I'm not entirely sure what you are asking, but there is a "Form Library" option
in SharePoint which allows you to create and store InfoPath forms using
SharePoint. There are a variety of other methods to connect  to database  content
using SharePoint - one example is using "Data View" web parts - these can be
easily created using FrontPage.

i think i was not clear with my question. i
was asking for options other the options u gave me. kindly give me a
solution.

Options to do what exactly? I'm having trouble figuring out what you want to
do...

the options i mean are those two things... 1) using data  view
webpart. 2)using infopath.
i wanted to know whether i have got any other option to update a
database. using data view webpart we can just view the table. i need
to update the table. if i am using infopath, the table opens the
form in infopath. my requirement is that, i should open the form  in
portal site and make changes to it.

Your only option to do what you are asking is to write (or purchase if one is
available from a 3rd party) a custom web part or web application. There is no
OOTB functionality that does this.

i wanted to know the other options to
connect to database  in sharepoint.