如何在typeorm中使用存储库？

import { Entity, Column, PrimaryGeneratedColumn, BaseEntity } from 'typeorm';
import { Repository, createConnection } from 'typeorm';

@Entity()
class User extends BaseEntity {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  name: string;

  @Column()
  age: number;
}

class UserRepository extends Repository<User> {}

async function main() {
  const connection = await createConnection({
    type: 'mysql',
    host: 'localhost',
    port: 3306,
    username: 'root',
    password: 'password',
    database: 'your_database',
    entities: [User],
    synchronize: true,
  });

  const userRepository = connection.getCustomRepository(UserRepository);

  const user = new User();
  user.name = 'John Doe';
  user.age = 25;

  await userRepository.save(user);

  const savedUser = await userRepository.findOne({ name: 'John Doe' });
  console.log(savedUser);
}

main().catch(console.error);