What is the latest version of Hibernate?
Hibernate (framework)
| Developer(s) | Red Hat |
|---|---|
| Stable release | 6.1.Final / June 14, 2022 |
| Preview release | 6.0.0.Beta1 / October 11, 2021 |
| Repository | github.com/hibernate/hibernate-orm |
| Written in | Java |
What are the Hibernate interview questions?
Hibernate Interview Questions
- 1) What is hibernate?
- 2) What is ORM?
- 3) Explain hibernate architecture?
- 5) Mention some of the advantages of using ORM over JDBC.
- 6) Define criteria in terms of Hibernate.
- 7) List some of the databases supported by Hibernate.
- 8) List the key components of Hibernate.
Is session thread safe in Hibernate?
Yes. It offers thread safety as it’ll ensure that it’ll create a session for each thread if session not exist.
What is SessionFactory and session in Hibernate?
SessionFactory is a factory class for Session objects. It is available for the whole application while a Session is only available for particular transaction. Session is short-lived while SessionFactory objects are long-lived. SessionFactory provides a second level cache and Session provides a first level cache.
How many layers are available in Hibernate architecture?
four layers
The Hibernate architecture is categorized in four layers. This is the high level architecture of Hibernate with mapping file and configuration file. Hibernate framework uses many objects such as session factory, session, transaction etc.
What is dirty checking in Hibernate?
Hibernate monitors all persistent objects. At the end of a unit of work, it knows which objects have been modified. Then it calls update statement on all updated objects. This process of monitoring and updating only objects that have been changed is called automatic dirty checking in hibernate.
What is pojo in Hibernate?
POJO classes are used in hibernate for mapping to database objects. That means all object entities we make in POJO classes will be reflected in a database object. It should not extend classes, implement interfaces, or contain prespecified annotations.
Does Hibernate use JDBC?
JDBC is the standard API that Java applications use to interact with a database. JTA is the standard API for managing transactions across one or more resources. The closest answer to your question would be that “internally”, Hibernate uses JDBC to interact with the database.
Why SessionFactory is used in Hibernate?
Most importantly, the SessionFactory in Hibernate is responsible for the creation of Session objects. The Hibernate Session provides methods such as save, delete and update, all of which are used to perform CRUD-based operations on the database to which the SessionFactory connects.
What is proxy object in Hibernate?
Hibernate uses a proxy object to implement lazy loading. When we request to load the Object from the database, and the fetched Object has a reference to another concrete object, Hibernate returns a proxy instead of the concrete associated object.
What is difference between evict and clear in Hibernate?
evict() evicts a single object from the session. clear() evicts all the objects in the session. Calling clear() is like calling evict() on every object associated with the session.
Why Hibernate is called ORM?
Hibernate ORM enables developers to more easily write applications whose data outlives the application process. As an Object/Relational Mapping (ORM) framework, Hibernate is concerned with data persistence as it applies to relational databases (via JDBC).
What is difference between load and get method in Hibernate?
In hibernate, get() and load() are two methods which is used to fetch data for the given identifier. They both belong to Hibernate session class. Get() method return null, If no row is available in the session cache or the database for the given identifier whereas load() method throws object not found exception.
What is the difference between save and persist in Hibernate?
Difference between saving and persist method in Hibernate 1)The first difference between save and persist is there return type. Similar to save method, persist also INSERT records into the database, but return type of persist is void while return type of save is Serializable Object.
What is dirty check in hibernate?
Hibernate provides as feature called Automatic Dirty checking whereby changes to a persistent object are automatically saved to the database when the session is flushed or the transaction is committed. So the code does not need to invoke an explicit save or update.
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