Hibernate provides a SQL-inspired language
called Hibernate Query Language (HQL) that allows you to write SQL-like queries
against Hibernate data objects. Criteria Queries are provided as an
object-oriented alternative to HQL. Criteria The query is used to modify objects
and provide restriction for objects. HQL (Hibernate Query Language) is the
object-oriented version of SQL.
It generates queries that are independent of
the database, so that it is not necessary to write database-specific queries.
Without this functionality, modifying the database would require modification
of individual SQL queries, resulting in maintenance problems
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