how do i achieve the lock in accessing a single record from the Database?

I retrieved a record using IE, then retrieved the same record using Netscape. I locked the record in IE so why is it possible to access it in Netscape?

i used this line:
getHibernateTemplate().get(<class>,<primary key>,LockMode.UPGRADE_NOWAIT)

i tried to get the lock of the record using an external SQL program, andwhen i tried to access it thru IE/Netscape, the exception happened (locked record).

any suggestions?