I am getting only last record from coredata? below is the my code .
NSManagedObjectContext *context = ((AppDelegate*)[[UIApplication sharedApplication] delegate]).persistentContainer.viewContext;
NSManagedObject *object = [NSEntityDescription insertNewObjectForEntityForName:#"Company"
inManagedObjectContext:context];
[object setValue:#"infosys" forKey:#"cname"];
[object setValue:#"01" forKey:#"compID"];
[object setValue:#"Pune" forKey:#"locaation"];
[object setValue:#"wipro" forKey:#"cname"];
[object setValue:#"02" forKey:#"compID"];
[object setValue:#"Mumbai" forKey:#"locaation"];
NSError *error;
if (![context save:&error]) {
NSLog(#"Failed to save - error: %#", [error localizedDescription]);
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Company" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *result = [context executeFetchRequest:fetchRequest error:&error];
if (result.count<=0) {
NSLog(#"No User Found");
}
else{
NSString *cname;
NSString *compID;
NSString *locaation;
for (NSManagedObject *obj in result) {
cname=[obj valueForKey:#"cname"];
compID=[obj valueForKey:#"compID"];
locaation=[obj valueForKey:#"locaation"];
}
NSLog(#"Store Data = %#",[NSString stringWithFormat:#"%# %# %#",cname,compID,locaation]);
}
Add objects like this,
NSManagedObject *object = [NSEntityDescription insertNewObjectForEntityForName:#"Company" inManagedObjectContext:context];
[object setValue:#"infosys" forKey:#"cname"];
[object setValue:#"01" forKey:#"compID"];
[object setValue:#"Pune" forKey:#"locaation"];
NSManagedObject *object2 = [NSEntityDescription insertNewObjectForEntityForName:#"Company" inManagedObjectContext:context];
[object2 setValue:#"wipro" forKey:#"cname"];
[object2 setValue:#"02" forKey:#"compID"];
[object2 setValue:#"Mumbai" forKey:#"locaation"];
NSError *error;
if (![context save:&error]) {
NSLog(#"Failed to save - error: %#", [error localizedDescription]);
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Company" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *result = [context executeFetchRequest:fetchRequest error:&error];
if (result.count<=0) {
NSLog(#"No User Found");
}
else{
NSString *cname;
NSString *compID;
NSString *locaation;
for (NSManagedObject *obj in result) {
cname=[obj valueForKey:#"cname"];
compID=[obj valueForKey:#"compID"];
locaation=[obj valueForKey:#"locaation"];
NSLog(#"Store Data = %#",[NSString stringWithFormat:#"%# %# %#",cname,compID,locaation]);
}
}
Related
i am new to core data..
I know how to store and item.
- (void)dbSave:(NSString *)uri withContent:(NSDictionary *)content withExpiry:(double)date {
Cache *cache = [self dbLoad:uri];
if (cache == nil) {
cache = [NSEntityDescription insertNewObjectForEntityForName:#"Cache" inManagedObjectContext:[self managedObjectContext]];
}
double time = (double) [[NSDate date] timeIntervalSince1970] + date;
[cache setLocal:uri];
[cache setTime:#(time)];
NSMutableData *data = [[NSMutableData alloc] init];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:content forKey:#"data"];
[archiver finishEncoding];
[cache setData:data];
NSError *error;
if (![[self managedObjectContext] save:&error]) {
}
}
But i am stuck with creating a method to clear this core data data base.. Does anyone know how?
NSManagedObjectContext *managedObjectContext=[appDelegate managedObjectContext];
NSFetchRequest *fetchRequest=[NSFetchRequest fetchRequestWithEntityName:#"entity"];
NSArray* currentRecord = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy];
if (currentRecord.count)
{
for (NSManagedObject *obj in currentRecord)
{
[managedObjectContext deleteObject:obj];
}
NSError * error = nil;
if (![managedObjectContext save:&error])
NSLog(#"Can't save ! %# %#",error,[error localizedDescription]);
else
NSLog(#"Data deleted");
}
use this
NSManagedObjectContext *managedContext = [[APP_DELEGATE dbManagerObj] newPrivateContext];
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:#"Cache"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"isUserData = %#",[NSNumber numberWithBool:true]];
[fetchRequest setPredicate:predicate];
if (IS_IOS9_ANDABOVE) {
NSBatchDeleteRequest *batchDeleteRequest = [[NSBatchDeleteRequest alloc]initWithFetchRequest:fetchRequest];
[[[APP_DELEGATE dbManagerObj]persistentStoreCoordinator]executeRequest:batchDeleteRequest withContext:managedContext error:nil];
}
else
{
NSArray *userRelatedDay = [managedContext executeFetchRequest:fetchRequest error:nil];
for (NSManagedObject *object in userRelatedDay) {
[managedContext deleteObject:object];
}
}
I am new in iOS and I am facing a problem regarding to update value of coredata.
For Save
NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject *device;
if (self.device) {
// Update existing device
[device setValue:GlobalIndexPath forKey:#"key"];
} else {
// Create a new device
NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:#"Device" inManagedObjectContext:context];
[newDevice setValue:GlobalIndexPath forKey:#"key"];
}
NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
NSLog(#"Can't Save! %# %#", error, [error localizedDescription]);
}
My code to fetch core data is
NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:#"EntityName" inManagedObjectContext:context]];
NSError *error = nil;
NSArray *results = [context executeFetchRequest:request error:&error];
And to update I and using code
NSManagedObject* favoritsGrabbed = [results objectAtIndex:0];
[favoritsGrabbed setValue:#"1" forKey:#"Key"];
Update code not update it add one object.
Note - GlobalIndexPath is a name of string.
But this is not working for me any suggestion. Thanks in Advcance!
You need to save the context every time you make changes to any NSManagedObject and want it to persist. Try this:
NSManagedObject* favoritsGrabbed = [results objectAtIndex:0];
[favoritsGrabbed setValue:#"1" forKey:#"Key"];
NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
NSLog(#"Can't Save! %# %#", error, [error localizedDescription]);
}
I am trying to store product in sqlite. When i setValue for database entity then i store correct value.
But problem is that i make a check if product is already in database then it should not add same product again. But next time it store NULL value in database.
Although i am not calling [addToFav setValue:#"My Value"];
Simply its check in for loop. When my loop runs it won't go in first condition where i make counter if(count == 0)
I don't know where from its storing NULL value. While i am not calling it any where else. So how its storing NULL value in database ?
- (IBAction)buttonAddToFavourite:(id)sender {
int count = 0;
NSManagedObjectContext *context = [self managedObjectContext];
NSError *error=nil;
NSManagedObject *addToFav = [NSEntityDescription insertNewObjectForEntityForName:#"Favourite" inManagedObjectContext:context];
NSString *dish = [results objectForKey:#"id"];
fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:#"Favourite" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
for (NSManagedObject *info in fetchedObjects) {
NSString *id1 = [info valueForKey:#"dishid"];
if ([id1 isEqualToString:dish]) {
count = count +1;
}
}
if (count == 0) {
[addToFav setValue:[results objectForKey:#"id"] forKey:#"dishid"];
[CSNotificationView showInViewController:self
tintColor:[UIColor greenColor]
image:[UIImage imageNamed:#"sucess"]
message:#"Saved As Favourite."
duration:2.0f];
[self.permanentNotification setShowingActivity:YES];
}
else if (count > 0){
[CSNotificationView showInViewController:self
tintColor:[UIColor redColor]
image:[UIImage imageNamed:#"warning"]
message:#"Dish Already Added."
duration:2.0f];
[self.permanentNotification setShowingActivity:YES];
}
if (![context save:&error]) {
NSLog(#"Can't Save! %# %#", error, [error localizedDescription]);
}
}
- (IBAction)buttonAddToFavourite:(id)sender {
NSError *error = nil;
NSString *dishId = results[#"id"];
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:#"Favourite"];
[fetchRequest setPredicate:[NSPredicate predicateWithFormat:#"dishid == %#", dishId]];
NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];
if (fetchedObjects.count) {
[CSNotificationView showInViewController:self
tintColor:[UIColor redColor]
image:[UIImage imageNamed:#"warning"]
message:#"Dish Already Added."
duration:2.0f];
[self.permanentNotification setShowingActivity:YES];
}
else {
Favourite *obj = [NSEntityDescription insertNewObjectForEntityForName:#"Favourite" inManagedObjectContext:self.managedObjectContext];
obj.dishid = dishId;
[CSNotificationView showInViewController:self
tintColor:[UIColor greenColor]
image:[UIImage imageNamed:#"sucess"]
message:#"Saved As Favourite."
duration:2.0f];
[self.permanentNotification setShowingActivity:YES];
if (![context save:&error]) {
NSLog(#"Can't Save! %# %#", error, [error localizedDescription]);
}
}
}
In this tutorial http://www.raywenderlich.com/934/core-data-tutorial-for-ios-getting-started, the author creates two classes FailedBankInfo and FailedBankDetails from two core data entities, which have a relationship between them, and when he assigns the object failedBankDetails to the name of the relationship details on the failedBankInfo object/pointer like this
failedBankInfo.details = failedBankDetails;
it generates this error
implicit conversion of an objective-c pointer to 'int *' is disallowed with arc
and the same error is generated when he assigns info.details to the pointer FailedBankDetails * details
for (FailedBankInfo *info in fetchedObjects) {
NSLog(#"Name: %#", info.name);
FailedBankDetails *details = info.details;
NSLog(#"Zip: %#", details.zip);
}
Can you explain why this is happening?
This is the full code that he instructs reader to insert into applicationDidFinishLaunching
NSManagedObjectContext *context = [self managedObjectContext];
FailedBankInfo *failedBankInfo = [NSEntityDescription
insertNewObjectForEntityForName:#"FailedBankInfo"
inManagedObjectContext:context];
failedBankInfo.name = #"Test Bank";
failedBankInfo.city = #"Testville";
failedBankInfo.state = #"Testland";
FailedBankDetails *failedBankDetails = [NSEntityDescription insertNewObjectForEntityForName:#"FailedBankDetails"
inManagedObjectContext:context];
failedBankDetails.closeDate = [NSDate date];
failedBankDetails.updateDate = [NSDate date];
failedBankDetails.zip = [NSNumber numberWithInt:12345];
failedBankDetails.info = failedBankInfo;
failedBankInfo.details = failedBankDetails;
NSError *error;
if (![context save:&error]) {
NSLog(#"Whoops, couldn't save: %#", [error localizedDescription]);
}
// Test listing all FailedBankInfos from the store
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"FailedBankInfo"
inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
for (FailedBankInfo *info in fetchedObjects) {
NSLog(#"Name: %#", info.name);
FailedBankDetails *details = info.details;
NSLog(#"Zip: %#", details.zip);
}
Before generating classes for the entities, he performed the same task/test just using the managedObject and there was no problem
NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject *failedBankInfo = [NSEntityDescription
insertNewObjectForEntityForName:#"FailedBankInfo"
inManagedObjectContext:context];
[failedBankInfo setValue:#"Test Bank" forKey:#"name"];
[failedBankInfo setValue:#"Testville" forKey:#"city"];
[failedBankInfo setValue:#"Testland" forKey:#"state"];
NSManagedObject *failedBankDetails = [NSEntityDescription
insertNewObjectForEntityForName:#"FailedBankDetails"
inManagedObjectContext:context];
[failedBankDetails setValue:[NSDate date] forKey:#"closeDate"];
[failedBankDetails setValue:[NSDate date] forKey:#"updateDate"];
[failedBankDetails setValue:[NSNumber numberWithInt:12345] forKey:#"zip"];
[failedBankDetails setValue:failedBankInfo forKey:#"info"];
[failedBankInfo setValue:failedBankDetails forKey:#"details"];
NSError *error;
if (![context save:&error]) {
NSLog(#"Whoops, couldn't save: %#", [error localizedDescription]);
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:#"FailedBankInfo" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
for (NSManagedObject *info in fetchedObjects) {
NSLog(#"Name: %#", [info valueForKey:#"name"]);
NSManagedObject *details = [info valueForKey:#"details"];
NSLog(#"Zip: %#", [details valueForKey:#"zip"]);
}
That looks as if the "details" property of "FailedBackInfo" is declared as
#property (nonatomic) int *details;
and not – as it should be – as
#property (nonatomic, retain) FailedBankDetails *details;
In the tutorial it says you can change the type of the info/detail variable in the h file depending on which one you create first manually. I found that this didn't work. I think your problem may be solved by deleting the subclass that you created first and then recreating it. That way it should link up with the entity relationships to info/detail (whichever you did second) properly
Even though I don't have more than 3 records in my table , and a single table. Method : executeFetchRequest takes too long
loanIDArray=[[NSMutableArray alloc]init];
appDelegate=[[UIApplication sharedApplication] delegate];
context=[appDelegate managedObjectContext];
entityDesc=[NSEntityDescription entityForName:#"Personal_Info" inManagedObjectContext:context];
NSFetchRequest* request=[[NSFetchRequest alloc]init];
[request setEntity:entityDesc];
NSPredicate* predicate=[NSPredicate predicateWithFormat:#"status_of_form==%#",#"Completed"];
[request setPredicate:predicate];
NSError* fetchError;
NSError* error;
This line takes too long
NSArray* objects = [context executeFetchRequest:request error:&fetchError];
if (!fetchError) {
for (NSManagedObject* obj in objects) {
[loanIDArray addObject:[obj valueForKey:#"app_id"]];
}
}
else
NSLog(#"Status Fetch Error : %#",fetchError.description);
[context save:&error];
if (!error)
NSLog(#"count : %d",loanIDArray.count );
else
NSLog(#"error : %#",error.description);
try replace this code:
if (!fetchError) {
for (NSManagedObject* obj in objects) {
[loanIDArray addObject:[obj valueForKey:#"app_id"]];
}
}
with this to avoid iteration:
if (!fetchError) {
loanIDArray = [objects valueForKeyPath:#"app_id"];
}
Try this.
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc]init];
[fetchRequest setEntity:entityDesc];
NSError *error = nil;
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"status_of_form==%#",#"Completed"];
[fetchRequest setPredicate:predicate];
NSArray *request = [context executeFetchRequest:fetchRequest error:&error];
if (!request.count==0) {
for (int i = 0; i<=request.count-1;i++) {
NSManagedObject *obj = [request objectAtIndex:i];
[loanIDArray addObject:[obj valueForKey:#"app_id"]];
}
}