![]() In this approach, only the main data is initially fetched, and associated data is fetched from the database on-demand when accessed. Lazy loading, on the other hand, defers the retrieval of related data until the moment it is explicitly requested. ![]() Eager loading can significantly improve performance by reducing the number of database queries but may result in fetching more data than necessary if some of the related data is never actually used. This is beneficial when you know in advance that you will require this associated data to avoid the overhead of multiple additional queries later on. Explain the difference between eager loading and lazy loading.Īns: Eager loading and lazy loading are two distinct strategies used in software development, particularly in the context of database queries or object-relational mapping (ORM) frameworks, to optimize the retrieval of data from a database.Įager loading involves fetching not only the main data you need but also related or associated data upfront in a single query. Hibernate supports associations such as One-to-One, One-to-Many, Many-to-One, and Many-to-Many, which define the relationships between different entities. What are the different types of associations in Hibernate?Īns: The different types of associations in Hibernate are often asked in many Hibernate interview questions. HQL is a Hibernate-specific query language that allows developers to write database-independent queries using Java classes and objects instead of SQL. What is HQL (Hibernate Query Language)?Īns: With this amongst the important Hibernate interview questions, an interviewer may test your understanding of Hibernate. This is another one of the most frequently asked Hibernate interview questions and answers for experienced professionals and freshers alike. ![]() ![]() How does Hibernate handle primary keys?Īns: Hibernate supports various primary key generation strategies, such as identity, sequence, and table, which determine how primary keys are generated for newly inserted records. Detached objects were once persistent but are no longer associated with a session. Persistent objects, on the other hand, are associated with a session and are synchronised with the database. Transient objects are not associated with any session or database. Explain the difference between transient, persistent, and detached objects.Īns: This is one of the most asked Hibernate interview questions and answers you should prepare for. It provides methods to perform CRUD (Create, Read, Update, Delete) operations on persistent objects.Īlso read: Top 7 Java developer Interview Questions and Answers What is the role of Hibernate Session?Īns: A Hibernate Session acts as a communication bridge between the Java application and the database. It is a programming technique that enables the conversion of data between incompatible type systems, like object-oriented programming languages and relational databases.ĥ. ORM stands for Object-Relational Mapping. This is amongst the best Hibernate interview questions and answers that must be included in your preparation list.Īns: One of the very known Hibernate interview questions for freshers is the Object-Relational Mapping topic. How does Hibernate achieve database independence?Īns: Hibernate provides a dialect abstraction layer that translates Hibernate queries into database-specific queries, allowing applications to be more independent of the underlying database system. Hibernate offers advantages like automatic table creation, efficient database access, improved maintainability, reduced boilerplate code, and the ability to work with different database systems without major code changes. Explain the advantages of using Hibernate.Īns: This is another one of the top Hibernate interview questions for freshers. Hibernate is an open-source Java framework that provides an efficient way to map Java classes to database tables, enabling developers to interact with databases using object-oriented paradigms. Ans: This is one of the most important Hibernate interview questions asked by interviewers.
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