核心数据：打印实体的内容 [英] Core-Data: Print contents of an entity

问题描述

如何打印实体的内容，例如

我希望数据具有表格形式，例如，实体数据应该打印如下：

名字|姓氏电话号码|电子邮件| DOB

我还需要在打印数据之前应用搜索谓词。

谢谢！

>

解决方案

我发现这个链接帮助我使用核心数据：
http://iphoneinaction.manning.com/iphone_in_action/2009/09/core-data- part-3-retrieval-data.html

将实体投射到数组，循环数组，NSLog为每个结果的数据。例如：

  NSEntityDescription * entity = [NSEntityDescription entityForName：@news
 inManagedObjectContext：self.managedObjectContext]; 
 [fetchRequest setEntity：entity]; 
 NSPredicate * predicate = [NSPredicate predicateWithFormat：@url =％@，theUrl]; 
 [fetchRequest setPredicate：predicate]; 
 
 NSError * error; 
 NSArray * items = [self.managedObjectContext 
 executeFetchRequest：fetchRequest error：& error]; 
 
 for（news * theNews in items）{
 NSLog（@Title：％@，Date：％@，News：％@，[theNews title]，[the News date] ，[新闻新闻]）; 
} 
 
 [fetchRequest release]; 
  

How would I print the contents of an entity e.g. customer?

I want the data to be table like, e.g. the entity data should print like so:

First Name | Last Name | Telephone Number | Email | DOB

I also need to apply a search predicate before printing the data, e.g. print members born after 1984

Could anybody tell me how I should do this?

Thanks!

解决方案

I found this link which helped me alot using core data: http://iphoneinaction.manning.com/iphone_in_action/2009/09/core-data-part-3-retrieving-data.html

Cast the entity to an array, loop the array and NSLog the data for each result. E.g.:

NSEntityDescription *entity = [NSEntityDescription entityForName:@"news" 
                                          inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"url=%@",theUrl];
[fetchRequest setPredicate:predicate];

NSError *error;
NSArray *items = [self.managedObjectContext
                   executeFetchRequest:fetchRequest error:&error];

for (news *theNews in items) {
    NSLog(@"Title: %@, Date: %@, News: %@", [theNews title], [theNews date], [theNews news]);
}

[fetchRequest release];

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