plugin for custom database?

ok – i have a client who wants/needs to offer a searchable database of their survey data via a protected area of his website…

i’d LIKE to be able to do it within wordpress, but am not even really sure what to look/ask for in a plugin.

i’m hoping for a little guidance & insight – maybe i can’t do this with wordpress… or maybe someone knows a trick.

data is currently in csv format, CAN be exported from survey software in xml as well…

will need to be updated periodically as new data is collected

any input or ideas would be much appreciated.