9. Spring ORM Framework

 Spring ORM

    The Spring Framework integrates well with ORM frameworks like Hibernate, Java Persistence API (JPA), Java Data Objects (JDO) and iBATIS SQL Maps. Spring provides resource management, data access object (DAO) implementations, and transaction strategies.

    Spring ORM (Object-Relational Mapping) framework simplifies the integration of Java applications with databases. When combined with Hibernate, it offers a powerful and flexible solution for managing database operations. 



1. Object-Relational Mapping (ORM):
  •    - ORM is a programming technique used to map objects from an object-oriented domain model to a relational database model, and vice versa.
  •    - It abstracts the complexities of SQL queries and database interactions, allowing developers to work with objects directly.
  •    - Instead of writing SQL queries, developers work with domain objects directly, and the ORM framework handles the translation of these objects to and from the database.
  •    -  Hibernate is a widely-used ORM framework for Java applications. It provides an object-oriented approach to database manipulation, allowing developers to work with Plain Old Java Objects (POJOs) instead of dealing directly with SQL queries and JDBC code. 
  •    - Hibernate handles the mapping between Java objects and database tables, as well as the generation of SQL queries.
 

2. Purpose of Spring ORM:
  •    - Spring ORM aims to simplify and streamline database access within Spring applications by providing integration with popular ORM frameworks like Hibernate, JPA (Java Persistence API), and JDO (Java Data Objects).
  •    - It promotes a consistent and flexible approach to database access, facilitating better maintainability and testability of code.

3. Advantages of Using Spring ORM with Hibernate :
  •    - Modularity : Spring allows developers to modularize their applications by separating concerns such as data access, business logic, and presentation layer.
  •    - Ease of Testing : By using dependency injection and interfaces, developers can easily mock DAO classes during unit testing, facilitating test-driven development practices.
  •    - Transaction Management : Spring's declarative transaction management simplifies the handling of database transactions, improving code readability and maintainability.
  •    - Exception Handling : Spring's exception translation mechanisms provide a consistent approach to handling database-related exceptions, making error handling more robust and manageable.



4. Configuration:
  •    - Configuration of Spring ORM typically involves defining data source, transaction manager, and session/entity manager factory beans.
  •    - Developers can configure these components using XML configuration files or Java-based configuration classes annotated with `@Configuration`.
  •    - Spring ORM provides support for various transaction management strategies, including local transactions, JTA (Java Transaction API) transactions, and distributed transactions.


5. Integration of Spring ORM with Hibernate:
   Spring provides excellent support for integrating with Hibernate through its `LocalSessionFactoryBean` and `HibernateTransactionManager` classes. 

Here's how it works:
  
  •    - SessionFactoryBean: Spring's `LocalSessionFactoryBean` is used to configure Hibernate's `SessionFactory`, which represents a single database session. Developers can define properties such as database connection details, entity mappings, and other Hibernate-specific configurations in the Spring application context XML file.
  •    - Transaction Management : Spring's `HibernateTransactionManager` simplifies transaction management in Hibernate-based applications. It allows developers to manage database transactions declaratively using Spring's transaction management features, such as `@Transactional` annotations or XML-based configuration.
  •    - Dependency Injection : Spring promotes the use of dependency injection to manage dependencies between components. Therefore, developers can inject Hibernate `SessionFactories` and `TransactionManagers` into their DAO (Data Access Object) classes, making database access transparent and easier to test.
  •    - Exception Translation : Spring provides exception translation mechanisms that convert Hibernate-specific exceptions into Spring's generic DataAccessException hierarchy. This simplifies error handling and promotes a consistent approach to exception management across the application.





Comments

Post a Comment

Popular posts from this blog

1. Spring Overview

Image
  Spring Framework  - The Spring Framework is a comprehensive framework for enterprise Java development.  - It provides a wide range of features and functionalities that simplify the development of Java applications, particularly in the domain of enterprise and web applications.  - The framework is known for its modularity, scalability, and ease of integration. What is Spring  - It was developed by Rod Johnson in 2003. - Spring is a lightweight framework. - Spring is a Dependency injection framework to make java application loosely couple. - Spring framework makes the easy developement of javaEE (enterprise ) application. Why to Learn Spring? - Spring is the most popular application development framework for enterprise Java. Millions of developers around the world use Spring Framework to create high performing, easily testable, and reusable code. - Spring is a tool that helps make it easier to build software, like apps or websites. -  Learning Spring is val...
Read more

2. Spring Framework Module (Architecture)

Image
  Spring Framework Architecture The Spring Framework is a comprehensive framework for enterprise Java development. It provides a modular and organized way to build enterprise-level applications. The framework is divided into several modules, each addressing specific concerns.  Types  1. The Core Container: 2. Data Access / Integration 3. The Web   4. Miscellaneous (AOP)   1. Spring Core Container:    CORE: This module provides the fundamental parts of the framework,  its including the IoC (Inversion of Control) container and Dependency Injection features.   BEAN : It deals with the creation and management of Java objects (beans) and their dependencies.A sophisticated implementation of factory pattern called BeanFactory, is provided by, Bean module. CONTEXT : This module builds on the core and beans modules, providing a way to access application objects and services in a consistent manner. It has access rights for any objects that de...
Read more

10. Spring - MVC Framework

Image
  Introduction to Spring MVC Framework - Spring MVC is used to develop the web applications that uses MVC design pattern. By using Spring MVC we can build flexible and loosely coupled web applications. - The MVC design pattern helps in seperating the business logic, presentation logic and controller logic. - Models are responsible for encapsulating the application data.  - The Views render response to the user with the help of the model object .  - Controllers are responsible for receiving the request from the user and calling the back-end services. Spring MVC will make application development faster, cost effective and flexible. Advantage of Spring MVC Framework - Clear separation of responsibilities because it implements MVC design pattern. - Loose coupling among Model, View and Controller. - Inbuilt front controller. - Simplified Validation implementation. - Simplified Exception Handling. - Internationalization logic is simplified compared to other frameworks. - Spring...
Read more