TypeORM - Find with orderBy

TypeORM is a popular Object-Relational Mapping (ORM) library for TypeScript and JavaScript. It allows you to interact with your database using Object-Oriented Programming (OOP) principles and provides various methods for querying data efficiently.

In this guide, we will focus on the find method in TypeORM and how to use the orderBy option to sort the retrieved data.

Installation

First, let's install TypeORM using npm:

npm install typeorm

Make sure you have TypeScript installed as well:

npm install typescript

Importing TypeORM

To use TypeORM, import the necessary classes from the library:

import { createConnection, getRepository } from "typeorm";

Creating Connection

Before querying the database, we need to establish a connection. Use the createConnection function to create a connection to your database:

await createConnection({
  // Connection configuration options
});

Querying with find and orderBy

To retrieve data from the database, use the find method provided by the Repository class. It returns an array of all matching entities:

const userRepository = getRepository(User);
const users = await userRepository.find({
  // Query options
});

To sort the retrieved data, utilize the orderBy option. It takes an object where the keys represent the columns to sort by, and the values define the sorting order (ASC for ascending and DESC for descending):

const users = await userRepository.find({
  orderBy: {
    name: "ASC",
    age: "DESC",
  },
});

Putting It All Together

Here's a complete example that demonstrates the usage of find with orderBy:

import { createConnection, getRepository } from "typeorm";

async function getUsers() {
  await createConnection({
    // Connection configuration options
  });

  const userRepository = getRepository(User);
  const users = await userRepository.find({
    orderBy: {
      name: "ASC",
      age: "DESC",
    },
  });

  console.log(users);
}

getUsers();

Remember to replace User with your actual entity class.

Conclusion

By using the find method in TypeORM and the orderBy option, you can retrieve data from your database and sort it according to your needs. TypeORM provides a convenient way to work with databases in a type-safe and efficient manner.

For more information, refer to the TypeORM documentation.