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Jonghee Lee
Jonghee Lee

襦 螻 jpa basic concepts, OSIV, anti-patterns

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JPA 襦 螻 磯 JPA 2019-3-20 伎
Agenda 1. JPA Basic Concept 2. Entity Manager 3. Lazy Load 4. OSIV Pattern 5. Anti-Patterns
1. JPA basic concepts ( from Pro JPA2, 2nd Edition )
1. JPA basic concepts a. Persistence : bootstrap class used to obtain an entityManagerFactory
1. JPA basic concepts b. EntityManagerFactory - EntityManager襯 螳語り鍵 螳豌 - SpringFramework 企 れ EntityManagerFactoryBean 螻牛. - EntityManagerFactory Persistence Unit 襦 . - EntityManagerFactory 焔 貉れ 螳 覯襷 燕螻 螻旧伎 .
1. JPA basic concepts c. Persistence Unit - Named configuration declaring the entity classes and data store info - SpringBoot properties 曙伎 朱 れ 螳. - persistence.xml 蠍一.
1. JPA basic concepts d. EntityManager - Jpa 覈 覿覿 蟲 企麹. - @PersistenceContext ( ろ襷 企 覦朱 .. れ 覲旧″ 貅伎れ 螻殊 .)
1. JPA basic concepts d. Persistence Context - EntityManager螳 PersistenceContext襯 伎 entity 蟯襴襯 . < Entity Lifecycle, 100覯 螳譟壱企 讌豺讌 . > - 1谿 貂, 殊 覲伎, 覲蟆 螳讌
2. Entity Manager a. Flush : 一危磯伎れ 覦 蟆 flushing 企手 . - 螳 Flush : entityManager.flush() - 碁 commit - 貎朱Μ ろ 貉ろ語 螳 貎朱Μ 蟆郁骸 レ 覩語り 蟆曙 - FlushMode襯 れ朱 覲蟆 螳 . ( Always, Auto, Commit, Manual ) Q. FulshMode.Auto SpringDataJpa 襯 語 蟾 ? - Entity entityA = repositoryA.save(entityA) - entityA.setAttributeX(Y); - entityA = repositoryA.save(entityA); JPA 蟲豌 覲襦 蠏 危 蟆曙磯 .
2. Entity Manager b. Detached : entity螳 persistent 襯 覯企 - detach : entityManager.detach(entity) - context clear : entityManager.clear() - session 譬襭( close ) Persistent Entity螳 Detached 襦 螻 Transaction Session Close !!
2. Entity Manager c. Quiz : 覈視 螻褐 覈 谿場 覲伎語.
3. Lazy Load a. Proxy Object - What is di鍖erence? (in Spring Data JPA ) repository.getOne(Pk id); repository.鍖ndOne(Pk id); repository.鍖ndById(Pk id); https://docs.spring.io/spring-data/data-jpa/docs/current/api/ - Spring Data Jpa JavaDoc
3. Lazy Load b. What is Lazy Load ?
4. OSIV a. What is OSIV ( Open Session In View ) : 觀 襷 蟾讌 貉ろ碁ゼ ろ 豈襦 讌 蟆 ( To avoid the LazyInitializationException ) DB Connection ? DB Flush ? Transaction ? Detached ? Commit ? When ?
4. OSIV b. Using Servlet Filter ==> DB Flush, Release Connection, Detached State 覓語 : 覈誤 碁 蟆所, DB 貉るレ 覲伎 螳 讀螳
4. OSIV c. How to use in Spring Framework - OpenSessionInVewFilter - OpenSessionInViewInterceptor 1. Session Open -> FlushMode.MANUAL 2. Save currentSession into ThreadLocal ( to use single session ) 3. @Transactional - Get single session from ThreadLocal & change FlushMode.AUTO - Get Connection, begin Tx - Execute Tx - Commit ( Flush ) or Rollback - Release Connection - Change FlushMode.MANUAL 4. LazyLoad @Transactional 覦 讌 覲蟆暑 蟷 Flush - Get Connection ( auto commit mode ) - Execute & Release Connection 5. Session close ( change detached state )
4. OSIV c. How to use in Spring Framework
4. OSIV d. How to use in SpringBoot - open-in-view : true ( default option ) ( From https://terasolunaorg.github.io )
4. OSIV e. Is it Anti-Pattern? - Transaction 讌 螳 ( 旧 觚襴 覦 ) - 覈誤 Transaction 蟆所 (旧 觚襴 覦) - 豺 一危一 ( until session close ) - 覃覈襴 覓語襦 誤 焔レ or OOM Exception - 語讌 覈詩 Query (ex: N+1 Query ) OSIV 伎 襦 る - 觜 伎 ろ 覈 query 覈磯 - 螳覦 JPA 覦 OSIV 伎 襦 危 螻 伎狩. 企 蠏覈螳 朱 (螳語 蟆 伎襷 ) 螳覦 貉碁， る .. OSIV 伎 讌 覈詩蟆 螳 蟆 讌 蟾 ?
4. OSIV f. Quiz ( open-in-view = true 手 螳 螻 )
4. OSIV g. More details .. http://pds19.egloos.com/pds/201106/28/18/Open_Session_In_View_Pattern.pdf http://aeternum.egloos.com/2798098
5. Anti-Patterns a. OneToMany 覦 Company - Branch 1:N 蟯螻 譟一語 譯殊牡 Branch 企. 讀, Branch @ManyToOne 襷ろ 覃伎 companyId襯 譟一語錆殊朱 . - oneToMany 覦ル 朱 ! 覲 襷ろ 企 朱 蟇磯 ,,, Insert 讌 Update 貎朱Μ螳 ろ 蠍磯 . ( 朱 OneToMany JoinColumn 讌 蟆曙磯 蠍 讌襷 ,,, )
5. Anti-Patterns b. Batch task 蟯襴 ( Persistence Context 伎 ) Entity襯 螻朱蟆 譟壱 ( ex: Excel Download )
5. Anti-Patterns c. OneToMany Outer Join 蠍磯 伎 .. 蠍磯 蟆郁骸 襦 ろ 讌襷 ,,, HHH000104: firstResult/maxResults specified with collection fetch Limit 譟郁唄 讌 螻 譟郁唄 襷 豌 一危磯ゼ 譟壱 覃覈襴 襷 蟆郁骸襯 豢豢 譴. 企郁唄 ろ 譟一姶 讌 襦 -_- 譬 蟆 蠏豺 覦 JPA 蟲豌願 朱 襷 譬蟆.
5. Anti-Patterns d. N+1 Query OSIV れ る View 襷 DB Connection N覯 螳語 Query N覯 ろ
5. Anti-Patterns e. DDD ( 螻朱 .. )
5. Anti-Patterns f. Without QueryDsl 1. Spring Data JPA 2. @NamedQuery 3. @Query ( jpql / native )
5. Anti-Patterns g. Long-Term Transaction JPA 蟲 覓語 讌襷 ..
The end - 覈視 伎 る ? - 蟠蠍 伎 る ? http://donny00.tistory.com jonghee.lee@gmail.com donny.00@kakaopaycorp.com

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  • 1. JPA 襦 螻 磯 JPA 2019-3-20 伎
  • 2. Agenda 1. JPA Basic Concept 2. Entity Manager 3. Lazy Load 4. OSIV Pattern 5. Anti-Patterns
  • 3. 1. JPA basic concepts ( from Pro JPA2, 2nd Edition )
  • 4. 1. JPA basic concepts a. Persistence : bootstrap class used to obtain an entityManagerFactory
  • 5. 1. JPA basic concepts b. EntityManagerFactory - EntityManager襯 螳語り鍵 螳豌 - SpringFramework 企 れ EntityManagerFactoryBean 螻牛. - EntityManagerFactory Persistence Unit 襦 . - EntityManagerFactory 焔 貉れ 螳 覯襷 燕螻 螻旧伎 .
  • 6. 1. JPA basic concepts c. Persistence Unit - Named configuration declaring the entity classes and data store info - SpringBoot properties 曙伎 朱 れ 螳. - persistence.xml 蠍一.
  • 7. 1. JPA basic concepts d. EntityManager - Jpa 覈 覿覿 蟲 企麹. - @PersistenceContext ( ろ襷 企 覦朱 .. れ 覲旧″ 貅伎れ 螻殊 .)
  • 8. 1. JPA basic concepts d. Persistence Context - EntityManager螳 PersistenceContext襯 伎 entity 蟯襴襯 . < Entity Lifecycle, 100覯 螳譟壱企 讌豺讌 . > - 1谿 貂, 殊 覲伎, 覲蟆 螳讌
  • 9. 2. Entity Manager a. Flush : 一危磯伎れ 覦 蟆 flushing 企手 . - 螳 Flush : entityManager.flush() - 碁 commit - 貎朱Μ ろ 貉ろ語 螳 貎朱Μ 蟆郁骸 レ 覩語り 蟆曙 - FlushMode襯 れ朱 覲蟆 螳 . ( Always, Auto, Commit, Manual ) Q. FulshMode.Auto SpringDataJpa 襯 語 蟾 ? - Entity entityA = repositoryA.save(entityA) - entityA.setAttributeX(Y); - entityA = repositoryA.save(entityA); JPA 蟲豌 覲襦 蠏 危 蟆曙磯 .
  • 10. 2. Entity Manager b. Detached : entity螳 persistent 襯 覯企 - detach : entityManager.detach(entity) - context clear : entityManager.clear() - session 譬襭( close ) Persistent Entity螳 Detached 襦 螻 Transaction Session Close !!
  • 11. 2. Entity Manager c. Quiz : 覈視 螻褐 覈 谿場 覲伎語.
  • 12. 3. Lazy Load a. Proxy Object - What is di鍖erence? (in Spring Data JPA ) repository.getOne(Pk id); repository.鍖ndOne(Pk id); repository.鍖ndById(Pk id); https://docs.spring.io/spring-data/data-jpa/docs/current/api/ - Spring Data Jpa JavaDoc
  • 13. 3. Lazy Load b. What is Lazy Load ?
  • 14. 4. OSIV a. What is OSIV ( Open Session In View ) : 觀 襷 蟾讌 貉ろ碁ゼ ろ 豈襦 讌 蟆 ( To avoid the LazyInitializationException ) DB Connection ? DB Flush ? Transaction ? Detached ? Commit ? When ?
  • 15. 4. OSIV b. Using Servlet Filter ==> DB Flush, Release Connection, Detached State 覓語 : 覈誤 碁 蟆所, DB 貉るレ 覲伎 螳 讀螳
  • 16. 4. OSIV c. How to use in Spring Framework - OpenSessionInVewFilter - OpenSessionInViewInterceptor 1. Session Open -> FlushMode.MANUAL 2. Save currentSession into ThreadLocal ( to use single session ) 3. @Transactional - Get single session from ThreadLocal & change FlushMode.AUTO - Get Connection, begin Tx - Execute Tx - Commit ( Flush ) or Rollback - Release Connection - Change FlushMode.MANUAL 4. LazyLoad @Transactional 覦 讌 覲蟆暑 蟷 Flush - Get Connection ( auto commit mode ) - Execute & Release Connection 5. Session close ( change detached state )
  • 17. 4. OSIV c. How to use in Spring Framework
  • 18. 4. OSIV d. How to use in SpringBoot - open-in-view : true ( default option ) ( From https://terasolunaorg.github.io )
  • 19. 4. OSIV e. Is it Anti-Pattern? - Transaction 讌 螳 ( 旧 觚襴 覦 ) - 覈誤 Transaction 蟆所 (旧 觚襴 覦) - 豺 一危一 ( until session close ) - 覃覈襴 覓語襦 誤 焔レ or OOM Exception - 語讌 覈詩 Query (ex: N+1 Query ) OSIV 伎 襦 る - 觜 伎 ろ 覈 query 覈磯 - 螳覦 JPA 覦 OSIV 伎 襦 危 螻 伎狩. 企 蠏覈螳 朱 (螳語 蟆 伎襷 ) 螳覦 貉碁， る .. OSIV 伎 讌 覈詩蟆 螳 蟆 讌 蟾 ?
  • 20. 4. OSIV f. Quiz ( open-in-view = true 手 螳 螻 )
  • 21. 4. OSIV g. More details .. http://pds19.egloos.com/pds/201106/28/18/Open_Session_In_View_Pattern.pdf http://aeternum.egloos.com/2798098
  • 22. 5. Anti-Patterns a. OneToMany 覦 Company - Branch 1:N 蟯螻 譟一語 譯殊牡 Branch 企. 讀, Branch @ManyToOne 襷ろ 覃伎 companyId襯 譟一語錆殊朱 . - oneToMany 覦ル 朱 ! 覲 襷ろ 企 朱 蟇磯 ,,, Insert 讌 Update 貎朱Μ螳 ろ 蠍磯 . ( 朱 OneToMany JoinColumn 讌 蟆曙磯 蠍 讌襷 ,,, )
  • 23. 5. Anti-Patterns b. Batch task 蟯襴 ( Persistence Context 伎 ) Entity襯 螻朱蟆 譟壱 ( ex: Excel Download )
  • 24. 5. Anti-Patterns c. OneToMany Outer Join 蠍磯 伎 .. 蠍磯 蟆郁骸 襦 ろ 讌襷 ,,, HHH000104: firstResult/maxResults specified with collection fetch Limit 譟郁唄 讌 螻 譟郁唄 襷 豌 一危磯ゼ 譟壱 覃覈襴 襷 蟆郁骸襯 豢豢 譴. 企郁唄 ろ 譟一姶 讌 襦 -_- 譬 蟆 蠏豺 覦 JPA 蟲豌願 朱 襷 譬蟆.
  • 25. 5. Anti-Patterns d. N+1 Query OSIV れ る View 襷 DB Connection N覯 螳語 Query N覯 ろ
  • 26. 5. Anti-Patterns e. DDD ( 螻朱 .. )
  • 27. 5. Anti-Patterns f. Without QueryDsl 1. Spring Data JPA 2. @NamedQuery 3. @Query ( jpql / native )
  • 28. 5. Anti-Patterns g. Long-Term Transaction JPA 蟲 覓語 讌襷 ..
  • 29. The end - 覈視 伎 る ? - 蟠蠍 伎 る ? http://donny00.tistory.com jonghee.lee@gmail.com donny.00@kakaopaycorp.com