Core data details

I have to use core data in my new application,and i hav to send my data to server through http post ,m a new comer to i Phone devlopment world.I M having no idea. is any who can help me out,code would b appreciated
Thanx in advance

Hi There, This forum isn't really for programming questions, it's more for end-user support.
There are also developer forums and help in Apple Dev Connection
Hope this helps

Similar Messages

Problem with core data and attribute name "description"

I have spent hours tying to figure out this problem.
It appears that is you name an attribute "description", there can be problems at run-time.
Perhaps, it is related to how I am doing things and letting interface builder do all the bindings.
I create a core data application in Xcode.
I create the entity with some attributes in Xcode and then I launch interface builder. I drag a "core data entity" object to the application window. I add a "Master/Detail View".
I save the files and do a compile. When I click on the "add" button, something goes wrong and GDB launches and loads the stack frame into the debugger.
I am using Xcode 3.1.2.

description is the name of a method in the NSObject protocol; try to use another name for your attribute in CoreData, for example myDescription.

Core Data question

Hi all,
I'm hitting a wall trying to figure out how to do this, so hopefully someone can point me in the right direction... I'm also a bit new to Cocoa/Obj-c programming so hopefully this isn't too obvious
I'm building a core data document based app and have my data model designed but I realized that quite a bit of the data should be separate and shared across all documents created in the app. I'd think the easiest way would be to put those entities in a separate data store and load it concurrently in any open documents, but have it be part of the base data model. I'll try to clarify what I'm getting at:
The user can have multiple documents, and possibly multiple open at any given time, and I'll try to use a simplified example
The entities for this application are
Project
ExpenseLog
ExpenseLineItem
Categories
Vendors
The relationships are
ExpenseLog <--->> ExpenseLineItem
ExpenseLog <<---> Vendors
ExpenseLineItem <<---> Categories
Each project gets it's own file, and the application is tracking expenses (think of an ExpenseLog row as an invoice.) Most projects will have common categories and common vendors, but the ExpenseLog is unique to the project. If a user adds a vendor or category to a project, it should add it to the Vendors or Categories entity and be available across all other projects.
From what I was able to find so far, there should be a way to do this, but I have yet to find any detail on how... The second question I have, is that for an application like this would it be better (definitely easier, but better in terms of user experience) to just have a single document that contains all projects and set up a Project <-->>ExpenseLog relationship?
thanks!

Hrm, let me try to rephrase this and see if I can make it clearer...
The application is a core data document based one. The idea is that there is some data that is common to all documents, and some that is unique. I'd like to store the common data in one file that is loaded and accessable across all open documents, and the unique data in each documents own file.
If I open expenselog1 and expenselog2 both documents should have the same list of vendors and categories. If I add a vendor to expenselog1, it should become available in expenselog2 and vice versa. If I open a new document, expenselog3 it should also see all of the above vendors and categories. If I add an entry to expenselog1, it should only be added to that document and saved in it's own file.
I've found some stuff on entity configurations, but apples documentation (at least what I've found so far) has little substance on this point and contains circular references (i.e. car: see automobile, automobile: see car) Also, it states that you can not create cross store relationships. Is the idea that you put an entity into multiple configurations and then if the entity is updated, both configurations are also updated? Or do you have to write code that updates both configurations discretely? Also, all the references I have found so far say to set the configuration for an entity, but it doesn't say how to configure the configuration to access a particular store.
What I'd like is that there is a common file that contains the common entities and a separate file that contains the individual documents so that the documents have access to the common elements.
Thanks.

Core data tutorial

Hi All
does any one have a good example of core data tutorial
something like Staff / Financial year / Holidays
Staff = Staff details
Financial Year = 2009/10, 2010/11 etc
Holidays takes like... date from 01/05/2009 date to 10/05/2009 Type of holiday = Annual Leave Number of days = 10
so If i selected a member of staff it would show their detail and underneath box of finance years and then select a year and all the holidays they have take is displayed
?

did u check
http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/CoreDat a/Articles/cdFetching.html#//apple_ref/doc/uid/TP40002484-SW1
on the left hand side there are couple of examples listed. i have not checked those..maybe you should check those out.

Core Data Document Icon

Hey guys,
I have a document based Core Data application here. When I save a file as Binary/XML I get a standard blank file icon. How do I make sure the user sees a custom icon when saved from my app?
TIA,
Ricky.

rickydamelio wrote:
I have a document based Core Data application here. When I save a file as Binary/XML I get a standard blank file icon. How do I make sure the user sees a custom icon when saved from my app?
You do this for a Core Data app just like you would for any other Cocoa application. And with a core data app most of the details should already be set up for you.
Check out Storing Document Types Information in the Application's Property List for more info.
First you need to create a .icns file containing the icon you want to use for your document. Then add the icns file to the Resources group of your Xcode project so when you build it will get copied into your application bundle. You can create a different .icns file for each type of document, or you can use the same icon file for all your document types if you want them to have the same icon.
Next, expand the "Targets" group in Xcode, select your target and click the "Info" button in the toolbar. Select the "Properties" tab of the Info window. A core data app should already have three document types set up in the list at the bottom the window. Edit the "Icon File" column and add the file name of your .icns file for each document type.
You may want to edit the "Name" column as well. Whatever you put here is what will show up as the "Kind" in the preview column if you select one of your documents in column view or if you do a "Get Info" on one of your documents.
You can also change the "Extensions" column and the "OS Types" column to uniquely associate your documents with your application. But note that if you change these values then your application may have trouble opening _pre-existing documents_ that were created with the original extensions or types. You could manually rename an existing document to remove the old extension and add the new one. Or use the SetFile tool if you needed to change an pre-existing document's OS Type.
The Finder probably won't pick up on these changes right away. You may have to logoff and log back on or force Finder to restart before your changes will be recognized.
Steve

Core data binding not working

in my project I used core data and binding to produce data on document based program.
I have used multiple entities and they worked fine and then they stopped working and I don't know why.
all the text fields now have "()" in them with space in between them, and will not add to the database. so the field shows a junk value and will not bind properly to the database.
how would I start to debug this I have been searching but I don't know where to start, mainly i dont know what the problem is.

Binding works one way. This means that textInput.text changes
to match the value of account.identifier, not the other way around.
While I think it's theoretically possible to create a binding the
other way (I haven't played with binding in ActionScript), it makes
more sense to listen to the TextInput's change event to get changes
to the text field.
Or, you can create a model in the MXML and bind one its
properties to the textinput's value. Look in the docs about the
mx:Model tag for details.

IPhone core data - fetched managed objects not being autoreleased on device (fine on simulator)

I'm currently struggling with a core data issue with my app that defies (my) logic. I'm sure I'm doing something wrong but can't see what. I am doing a basic executeFetchRequest on my core data entity, but the array of managed objects returned never seems to be released ONLY when I run it on the iPhone, under the simulator it works exactly as expected. This is despite using an NSAutoreleasePool to ensure the memory footprint is minimised. I have also checked with Instruments and there are no leaks, just ever increasing allocations of memory (by '[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) allocWithEntity:]'). In my actual app this eventually leads to a didReceiveMemoryWarning call. I have produced a minimal program that reproduces the problem below. I have tried various things such as faulting all the objects before draining the pool, but with no joy. If I provide an NSError pointer to the fetch no error is returned. There are no background threads running.
+(natural_t) get_free_memory {
    mach_port_t host_port;
    mach_msg_type_number_t host_size;
    vm_size_t pagesize;
    host_port = mach_host_self();
    host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    host_page_size(host_port, &pagesize);
    vm_statistics_data_t vm_stat;
    if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {
        NSLog(@"Failed to fetch vm statistics");
        return 0;
    /* Stats in bytes */
    natural_t mem_free = vm_stat.free_count * pagesize;
    return mem_free;
- (void)viewDidLoad
    [super viewDidLoad];
    // Set up the edit and add buttons.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;
    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject)];
    self.navigationItem.rightBarButtonItem = addButton;
    [addButton release];
    // Obtain the Managed Object Context
    NSManagedObjectContext *context = [(id)[[UIApplication sharedApplication] delegate] managedObjectContext];
    // Check the free memory before we start
    NSLog(@"INITIAL FREEMEM: %d", [RootViewController get_free_memory]);
    // Loop around a few times
    for(int i=0; i<20; i++) {
        // Create an autorelease pool just for this loop
        NSAutoreleasePool *looppool = [[NSAutoreleasePool alloc] init];
        // Check the free memory each time around the loop
        NSLog(@"FREEMEM: %d", [RootViewController get_free_memory]);
        // Create a minimal request
        NSEntityDescription *entityDescription = [NSEntityDescription
                                              entityForName:@"TestEntity" inManagedObjectContext:context];
        // 'request' released after fetch to minimise use of autorelease pool
        NSFetchRequest *request = [[NSFetchRequest alloc] init];
        [request setEntity:entityDescription];
        // Perform the fetch
        NSArray *array = [context executeFetchRequest:request error:nil];
        [request release];
        // Drain the pool - should release the fetched managed objects?
        [looppool drain];
    // Check the free menory at the end
    NSLog(@"FINAL FREEMEM: %d", [RootViewController get_free_memory]);
When I run the above on the simulator I get the following output (which looks reasonable to me):
2011-06-06 09:50:28.123 renniksoft[937:207] INITIAL FREEMEM: 14782464
2011-06-06 09:50:28.128 renniksoft[937:207] FREEMEM: 14807040
2011-06-06 09:50:28.135 renniksoft[937:207] FREEMEM: 14831616
2011-06-06 09:50:28.139 renniksoft[937:207] FREEMEM: 14852096
2011-06-06 09:50:28.142 renniksoft[937:207] FREEMEM: 14872576
2011-06-06 09:50:28.146 renniksoft[937:207] FREEMEM: 14897152
2011-06-06 09:50:28.149 renniksoft[937:207] FREEMEM: 14917632
2011-06-06 09:50:28.153 renniksoft[937:207] FREEMEM: 14938112
2011-06-06 09:50:28.158 renniksoft[937:207] FREEMEM: 14962688
2011-06-06 09:50:28.161 renniksoft[937:207] FREEMEM: 14983168
2011-06-06 09:50:28.165 renniksoft[937:207] FREEMEM: 14741504
2011-06-06 09:50:28.168 renniksoft[937:207] FREEMEM: 14770176
2011-06-06 09:50:28.174 renniksoft[937:207] FREEMEM: 14790656
2011-06-06 09:50:28.177 renniksoft[937:207] FREEMEM: 14811136
2011-06-06 09:50:28.182 renniksoft[937:207] FREEMEM: 14831616
2011-06-06 09:50:28.186 renniksoft[937:207] FREEMEM: 14589952
2011-06-06 09:50:28.189 renniksoft[937:207] FREEMEM: 14610432
2011-06-06 09:50:28.192 renniksoft[937:207] FREEMEM: 14630912
2011-06-06 09:50:28.194 renniksoft[937:207] FREEMEM: 14651392
2011-06-06 09:50:28.197 renniksoft[937:207] FREEMEM: 14671872
2011-06-06 09:50:28.200 renniksoft[937:207] FREEMEM: 14692352
2011-06-06 09:50:28.203 renniksoft[937:207] FINAL FREEMEM: 14716928
However, when I run it on an actual iPhone 4 (4.3.3) I get the following result:
2011-06-06 09:55:54.341 renniksoft[4727:707] INITIAL FREEMEM: 267927552
2011-06-06 09:55:54.348 renniksoft[4727:707] FREEMEM: 267952128
2011-06-06 09:55:54.702 renniksoft[4727:707] FREEMEM: 265818112
2011-06-06 09:55:55.214 renniksoft[4727:707] FREEMEM: 265355264
2011-06-06 09:55:55.714 renniksoft[4727:707] FREEMEM: 264892416
2011-06-06 09:55:56.215 renniksoft[4727:707] FREEMEM: 264441856
2011-06-06 09:55:56.713 renniksoft[4727:707] FREEMEM: 263979008
2011-06-06 09:55:57.226 renniksoft[4727:707] FREEMEM: 264089600
2011-06-06 09:55:57.721 renniksoft[4727:707] FREEMEM: 263630848
2011-06-06 09:55:58.226 renniksoft[4727:707] FREEMEM: 263168000
2011-06-06 09:55:58.726 renniksoft[4727:707] FREEMEM: 262705152
2011-06-06 09:55:59.242 renniksoft[4727:707] FREEMEM: 262852608
2011-06-06 09:55:59.737 renniksoft[4727:707] FREEMEM: 262389760
2011-06-06 09:56:00.243 renniksoft[4727:707] FREEMEM: 261931008
2011-06-06 09:56:00.751 renniksoft[4727:707] FREEMEM: 261992448
2011-06-06 09:56:01.280 renniksoft[4727:707] FREEMEM: 261574656
2011-06-06 09:56:01.774 renniksoft[4727:707] FREEMEM: 261148672
2011-06-06 09:56:02.290 renniksoft[4727:707] FREEMEM: 260755456
2011-06-06 09:56:02.820 renniksoft[4727:707] FREEMEM: 260837376
2011-06-06 09:56:03.334 renniksoft[4727:707] FREEMEM: 260395008
2011-06-06 09:56:03.825 renniksoft[4727:707] FREEMEM: 259932160
2011-06-06 09:56:04.346 renniksoft[4727:707] FINAL FREEMEM: 259555328
The amount of free memory reduces each time round the loop in proportion to the managed objects I fetch e.g. if I fetch twice as many objects then the free memory reduces twice as quickly - so I'm pretty confident it is the managed objects that are not being released. Note that the entities that are being fetched are very basic, just two attributes, a string and a 16 bit integer. There are 1000 of them being fetched in the examples above. The code I used to generate them is as follows:
// Create test entities
for(int i=0; i<1000; i++) {
    id entity = [NSEntityDescription insertNewObjectForEntityForName:@"TestEntity" inManagedObjectContext:context];
    [entity setValue:[NSString stringWithFormat:@"%d",i] forKey:@"name"];
    [entity setValue:[NSNumber numberWithInt:i] forKey:@"value"];
if (![context save:nil]) {
    NSLog(@"Couldn't save");
If anyone can explain to me what is going on I'd be very grateful! This issue is the only only one holding up the release of my app. It works beautifully on the simulator!!
Please let me know if there's any more info I can supply.

Update: I modified the above code so that the fetch (and looppool etc.) take place when a timer fires. This means that the fetches aren't blocked in viewDidLoad.
The result of this is that the issue happens exactly as before, but the applicationDidReceiveMemoryWarning is fired as expected:
2011-06-08 09:54:21.024 renniksoft[5993:707] FREEMEM: 6131712
2011-06-08 09:54:22.922 renniksoft[5993:707] Received memory warning. Level=2
2011-06-08 09:54:22.926 renniksoft[5993:707] applicationDidReceiveMemoryWarning
2011-06-08 09:54:22.929 renniksoft[5993:707] FREEMEM: 5615616
2011-06-08 09:54:22.932 renniksoft[5993:707] didReceiveMemoryWarning
2011-06-08 09:54:22.935 renniksoft[5993:707] FREEMEM: 5656576

I am being asked to upgrade to iCloud Drive but indications are that I will not be able to access up to date details on any of my documents on my Mac without going into iCloud first. Have I got this interpretation right or can I save changes to acce

I am being asked to upgrade to iCloud Drive but indications are that I will not be able to access up to date details on any of my documents on my Mac without going into iCloud first. Have I got this interpretation right or can I save changes to access the new versions on my iMac?

That is Apple's statement:
Using iWork with iCloud Drive - Apple Support
Options for iWork customers
You can upgrade to iCloud Drive today if you want to keep your documents up to date in iOS 8 and OS X Yosemite, and you want to use the iWork web apps on iCloud.com and the Share via iCloud feature.
You can upgrade to iCloud Drive later if you want to keep your documents up to date with your apps on iOS 7 or earlier and OS X Mavericks or earlier.
Upgrade to iCloud Drive today
To access the most recent versions of your documents from a Mac with OS X Mavericks or earlier, you’ll need to go to iCloud.com and access Pages, Numbers, and Keynote from there. On a PC, you can install iCloud for Windows and set up iCloud Drive.
If you upgrade to iCloud Drive now:
Your documents will keep up to date across devices with iOS 8, Macs with OS X Yosemite, PCs with iCloud for Windows, and iCloud.com.
Your documents will no longer keep up to date on devices with iOS 7 and Macs with OS X Mavericks or earlier.
You’ll be able to use the iWork web apps on iCloud.com.
You’ll be able to use the Share via iCloud feature with iOS 8, OS X Yosemite, and iCloud.com.
Documents you previously shared via iCloud will be accessible to collaborators.
Upgrade to iCloud Drive later
Note that until you upgrade your iCloud account to iCloud Drive, you won’t be able to use the iWork web apps on iCloud.com or the Share via iCloud feature. If you don’t upgrade to iCloud Drive at this time:
Your documents will keep up to date across devices with iOS 8 and across devices with iOS 7 and Macs with OS X Mavericks or earlier.
You won’t be able to use the iWork web apps on iCloud.com.
You won’t be able to use the Share via iCloud feature.
Documents you previously shared via iCloud won’t be accessible to collaborators until you upgrade to iCloud Drive.

Best path for Core Data implementation

Hi all,
First post so pls go easy!
I'm a seasoned Windows/Web App developer who has recently (3-4m) discovered Mac, Cocoa and Obj-C. I've been buried in Apple docs, Hillegass and Dalrymple books for some time now trying to get to the point where I'm ready to build the Cocoa project that I have in mind, which looks to be well suited to a Core Data based Application driven by SQLite. The data model is reasonably complex with around 10 inter-related entities which must retain data integrity.
Anyway, onto the question... historically I would have built a class library to encapsulate the use of the data model and accessed that class library when events fired to do what needs to be done. The Cocoa solution appears to support this - presumably though creating my own framework that is then referenced by the Cocoa application. I can see though that there is another path where I skip the encapsulation and build a Core Data based Cocoa app directly.
At a high level - is there a preference between the two approaches?
The latter seems well documented/supported but I am synically thinking that is because it is more straightforward and clearly faster, are there other advantages such as performance.
For background the app when running will follow similar form to Mail.app in terms of multi-view with some data tables and custom views in play.
Thanks,
Chris

Hi K T - thanks.
Bottom line I think is that encapsulation is a safety blanket that I probably need to let go of. CD ticks boxes on a theory level, subject to implementation not being too heavy it seems like the logical step. The only consideration was to encapsulate a framework built on the known methods, then move the framework to CD under the covers when ready - that seems a bit gutless though and almost definitely inefficient time wise. I guess that there is little point in encapsulating CD from the outset - feel like it just adds unnecessary work in addition to some degree of performance overhead?
{quote}Are you looking for flexibility or performance, by the way?{quote}
Performance - the data model is unlikely to change once bedded in beyond addition of properties etc very infrequently. The app is likely to need to handle many tens of thousands of rows of data (albeit small in terms of data volume per row) for some users, and my conclusion from the documentation was that SQLite is the most appropriate route if committing to CD where data volume and/or relationships are plentiful. Is that a fair assessment?
{quote}Are you looking to mimic traditional application interfaces or to adopt trends that are currently unfolding?{quote}
The app I plan to build desperately needs to be brought up to date - possibly even beyond the advanced UI that AppKit seems to offer by default IMO. That said I don't want to overcommit on the extent of the build, but I do want to turn heads without just slapping coverflow or similar in for the sake of it. If you have any references or examples for doable leading edge UI design on OSX they would be gratefully received.
Thanks again for your help - really appreciate it.
Chris

Vendor master data details

Hello Friends,
i have one requirement like...
We need a download of Vendor master data details with the following data:
1) Company Code
2) Vendor number
3) Vendor Name
4) Vendor country code
4) Bank key
5) Swift code (BIC code)
6) Bank account
7) IBAN code
i have tried to develop one report in SQVI transaction. i have taken tables LFA1,LFB1,LFBK.BKNA and TIBAN.
But i could not able map Bank account number between the tables BKNA and TIBAN.
Could you please help on this topic...
Regards,
Satya

Hi,
BNKA is the table of banks, not bank accounts; it doesn't contain bank account numbers.
You will find swift code in BNKA-SWIFT
with keys
BNKA-BANKS = LFBK-BANKS
BNKA-BANKL = LFBK-BANKL
and IBAN in TIBAN-IBAN
with keys
TIBAN-BANKS = LFBK-BANKS
TIBAN-BANKL = LFBK-BANKL
TIBAN-BANKN = LFBK-BANKN
TIBAN-BKONT = LFBK-BKONT

Best practice for core data managed objects

Hello
I'd like to konw if there is a document available listing the good practices when managing core data managed objects.
For example should I keep those objects in memory in a singleton class, or save thme to the DB and load them when needed, ... I am trying to figure out how to manage Annotation views representing managed objects when using the MapKit.
Thanks

Seen this?
Using Managed Objects

Should I use Core Data?

I'm starting a new document-based application. Is Core Data the way of the future, or just a convenience for specific types of apps? That is, in the "old days" you would override -[NSDocument dataOfType:] and readFromData: to archive your objects. It seems appealing to use Core Data and get automatic archiving in XML, SQL, and binary all for free, but the tutorials I've gone through all seem directed at a very different kind of app than mine. (Rather database-like, but I suppose the demo has to look like something.) The old "Sketch" example, which uses old-style archiving, hasn't been updated in years. Which direction to go?

Look up HyperCard in Wikipedia for a good explanation. In short, I'm developing a GUI-based mini-app environment, where users can create buttons & fields, and hook them up with an elementary scripting language. I've written the compiler & interpreter, am starting the surrounding framework.
"Have you looked at the Apple HIGs lately?" Dude, I was reading "Inside Macintosh" back in 1984.
Mobile platform? Since I'm using garbage collection, I'm shut out of iPhone/iPad, at least for the time being.

How to implement parent entity for core data

Hi there.
I am starting a document-based Core Data application (Cocoa) and developed the following data model;
The 'invoice' entity is a parent entity of 'items', because ideally I would want there to be many items for each invoice. I guess my first point here is - is what I am trying to do going to be achieved using this method?
If so, I have been trying several ways in Interface Builder to sort out how to implement this structure with cocoa bindings. I have made a Core Data app before, just with one entity. So this time, I have two separate instances of NSArrayController's connected to tables with relevant columns. I can add new 'invoice' entities fine, but I can't get corresponding 'items' to add.
I tried setting the Managed Object Context of the 'item' NSArrayController to this;
I thought this would resolve the issue, but I still have found no resolution to the problem.
If anyone done something similar to this, I'd appreciate any help
Thanks in advance,
Ricky.

Second, when you create a Core Data Document Based application, XCode generates the MyDocument class, derivating from NSPersistentDocument. This class is dedicated to maintain the Managed Object Model and the Managed Object Context of each document of your application.
There is only one Context and generally one Model for each Document.
In Interface Builder, the Managed Object Context must be bound to the managedObjectContext of the MyDocument instance: it's the File's owner of the myDocument.xib Nib file.
It's not the case in your Nib File where the Managed Object Context is bound to the invoiceID of the Invoice Controller.
It's difficult to help you without an overall knowledge of your application, perhaps could you create an InvoiceItem Controller and bind its Content Set to the relationship of your invoice.

Problem with "user data detail"

Hi I am using EDQ 9.0.6 in Window 7 platform.
I need some support from the community on how to make "user data detail" tool work.
As show in the picture in the link,
http://img843.imageshack.us/img843/5985/vend.jpg in The datapane, there is no user data detail show.
also as the result i am also unabe to make user notification by email work.
I will be very much appliciate for all the help i can get.
Thanks in advance
Supanut

Thank you for your helpful reply.
I make a test and it is really as you and the help file stated.
It is working on realtime data input.
If you would be kind to help me more,
My destination data table has a field named "UPDATE_USER" to record name of who put or update the data.
Are there anyway to link EDQ username to be put in the output data so that non EDQ user know which of the edq user put the data in?

Using core data with a database

Here is where I am at. I have a trivia app in development that will have over 1000 questions, so a database is inevitable. We recently created a test sqlite database and read in some entries and it worked.
We were looking into exploiting the features of Core Data in our app, but this would involve creating a set of managed objects, a context, and the essentials for a Core Data scheme to function, and then use these models to fetch data from a database.
The database is not created yet. We are starting fresh and simply wish to see if we can use core data to work with a database that could be created once the model is in place. Is it possible to create a 1000 or more entry database whose entries could relate to a Core Data entity or set of entities, and then use Core Data to fetch the data from these entries as we please?

We will not be reusing any code. I apologize for the confusion. This is the start of the app regarding database management, and we have not yet created the database that will hold the questions for this app.
Alright, so you two are both suggesting to set up a model and allow the creation of the sqlite store, which if my research is correct, involves a .sqlite file with a "Z_" following each attribute, and then adding entries here. This sounds fair enough. I had not known if this was going against the mainstream use of core data or not.
Thanks you two. I'm going to leave the question open for a little while longer to see if any other opinions come up.

Core data details

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