在objective-C中同步sqlite数据库

I have a view in which I am inserting data in a background thread to sqlite database coming from server. Now when user taps and navigate to another view in which I have to read the contents from this database, but I am not able to fetch the contents as the database is already open in background thread of last view and it gives error "database is locked".I have a view in which I am inserting data in a