Hibernate Mapping on the Fly
5 likes2,663 views
The document is a presentation on persistence with Hibernate. It discusses Hibernate concepts like object relational mapping, caching, batch processing, full text search using Lucene and validation of objects. It also provides details on the course topics, how the online course works and contact information for enrolling in the exclusive course on persistence with Hibernate offered by Edureka.
![Slide 5 www.edureka.co/persistence-with-hibernate
Provides a simple API for storing and retrieving Java objects directly to and from the database
Non-intrusive: No need to follow specific rules or design patterns
Transparent: Your object model is unaware
ORM using Hibernate
JavaObject
int id;
String name;
String getName()
int getId()
void setName(String)
SQL Table
id [int] primary key,
name [varchar(50)],
Magic Happens Here
(O/R Mapper – i.e. Hibernate)](https://image.slidesharecdn.com/pers-150416011546-conversion-gate02/85/Hibernate-Mapping-on-the-Fly-5-320.jpg)
Hibernate Mapping on the Fly
- 1. www.edureka.co/persistence-with-hibernate Hibernate Mapping on the Fly View Persistence with Hibernate course details at www.edureka.co/persistence-with-hibernate For Queries: Post on Twitter @edurekaIN: #askEdureka Post on Facebook /edurekaIN For more details please contact us: US : 1800 275 9730 (toll free) INDIA : +91 88808 62004 Email Us : sales@edureka.co
- 2. Slide 2 www.edureka.co/persistence-with-hibernate Batch Processing in Hibernate Application Performance Optimization with Caching Bring the Power of Search to your Hibernate App How to Validate Application Constraints At the end of this module, you will be able to understand: Objectives
- 3. Slide 3 www.edureka.co/persistence-with-hibernate Hibernate An Object relational mapping library of java language for Object persistence and SQL databases Transparent persistence of java objects with relational database Provides query language in sync with SQL Open source library Provides solutions for object relational impedance mismatch problems
- 4. Slide 4 www.edureka.co/persistence-with-hibernate Objective is to solve the complexities existed in EJB2 persistence architecture Provided an effective Java persistence API enabling hibernate to work with different databases easily Annotations provide meta data about table column definitions at the model level Entities are developed independent of the underlying database JavaEE with Hibernate Derby MySQL Oracle HIBERNATE
- 5. Slide 5 www.edureka.co/persistence-with-hibernate Provides a simple API for storing and retrieving Java objects directly to and from the database Non-intrusive: No need to follow specific rules or design patterns Transparent: Your object model is unaware ORM using Hibernate JavaObject int id; String name; String getName() int getId() void setName(String) SQL Table id [int] primary key, name [varchar(50)], Magic Happens Here (O/R Mapper – i.e. Hibernate)
- 6. Slide 6 www.edureka.co/persistence-with-hibernate Batch Processing Processing bulk records into database in a particular time is called batch processing Processing bulk records is a tedious task because CRUD has to be performed in all the records in a sequence With the help of batch processing running program multiple times can be avoided For multiple transactions code will be run only once instead of running for each transaction
- 7. Slide 7 www.edureka.co/persistence-with-hibernate Memory Issue Since hibernate caches the objects will it result in OutOfMemoryException. If that’s the case how to avoid it?
- 8. Slide 8 www.edureka.co/persistence-with-hibernate Batch Processing with Hibernate Since hibernate caches persistent objects it will end up in out of memory for huge records In order to overcome this hibernate has configurations defined internally By configuring hibernate to insert the rows in batch, one can achieve batch processing in hibernate One can also disable the cache of hibernate during the process hibernate.jdbc.batch_size 50 hibernate.cache.use_second_level_cache false
- 9. Slide 9 www.edureka.co/persistence-with-hibernate DEMO - Batch Processing With Hibernate
- 10. Slide 10 www.edureka.co/persistence-with-hibernate Hibernate Caching Caching is used in-order to improve the performance of applications Effectively used by hibernate for caching at object level as well as the query level Improves performance by caching objects which in turn reduces the database hits to a greater extent Techniques used for Caching in hibernate are » First-level Cache » Second-level Cache » Query level cache Database First-level Cache Session Object Second-level Cache Client Hibernate
- 11. Slide 11 www.edureka.co/persistence-with-hibernate Types of Caching First Level Cache Data are cached at the session level Default cache of hibernate Cached objects exists as long as session is active Mandatory cache used by hibernate across all applications Second Level Cache An optional cache Cache at the session factory level Not enabled by default hence need to enable it explicitly Second Level Cache implementations : » EHCache » Swarm Cache » OS Cache » JBoss Cache Query Level Cache Enabled by hibernate.cache.use_query_cache="true“ Holds the complete query result in cache
- 12. Slide 12 www.edureka.co/persistence-with-hibernate Hibernate First Level Cache Database Hibernate Session Load Hibernate Session Is Data Available in Session YES NO
- 13. Slide 13 www.edureka.co/persistence-with-hibernate NO NO Is Data Available in Session Factory Database Hibernate Session Load Hibernate SessionIs Data Available in Session YES Hibernate Second Level Cache Hibernate Session Factory YES
- 14. Slide 14 www.edureka.co/persistence-with-hibernate DEMO - Optimizing performance using cache
- 15. Slide 15 www.edureka.co/persistence-with-hibernate Lucene – Full text search An Apache library Full text search capability Developed on java API Query results are returned by relevance Fast, flexible and stable Easy to integrate lucence search functionality to application..
- 16. Slide 16 www.edureka.co/persistence-with-hibernate How hibernate can perform search on the database with lucene, as lucene can do effective searching on file system Hibernate and Lucene Together
- 17. Slide 17 www.edureka.co/persistence-with-hibernate Hibernate Search Even though Lucence provides very efficient search capabilities, suffers with several mismatches with domain object models Hibernate Search built on top of the Lucence search engine to address the short comings of lucence in domain object models. Similarly to Hibernate which has been built in top of the SQL databases , Hibernate search built on top of Lucence Hibernate address the short comings of lucence in domain object models with annotations Manages entities when query made to database or as lucence query to index Hibernate + Hibernate Search Database Lucence (Index) Search Request
- 18. Slide 18 www.edureka.co/persistence-with-hibernate Hibernate Search Dependencies Hibernate search dependencies are provided in the hibernate-search-4.5.2.Final.jar Dependencies can be downloaded from the following locations http://sourceforge.net/projects/hibernate/files/hiberna te-search/ http://repository.jboss.org/nexus/content/groups/publi c-jboss/org/hibernate/ Other required dependencies for hibernate search are available from the following location http://sourceforge.net/projects/hibernate/files/hiberna te4/
- 19. Slide 19 www.edureka.co/persistence-with-hibernate Hibernate Search Query DSL Easy and efficient API for hibernate search Queries are created via QueryBuilder with the help of SearchFactory QueryBuilder is an interface from the package org.hibernate.search.query.dsl Once created can be easily attached with an entity Queries are created on top of QueryBuilder QueryBuilder queryBuilder = searchFactory.buildQueryBuilder().forEntity(MyEntity.class).get(); builder.range().onField("numberOfPages").above(1000).excludeLimit().createQuery();
- 20. Slide 20 www.edureka.co/persistence-with-hibernate DEMO - Hibernate Search
- 21. Slide 21 www.edureka.co/persistence-with-hibernate Validation of Beans Process of verifying data follows pre-defined constraints Validations of beans are basically constraints on object models via annotations Validations can also be defined with custom constraints Since bean validation is a java specification effective APIs can be used for validating the beans Validations of beans has to done on or before persistence of data in-order to maintain data integrity
- 22. Slide 22 www.edureka.co/persistence-with-hibernate Validation in Applications Validations can be applied at any stage of application Validation can be applied at the web layer ,service layer or at the repository layer Custom constraints can be applied with custom validations Generally validations are preferred more in repository layer to maintain data integrity Web/Presentation Database Service Repository Users Validations
- 23. Slide 23 www.edureka.co/persistence-with-hibernate Constraints Restrictions/Conditions applied at fields Belongs to javax.validation.constraints Applied on top of fields with annotations like @NotNull, @Min etc. Can be applied at field, class and property AssertFalse The annotated element must be false. AssertFalse.List Defines several @AssertFalse annotations on the same element AssertTrue The annotated element must be true. AssertTrue.List Defines several @AssertTrue annotations on the same element DecimalMax The annotated element must be a number whose value must be lower or equal to the specified maximum. DecimalMax.List Defines several @DecimalMax annotations on the same element DecimalMin The annotated element must be a number whose value must be higher or equal to the specified minimum. Reference : http://docs.oracle.com/javaee/6/api/javax/validation/constraints/package-summary.html
- 24. Slide 24 www.edureka.co/persistence-with-hibernate DEMO - Hibernate Validator
- 25. Slide 25 www.edureka.co/persistence-with-hibernate Course Topics Module 1 » Introduction to ORM and Hibernate Module 2 » Persistence and Session Factory Module 3 » Association, Mapping & Inheritance Module 4 » Criteria and Query Language Module 5 » Transactions ,Filter and Performance Module 6 » Search and Validation Framework Module 7 » OGM, NoSQL and Spring Module 8 » Project
- 26. Slide 26 LIVE Online Class Class Recording in LMS 24/7 Post Class Support Module Wise Quiz Project Work Verifiable Certificate www.edureka.co/persistence-with-hibernate How it Works?
- 27. Slide 27 www.edureka.co/persistence-with-hibernate Exclusive On Persistence with Hibernate Course To avail this offer please contact us: US : 1800 275 9730 (toll free) INDIA : +91 88808 62004 Email Us : sales@edureka.co
- 29. Slide 29 Course Url