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Typeorm decorators
The document provides a comprehensive overview of the TypeORM library, including decorators for defining entities, columns, and relationships. It outlines various methods for managing database interactions such as subscribers, transaction management, and different types of relations such as one-to-one, one-to-many, and many-to-many. Additionally, it discusses configurations for entity schemas, columns' attributes, and advanced topics like embedded entities and soft deletes.
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Typeorm decorators
- 1.
- 2. TOC • Entity • Column •Relation • Subscriber • Others
- 3.
- 4. Entity 1.1. Entity • name: •engine: • database: • schema: • synchronize: • orderBy:
- 5. Entity 1.1. Entity • mysqlschema 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.
- 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.
- 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 • relationid • entity
- 37.
- 38. Subscriber 4.1. Subscriber • DBCRUD • @AfterLoad - @AfterInsert/@BeforeInsert - @AfterUpdate/@BeforeUpdate - @AfterRemove/@BeforeRemove • ORM connector logging SQL •
- 39.
- 40.
- 41.
- 42. Others 5.1. Index ? • • 1 • / , > • • WHERE • • JOIN • /
- 43.
- 44.
- 45.
- 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.