjectContext' getter method" on that line. I've downloaded his sample code and his program runs fine with that line of code. I've tried rewriting the code and I've even copied and pasted his code into my program, but I still get the error. I am using the newest SDK, and I'm wondering if something might have changed so this getter method doesn't work anymore, but I do not get any warning about deprecation. Does anyone know what is going on, or better yet, a better way to write this line and not get the error. Thanks LadyDev

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create graph using adjacency list

- by sum1needhelp

#include<iostream> using namespace std; class TCSGraph{ public: void addVertex(int vertex); void display(); TCSGraph(){ head = NULL; } ~TCSGraph(); private: struct ListNode { string name; struct ListNode *next; }; ListNode *head; } void TCSGraph::addVertex(int vertex){ ListNode *newNode; ListNode *nodePtr; string vName; for(int i = 0; i < vertex ; i++ ){ cout << "what is the name of the vertex"<< endl; cin >> vName; newNode = new ListNode; newNode->name = vName; if (!head) head = newNode; else nodePtr = head; while(nodePtr->next) nodePtr = nodePtr->next; nodePtr->next = newNode; } } void TCSGraph::display(){ ListNode *nodePtr; nodePtr = head; while(nodePtr){ cout << nodePtr->name<< endl; nodePtr = nodePtr->next; } } int main(){ int vertex; cout << " how many vertex u wan to add" << endl; cin >> vertex; TCSGraph g; g.addVertex(vertex); g.display(); return 0; }

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Possible Data Execution Prevention problem in Windows 7

- by Joel in Gö

I have a serious problem with my .Net program. It calls a native dll, and then crashes instantly because it can't find a native method. This is behaviour we have seen before, whereby the C# compiler, in its infinite wisdom, sets the flag that the program is DEP compatible, even if it calls a native dll which patently is not. We have the standard workaround for this, where the flag is set to Not DEP Compatible in a post-build step, and this works fine. Everywhere except on my machine. I have Windows 7 32bit, and the program works fine on the Win 7 64bit machines that we have, as well as on Vista and XP; we have not yet been able to check on another Win7 32bit. However, on my machine the DataExecutionPolicy_SupportPolicy is 0, i.e. we have successfully switched DEP off. The dll in question also works fine when called from a native program. We are running out of ideas... any help would be much appreciated!

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nosql modeling : howto (digg as an example) ?

- by Jerome WAGNER

Hello, I am trying to grasp this nosql thing since it sounds good for scalability. Can you help me understand how a digg-like model would be structured efficiently ? where are the users where are the articles where are the notations .. Thanks Jerome

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Core Data - NSPredicate to filter to-many relationship

- by Macatomy

I have 2 entities, Task and List. Each task has a to-one relationship to a List object called "list", and there is an inverse relationship with List, which has a to-many relationship with Task called "tasks". I'm trying to use a fetch request with an NSPredicate to get all the Task objects that belong to a specified List: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"list=%@", theList]; [fetchRequest setPredicate:predicate]; (where "theParent" is a reference to a List object). However this returns no fetched objects. If I take out the predicate, then the objects are returned (so I do know they exist, and by NSLogging theList I know it has Task objects associated with it). Thanks

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WCF DataContracts and underlying data structures

- by Xerx

I am wondering what makes sense in relation to what objects to expose through a WCF service - should I add WCF Serialization specifications to my business entities or should I implement a converter that maps my business entities to the DataContracts that I want to expose through my WCF service? Right now I have entities on different levels: DataAccess, Business and Contract. I have converters in place that can map entities from DataAccess to Business and from Business to Contract and vice versa. Implementing and Maintaining those is time consuming and pretty tedious. What are best practices in relation to this? If I were using an OR/M such as NHibernate or Entity Framework should I be exposing the entities from the ORM directly or should I abstract them the same way I am doing now? Thanks in advance.

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Is there any USB2.0 data transfer chunk size limit?

- by goldenmean

With one read() or write() at a time, can we increase the bulk data size over USB interface? For example, I want to transfer chunk of 1024 (1K) bytes data and if the device has limitations of only 64bytes, is there any way I can increase the packet size for read() and write() system call over USB? Is there any limitation on size of data transfer over USB in a host-device environment?

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fill data in dropdown box as per previous dropdown box data selected in aspnet mvc 1

- by FosterZ

hi, i'm buildin' an employee registration form in aspnet mvc, i have fields like "School" list in 1 dropdown box and "Department" list another, problem is i want to show Department list on change of School list, i have done followin' code: public ActionResult EmployeeCreate() { var getSchool = SchoolRepository.GetAllSchoolsInArray();//this gets school_id as value and school_name as text for dropdown box ViewData["SchoolsList"] = getSchool; return View(); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult EmployeeCreate() { _employeeRepository.CreateEmployee(employeeToCreate); _employeeRepository.SaveToDb(); } Here is the View Html.DropDownList("SchoolLists") Html.DropDownList("DepartmentLists") now, how do i get the departments of selected school in dropdown boxes

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First Letter Section Headers with Core Data

- by Cory Imdieke

I'm trying to create a list of people sorted in a tableView of sections with the first letter as the title for each section - a la Address Book. I've got it all working, though there is a bit of an issue with the sort order. Here is the way I'm doing it now: NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:[NSEntityDescription entityForName:@"Contact" inManagedObjectContext:context]]; NSSortDescriptor *fullName = [[NSSortDescriptor alloc] initWithKey:@"fullName" ascending:YES]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:fullName, nil]; [request setSortDescriptors:sortDescriptors]; [fullName release]; [sortDescriptors release]; NSError *error = nil; [resultController release]; resultController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:context sectionNameKeyPath:@"firstLetter" cacheName:nil]; [resultController performFetch:&error]; [request release]; fullName is a standard property, and firstLetter is a transient property which returns - as you'd expect - the first letter of the fullName. 95% of the time, this works perfectly. The problem is the result controller expects these two "lists" (the sorted fullName list and the sorted firstLetter list) to match exactly. If I have 2 contacts like John and Jack, my fullName list would sort these as Jack, John every time but my firstLetter list might sort them as John, Jack sometimes as it's only sorting by the first letter and leaving the rest to chance. When these lists don't match up, I get a blank tableView with 0 items in it. I'm not really sure how I should go about fixing this issue, but it's very frustrating. Has anyone else run into this? What did you guys find out?

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Problem with Core Data - EXC_BAD_ACCESS

- by BarrettJ

I'm using the following code and I'm getting an EXC_BAD_ACCESS when trying to get the count of objects - anyone have any idea why? Oddly enough, the error only happens if the count should be one or greater, if there are no objects it seems to work fine (it outputs null). NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"TVShow" inManagedObjectContext:[self managedObjectContext]]; [fetchRequest setEntity:entity]; [fetchRequest includesPendingChanges]; //NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ID == %@", showId]; //[fetchRequest setPredicate:predicate]; NSError *error; NSLog(@"Generating Count"); NSUInteger count = [[self managedObjectContext] countForFetchRequest:fetchRequest error:&error]; if(count == NSNotFound) { NSLog(@"error"); } else { NSLog(@"%@", count); // EXC_BAD_ACCESS here } [fetchRequest release];

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Do data sources travel with a particular mail merge document?

- by Andrew

Do data sources that you set up (particularly to SQL Server) travel with a mail merge document? In other words, if I set up data sources in a mail merge document on my machine and then save and send that document to a co-worker and she opens it on her machine, will the data sources still be there when she opens it? Or, will she have to set them up again herself?

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Enterprise Architect Vs IBM InfoSphere Data Architect

- by vrajaraman

We are proimarily going to model databases (mostly sql,db2) for our SOA intiative applications organisation wide. Let me know the highlights between choosing either of this tool and the recommendations out of your expereinces

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Core Data ANY BETWEEN predicate

- by Mike Weller

I'm trying to create an NSPredicate to find 'projects' that contain 'sessions' within a certain date range. I tried this at first: [NSPredicate predicateWithFormat:@"ANY sessions.date BETWEEN {$STARTDATE, $ENDDATE}"]; But I get an exception: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'to-many key not allowed here' It seems BETWEEN does not work with ANY in this way. I'm also limited in use of () and AND clauses meaning I can't use something like: [NSPredicate predicateWithFormat:@"ANY (sessions.date > $STARTDATE && sessions.date < $ENDDATE)"]; If I try that I get a parse error. How can I do this? Thanks UPDATE: Note that this: [NSPredicate predicateWithFormat:@"ANY sessions.date > $STARTDATE && ANY sessions.date < $ENDDATE"]; Is incorrect because it returns a project where there is a session greater than the start date and another session less than the end date but no session in between.

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Using non primitive types in ServiceOperation for WCF Data Service (3.5SP1)

- by Nix

Is there any way at all to create a "mock" entity type for use in a WCF Service Operation? We have some queries we do that we need to optimize by exposing as a ServiceOperation. The problem is in order to do so we would result in a very long list of primitative types... Ex SomeoneHelpMe(int time, string name, string address, string i, string purple, string foo, int stillGoing, int tooMany, etc...) And we really need to reduce this to SomeoneHelpedMe(CustomEntityNotMappedToAnything e) This would also help us when it comes time to write some complex queries since there is a 3 param limitation... I saw this will be possible in 4.0 using "complex types", but i am still in the 3.5SP1 world. Let me know if anyone needs more information.

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- by ebabchick

- by Hoang Pham

- by Chip Gà Con

- by jiewmeng

- by anubhav

- by JJarava

- by Nic Hubbard

- by int3

- by Avinash

- by Gordon Fontenot

- by Remnant

- by Jaime Rae

- by sum1needhelp

- by Joel in Gö

- by Jerome WAGNER

- by Macatomy

- by Xerx

- by goldenmean

- by FosterZ

- by Cory Imdieke

- by BarrettJ

- by Andrew

- by vrajaraman

- by Mike Weller

- by Nix

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