How is a file attachment stored in database?

Hi all~~
I am developping an email application(web based) using Javamail. I need to store the attachment together with the relevant email messages in the database. Is that correct that I add an attribute called ATTACHMENT in the entity which stores the file attachment uploaded by users? If so, is the datatype of ATTACHMENT called OBJECT?
This question confused me for more than a week already. I can send an email with the attachment which I wrote the path of the file in code, but I can't store it in the database.
Your advice is appreciated!! Thank you!

Hi,
Oracle stores the BOM in basically 2 tables BOM_BILL_OF_MATERIALS and BOM_INVENTORY_COMPONENTS.
The simplest way to explode the BOM in Oracle is to use the BOMPEXPL (BOM Exploder) package.
Hope this helps.
Sameer

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Regards,
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