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I was following the developer when he was testing iKeyEx and we had to hack around to get 5-row back then, but you shouldn't have to work that hard now. I think it's on Cydia now, or grab the deb, ssh it to the phone, log in as root and run:
dpkg -i hk.kennytm.iKeyEx3-0.1-99j.deb
 
Oh wait, you said "db files". I guess you meant "deb files." Ok, copy them to the phone, then the rest depends on what ssh client you use or if you have MobileTerminal installed. If you're using a command line client or MobileTerminal, type the following commands

cd [wherever you put the deb files, e.g. /var/mobile]
su [use alpine as the password unless you've changed it]
dpkg -i hk.kennytm.iKeyEx3-0.1-99j.deb
dpkg -i hk.kennytm.5RowQWERTY-0.1-99h.deb

If you're using something else, sorry, I can't help but someone else surely will.
 
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