Reading documents(excel) from Database

[Halász Bálint]

Hi,
 
I am newbie in POI.
My primary question is :
- Is it possible to load document(excel) from database? And if yes how?
 
I am asking this because from the doc and API it is not quite clear the
 
<http://jakarta.apache.org/poi/apidocs/org/apache/poi/poifs/filesystem/POIFSFileSystem.html#POIFSFileSystem(java.io.InputStream)>
 POIFSFileSystem(java.io.InputStream stream) 
can handle inputreams coming from source other than filesystem.
 
Thanx for the help in advance,
Balint