CoreData Persistence data store attention points

Source: Internet
Author: User


CoreData is an important means to implement data persistence storage after iOS3.0. Here are some points to note:

    1. appdelegate

    2. coredata entity creation can not be used alloc, but need to use nsentitydescription

    3. coredata needs to be synchronized after each operation, that is, save

    4. add

      nsentitydescription: Method:

+ (ID) insertnewobjectforentityforname: (NSString *) entityname inmanagedobjectcontext: (Nsmanagedobjectcontext *) Context

5. Check

Nsfetchrequest Data Query Request class

Nspredicate set query criteria through predicates, not set to get all data

6. Delete, change

Build on the basis of the check, through the query to get the array, delete it or change the operation ...


CoreData Persistence data store attention points

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.