如何获取唯一值从Coredata iphone应用程序检索？ [英] How to get unique values retrieve from Coredata iphone app?

问题描述

在Coredata存储中不太熟悉。我要为单个人保存多个数据，并检索所选人员的数据。很聪明的我在coredata表的商店价值如下，

  ID名称日期报告状态
 1 Gopi 31六月01.90 pm ABCD Y 
 2机器人27六月2 am hdfsdfk N 
 1 Gopi 31六月02.00pm fsdjk N 
 2机器人29 6月3日eyrwruo Y 
 1 Gopi 1 7月3日下午rweyskd Y 
 1 Gopi 2 7月2pm ABCD N 
 2机器人1 7月2日下午4时eirwierundfs Y 
 3约翰2月7日10am fewyrhhskd Y 
 3约翰·3月11日sdkfksjfnvmnfks N 
  
 
 
 
在我的第一个视图控制器中，我想在tableview中显示这样的细节，
  Gopi 2 July 2pm> 
 ABCD Y 
 Robot 1 July 2.40pm> 
 eirwierundfs Y 
 John 3 July 11am> 
 sdkfksjfnvmnfks Y 
  
 当用户选择Gopi时，到具有表视图的另一个视图控制器，并且他们可以查看命名为Gopi 的所有记录。而且我想从entitiy删除所选的用户详细信息。任何人都可以帮助我从Coredata获取唯一的用户详细信息？
 
 
 
我已经将值存储在coredata实体中，并从实体检索所有行。但是，现在很难从实体获取所选人员数据的唯一值。你可以帮我吗？提前感谢。
解决方案
从核心数据获取记录时，添加这两行
  NSPredicate * predicate = [NSPredicate predicateWithFormat：@Name ==％@，str]; 
 //给你的属性名称而不是name
 //在str中给出名称gopi（你的case）或任何你想要的
 
 [fetchRequest setPredicate：谓词]; 
 //将谓词设置为您的提取请求
  
然后执行fetch请求
 
Am not well familiar in Coredata storage. I want to save multiple data for a single person and retrieve the data of a selected person. Like wise i have store values in coredata table like below,
ID     Name    Date                 Report                  Status
1      Gopi    31 June 01.90pm      ABCD                    Y
2      Robot   27 June 2 am         hdfsdfk                 N
1      Gopi    31 June 02.00pm      fsdjk                   N
2      Robot   29 June 3am          eyrwruo                 Y
1      Gopi    1 July 3pm           rweyskd                 Y
1      Gopi    2 July 2pm           ABCD                    N
2      Robot   1 July 2.40pm        eirwierundfs            Y
3      John    2 July 10am          fewyrhhskd              Y
3      John    3 July 11am          sdkfksjfnvmnfks         N
In my first view controller i want to show the details like this in tableview,
Gopi            2 July 2pm     >
ABCD            Y 
Robot           1 July 2.40pm  >
eirwierundfs    Y
John            3 July 11am    >
sdkfksjfnvmnfks Y
When the user selects Gopi, It will navigate to another view controller with table view and they can view all records of named Gopi. And also i want to delete the selected user details from the entitiy. Can anyone please help me to get a unique user details from Coredata?

I have stored the values in coredata entity and retrieved all the rows from the entity. But, now am struggling to get a unique values of selected person data from the entity. Could you please help me? Thanks in advance.
解决方案
While fetching  record from core data add these two lines
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"Name==%@",str];
 //  Give your attribute name instead of "name"
 //  In str give the name "gopi" (for your case)  or whatever you want    

[fetchRequest setPredicate:predicate];
//set predicate to your fetch request
Then execute fetch request

                        
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