Hi,

Hibernate Query By Criteria (QBC) API is used to create queries by manipulation of criteria objects at run-time. This approach lets you specify constraints dynamically without direct using manipulations, but it doesn't lose much of the flexibility or power of HQL.

For getting clear concept about Hibernate QBC API visit below link:

http://www.roseindia.net/hibernate/examples/criteria/hibernatecriteriaapi.html

Thanks,