Question

我使用以下代码通过coredata访问JSON值，

 NSManagedObjectContext *context = [[DataAccessLayer sharedInstance] managedObjectContext];
 NSArray *existingResults = [context fetchObjectsForEntityName:NSStringFromClass([Serchtrial class]) withSortColumn:nil withSortDescending:FALSE withPredicate:nil];
 NSLog(@"->%@",existingResults);
 Serchtrial *result;
 for(int i=0;i<[existingResults count];i++)
 {
    result=[existingResults objectAtIndex:i];
     [mydata setValue:result forKey:[NSString stringWithFormat:@"checka%d",i]];
 }
 NSLog(@"mydata age%@",[mydata objectForKey:@"checka0"]);

日志返回结果如下

mydata age<Serchtrial: 0x8c80a10> (entity: Serchtrial; id: 0x8c81990 <x- coredata://39E99C99-5639-4C67-86D5-D9B97C79EDF2/Serchtrial/p2> ; data: {
age = "18-25";
gender = Female;
keywords = "AB-ve,o+ve";
"trial_Id" = 0;
"trial_desc" = nil;
})

但我只想要单个字典中的数据

data: {
age = "18-25";
gender = Female;
keywords = "AB-ve,o+ve";
"trial_Id" = 0;
"trial_desc" = nil;
}

我应该在代码中做出哪些更改，请帮助解决此问题。

Answer 1

要使获取请求返回字典而不是管理对象，您必须设置

[request setResultType:NSDictionaryResultType];

代表NSFetchRequest。

通过字典访问值

1 个答案: