问题
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.
回答1:
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
来源：https://stackoverflow.com/questions/11305590/how-to-get-unique-values-retrieve-from-coredata-iphone-app