Hibernate introduction
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The document discusses JPA/Hibernate, object-relational mapping, and web services. It defines Hibernate as an open source ORM for Java that makes data persistent by storing it in a database. It notes that Hibernate automatically generates SQL queries and reduces development time compared to manually handling data with JDBC. The architecture of Hibernate and web services is described, including how Hibernate sits between code and the database to map objects to tables. Common web service types like SOAP and REST are also summarized.
Hibernate introduction
- 1. JPA / HIBERNATE Sagar Verma Sr.Software Engineer Ad. JAVA
- 2. Object-Relational Mapping • It is a programming technique for converting object-type data of an object oriented programming language into database tables. • Hibernate is used convert object data in JAVA to relational database tables.
- 3. What is Hibernate? • It is open source object-relational mapping (ORM) for Java. • Hibernate is responsible for making data persistent by storing it in a database.
- 4. Why Hibernate and not JDBC? • JDBC maps Java classes to database tables (and from Java data types to SQL data types) • Hibernate automatically generates the SQL queries. • Hibernate provides data query and retrieval facilities and can significantly reduce development time as more time is required to manually handle data in SQL and JDBC. • It makes an application portable to all SQL databases.
- 5. Architecture Hibernate sits between your code and the database Maps persistent objects to tables in the database
- 6. Hibernate • Configuration Object: – The Configuration object is the first Hibernate object you create in any Hibernate application and usually created only once during application initialization. The Configuration object provides two keys components: – Database Connection: This is handled through one or more configuration files supported by Hibernate. These files are hibernate.properties and hibernate.cfg.xml. – Class Mapping Setup This component creates the connection between the Java classes and database tables. • SessionFactory Object: – Configuration object is used to create a SessionFactory object which inturn configures Hibernate for the application using the supplied configuration file and allows for a Session object to be instantiated. – SessionFactory is a thread safe object and used by all the threads of an application. – The SessionFactory is heavyweight object so usually it is created during application start up and kept for later use. – You would need one SessionFactory object per database using a separate configuration file. So if you are using multiple databases then you would have to create multiple SessionFactory objects.
- 7. Hibernate • Session Object: – A Session is used to get a physical connection with a database. – It is lightweight and designed to be instantiated each time an interaction is needed with the database. Persistent objects are saved and retrieved through a Session object. – The session objects should not be kept open for a long time because they are not usually thread safe and they should be created and destroyed as needed. • Transaction Object: – A Transaction represents a unit of work with the database and most of the RDBMS supports transaction functionality. Transactions in Hibernate are handled by an underlying transaction manager and transaction (from JDBC or JTA). – This is an optional object and Hibernate applications may choose not to use this interface, instead managing transactions in their own application code. • Query Object: – Query objects use SQL or Hibernate Query Language (HQL) string to retrieve data from the database and create objects. A Query instance is used to bind query parameters and to execute the query.
- 8. WEB SERVICE
- 9. History of Web Service • Structured programming • Object-oriented programming • Distributed computing • Electronic data interchange • World Wide Web • Web services
- 10. What is Web Service? • Web service is a standardized medium to propagate communication between the client and server applications on the World Wide Web. • Web services provide a common platform that allows multiple applications built on various programming languages to have the ability to communicate with each other
- 11. Architecture of Web Service
- 12. Type of Web Service? • SOAP: SOAP is known as the Simple Object Access Protocol. SOAP was developed as an intermediate language so that applications built on various programming languages could talk quickly to each other and avoid the extreme development effort. • WSDL: WSDL is known as the Web Services Description Language(WSDL). WSDL is an XML-based file which tells the client application what the web service does and gives all the information required to connect to the web service. • REST: REST stands for Representational State Transfer. REST is used to build Web services that are lightweight, maintainable, and scalable.
- 13. Advantage of Web Service? • Exposing Business Functionality on the network • Interoperability amongst applications • A Standardized Protocol which everybody understands • Reduction in cost of communication
- 14. Web Service Characteristics • They are XML-Based • Loosely Coupled • Synchronous or Asynchronous functionality • Ability to support Remote Procedure Calls (RPCs) • Supports Document Exchange
- 15. Example Soap Web service Rest Web service
- 16. References • www.hibernate.org • http://www.tutorialspoint.com/hibernate/hiberna • https://www.javatpoint.com/web-services-tutoria
- 17. Thank You !!! Feel free for asking a question -- Sagar Verma