TypeORM & Repository

createConnection method in src/Entities/Connection file is responsible for creating database connection.

Then, Repositories handles database interactions with getManager method of TypeORM.

Here is a planet Entity example from example app;

//#region Global Imports
import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';
//#endregion Global Imports

@Entity()
export class Planet {
    @PrimaryGeneratedColumn()
    id: number;

    @Column()
    name: string;

    @Column()
    shield: number;
}

And this is Planet repository;

//#region Global Imports
import { getManager } from 'typeorm';
//#endregion Global Imports

//#region Local Imports
import { Planet } from '@Entities/Planet';
import { getResource } from './Shared';
//#endregion Local Imports

//#region Interface Imports
import { DecreaseShieldOutDto } from '@Interfaces';
//#endregion Interface Imports

export namespace PlanetRepository {
    export const Get = async (planetName: string): Promise<Planet> => {
        return await getResource(Planet, { name: planetName });
    };

    export const DecreaseShield = async (
        planetName: string,
        remainingShield: number,
    ): Promise<DecreaseShieldOutDto> => {
        const planet = await getResource(Planet, { name: planetName });

        planet.shield = remainingShield;

        await getManager().save(planet);

        return { remainingShield: planet.shield };
    };
}

Refer to offical documentation for detailed usage.