如何将 table 值存储到 IOS 中的核心数据实体中

Question

我有这样的数据：

Appliance        Average Power Rating (Watts)   Alternate  Power Rating (Watts)
Fridge/Refrigerator       120                                       55 
Microwave                 1000                                     1000 
Mixie                     700                                       200 
Roti Maker                30                                        300

我想将此数据存储到我在 CoreData 中的实体中。我刚刚创建了一个名为 EY_Appliance 的实体，其属性为 applianceId、applianceName、watts 和 amountPerWatts.

Answer 1

你得这么写代码。这将为您的实体插入具有以下属性的新对象。您可以根据需要进行编辑。

NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject *powerDesc = [NSEntityDescription insertNewObjectForEntityForName:@"EY_Appliance" inManagedObjectContext:context];


[powerDesc setValue:self.applianceId.text forKey:@"applianceId"];
[powerDesc setValue:self.applianceName.text forKey:@"applianceName"];
[powerDesc setValue:self.watts.text forKey:@"watts"];
[powerDesc setValue:self.amountPerWatts.text forKey:@"amountPerWatts"];

// Save the context
NSError *error = nil;
if (![context save:&error]) {
    NSLog(@"Saving Failed!, Error and its Desc %@ %@", error, [error localizedDescription]);
}

Answer 2

为此，您可以按如下方式创建和添加核心数据对象

NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject *object = [NSEntityDescription insertNewObjectForEntityForName:@"EY_Appliance" inManagedObjectContext:context];
[object setValue:self.applianceIdValue forKey:@"applianceId"];
[object setValue:self.applianceNameValue forKey:@"applianceName"];
[object setValue:self.wattsValue forKey:@"watts"];
[object setValue:self.amountPerWattsValue forKey:@"amountPerWatts"];
NSError *error = nil;
if (![context save:&error]) {
NSLog(@"Saving Failed with error %@", error);
}

如何将 table 值存储到 IOS 中的核心数据实体中

How to store table value into core data entity in IOS

entity

row

core-data

objective-c

ios