DB created, updated in JPA

!!!!!!
http://blog.jhades.org/how-does-spring-transactional-really-work/
!!!!!!




http://www.tutorialspoint.com/hibernate/hibernate_query_language.htm

https://gist.github.com/anonymous/3410579

http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-lookup-strategies



http://www.3riverdev.com/tutorial-spring-hibernate-hikaricp/

http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.at-query

https://stackoverflow.com/questions/23630123/how-to-configure-datasource-with-hikaricp-in-spring-configuration-class

http://www.petrikainulainen.net/programming/spring-framework/spring-data-jpa-tutorial-three-custom-queries-with-query-methods/

http://java-persistence-performance.blogspot.com.es/2012/05/jpql-vs-sql-have-both-with-eclipselink.html

https://stackoverflow.com/questions/12162928/sum-of-values-from-two-different-entities-in-jpa

http://zeroturnaround.com/rebellabs/how-to-use-jpa-correctly-to-avoid-complaints-of-a-slow-application/

http://java-persistence-performance.blogspot.com/2011/06/how-to-improve-jpa-performance-by-1825.html

https://stackoverflow.com/questions/11938253/jpa-joincolumn-vs-mappedby

https://stackoverflow.com/questions/21762328/java-hibernate-onetoone-mapping

// save - updata

https://stackoverflow.com/questions/1069992/jpa-entitymanager-why-use-persist-over-merge
https://stackoverflow.com/questions/9649515/how-to-get-id-of-last-persisted-entity-using-jpa
https://stackoverflow.com/questions/183013/hibernate-comparing-current-previous-record


// Transaction marked as rollback only

https://stackoverflow.com/questions/19302196/transaction-marked-as-rollback-only-how-do-i-find-the-cause
https://stackoverflow.com/questions/19495381/can-not-handle-hibernate-exceptions-inside-transactional-methods-in-spring-app