Counting instances in Core Data
Counting instances in Core Data
- Subject: Counting instances in Core Data
- From: Steve Cronin <email@hidden>
- Date: Tue, 29 Apr 2008 11:03:11 -0500
Folks;
I want to obtain a count of instances for a specific entity in stored
in Core Data (SQLite)
In the archive I find this:
________________
FROM : mmalcolm crawford
DATE : Sun Apr 02 21:21:45 2006
On Apr 2, 2006, at 11:16 AM, Frederick C. Lee wrote:
> How do you count (or determine empty) data from a persistent store
(table)?
Execute a fetch for the entity in which you're interested, and count
the returned array.
________________
My question is: what is the most efficient fetch to pose given that
every fetch is IO.
A given entity might have a lot of records so an array COULD be an
unnecessarily large transaction...
Is there a best practice fetch for this 'get a count' purpose?
Steve
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