![]() ![]() The second-level cache is available through the application’s life cycle, it is only destroyed and recreated when an application is restarted. The first level cache is available only until the session is open, once the session is closed, the first level cache is destroyed. This is disabled by default, but we can enable it through configuration. This cache is enabled by default and there is no way to disable it. ![]() This cache is maintained at the SessionFactory level and shared among all sessions in Hibernate. This is local to the Session object and cannot be shared between multiple sessions. First level and second level cache for which the difference is given below: First Level Cache What is the difference between first level cache and second level cache? Special Features: Hibernate supports OOPs features like inheritance, associations and also supports collections.In the case of JDBC, it throws a checked exception called SQLException thereby mandating the developer to write try-catch blocks to handle this exception at compile time. This along with the built-in transaction management system helps developers to avoid writing multiple try-catch blocks to handle exceptions. Exception Handling: Hibernate wraps the JDBC exceptions and throws unchecked exceptions like JDBCException or HibernateException.Whereas, Hibernate implicity provides this feature. It is upon the developer to write transaction management code using commit and rollback methods. Transaction Management: JDBC doesn't support implicit transaction management.A developer has to know the database-specific codes. This helps in reducing the burden on developers for writing database independent queries. HQL (Hibernate Query Language): Hibernate provides HQL which is closer to Java and is object-oriented in nature.Clean Readable Code: Using hibernate, helps in eliminating a lot of JDBC API-based boiler-plate codes, thereby making the code look cleaner and readable.The advantages of Hibernate over JDBC are listed below: What are the advantages of Hibernate over JDBC? This article would cover basic, intermediate, and advanced questions.Ģ. Top we will walk you through the top questions to get you ready for a Hibernate interview. All these helps developers to save a lot of time involved in development. Along with abstraction, the queries can be executed in a very efficient manner. The developer need not know the underlying complications involved. It does so by mapping the POJO objects with the database tables efficiently and most importantly in an abstract manner. The aim of hibernate framework is to free the developer from the common data persistence-related complex configurations and tasks. Hibernate is a Java-based persistence framework and an object-relational mapping (ORM) framework that basically allows a developer to map POJO - plain old Java objects - to relational database tables. Can you tell something about Named SQL Query Can you tell something about Table Per Class Strategy. What are the concurrency strategies available in hibernate? How to solve N+1 SELECT problem in Hibernate? Can you tell something about the N+1 SELECT problem in Hibernate? What are the states of a persistent entity? What happens when the no-args constructor is absent in the Entity bean? Hibernate Interview Questions For Experienced.Does Hibernate support Native SQL Queries? Can you tell the difference between setMaxResults() and setFetchSize() of Query? ![]() Collection mapping can be done using One-to-One and Many-to-One Associations. When is merge() method of the hibernate session useful? What does session.lock() method in hibernate do? Can you tell something about one to many associations and how can we use them in Hibernate? Differentiate between get() and load() in Hibernate session Differentiate between save() and saveOrUpdate() methods in hibernate session. Can you tell the difference between getCurrentSession and openSession methods? What are the most commonly used annotations available to support hibernate mapping? Is hibernate prone to SQL injection attack? Can you explain the concept behind Hibernate Inheritance Mapping? How do you create an immutable class in hibernate? What can you tell about Hibernate Configuration File? Can you explain what is lazy loading in hibernate? What do you think about the statement - “session being a thread-safe object”? What are some of the important interfaces of Hibernate framework? ![]()
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