Creating Textfiles out of tables II

Hi again,

okay i missed some very important information in my question:
"----begin of my question"
i have some tables and want to extract results of a query on them into a
text-file. it should be possible to insert ":","{" between the different
tuples.
"-----end of my question

What i left is: A trigger should detect an update in these tables and
should create a textfile because of that.

These tables holds data of some Cascading Style Sheets which can be
selected by a user on a webpage. After a update the DATABASE (sorry but
it must be the database) should produce a *.css file (some header, some
footer and the selected fields, seperated by ":" (shortform)) on UPDATE.

MArtin