Hi Mohamad,
Laserfiche does not store the documents as Blobs in the DB, it stores them in the windows file structure (Laserfiche Volumes) and references these through a path in the DB in the DBO.TOC table.
You can write an integration using the Laserfiche SDK for an import programme, or you can use Laserfiche Import Agent, Laserfiche Quick Fields or even the good old drag and drop into Laserfiche to do bulk importing of documents. It all depends on the exact scenario and what you are trying to achieve which will dictate what option you need to use. Your Laserfiche VAR should be able to offer more information around this and help with planning etc.
Hope this helps!