sync between ipad db and remote db

Ok,i am a newbie to iOS dev and i have a difficult task at hand. I have an ipad app that has a database. i created a web-service on my mac mini using php,apache,mysql. What i would like to do is sync the database on the ipad with the one i have on the remote computer maybe once everyday. Can someone please provide me with an example,sample code or even advice on how to go about doing this? Thanks in advance.