[Android] ios similar QQ chat program saves recent contacts

At a recent chat program within the company . Now want to save the recent contacts . I do not know how to save data locally. What did a similar great God, is to use the database yet. . . Or other methods to document alive . ! ! ! ! ! ! Neighborhoods
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select * from messageTable order by messageTime group by messageFrom Specific effects can
venue my imitation micro-channel xmpp chat demo:
http://code4app.com/ios/5206fc076803faed58000000
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are recommended to use sqlite, too much trouble, the list of attributes can also be
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sqlite I would use , but there is a problem . Is what I receive messages when sending messages alive add a user object to the database. Thus, the stop of the transceiver , recent contacts not to repeat it ? I want to keep only one , next time you encounter is not saved . The database is not particularly familiar with , ask
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