如何在 NestJS 中使用多个 sequelize DB 连接

Question

我正在使用 NestJS文档中关于如何设置 Sequelize DB 连接的示例。 如何使用 Sequelize 和 TypeScript for NestJS 建立与两个以上数据库的连接。

Answer 1

您可以在您的databaseProviders设置多个Sequelize连接：

export const databaseProviders = [
  {
    provide: 'SequelizeCatToken',
    useFactory: async () => {
      const sequelize = new Sequelize({
        dialect: 'mysql',
        host: 'localhost',
        port: 3306,
        username: 'catroot',
        password: 'catpassword',
        database: 'cats',
      });
      sequelize.addModels([Cat]);
      await sequelize.sync();
      return sequelize;
    },
  },  
  {
    provide: 'SequelizeDogToken',
    useFactory: async () => {
      const sequelize = new Sequelize({
        dialect: 'mysql',
        host: 'localhost',
        port: 3306,
        username: 'doogroot',
        password: 'dogpassword',
        database: 'dogs',
      });
      sequelize.addModels([Dog]);
      await sequelize.sync();
      return sequelize;
    },
  },
];

Answer 2

您必须为连接使用name ，这是强制性的。

const defaultOptions = {
  dialect: 'postgres',
  port: 5432,
  username: 'user',
  password: 'password',
  database: 'db',
  synchronize: true,
};

@Module({
  imports: [
    SequelizeModule.forRoot({
      ...defaultOptions,
      host: 'user_db_host',
      models: [User],
    }),
    SequelizeModule.forRoot({
      ...defaultOptions,
      name: 'albumsConnection',
      host: 'album_db_host',
      models: [Album],
    }),
  ],
})
export class AppModule {}

这是Nest 中的文档