file uploading in cake php

In my add view i have one form which contain file upload option i want
to send all the values of form in one table but file upload option is
displaying error like array to string conversion because the query is
like that ("insert into enteries(section,list,submenu,file) values
('shopping','list','sub',array)") why file field is having array as a
value how to do file uploading from a form in cakephp
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