index.md

layout
homepage

MikroORM is TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns.

Currently it supports MongoDB, MySQL, MariaDB, PostgreSQL and SQLite databases, but more can be supported via custom drivers right now. It has first class TypeScript support, while staying back compatible with Vanilla JavaScript.

Heavily inspired by Doctrine and Nextras Orm.

Table of contents

• Overview
  • Installation & Usage
  • Defining Entities
  • Persisting, Cascading and Fetching Entities with EntityManager
  • Using EntityRepository instead of EntityManager
• Fundamentals
  • Identity Map and Request Context
  • Entity References and Reference<T> Wrapper
  • Using Entity Constructors
  • Modelling Relationships
  • Collections
  • Unit of Work
  • Transactions
  • Cascading persist and remove
• Advanced Features
  • Smart Nested Populate
  • Smart Query Conditions
  • Using QueryBuilder
  • Serializing
  • Updating Entity Values with IEntity.assign()
  • Property Validation
  • Lifecycle Hooks
  • Naming Strategy
  • Metadata Cache
  • Debugging
  • Schema Generator
  • Entity Generator
  • Read Replica Connections
• Usage with Different Drivers
  • Usage with SQL Drivers
  • Usage with MongoDB
• Recipes
  • Usage with NestJS
  • Usage with Vanilla JS
  • Creating Custom Driver
  • Using Multiple Schemas
• Example Integrations
  • Express + MongoDB + TypeScript
  • Nest + MySQL + TypeScript
  • Express + MongoDB + JavaScript

Articles

• Introducing MikroORM, TypeScript data-mapper ORM with Identity Map
  • on medium.com
  • on dev.to
• Handling transactions and concurrency in MikroORM
  • on medium.com
  • on dev.to