How to determine the MIME types of the files?

I'm making an application, in which I've to upload the files to the database. Now I want to insert into the database the MIME type of the files. Now how can I know that which type of the file is having which MIME type?
where can I get the list of all supported MIME types?
Even if I get the list, then every time I update the file in the database, so every time I have to check the file extension and then insert the MIME type...
this seems to be a tedioius job..
Is there any simple way to do this?

I could ask "supported by what?" but I assume you will
be the one supporting them. Here's a link to the
latest list of registered MIME types.HERE's the link...
ftp://ftp.isi.edu/in-notes/iana/assignments/media-types/media-types

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http://help.sap.com/saphelp_nw04/helpdata/en/ad/ebe5cc1d75aa43a2871717d76f475d/content.htm
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hi
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Hello,
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<jsp:directive.page import="lehman.ra.RAUtilBean" />
<jsp:directive.page import="java.util.ArrayList" />
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<jsp:directive.page import="lehman.helper.irprod.IRProdHelper"/>
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How to determine the MIME types of the files?

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