You can use Web2py DAL to open the mySQL database. No need for separate 
library. See the Web2py book on DAL constructor. Make a (second) db connection, 
say db2, and retrieve the rows from db2 using select().

For the rest you're well on your way. Just need to update the standard db for 
each found row. See 
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#count--isempty--delete--update
 
Something like:

For row in rows:
    db(db.name==row.name)update(fieId=row.field, ...)

Nico de Groot

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- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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