What is lazy loading in hibernate interview questions?

What is lazy loading in hibernate interview questions?

Lazy loading in hibernate improves the performance. It loads the child objects on demand. Since Hibernate 3, lazy loading is enabled by default, and you don’t need to do lazy=”true”. It means not to load the child objects when the parent is loaded.

What are the hibernate interview questions?

Hibernate Interview Questions For Freshers

  • What is ORM in Hibernate?
  • What are the advantages of Hibernate over JDBC?
  • What are some of the important interfaces of Hibernate framework?
  • What is a Session in Hibernate?
  • What is a SessionFactory?
  • What do you think about the statement – “session being a thread-safe object”?

What are the task can be handled by current packages of hibernate?

It is a powerful, high performance Object-Relational Persistence and Query service for any Java Application. Hibernate maps Java classes to database tables and from Java data types to SQL data types and relieve the developer from 95% of common data persistence related programming tasks.

What is the lazy loading in Hibernate?

Hibernate now can “lazy-load” the children, which means that it does not actually load all the children when loading the parent. Instead, it loads them when requested to do so. You can either request this explicitly or, and this is far more common, hibernate will load them automatically when you try to access a child.

What is the difference between lazy and eager loading in Hibernate?

Eager Loading is a design pattern in which data initialization occurs on the spot. Lazy Loading is a design pattern that we use to defer initialization of an object as long as it’s possible.

What are the annotations used in Hibernate?

Hibernate JPA Annotations – Contents:

Annotation Package Detail/Import statement
@Entity import javax.persistence.Entity;
@Table import javax.persistence.Table;
@Column import javax.persistence.Column;
@Id import javax.persistence.Id;

What is proxy object in Hibernate?

A proxy is a subclass implemented at runtime. Hibernate creates a proxy (a subclass of the class being fetched) instead of querying the database directly, and this proxy will load the “real” object from the database whenever one of its methods is called.

How does Hibernate work internally?

Hibernate takes care of mapping Java classes to database tables using XML files and without writing any line of code. Provides simple APIs for storing and retrieving Java objects directly to and from the database. If there is change in the database or in any table, then you need to change the XML file properties only.

What is lazy and eager in Hibernate?

Eager and Lazy Loading The first thing that we should discuss here is what lazy loading and eager loading are: Eager Loading is a design pattern in which data initialization occurs on the spot. Lazy Loading is a design pattern that we use to defer initialization of an object as long as it’s possible.

How Hibernate use lazy initialization?

To enable lazy loading explicitly you must use “fetch = FetchType. LAZY” on a association which you want to lazy load when you are using hibernate annotations. private Set products; Another attribute parallel to “FetchType.

What is lazy loading in hibernate?

Lazy loading in hibernate improves the performance. It loads the child objects on demand. Since Hibernate 3, lazy loading is enabled by default, and you don’t need to do lazy=”true”. It means not to load the child objects when the parent is loaded.

Why do we ask hibernate interview questions?

Hibernate interview questions are asked to the students because it is a widely used ORM tool. The important list of top 20 hibernate interview questions and answers for freshers and professionals are given below.

What are the annotations in JPA and hibernate?

The most important annotations are JPA and Hibernate: javax.persistence.Entity : used to specify a class as an entity bean. javax.persistence.Table : used to determine the name of the table from the database that will be displayed on the entity bean. javax.persistence.Access : defines the access type, field, or property.

What is Hibernate and how does it work?

Hibernate supports lazy initialization using proxy objects and performs database queries only when necessary. Hibernate supports different levels of cache, and therefore can improve performance.