you could set some filters and with the frid it should export only the 
records shown, not the whole table....

PS: passing driver_args = {} should do the job with pymysql, but I don't 
see any forums showing that that kind of error is driver-dependant on some 
kind of timeout parameter (as is in sqlite).... seems a mysql configuration 
directive (meaning my.cnf, mysql.ini, etc)...

*wait_timeout = *
*connect_timeout =*
or more probably
*net_read_timeout*

cfr. http://dev.mysql.com/doc/refman/5.0/en/error-lost-connection.html


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