nsmanagedobject - Objective C - Core Data record update -

i have update records in core data. right way?

nsmanagedobjectcontext *context = [self managedobjectcontext]; nsmutablearray *poifromcd=(nsmutablearray *)[self takepoifromcoredata];  (int i=0; i<[array count]; i++) {   (int j=0; j<[poifromcd count]; j++) {     poi *poi=(poi *)[poifromcd objectatindex:j];     if ([[[array objectatindex:j]objectforkey:@"poiid"]isequaltostring:poi.poiid]) {       poi *p=[poifromcd objectatindex:j];       p.poiid=[[array objectatindex:i]objectforkey:@"poiid"];       p.lastmod=[[array objectatindex:i]objectforkey:@"lastmod"];    } else {       poi *p;       p=[nsentitydescription insertnewobjectforentityforname:@"poi" inmanagedobjectcontext:context];       p.poiid=[[array objectatindex:i]objectforkey:@"poiid"];       p.lastmod=[[array objectatindex:i]objectforkey:@"lastmod"];    }  } }  nserror *error; if (![context save:&error]) { nslog(@"errore durante il salvataggio: %@", [error localizeddescription]); } 

i pass array method, , take data in coredata , put in poifromcd.

please, if had wrong, point me right way! :)

no, not standard way update core data objects. trying treat core data sql , won't work.

core data not sql. entities not tables. objects not rows or records. attributes not columns. core data object graph management system may or may not persist object graph , may or may not use sql far behind scenes so. trying think of core data in sql terms cause misunderstand core data , result in grief , wasted time.

i can't quite tell trying without knowing data model looks have step through arrays of objects this.