Managing Multiple Databases with TypeORM

Introduction: Why is Multiple Database Management Needed with TypeORM?

In modern software projects, it is a common requirement for applications to work with more than one database. The topic "Managing Multiple Databases with TypeORM" especially comes to the forefront in large-scale Node.js projects when there is a need to use multiple databases. TypeORM makes developers' work much easier by offering easy integration with different databases and a flexible structure.

Multiple Database Configuration with TypeORM

To use more than one database in a project, you can benefit from TypeORM's Connection and DataSource infrastructure. In this way, independent connection details can be created for each database. For "Managing Multiple Databases with TypeORM", a configuration as below can be made:

Defining Multiple Databases

import { DataSource } from "typeorm";

export const firstDb = new DataSource({
  type: "mysql",
  host: "localhost",
  port: 3306,
  username: "root",
  password: "password1",
  database: "db_one",
  entities: ["src/entity/*.ts"],
  synchronize: true,
});

export const secondDb = new DataSource({
  type: "postgres",
  host: "localhost",
  port: 5432,
  username: "postgres",
  password: "password2",
  database: "db_two",
  entities: ["src/entity/*.ts"],
  synchronize: true,
});

Using Database Connections

// To initialize connections:
await firstDb.initialize();
await secondDb.initialize();

// To perform an operation:
const userRepo = firstDb.getRepository(User); // works with db_one
const orderRepo = secondDb.getRepository(Order); // works with db_two

Conclusion: Advantages of Managing Multiple Databases with TypeORM

Thanks to Managing Multiple Databases with TypeORM, you can easily define and manage more than one different type or same type database in your applications. This structure not only offers advantages for data integrity, performance optimization, and flexibility, but also makes it possible to use different data stores together in microservice architectures. For every developer seeking a flexible and scalable architecture, TypeORM is a powerful solution partner.