where is the sqlite's source in android source

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http://stackoverflow.com – all. I'd like to study the sqlite in android. Right now,i have the whole source project of android and aready find the lib folder of sqlite in the /external/sqlite. But,as i know sqlite is runned with its own lib and backhend,pager.Anyway,i can not find out all the source files of sqlite,like pager.c,in the android source project. Any one can give me a hand?thx (HowTos)