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Schema declaration in models or separate configuration files.

Proper pagination for queries using joins.

Elegant-syntax, flexible and powerful QueryBuilder.

Cross-database and cross-schema queries.

Migrations and automatic migrations generation.

Supports multiple inheritance patterns.

Uni-directional, bi-directional and self-referenced relations.Supports both DataMapper and ActiveRecord (your choice).TypeORM is highly influenced by other ORMs, such as Hibernate, Maintainable applications the most productive way.

Which means you can write high quality, loosely coupled, scalable, Unlike all other JavaScript ORMs currently in existence, TypeORM supports both Active Record and Data Mapper patterns, Small applications with a few tables to large scale enterprise applications That help you to develop any kind of application that uses databases - from Its goal is to always support the latest JavaScript features and provide additional features In TypeOrm you need the database connection for that.That can run in NodeJS, Browser, Cordova, PhoneGap, Ionic, React Native, NativeScript, Expo, and Electron platformsĪnd can be used with TypeScript and JavaScript (ES5, ES6, ES7, ES8). respectively both requests couldn't find it and already decided they are gonna write it to the database.Ī pessimistic read lock is something you create manually. both create a super short-living write lock. Pessimistic lockĪ lock of the database is always created during writing to the database. One way to fix it, I will describe here implemented with TypeOrm. will just fail with an exception leaving the application crashing. You may prevent that easily by a unique key constraint.

Request B meanwhile asks whether that Tag exists.

Request A: asks whether that Tag exists.

(You think it is unlikely? Please read the note below the article!) When two requests to the backend occur at the exact same time, with the exact same string, two tags with the same name are inserted. In case it finds it, it retrieves it, otherwise it will create a new Tag Entity and retrieve that. In that method I lower-case the name and try to fetch tags from the data base with that homogenized name. When a user enters a tag "JavaScript", I have a method in the TagService called getOrCreateTag(name: string). I call these methods getOrCreate* methods.Īn example. I use a pattern in my services where I have methods that always return an Entity but it is up to that method whether to retrieve it from the database or create it newly.

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