在Realm中存储“unsigned long long”号码的最佳实践解决方案

Question

我必须在Realm存储空间中存储大量数字，例如14000822124935161134。目前我通过将它们的类型更改为string来存储它们，如下所示，然后将其保存：

    NSMutableDictionary *itemInsert = [item mutableCopy];

    if([item valueForKey:@"timestamp"]) {
        unsigned long long timestamp = [[item valueForKey:@"timestamp"] unsignedLongLongValue];
        [itemInsert setObject:[NSString stringWithFormat:@"%llu", timestamp] forKey:@"timestamp"];
    }

    RLMRealm *realm = [RLMRealm defaultRealm];
    [realm beginWriteTransaction];
    [RMember createOrUpdateInRealm:realm withValue:itemInsert];
    [realm commitWriteTransaction];

我的timestamp的{​​{1}}属性定义如下：

RLMObject

@interface RMember : RLMObject ... @property (nullable) NSString *timestamp; ... @end 中的此类数据或更好的解决方案是否有合适的类型而不是string？

Answer 1

Realm支持long long;它只是不支持unsigned变体。

您可以简单地将值保存为long long，并提供一个getter访问器，当从数据库中检索时，它会显式地将其强制转换回unsigned long long。

@interface RMember : RLMObject
@property long long timestamp;
@end

unsigned long long timestamp = [[item valueForKey:@"timestamp"] unsignedLongLongValue];

RLMRealm *realm = [RLMRealm defaultRealm];
RMember *myObject = ...;
[realm transactionWithBlock:^{
    myObject.timestamp = (long long)timestamp;
}];

unsigned long long savedTimestamp = (unsigned long long)myObject.timestamp;
NSLog(@"Saved timestamp is %llu", savedTimestamp);

在我的iPad Air上测试过它似乎按预期工作：