It will automatically load all hbm mapping files Load the Hibernate configuration file and create configuration object.The general flow of Hibernate communication with RDBMS is :
SessionFactory sessionFactory = configuration.buildSessionFactory() ġ3.What is the general flow of Hibernate communication with RDBMS? It also holds cached data that has been read in one unit of work and may be reused in a future unit of work The SessionFactory caches generate SQL statements and other mapping metadata that Hibernate uses at runtime. There is typically a single SessionFactory for the whole application-created during application initialization. The application obtains Session instances from a SessionFactory. Holds a mandatory (first-level) cache of persistent objects, used when navigating the object graph or looking up objects by identifierġ2.What role does the SessionFactory interface play in Hibernate?.Session session = sessionFactory.openSession() It allows you to create query objects to retrieve persistent objects. It is a single-threaded, short-lived object representing a conversation between the application and the persistent store. The Session interface is the primary interface used by Hibernate applications. Using these interfaces, you can store and retrieve persistent objects and control transactions.ġ1.What role does the Session interface play in Hibernate? The five core interfaces are used in just about every Hibernate application. The most common methods of Hibernate configuration are:ĩ.What are the important tags of ?įollowing are the important tags of :ġ0.What are the Core interfaces are of Hibernate framework? Typical mapping file look as follows:Ĩ.What are the most common methods of Hibernate configuration? Hibernate mapping file tells Hibernate which tables and columns to use to load and store objects. Complex joins for retrieving related itemsħ.What is the need for Hibernate xml mapping file?.Centralizing pre save and post retrieve logic.Making database column and table name changes.Saving and retrieving your domain objects.ORM framework generates database-specific SQL for you.
Apart from this, ORM provides following benefits: The main advantage of ORM like hibernate is that it shields developers from messy SQL. Hibernate is a pure Java object-relational mapping (ORM) and persistence framework that allows you to map plain old Java objects to relational database tables using (XML) configuration files.Its purpose is to relieve the developer from a significant amount of relational data persistence-related programming tasks.ĥ.Why do you need ORM tools like hibernate?
Stackoverflow hibernate interview questions full#
Full object Mapping (composition,inheritance, polymorphism, persistence by reachability).Optimization facilities : dirty checking,lazy associations fetching.API to express queries refering to classes.API for performing basic CRUD operations.ORM is the automated persistence of objects in a Java application to the tables in a relational database.Īn ORM solution consists of the followig four pieces: ORM stands for object/relational mapping.
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