how to download the iphone app update to replace the old sqlite database

i use sqlite database on my iphone app and

i need to update this database from the internet from my server

how i can download the new database and delete the old database

and recopy the new database to document directory

Download your file with +[NSData dataWithContentsOfURL:].
Close sqlite DB, if opened.
Remove old DB file (may be just rename - if something went wrong with downloaded data, you may revert to prev. version of a DB faile) with -[NSFileManeger removeItemAtPath:error:]
Write downloaded data to a DB file with -[NSData writeToFile:atomically:].

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