Tips about hibernate with spring data jpa
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The presentation discusses best practices for using Hibernate with Spring Data JPA, emphasizing the importance of performance optimization and proper data access methods. It highlights common issues such as the N+1 query problem and lazy loading exceptions, along with solutions like fetch types and entity graphs. Various techniques and references are provided for managing relationships and handling large amounts of data efficiently.
Tips about hibernate with spring data jpa
- 1. Tips about Hibernate with SpringData JPA Thiago dos Santos Hora
- 2. Purpose of thispresentation
- 3. Purpose of thispresentation ● Alignment of knowledge
- 4. Purpose of thispresentation ● Alignment of knowledge ● Discuss best practices
- 5. Purpose of thispresentation ● Alignment of knowledge ● Discuss best practices ● Demonstrate problems and possible solutions
- 6. Purpose of thispresentation ● Alignment of knowledge ● Discuss best practices ● Demonstrate problems and possible solutions ● Review the way we use JPA
- 7. A little bitof 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.
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- 9. Be careful ● Asalways, 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.
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- 14. Starting with somethingsimple: Now, let's take a look at the generated query, just to make sure everything is fine...
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- 16. N+1 Query Problem ●Relationship ● Performance ● Fetching plan ● Select statement
- 17. How to solvethese problems?
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- 20. But sometimes youdo need the data. ● Lazy loading data
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- 23. But sometimes youdo need the data. ● Lazy loading data ● LazyInitializationException
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- 26. But sometimes youdo need the data. ● Lazy loading data ● LazyInitializationException ● Transactions
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- 28. Moving forward, it'stime to OneToOne mapping ● Mapping Lazy One to One Relationship
- 29. Adding author contactinformation
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- 32. Moving forward, it'stime to OneToOne mapping ● Mapping Lazy One to One Relationship ● Hibernate Issues
- 33. Hibernate one toone issue
- 34. Moving forward, it'stime to OneToOne mapping ● Mapping Lazy One to One Relationship ● Hibernate Issues ● Approches
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- 37. Moving forward, it'stime to OneToOne mapping ● Mapping Lazy One to One Relationship ● Hibernate Issues ● Approches ● Different alternatives to solve this
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- 50. Third, avoid thebidirectional mapping
- 51. Third, avoid thebidirectional mapping
- 52. OK, but whatif I need the all data? ● JPQL ● Join Fetch
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- 55. In case youdo not have defined the FetchType as Lazy
- 56. OK, but whatif I need the all data? ● JPQL ● Join Fetch ● Entity Graph
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- 59. In case youdo not have defined the FetchType as Lazy
- 60. If you wantto contribute with Hibernate
- 61. If you wantto contribute with Hibernate
- 62. OK, but whatif I need the all data? ● JPQL ● Join Fetch ● Entity Graph ● Named Entity Graph
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- 65. In case youdo not have defined the FetchType as Lazy
- 66. That is notall about EntityGraphs.
- 67. That is notall about EntityGraphs.
- 68. That is notall about EntityGraphs.
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- 71. What if youcannot update the Hibernate version? ● Specifications ● Base Repository ● Extend spring repository functionalities
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- 73. Solution * must havethe same name as the interface plus the suffix "Impl".
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- 77. Let us talkabout large amounts of data ● PagingAndSortingRepository ● Page Size ● Memory
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- 81. About the Batchingof operations ● Batching ● Size ● Define properties ● Make sure your Hibernate provides batching support for your DB
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- 87. Project on Github ●https://github.com/thiagohora/tipsabouthibernatespringdatajpa (Demo project)
- 88. References ● https://docs.spring.io/spring-data/jpa/docs/current/reference/html/ (Springdata 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)