What is HQL?

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Hibernate Query Language (HQL) is an object-oriented query language provided by Hibernate. It is similar to SQL but operates on persistent objects (entities) instead of directly working with database tables and columns. HQL is database-independent, meaning the same query can run across different databases without modification, as Hibernate translates HQL into the corresponding SQL for the underlying database.

Key features of HQL:

• Entity-Oriented: HQL queries are written using class names and their properties, not table names or columns. Example: FROM Employee e WHERE e.department = 'IT'.

• Database Independence: Since it is based on Hibernate entities, queries are portable across databases.

• Powerful Syntax: Supports SELECT, UPDATE, DELETE, JOIN, GROUP BY, ORDER BY, subqueries, and aggregate functions.

• Polymorphism: HQL supports inheritance, allowing queries on parent classes to also fetch subclass objects.

• Named Queries: HQL can be stored as named queries for reuse.

In summary, HQL is a flexible, object-oriented query language in Hibernate that helps developers interact with data using entity objects rather than raw SQL tables, ensuring abstraction, reusability, and database independence.

Read more  :

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Explain caching levels in Hibernate.

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