Get Interview Ready with SpringData JPA & Hibernate Concepts | Free  Web Development Hibernate course

Learn all the concepts of Hibernate and Spring Data JPA to get ready for Interview

Get Interview Ready with SpringData JPA & Hibernate Concepts | Free  Web Development Hibernate course

In this course, you will learn all the concepts of Hibernate and Spring Data JPA to prepare for the interview. You will study the following: Hibernate ORM Framework - JPA Implementation Hibernate has a layered architecture that helps users operate without having to know the underlying API. Hibernate provides persistence services (and persistent objects) for applications that use database and configuration data. Hibernate Application architecture and its important base classes. Config Object Config Object is the first Hibernate object you create in any Hibernate application. It is usually created only once during application initialization. The configuration object has two main components: database connection configuration class map configuration SessionFactory object The configuration object is used to create SessionFactory objects. SessionFactory is a thread-safe object used by all application threads. We need to use a separate configuration to use the SessionFactory object for each database. Session Object Session is used to obtain a physical connection to a database. Session objects are lightweight and designed to be instantiated when database interaction is required. Static objects are stored and retrieved using session objects. Transaction Object A transaction represents a database business unit, and most RDBMSs support the transaction function. Transactions in Hibernate are managed by the transaction manager and underlying transactions (from JDBC or JTA-Java Transaction API). Query Object The Query Object uses SQL or Hibernate Query Language (HQL) strings to retrieve data from the database and create objects. The query instance is used to bind the query parameters, limit the number of results returned by the query, and finally execute the query. Criteria object (Filter selection query with many position conditions) The Criteria object is used to create and execute object-oriented criteria queries to retrieve elements. STATES OF HIBERNATE Object No new instance of a session-independent static class Has no representation in the database and has no identity value considered transient by Hibernate: // person in transient state The persistent instance has a database representation, an identifier value, and is associated with the session. You can make the temporary instance persistent by attaching it to the session: If we close the hibernate session now, the persistent instance becomes a separate instance: it is no longer associated with the session (but can still be modified and attached to a new instance). subsequent session)). HIBERNATE CACHING Caching is a mechanism to improve system performance. It is a buffer between the application and the database. The cache stores recently used data items to reduce the number of times the database is accessed. Cache is also important for hibernation. It uses a multi-level cache scheme as shown below: Level 1 cache Level 1 cache is a session cache, a mandatory cache through which all requests must pass . The session object holds the object under its own authority before moving it to the database. L2 Cache The L2 cache is an optional cache that always references the L1 cache before attempting to locate an item in the L2 cache. The second level cache can be configured on a per-class and per-collection basis and mainly responsible for caching objects across sessions. Query-level Cache Hibernate also implements a cache for query resultsets that integrates closely with the second-level cache. This is an optional feature and requires two additional physical cache regions that hold the cached query results and the timestamps when a table was last updated. This is only useful for queries that are run frequently with the same parameters. JPA offers different ways to generate primary key values: @Id AUTO: Hibernate selects the generation strategy based on the used dialect, IDENTITY: Hibernate relies on an auto-incremented database column to generate the primary key, SEQUENCE: Hibernate requests the primary key value from a database sequence, TABLE: Hibernate uses a database table to simulate a sequence. SPRING DATA JPA - Hibernate-based abstraction layer Spring Data JPA, part of the large Spring Data suite for easy implementation of JPA-based repositories. This module is about improving support for JPA-based data access layers. It makes it easy to build Spring-based applications that use data access technologies. Implementing the data access layer in the application has been difficult for some time. A lot of code has to be written to perform simple queries and do paging and auditing. Spring Data JPA aims to greatly improve data access layer applications by reducing the amount of work that is actually required. As a developer, you write the repository interface, including custom lookup methods, and Spring takes care of the implementation automatically. Who this course is for: Anyone who wants to brush up on hibernate and leverage JPA data concepts and prepare for interviews

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