autoupgrade.txt

非常棒的java数据库

file conversion should be done automatically when the new engine connects.  

auto-upgrade application:
check if new version is available 
(option: digital signature)
if yes download new version
(option: http, https, ftp)
backup database to SQL script
(option: list of databases, use recovery mechanism)
install new version

ftp client
task to download new version from another HTTP / HTTPS / FTP server
multi-task