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mikro-orm
Advanced tools
Simple typescript ORM for node.js based on data-mapper, unit-of-work and identity-map patterns. Supports MongoDB, MySQL and SQLite databases.
Mikro-ORM is a TypeScript ORM for Node.js based on Data Mapper, Unit of Work, and Identity Map patterns. It supports multiple databases including MongoDB, MySQL, PostgreSQL, SQLite, and MariaDB. It provides a powerful and flexible way to interact with your database using TypeScript and JavaScript.
Entity Definition
Defines an entity with properties that map to database columns. The `@Entity` decorator marks the class as a database entity, while `@PrimaryKey` and `@Property` decorators define the primary key and other properties respectively.
```typescript
import { Entity, PrimaryKey, Property } from 'mikro-orm';
@Entity()
class User {
@PrimaryKey()
id!: number;
@Property()
name!: string;
@Property()
email!: string;
}
```
CRUD Operations
Demonstrates basic Create, Read, Update, and Delete (CRUD) operations. The `persistAndFlush` method saves a new entity to the database, and the `find` method retrieves entities from the database.
```typescript
const user = new User();
user.name = 'John Doe';
user.email = 'john.doe@example.com';
await orm.em.persistAndFlush(user);
const users = await orm.em.find(User, {});
console.log(users);
```
Query Builder
Shows how to use the query builder to construct and execute complex queries. The `createQueryBuilder` method creates a new query builder instance, and the `select` and `where` methods build the query.
```typescript
const qb = orm.em.createQueryBuilder(User);
const users = await qb.select('*').where({ name: 'John Doe' }).execute();
console.log(users);
```
Transactions
Illustrates how to perform operations within a transaction. The `transactional` method ensures that all operations within the callback are executed within a single transaction.
```typescript
await orm.em.transactional(async em => {
const user = new User();
user.name = 'Jane Doe';
user.email = 'jane.doe@example.com';
await em.persistAndFlush(user);
});
```
TypeORM is another TypeScript ORM for Node.js that supports Active Record and Data Mapper patterns. It is highly popular and supports multiple databases. Compared to Mikro-ORM, TypeORM has a larger community and more extensive documentation, but Mikro-ORM offers a more modern and flexible API.
Sequelize is a promise-based Node.js ORM for Postgres, MySQL, MariaDB, SQLite, and Microsoft SQL Server. It is known for its simplicity and ease of use. While Sequelize is more mature and has a larger user base, Mikro-ORM provides better TypeScript support and more advanced features like Unit of Work and Identity Map patterns.
Objection.js is an SQL-friendly ORM for Node.js, built on top of the SQL query builder Knex.js. It aims to stay as close to the SQL syntax as possible while providing a powerful and flexible API. Compared to Mikro-ORM, Objection.js offers more control over raw SQL queries but lacks some of the higher-level abstractions and features provided by Mikro-ORM.
Simple typescript ORM for node.js based on data-mapper, unit-of-work and identity-map patterns. Supports MongoDB, MySQL and SQLite databases.
Heavily inspired by doctrine.
Fist install the module via yarn
or npm
and do not forget to install the database driver as well:
$ yarn add mikro-orm mongodb # for mongo
$ yarn add mikro-orm mysql2 # for mysql
$ yarn add mikro-orm sqlite # for sqlite
or
$ npm i -s mikro-orm mongodb # for mongo
$ npm i -s mikro-orm mysql2 # for mysql
$ npm i -s mikro-orm sqlite # for sqlite
Then call MikroORM.init
as part of bootstrapping your app:
const orm = await MikroORM.init({
entitiesDirs: ['entities'], // relative to `baseDir`
dbName: 'my-db-name',
clientUrl: '...', // defaults to 'mongodb://localhost:27017' for mongodb driver
baseDir: __dirname, // defaults to `process.cwd()`
});
console.log(orm.em); // EntityManager
Then you will need to fork entity manager for each request so their identity maps will not
collide. To do so, use the RequestContext
helper:
const app = express();
app.use((req, res, next) => {
RequestContext.create(orm.em, next);
});
More info about RequestContext
is described here.
Now you can start defining your entities (in one of the entitiesDirs
folders):
@Entity()
export class Book {
@PrimaryKey()
_id: ObjectID;
@Property()
createdAt = new Date();
@Property({ onUpdate: () => new Date() })
updatedAt = new Date();
@Property()
title: string;
@ManyToOne() // when you provide correct type hint, ORM will read it for you
author: Author;
@ManyToOne({ entity: () => Publisher }) // or you can specify the entity as class reference or string name
publisher: Publisher;
constructor(title: string, author: Author) {
this.title = title;
this.author = author;
}
}
export interface Book extends IEntity { }
You will need to extend Book's interface with IEntity
or your entity must extend BaseEntity
which does that for you. IEntity
interface represents internal methods added to your entity's
prototype via @Entity
decorator.
With your entities set up, you can start using entity manager and repositories as described
in following section. For more examples, take a look at
tests/EntityManager.mongo.test.ts
.
To save entity state to database, you need to persist it. Persist takes care or deciding
whether to use insert
or update
and computes appropriate change-set. Entity references
that are not persisted yet (does not have identifier) will be cascade persisted automatically.
// use constructors in your entities for required parameters
const author = new Author('Jon Snow', 'snow@wall.st');
author.born = new Date();
const publisher = new Publisher('7K publisher');
const book1 = new Book('My Life on The Wall, part 1', author);
book1.publisher = publisher;
const book2 = new Book('My Life on The Wall, part 2', author);
book2.publisher = publisher;
const book3 = new Book('My Life on The Wall, part 3', author);
book3.publisher = publisher;
// just persist books, author and publisher will be automatically cascade persisted
await orm.em.persist([book1, book2, book3]);
// or one by one
await orm.em.persist(book1, false);
await orm.em.persist(book2, false);
await orm.em.persist(book3); // flush everything to database at once
EntityManager
To fetch entities from database you can use find()
and findOne()
of EntityManager
:
API:
EntityManager.getRepository<T extends IEntity>(entityName: string): EntityRepository<T>;
EntityManager.find<T extends IEntity>(entityName: string, where?: FilterQuery<T>, populate?: string[], orderBy?: { [k: string]: 1 | -1; }, limit?: number, offset?: number): Promise<T[]>;
EntityManager.findOne<T extends IEntity>(entityName: string, where: FilterQuery<T> | string, populate?: string[]): Promise<T>;
EntityManager.merge<T extends IEntity>(entityName: string, data: any): T;
EntityManager.getReference<T extends IEntity>(entityName: string, id: string): T;
EntityManager.remove(entityName: string, where: IEntity | any): Promise<number>;
EntityManager.removeEntity(entity: IEntity): Promise<number>;
EntityManager.count(entityName: string, where: any): Promise<number>;
EntityManager.persist(entity: IEntity | IEntity[], flush?: boolean): Promise<void>;
EntityManager.flush(): Promise<void>;
EntityManager.clear(): void;
EntityManager.canPopulate(entityName: string, property: string): boolean;
Example:
const author = orm.em.findOne(Author.name, '...id...');
const books = orm.em.find(Book.name, {});
for (const author of authors) {
console.log(author.name); // Jon Snow
for (const book of author.books) {
console.log(book.title); // initialized
console.log(book.author.isInitialized()); // true
console.log(book.author.id);
console.log(book.author.name); // Jon Snow
console.log(book.publisher); // just reference
console.log(book.publisher.isInitialized()); // false
console.log(book.publisher.id);
console.log(book.publisher.name); // undefined
}
}
EntityRepository
instead of EntityManager
More convenient way of fetching entities from database is by using EntityRepository
, that
carries the entity name so you do not have to pass it to every find
and findOne
calls:
API:
EntityRepository.persist(entity: IEntity, flush?: boolean): Promise<void>;
EntityRepository.findOne(where: FilterQuery<IEntity> | string, populate?: string[]): Promise<IEntity>;
EntityRepository.find(where: FilterQuery<IEntity>, populate?: string[], orderBy?: { [k: string]: 1 | -1; }, limit?: number, offset?: number): Promise<IEntity[]>;
EntityRepository.findAll(populate?: string[], orderBy?: { [k: string]: 1 | -1; }, limit?: number, offset?: number): Promise<IEntity[]>;
EntityRepository.remove(where: IEntity | any): Promise<number>;
EntityRepository.flush(): Promise<void>;
EntityRepository.canPopulate(property: string): boolean;
EntityRepository.count(where?: any): Promise<number>;
Example:
const booksRepository = orm.em.getRepository<Book>(Book.name);
// with sorting, limit and offset parameters, populating author references
const books = await booksRepository.find({ author: '...' }, ['author'], { title: -1 }, 2, 1);
console.log(books); // Book[]
To use custom repository, just extend EntityRepository<T>
class:
export class CustomAuthorRepository extends EntityRepository<Author> {
// your custom methods...
public findAndUpdate(...) {
// ...
}
}
And register your repository as @Entity
decorator:
@Entity({ customRepository: () => CustomAuthorRepository })
export class Publisher {
// ...
}
Note that we need to pass that repository reference inside a callback so we will not run into circular dependency issues when using entity references inside that repository.
Now you can access your custom repository via EntityManager.getRepository()
method.
MikroORM
uses identity map in background so you will always get the same instance of
one entity.
const authorRepository = orm.em.getRepository<Author>(Author.name);
const jon = await authorRepository.findOne({ name: 'Jon Snow' }, ['books']);
const authors = await authorRepository.findAll(['books']);
// identity map in action
console.log(jon === authors[0]); // true
If you want to clear this identity map cache, you can do so via EntityManager.clear()
method:
orm.em.clear();
You should always keep unique identity map per each request. This basically means that you need to clone entity manager and use the clone in request context. There are two ways to achieve this:
With fork()
method you can simply get clean entity manager with its own context and identity map:
const em = orm.em.fork();
RequestContext
helper for DI containersIf you use dependency injection container like inversify
or the one in nestjs
framework, it
can be hard to achieve this, because you usually want to access your repositories via DI container,
but it will always provide you with the same instance, rather than new one for each request.
To solve this, you can use RequestContext
helper, that will use node
's async hooks in the background
to isolate the request context. MikroORM will always use request specific (forked) entity manager
if available, so all you need to do is to create new request context preferably in middle:
app.use((req, res, next) => {
RequestContext.create(orm.em, next);
});
Every single entity relation is mapped to an entity reference. Reference is an entity that has only its identifier. This reference is stored in identity map so you will get the same object reference when fetching the same document from database.
You can call await entity.init()
to initialize the entity. This will trigger database call
and populate itself, keeping the same reference in identity map.
const author = orm.em.getReference('...id...');
console.log(author.id); // accessing the id will not trigger any db call
console.log(author.isInitialized()); // false
console.log(author.name); // undefined
await author.init(); // this will trigger db call
console.log(author.isInitialized()); // true
console.log(author.name); // defined
Internally, MikroORM
never calls entity constructor, so you are free to use it as you wish.
The constructor will be called only when you instantiate the class yourself via new
operator,
so it is a handy place to require your data when creating new entity.
For example following Book
entity definition will always require to set title
and author
,
but publisher
will be optional:
@Entity({ collection: 'books-table' })
export class Book {
@PrimaryKey()
_id: ObjectID;
@Property()
title: string;
@ManyToOne()
author: Author;
@ManyToOne()
publisher: Publisher;
@ManyToMany({ entity: () => BookTag, inversedBy: 'books' })
tags = new Collection<BookTag>(this);
constructor(title: string, author: Author) {
this.title = title;
this.author = author;
}
}
export interface Book extends IEntity { }
You can use lifecycle hooks to run some code when entity gets persisted. You can mark any of entity methods with them, you can also mark multiple methods with same hook.
@BeforeCreate()
and @BeforeUpdate()
is fired right before we persist the entity in database
@AfterCreate()
and @AfterUpdate()
is fired right after the entity is updated in database and
merged to identity map. Since this event entity will have reference to EntityManager
and will be
enabled to call entity.init()
method (including all entity references and collections).
@BeforeDelete()
is fired right before we delete the record from database. It is fired only when
removing entity or entity reference, not when deleting records by query.
@AfterDelete()
is fired right after the record gets deleted from database and it is unset from
the identity map.
ObjectID
and string
duality (MongoDriver)Every entity has both ObjectID
and string
id available, also all methods of EntityManager
and EntityRepository
supports querying by both of them.
const author = orm.em.getReference('...id...');
console.log(author.id); // returns '...id...'
console.log(author._id); // returns ObjectID('...id...')
// all of those will return the same results
const article = '...article id...'; // string id
const book = '...book id...'; // string id
const repo = orm.em.getRepository<Author>(Author.name);
const foo1 = await repo.find({ id: { $in: [article] }, favouriteBook: book });
const bar1 = await repo.find({ id: { $in: [new ObjectID(article)] }, favouriteBook: new ObjectID(book) });
const foo2 = await repo.find({ _id: { $in: [article] }, favouriteBook: book });
const bar2 = await repo.find({ _id: { $in: [new ObjectID(article)] }, favouriteBook: new ObjectID(book) });
OneToMany
and ManyToMany
collections are stored in a Collection
wrapper. It implements
iterator so you can use for of
loop to iterate through it.
const author = orm.em.findOne(Author.name, '...', ['books']); // populating books collection
// or we could lazy load books collection later via `init()` method
await author.books.init();
for (const book of author.books) {
console.log(book.title); // initialized
console.log(book.author.isInitialized()); // true
console.log(book.author.id);
console.log(book.author.name); // Jon Snow
console.log(book.publisher); // just reference
console.log(book.publisher.isInitialized()); // false
console.log(book.publisher.id);
console.log(book.publisher.name); // undefined
}
// collection needs to be initialized before you can work with it
author.books.add(book);
console.log(author.books.contains(book)); // true
author.books.remove(book);
console.log(author.books.contains(book)); // false
author.books.add(book);
console.log(author.books.count()); // 1
author.books.removeAll();
console.log(author.books.contains(book)); // false
console.log(author.books.count()); // 0
console.log(author.books.getItems()); // Book[]
console.log(author.books.getIdentifiers()); // array of string | number
console.log(author.books.getIdentifiers('_id')); // array of ObjectID
OneToMany
collectionsOneToMany
collections are inverse side of ManyToOne
references, to which they need to point via fk
attribute:
@Entity()
export class Book {
@PrimaryKey()
_id: ObjectID;
@ManyToOne()
author: Author;
}
@Entity()
export class BookTag {
@PrimaryKey()
_id: ObjectID;
@OneToMany({ entity: () => Book, fk: 'author' })
books = new Collection<Book>(this);
}
ManyToMany
collectionsAs opposed to SQL databases, with MongoDB we do not need to have join tables for ManyToMany
relations.
All references are stored as an array of ObjectID
s on owning entity.
Unidirectional ManyToMany
relations are defined only on one side, and marked explicitly as owner
:
@ManyToMany({ entity: () => Book, owner: true })
books = new Collection<Book>(this);
Bidirectional ManyToMany
relations are defined on both sides, while one is owning side (where references are store),
marked by inversedBy
attribute pointing to the inverse side:
@ManyToMany({ entity: () => BookTag, inversedBy: 'books' })
tags = new Collection<BookTag>(this);
And on the inversed side we define it with mappedBy
attribute poining back to the owner:
@ManyToMany({ entity: () => Book, mappedBy: 'tags' })
books = new Collection<Book>(this);
IEntity.assign()
When you want to update entity based on user input, you will usually have just plain
string ids of entity relations as user input. Normally you would need to use
EntityManager.getReference()
to create references from each id first, and then
use those references to update entity relations:
const jon = new Author('Jon Snow', 'snow@wall.st');
const book = new Book('Book', jon);
book.author = orm.em.getReference<Author>(Author.name, '...id...');
Same result can be easily achieved with IEntity.assign()
:
book.assign({
title: 'Better Book 1',
author: '...id...',
});
console.log(book.title); // 'Better Book 1'
console.log(book.author); // instance of Author with id: '...id...'
console.log(book.author.id); // '...id...'
To use mikro-orm
with MySQL database, do not forget to install mysql2
dependency and provide
MySqlDriver
class when initializing ORM.
Similarly for SQLite install sqlite
dependency and provide SqliteDriver
.
Then call MikroORM.init
as part of bootstrapping your app:
const orm = await MikroORM.init({
entitiesDirs: ['entities'], // relative to `baseDir`
dbName: 'my-db-name',
driver: MySqlDriver,
});
Currently you will need to maintain the database schema yourself.
ManyToMany
collections with pivot tablesAs opposed to MongoDriver
, in MySQL we use pivot tables to handle ManyToMany
relations:
CREATE TABLE `publisher_to_test` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`publisher_id` int(11) DEFAULT NULL,
`test_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
You can adjust the name of pivot table via pivotTable
option in @ManyToMany
decorator
defined on owning side:
// for unidirectional
@ManyToMany({ entity: () => Test.name, owner: true, pivotTable: 'publisher2test' })
tests = new Collection<Test>(this);
// for bidirectional
@ManyToMany({ entity: () => BookTag, inversedBy: 'books', pivotTable: 'book2tag' })
tags = new Collection<BookTag>(this);
QueryBuilder
to execute native SQL queriesWhen you need to execute some SQL query without all the ORM stuff involved, you can either
compose the query yourself, or use the QueryBuilder
helper to construct the query for you:
const qb = orm.em.createQueryBuilder(Author.name);
qb.update({ name: 'test 123', type: PublisherType.GLOBAL }).where({ id: 123, type: PublisherType.LOCAL });
console.log(qb.getQuery());
// 'UPDATE `publisher2` SET `name` = ?, `type` = ? WHERE `id` = ? AND `type` = ?'
console.log(qb.getParams());
// ['test 123', PublisherType.GLOBAL, 123, PublisherType.LOCAL]
// run the query
const driver = orm.em.getDriver<MySqlDriver>();
const res1 = await driver.execute(qb);
// or run query without using QueryBuilder
const res2 = await driver.execute('SELECT ? + ?', [1, 2]);
QueryBuilder
provides fluent interface with these methods:
QueryBuilder.select(fields: string | string[]): QueryBuilder;
QueryBuilder.insert(data: any): QueryBuilder;
QueryBuilder.update(data: any): QueryBuilder;
QueryBuilder.delete(cond: any): QueryBuilder;
QueryBuilder.count(fields: string | string[]): QueryBuilder;
QueryBuilder.where(cond: any): QueryBuilder;
QueryBuilder.populate(populate: string[]): QueryBuilder;
QueryBuilder.limit(limit: number, offset?: number): QueryBuilder;
QueryBuilder.offset(offset: number): QueryBuilder;
QueryBuilder.getQuery(): string;
QueryBuilder.getParams(): any;
For more examples of how to work with QueryBuilder
, take a look at QueryBuilder
tests in
tests/QueryBuilder.test.ts
.
MySQL driver provides basic support for transactions via begin/commit/rollback
methods on both
MySqlDriver
and their shortcuts on EntityManager
as well.
You can also use EntityManager.transactional(cb)
helper to run callback in transaction. It will
provide forked EntityManager
as a parameter with clear clear isolated identity map - please use that
to make changes.
// if an error occurs inside the callback, all db queries from inside the callback will be rolled back
await orm.em.transactional(async (em: EntityManager) => {
const god = new Author('God', 'hello@heaven.god');
await em.persist(god);
});
EntityManager.begin(): Promise<void>;
EntityManager.commit(): Promise<void>;
EntityManager.rollback(): Promise<void>;
EntityManager.transactional(cb: (em: EntityManager) => Promise<any>): Promise<any>;
Keep in mind transactions are supported only in MySQL driver currently.
MySqlDriver
defaults to UnderscoreNamingStrategy
, which means your all your database tables and
columns will be lower-cased and words divided by underscored:
CREATE TABLE `author` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`created_at` datetime(3) DEFAULT NULL,
`updated_at` datetime(3) DEFAULT NULL,
`terms_accepted` tinyint(1) DEFAULT NULL,
`name` varchar(255) DEFAULT NULL,
`email` varchar(255) DEFAULT NULL,
`born` datetime DEFAULT NULL,
`favourite_book_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
You can also provide your own naming strategy, just implement NamingStrategy
interface and provide
your implementation when bootstrapping ORM:
class YourCustomNamingStrategy implements NamingStrategy {
...
}
const orm = await MikroORM.init({
...
namingStrategy: YourCustomNamingStrategy,
...
});
Sometimes you need to perform some bulk operation, or you just want to populate your
database with initial fixtures. Using ORM for such operations can bring unnecessary
boilerplate code. In this case, you can use one of nativeInsert/nativeUpdate/nativeDelete
methods:
EntityManager.nativeInsert<T extends IEntity>(entityName: string, data: any): Promise<IPrimaryKey>;
EntityManager.nativeUpdate<T extends IEntity>(entityName: string, where: FilterQuery<T>, data: any): Promise<number>;
EntityManager.nativeDelete<T extends IEntity>(entityName: string, where: FilterQuery<T> | any): Promise<number>;
Those methods execute native driver methods like Mongo's insertOne/updateMany/deleteMany
collection methods respectively.
This is common interface for all drivers, so for MySQL driver, it will fire native SQL queries.
Keep in mind that they do not hydrate results to entities, and they do not trigger lifecycle hooks.
They are also available as EntityRepository
shortcuts:
EntityRepository.nativeInsert(data: any): Promise<IPrimaryKey>;
EntityRepository.nativeUpdate(where: FilterQuery<T>, data: any): Promise<number>;
EntityRepository.nativeDelete(where: FilterQuery<T> | any): Promise<number>;
There is also shortcut for calling aggregate
method (available in MongoDriver
only):
EntityManager.aggregate(entityName: string, pipeline: any[]): Promise<any[]>;
EntityRepository.aggregate(pipeline: any[]): Promise<any[]>;
MirkoORM
will validate your properties before actual persisting happens. It will try to fix wrong
data types for you automatically. If automatic conversion fails, it will throw an error. You can
enable strict mode to disable this feature and let ORM throw errors instead. Validation is triggered
when persisting the entity.
// number instead of string will throw
const author = new Author('test', 'test');
author.assign({ name: 111, email: 222 });
await orm.em.persist(author); // throws "Validation error: trying to set Author.name of type 'string' to '111' of type 'number'"
// string date with unknown format will throw
author.assign(author, { name: '333', email: '444', born: 'asd' });
await orm.em.persist(author); // throws "Validation error: trying to set Author.born of type 'date' to 'asd' of type 'string'"
// string date with correct format will be auto-corrected
author.assign({ name: '333', email: '444', born: '2018-01-01' });
await orm.em.persist(author);
console.log(author.born).toBe(true); // instance of Date
// Date object will be ok
author.assign({ born: new Date() });
await orm.em.persist(author);
console.log(author.born).toBe(true); // instance of Date
// null will be ok
author.assign({ born: null });
await orm.em.persist(author);
console.log(author.born); // null
// string number with correct format will be auto-corrected
author.assign({ age: '21' });
await orm.em.persist(author);
console.log(author.age); // number 21
// string instead of number with will throw
author.assign({ age: 'asd' });
await orm.em.persist(author); // throws "Validation error: trying to set Author.age of type 'number' to 'asd' of type 'string'"
author.assign({ age: new Date() });
await orm.em.persist(author); // throws "Validation error: trying to set Author.age of type 'number' to '2019-01-17T21:14:23.875Z' of type 'date'"
author.assign({ age: false });
await orm.em.persist(author); // throws "Validation error: trying to set Author.age of type 'number' to 'false' of type 'boolean'"
FAQs
TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, PostgreSQL and SQLite databases as well as usage with vanilla JavaScript.
The npm package mikro-orm receives a total of 166,678 weekly downloads. As such, mikro-orm popularity was classified as popular.
We found that mikro-orm demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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