[plt-scheme] Need some advices for Database

hi all,

I'm I am beginning in scheme language, I try to create a small program, it's
a agenda / contact, I want to save & load my data  when I execute my prog.

I need two advices :

1) what is the best way to make a simple database with scheme?
 I start to make class% and define link into different class.

2) But the real problem is how to load & save data (in xls for example) ,
what is the best simple method ?

Maybe this way "(open-output-file filename)" ?

thanks
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