Best Hibernate Interview Questions and Answer Preparation Resources
Hibernate is a very popular ORM (Object Relational Mapping) offering from the Java/J2EE open source community. It's already being used widely in enterprise level applications by many software development companies. Our Hibernate Trainers have many years of real time industry experience aE" hence they are very much aware of the industry needs & will train you so that you fit exactly to real time industry requirements. Hibernate not only takes care of the mapping from Java classes to database tables but also provides data query and recovery facilities. Hibernate framework simplifies the development of java application to interrelate with the database. Hibernate is an open source, lightweight, ORM tool. Hibernate has its own internal connection pooling but it also support some third party connection pooling for manufacture use.
N+1 problem is a performance issue in Object Relational Mapping that fires multiple select queries (N+1 to be exact, where N= number of records in a table) in the database for a single select query at the application layer. Hibernate provides multiple ways to catch and prevent this problem.
Frequently Asked Questions on Hibernate Interview Questions
Hibernate is an open source freely available ORM (Object Relational Mapping) framework. Hibernate also provides data query and retrieval facilities on database. It also has its own standard query language known as Hibernate Query Language or HQL. One of the biggest disadvantage and nightmare for complex application of JDBC was that application data has to converted into SQL syntax. Hibernate ORM is concerned with to facilitate and helping your application to achieve persistence. Hibernate is a Java framework that simplifies the development of Java application to interact with the database.Hibernate also provides modules like Hibernate Core, JPA with Hibernate. There are a lot of multiple interfaces provided by Hibernate in core.
One of this object states is transient. In hibernate which is object relation mapping it will map or create every variable with the class we have defined. For an example if we declare or add a new variable it will add its entry to the database. But if a variable is marked @Transient then it will not be added in the database. This means that it has no persistence representation in that particular hibernate session. And after the application is closed these transient objects will automatically be destroyed through garbage collection.
The JPA in Hibernate is the module of Spring Data contains a custom namespace that allows defining repository beans. It is also contains certain features and constituent attributes that are special to JPA. JPA is not an implementation it is only a specification. In one line if we want to define the Hibernate and JPA then we can say that Hibernate is the implementation of all the JPA guidelines.