Creating Custom Primary Key Generated Column Value

Looking for a way to create some custom Primary Key value generated for Column in entity and that should be auto incremented.

Ex: @Entity(“DemandRecord”) export class DemandRecord {

@CustomColumn()
 demandRecordNumber: number;

Ex:- demandRecordNumber values should be like YYYYMMDD001,YYYYMMDD002..like this where YYYYMMDD is year,month and date.

Am i not able to find any approach for this. In Hibernate we have ways to this but in TypeORM..i am not able to find any documents regarding this

[pleerock]

There is no need for additional functionality in there.

Alternative to that approach you can do:

@Entity()
export class Post {

   @PrimaryColumn()
   id: string;

  @BeforeInsert()
  private beforeInsert() {
         this.id = generateAnything();
  }

}

[webleaf]

@pleerock for example in SQLite (primary column in SQLite is autogenerated too) if I try to do something like this (saving multiply objects at once)

@Entity()
class SomeClass {

    @PrimaryColumn()
    public id: number;

    @AfterInsert()
    private async afterInsert() {
        const result = await getRepository(SomeClass).query("SELECT last_insert_rowid() last_id");
        this.id = result[0]["last_id"]
    }

    constructor(id?: number) {
        if (typeof id === "number") {
            this.id = id
        }
    }
}

getRepository(SomeClass).save([
    new SomeClass(-3),
    new SomeClass(-2),
    new SomeClass(), // expect -1, but afterInsert will get 2
    new SomeClass(), // expect 0, but afterInsert will get 2
    new SomeClass(), // expect 1, but afterInsert will get 2
    new SomeClass(), // expect 2, but afterInsert will get 2
]);

Such log will be produced:

JS: query: BEGIN TRANSACTION
JS: query: INSERT INTO "some_class"("id") VALUES (?) -- PARAMETERS: [-3]
JS: query: INSERT INTO "some_class"("id") VALUES (?) -- PARAMETERS: [-2]
JS: query: INSERT INTO "some_class"("id") VALUES (NULL) -- PARAMETERS: []
JS: query: INSERT INTO "some_class"("id") VALUES (NULL) -- PARAMETERS: []
JS: query: INSERT INTO "some_class"("id") VALUES (NULL) -- PARAMETERS: []
JS: query: INSERT INTO "some_class"("id") VALUES (NULL) -- PARAMETERS: []
JS: query: SELECT last_insert_rowid() last_id
JS: query: SELECT last_insert_rowid() last_id
JS: query: SELECT last_insert_rowid() last_id
JS: query: SELECT last_insert_rowid() last_id
JS: query: SELECT last_insert_rowid() last_id
JS: query: COMMIT

And all objects with undefined id will get id 2, because all @AfterInsert executes after all insert queries.