- 데코레이터 소개 - entity - column - relation - subscriber - others - 개념 소개 - sql view - soft delete - index - transaction

1. Ian - 11.12.2020
TypeORM
Decorators

2. TOC
• Entity
• Column
• Relation
• Subscriber
• Others

3. Entity

4. Entity
1.1. Entity
• name:
• engine:
• database:
• schema:
• synchronize:
• orderBy:

5. Entity
1.1. Entity
• mysql schema database
• table < schema < database
(oracle db)
• schema

6. Entity
1.2. SQL view ?
•
• , view
• 1 view
•
•

7. Entity
1.3. ViewEntity
• @ViewColumn
• name:
• database:
• schema:
• expression: sql
queryBuilder

8. Entity
1.3. ViewEntity -
• ,
ViewEntity view

9. Entity
1.4. entity column
• id, title, description DRY ?
• 3

10. Entity
1.4. entity column - Concrete table inheritance
•

11. Entity
1.4. entity column - Single table inheritance
•
• Content
• @TableInheritance, @ChildEntity

12. Entity
1.4. entity column - Embedded entities
• ,
• nameFirst, nameLast

13. Entity
1.4. entity column -
• Concrete table inheritance:
• Single table inheritance: @TableInheritance, @ChildEntity .
@TableInheritance
• Embedded entities:
• id, createdAt, updatedAt
Concrete table inheritance

14. Column

15. Column
2.1. Column
• type:
• length:
• onUpdate: cascading ON UPDATE
• nullable: false NOT NULL
• default:
• unique: false constraint
• enum: enum
• enumName: enum
• transformer: json boolean integer
Type
Enum
Transformer

16. Column
2.2. ID, Date - ID
• @PrimaryColumn: pk
• @PrimaryGeneratedColumn:
AUTO_INCREMENT id uuid
• @Generated: pk uuid
PrimaryGeneratedColumn
Generated

17. Column
2.2. ID, Date - Date
• DATETIME
• @CreateDateColumn:
• @UpdateDateColumn:
• @DeleteDateColumn: soft delete
CreateDateColumn
UpdateDateColumn
DeleteDateColumn

18. Column
2.3. Soft delete ?
• , deletedAt
• UPDATE
•
• JOIN
•

19. Relation

20. Relation
3.1. 1:1/1:N/M:N
• 1:1
• ,
• M:N
• ,

21. Relation
3.1. 1:1/1:N/M:N - 1:1 - Entity
• @OneToOne uni-directional, bi-
directional
• @JoinColumn
•

22. Relation
3.1. 1:1/1:N/M:N - 1:1 - SQL desc
• DESC profile; DESC user;

23. Relation
3.1. 1:1/1:N/M:N - 1:1 - Relation query
•
• 2
User Profile

24. Relation
3.1. 1:1/1:N/M:N - 1:N - Entity
• User Photo 1:N (User has many Photos, Photo belongs to User)
• @JoinColumn
• @OneToMany @ManyToOne
• @ManyToOne @OneToMany

25. Relation
3.1. 1:1/1:N/M:N - 1:N - SQL desc
• DESC photo; DESC user;

26. Relation
3.1. 1:1/1:N/M:N - 1:N - Relation query
•
• 2
• photos

27. Relation
3.1. 1:1/1:N/M:N - M:N - Entity
• junction @JoinTable
• @ManyToMany uni-directional,
bi-directional

28. Relation
3.1. 1:1/1:N/M:N - M:N - SQL desc
• DESC category; DESC question; DESC question_categories_category;

29. Relation
3.1. 1:1/1:N/M:N - M:N - Relation query
•
• 2
• categories.questions

30. Relation
3.2. Self join ?
• 1 -
• : < <
• : < <
• : / / < / < /
• 4

31. Relation
3.2. 1:1/M:N - Adjacency list
• @ManyToOne, @OneToMany
• JOIN (4 )

32. Relation
3.2. 1:1/M:N - Nested set/Materialized path/Closure table
• @Tree, @TreeChildren, @TreeParent
• Nested set: ↓ / ↑
• Materialized path (aka Path enumeration):
• Closure table: ↑ / ↑
nested-set |
materialized-path |
closure-table

33. Relation
3.2. 1:1/M:N -
• @Tree* .
adjacency list
@Tree*

34. Relation
3.3. Join* - JoinColumn
•
• . categoryId
• @ManyToOne , @OneToOne

35. Relation
3.3. Join* - JoinTable
• N:M junction
• junction source

36. Relation
3.4. RelationId
• relation id
• entity

37. Subscriber

38. Subscriber
4.1. Subscriber
• DB CRUD
• @AfterLoad - @AfterInsert/@BeforeInsert - @AfterUpdate/@BeforeUpdate -
@AfterRemove/@BeforeRemove
• ORM connector logging SQL
•

39. Subscriber
4.1. Subscriber
•

40. Others

41. Others
5.1. Index ?
• .. 😭

42. Others
5.1. Index ?
•
• 1
• / , >
•
• WHERE
•
• JOIN
• /

43. Others
5.2. Index
•
•

44. Others
5.3. Unique
•
• Index

45. Others
5.4. Check
• /

46. Others
5.5. Transaction ?
• ,
• DB
•
•
•
•
• transaction locking
• 3

47. Others
5.6. Transaction - Transaction method
• 1
• READ UNCOMMITTED
• READ COMMITTED
• REPEATABLE READ
• SERIALIZABLE

48. Others
5.6. Transaction - Decorators
• @Transaction, @TransactionManager, @TransactionRepository
• 2

49. Others
5.6. Transaction - Query runner
•
• startTransaction:
• commitTransaction:
• rollbackTransaction:

50. EOF,
Ian - 10.12.2020