Databases
StackOverflow2013
Postsdbo
POLoading csv file in Core Data
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POLoading csv file in Core Data
    primarykey
    data
    text
    <p>I am trying to load a csv file in core data when the application is ran for the first time. On another post on stackoverflow found here (<a href="https://stackoverflow.com/questions/10443936/what-is-the-fastest-way-to-load-a-large-csv-file-into-core-data">What is the fastest way to load a large CSV file into core data</a>), I found out how to do that. </p> <p>I am using the same code form the provided function: populateDB, in my controller and calling the function if the data has never been loaded before (first run). However, xcode is giving me an error:</p> <pre><code>No visible @interface for ...Controller declares the selector persistentStoreCoordinator. </code></pre> <p>The function is:</p> <pre><code>-(void)populateDB{ NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator]; NSManagedObjectContext *context; if (coordinator != nil) { context = [[NSManagedObjectContext alloc] init]; [context setPersistentStoreCoordinator:coordinator]; } NSString *filePath = [[NSBundle mainBundle] pathForResource:@"input" ofType:@"txt"]; if (filePath) { NSString * myText = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil]; if (myText) { __block int count = 0; [myText enumerateLinesUsingBlock:^(NSString * line, BOOL * stop) { line=[line stringByReplacingOccurrencesOfString:@"\t" withString:@" "]; NSArray *lineComponents=[line componentsSeparatedByString:@" "]; if(lineComponents){ if([lineComponents count]==3){ float f=[[lineComponents objectAtIndex:0] floatValue]; NSNumber *number=[NSNumber numberWithFloat:f]; NSString *string1=[lineComponents objectAtIndex:1]; NSString *string2=[lineComponents objectAtIndex:2]; NSManagedObject *object=[NSEntityDescription insertNewObjectForEntityForName:@"Bigram" inManagedObjectContext:context]; [object setValue:number forKey:@"number"]; [object setValue:string1 forKey:@"string1"]; [object setValue:string2 forKey:@"string2"]; NSError *error; count++; if(count&gt;=1000){ if (![context save:&amp;error]) { NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]); } count=0; } } } }]; NSLog(@"done importing"); NSError *error; if (![context save:&amp;error]) { NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]); } } } } </code></pre> <p>I am picking up iOS again after 3 years of absence and I have never dived into this part of the SDK before. I would greatly appreciate any help with this issue...</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USrkh
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COThanks @GabrielePetronella for the edit/lesson here :)
      singulars
      1. POLoading csv file in Core Data
      1. USrkh
    2. COWe meet again :) Just a quick remark, since we are here: instead of including the answer in the question, you should post an answer. If you believe it's most suitable answer you can also accept it (after 2 days)
      singulars
      1. POLoading csv file in Core Data
      1. USGabriele Petronella
    3. COShould I go ahead and update then?
      singulars
      1. POLoading csv file in Core Data
      1. USrkh
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload