Using TypeORM’s QueryBuilder in NestJS

NestJS is a modern JavaScript framework designed for building enterprise-level server-side applications, leveraging the latest JavaScript features and enforcing best practices. It supports TypeScript by default and integrates seamlessly with TypeORM, a popular object-relational mapper for Node.js, which is database-agnostic and supports both SQL and NoSQL databases. This text provides a guide on integrating TypeORM with NestJS, including setting up a basic application, configuring a SQLite database, and running queries using TypeORM's QueryBuilder. It highlights the ease of generating application structures with the NestJS CLI and offers insights into performing various database operations, such as CRUD operations and JOIN queries, using different APIs provided by TypeORM. The guide also emphasizes the advantages of using the QueryBuilder API for efficiency, especially when dealing with large datasets.