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http://www.sqlite.com.cn/MySqlite/11/395.Html
http://blog.163.com/db_lobster/blog/static/9639092200922511442177/
http://blog.163.com/sea_haitao/blog/static/775621620096412211732/
http://hi.baidu.com/tigerjgh/blog/item/e2b795188f7aebb14aedbcd0.html