Core data updating entities
Optimizing Your Predicate - No query optimizer in SQLite - Eliminate largest groups first - Put heaviest operations last Example: A) search String CONTAINS "red" OR timestamp BETWEEN (X, Y) B) timestamp BETWEEN (X, Y) OR search String CONTAINS "red" Option B is faster. This will immediately eliminate some of the string comparisons that will need to take place. So if you need them right away, do this so you don't end up making multiple IO requests shortly thereafter.
Below is a list of predicate comparisons in order of increasing cost: - Beginswith, Endswith - Equality (==) - Contains - Matches This will prefetch these relationships.
Core Data is the technology that allows you to store and retrieve information on an i OS device.
Although it is an advanced technology often difficult to grasp, my goal in this post is to simplify Core Data so it can be easily used by beginners.
Do you have an idea for an app but lack the programming knowledge to begin building it?
Fetch them into memory using a single fetch request and then loop through them.
Let's say you have a list of user IDs for users that you need to delete.
Also I used the if #available(i OS 9.0, *) so that i OS 9 devices can take advantage of the speedy code for it.
Then run my tweaked code base your suggestions to support older i OS. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
If this it is not the case you can find very good tutorials on the Tim Roadely’s blog or on the Ray Wenderlich’s blog.