TypeORM으로 보는 마이그레이션과 N+1 문제
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- 마이그레이션과 N+1 문제 소개 - sequelize와 typeorm에서의 기능 비교 - 타 플랫폼 ORM과의 기능 비교
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TypeORM으로 보는 마이그레이션과 N+1 문제
- 1. Ian - 20.11.2020 ORM(Object Relational Mapper) Migration & N+1 Problem
- 2. • • • TypeORM • TypeORM vs. Sequelize • ORM • N+1 • & • TypeORM vs. Sequelize • ORM TOC
- 3. Migration Sequelize ? git vcs migration . migration , . migration . Migration (up), (down) .
- 4. Migration • sequelize orm • orm models, migrations, seeders • model, migration ORM ??
- 5. Migration • up, down • ? ? • migration ! Src/models/department.js Src/migrations/timestamp-department.js
- 6. Migration • • People.city country
- 7. Migration • sequelize, typeorm • if (isSync) • city country !
- 10. Migration • •
- 11. Migration • , • synchronize ! • association • migration
- 12. Migration • config .. .. • https://github.com/Yangeok/Today-I-learned/blob/master/ getting_ready_posting/2020-11-18-typeorm-theoritical.md • Migration:create, migration:generate, migration:run, migration:revert 4 !
- 13. Migration : Migration:create • Migration • Create
- 14. Migration : Migration:generate • Migration • generate !
- 15. Migration : Migration:run • Migartion • Migration up • ( ) up migrations •
- 16. Migration : Migration:revert • • Migration down • (LIFO) • Migrations row • Migration:revert:all typeorm
- 17. Migration TypeORM vs. Sequelize: migration • Sequelize • Entity Migration • Migration:generate typeorm migration:create • Migration:undo:all • typeorm • Entity migration migration:generate • schema:sync • Migration:revert migration
- 18. Migration TypeORM vs. Sequelize: seeding • Sequelize • typeorm
- 19. Migration TypeORM vs. Sequelize • Sequelize • migration:undo:all migration . • seeding cli up, down . • Typeorm • migration . • cli synchronize .
- 20. Migration ORM : Doctrine (PHP) • migration . • sequelize umzug migration hook cli .
- 21. Migration ORM : Active record (Ruby) • typeorm active record . • migration . • timestamp YYYYMMDDHHMMSS . ( : 20201120120000_test-migration-create.rb)
- 22. N+1 & • orm • 2 , 1 N N+1 • Orm • N+1 raw sql
- 23. N+1 & • People Companies • Companies People 1:M !
- 24. N+1 & • Select !
- 25. N+1 & • People Companies.department • ! 6(1+5) <- N+1
- 26. N+1 & • join N+1 ! • People
- 27. N+1 & : Eager loading • join !
- 28. N+1 & : Eager loading • • • • , • • Orders OrderDetails, Delivery , n+1 eager loading
- 29. N+1 & : Lazy loading • join n+1 lazy loading
- 30. N+1 & : Lazy loading • • ( db ..) • cpu • … • • sns • Eager loading • Lazy loading !
- 31. N+1 Problem TypeORM vs. Sequelize • typeorm eager loading . (Optional / eager loading) • lazy loading Promise generic type • . Eager loading Lazy loading
- 32. N+1 Problem TypeORM vs. Sequelize • sequelize find Include eager loading . ( lazy loading) • join . lazy loading include . Eager loading lazy loading
- 33. N+1 Problem ORM : CakeORM (PHP) • eager loading . contain . • lazy loading .
- 34. N+1 Problem ORM : JPA (Java) • eager loading . FetchType.EAGER . • lazy loading . FetchType.LAZY .
- 35. N+1 Problem ORM : Active record (Ruby) • eager loading . sequelize includes . • lazy loading .
- 36. EOF ,