NestJS 与 TypeORM：如何使用 TypeORM 连接数据库并使实例可访问

Question

Can anyone let me know how to create an instance of the DB using TypeORM?

I would like to make it accessible as this service does but the Connection class is deprecated..

import { Inject, Injectable } from '@nestjs/common';
import { Connection, Repository } from 'typeorm';

@Injectable()
export class DatabaseService {
  constructor(@Inject('Connection') public connection: Connection) {
    console.log('!!!!')
  }
  public async getRepository<T>(entity: any): Promise<Repository<T>> {
    return this.connection.getRepository(entity);
  }
}

What is the alternative now?

How should I set up the DatabaseModule? In order to make it accessible? Using DataSource???

@Module({
  imports: [
    TypeOrmModule.forRootAsync({
      imports: [ConfigModule],
      inject: [ConfigService],
      useFactory: async (configService: ConfigService) => ({
        type: 'postgres',
        host: process.env.DB_HOST,
        port: +configService.get('DB_PORT'),
        username: configService.get('DB_USER'),
        password: configService.get('DB_PASSWORD'),
        database: configService.get('DB_NAME'),
        autoLoadEntities: true,
        synchronize: true,
      })
    })
  ],
  providers: [DatabaseService]
})

export class DatabaseModule {}

Thanks in advance.

Answer 1

Try to @InjectDataSource() instead of @InjectConnection() .

From TypeORM documentation :

TypeORM's DataSource holds your database connection settings and establishes initial database connection or connection pool depend on RDBMS you use.

From the DataSource you'll be able to access everything you need: EntityManager, QueryRunner, EntityMetadata, repositories and other. Here's the documentation for the DataSource API