TypeORM is an ORM for TypeScript and JavaScript that maps decorated classes to tables in PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, Oracle and other databases. Use when a user asks to define entities and relations, query with repositories or QueryBuilder, set up a DataSource, generate and run migrations, or upgrade a project from TypeORM 0.3 to 1.x — for example "add a column with a migration", "migration:generate cannot open my data-source.ts", or "findOneBy throws on an undefined value after the upgrade".
