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Persistence
- 1. Ennovation – Behind the Products Anish Alex, CTO
- 2. Java Persistence Problem • Closest native language support – Serialization • Lifecycle – Begins and Ends with JVM • Identity – Equals / Hashcode / Memory Location • Data Types – Int/long/string.. • RDBMS – Long term persistence / Primary Key – SQL – VARCHAR / NUMBER 2 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 3. Java Persistence Technologies • Object Relational Mappers – ORM’s – Map Java objects to Relational database table records e.g. – Top Link / Hibernate • Java Data Objects (JDO) – Apache jdo • JDBC • Java Persistence API (JPA) – Hibernate – Top Link – Open JPA • EJB • Custom 3 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 4. Java Persistence Technologies 4 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 6. Hibernate - Relational Persistence for Java • XML file to map POJO to Tables • Configuration • Classes to bootstrap the framework • JPA Implementation 6 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 8. Hibernate ORM • Generators – native – increment – sequence – assigned – hilo / identify / uuid.hex / uuid.string / foreign • Version – Prevents invalid overwrites • Property – String – specify length – BigDecimal – specify precision/scale – Date / Timestamp / Long - nothing to specify 8 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 9. Hibernate ORM • References – http://www.mkyong.com/tutorials/hibernate- tutorials/ – http://docs.jboss.org/hibernate/orm/3.3/refe rence/en/html/index.htmlPrevents invalid overwrites – Sample code - http://codeserver/demo- repository/svndemo/anisht/trunk/training/hib ernate 9 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 10. Hibernate ORM • To-Do – One-to-Many using foreign keys – Many-to-One – Many-to-One using foreign keys – One-to-One – Run the same examples against SQL Server 10 Evolvus Solutions. Proprietary and Confidential, do not copy, duplicate or distribute.
- 11. THANK YOU !! Questions / Contact
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- 1. Behind the products 2. IT management peace of mind Freedom of choice Any relational database - oracle/mysql/mssql/db2 Any application server - JBoss, Websphere, Weblogic - even Tomcat! Any os - Windows, Linux, *nix Any hardware - well, almost :-) - no mainframes Good corporate citizen Integrates with monitoring systems - Integrates with various SSO systems - Siteminder, CAS, AD, Custom Solutions Easy test instance creation Built in purge/backup solution Test automation Minimal IT involvement 3. High performance/High Scalability 4. Industrial strength Cluster enabled - Application and database failover 5. Open Source No Vendor Lock-in Community Contribution 6. Device inclusive Tablets / Smart Phones / Desktop
- Closest to persistence in Java means Serialization Objects created and destroyed based on scope, GC frequency – eventually JVM Objects identified by Memory location by default, or by overriding the equals/hashcode methods No Mapping to Relational databases – Primary Key / Foreign Key / Data type constraints
- Several competition mechanisms to solve the problem of Java Object Persistence ORM -> Object to Relational Database JDO -> Object to File/XML/Relational database – Multiple targets, JDOQL, Annotations, XML Custom like iBatis -> Using SQL/Stored Procedures JPA -> Object to Relational Database, JQL, Annotations JDBC -> Using SQL’s EJB’s -> Entity Beans
- Configure which database you want to connect to / the dialect, driver etc.