Tips about hibernate with spring data jpa
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This presentation is about best practices when using hibernate and Spring Data JPA. I'm sharing commons problems and possible solutions to them, and also the demo project is in Github, I hope you like.
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Tips about hibernate with spring data jpa
- 1. Tips about Hibernate with Spring Data JPA Thiago dos Santos Hora
- 2. Purpose of this presentation
- 3. Purpose of this presentation ● Alignment of knowledge
- 4. Purpose of this presentation ● Alignment of knowledge ● Discuss best practices
- 5. Purpose of this presentation ● Alignment of knowledge ● Discuss best practices ● Demonstrate problems and possible solutions
- 6. Purpose of this presentation ● Alignment of knowledge ● Discuss best practices ● Demonstrate problems and possible solutions ● Review the way we use JPA
- 7. A little bit of context ● JPA: Java Persistence API, Java specification responsible for defining a standard way to work with ORM between different providers. ● Hibernate: Started in 2001, the most popular ORM Java Framework. ● Spring Data JPA: One of the best spring projects, abstracts all the data access layer using interface and removing almost all boilerplate. In other words, these tools help us to focus on business logic instead of writing the same repetitive code over and over again, thus making the developers more business oriented.
- 9. Be careful ● As always, everything comes at a price. ● When we are dealing with a critical system where performance is paramount, we need to pay closer attention to the way we access our data, in order to use strictly the bare- minimum. ● These frameworks can help us, but, without the correct use of the tools that they provide us with, we can end up having big performance problems. So, let's look at some of these potential problems.
- 10. Our scenario
- 11. Our scenario
- 12. Our scenario
- 13. Our scenario
- 14. Starting with something simple: Now, let's take a look at the generated query, just to make sure everything is fine...
- 15. Surprise!!!
- 16. N+1 Query Problem ● Relationship ● Performance ● Fetching plan ● Select statement
- 17. How to solve these problems?
- 19. Output
- 20. But sometimes you do need the data. ● Lazy loading data
- 21. Example
- 22. Problem Output:
- 23. But sometimes you do need the data. ● Lazy loading data ● LazyInitializationException
- 24. Solution
- 25. Solution
- 26. But sometimes you do need the data. ● Lazy loading data ● LazyInitializationException ● Transactions
- 27. Solution
- 28. Moving forward, it's time to OneToOne mapping ● Mapping Lazy One to One Relationship
- 29. Adding author contact information
- 30. Example
- 31. What?
- 32. Moving forward, it's time to OneToOne mapping ● Mapping Lazy One to One Relationship ● Hibernate Issues
- 33. Hibernate one to one issue
- 34. Moving forward, it's time to OneToOne mapping ● Mapping Lazy One to One Relationship ● Hibernate Issues ● Approches
- 35. Example
- 36. Not yet…
- 37. Moving forward, it's time to OneToOne mapping ● Mapping Lazy One to One Relationship ● Hibernate Issues ● Approches ● Different alternatives to solve this
- 42. First, bytecode enhancement. Running options
- 43. First, bytecode enhancement. Running options
- 50. Third, avoid the bidirectional mapping
- 51. Third, avoid the bidirectional mapping
- 52. OK, but what if I need the all data? ● JPQL ● Join Fetch
- 53. Solution
- 54. Solution
- 55. In case you do not have defined the FetchType as Lazy
- 56. OK, but what if I need the all data? ● JPQL ● Join Fetch ● Entity Graph
- 57. Example
- 58. Example
- 59. In case you do not have defined the FetchType as Lazy
- 60. If you want to contribute with Hibernate
- 61. If you want to contribute with Hibernate
- 62. OK, but what if I need the all data? ● JPQL ● Join Fetch ● Entity Graph ● Named Entity Graph
- 63. Example
- 64. Output
- 65. In case you do not have defined the FetchType as Lazy
- 66. That is not all about EntityGraphs.
- 67. That is not all about EntityGraphs.
- 68. That is not all about EntityGraphs.
- 69. Solution
- 70. Solution
- 71. What if you cannot update the Hibernate version? ● Specifications ● Base Repository ● Extend spring repository functionalities
- 72. Solution
- 73. Solution * must have the same name as the interface plus the suffix "Impl".
- 74. Solution
- 75. Solution
- 76. Solution
- 77. Let us talk about large amounts of data ● PagingAndSortingRepository ● Page Size ● Memory
- 78. Example
- 79. Example
- 80. Output
- 81. About the Batching of operations ● Batching ● Size ● Define properties ● Make sure your Hibernate provides batching support for your DB
- 82. Example
- 83. Example
- 84. Example
- 85. Example
- 86. Output
- 87. Project on Github ● https://github.com/thiagohora/tipsabouthibernatespringdatajpa (Demo project)
- 88. References ● https://docs.spring.io/spring-data/jpa/docs/current/reference/html/ (Spring data jpa documentation) ● https://hibernate.org/orm/documentation/5.4/ (Hibernate documentation) ● https://hibernate.atlassian.net/browse/HHH-9515 (One-to-one issue) ● https://vladmihalcea.com/the-best-way-to-map-a-onetoone-relationship-with-jpa-and- hibernate/(Best way to map one-to-one) ● http://justonjava.blogspot.com/2010/09/lazy-one-to-one-and-one-to-many.html (one-to-one inverse relationship) ● https://hibernate.atlassian.net/browse/HHH-8776 (Entity graphs handle no lazy attributes) ● https://www.baeldung.com/jpa-entity-graph (What the entity graph tries to resolve) ● https://blog.ippon.tech/boost-the-performance-of-your-spring-data-jpa-application/ (Boost the performance of your Spring data jpa app) ● https://hibernate.atlassian.net/browse/HHH-10297 (Entity graph in clause issue) ● https://www.solidsyntax.be/2013/10/17/fetching-collections-hibernate/ (FetchMode)
- 89. References ● https://vladmihalcea.com/how-to-batch-insert-and-update-statements-with-hibernate/ ● https://vladmihalcea.com/the-best-way-to-map-a-onetoone-relationship-with-jpa-and-hibernate/ ● https://www.baeldung.com/spring-data-jpa-batch-inserts ● https://vladmihalcea.com/how-to-customize-the-jdbc-batch-size-for-each-persistence-context- with-hibernate/ (Batching operations)