Architecture
An ORM is a programming library that automatically translates between the object-oriented data models used in application code and the relational tables and SQL queries used in a database, eliminating most manual SQL writing.
Without an ORM, developers must write raw SQL strings within application code and manually map result rows to programming language objects — a tedious process prone to SQL injection vulnerabilities if parameterisation is skipped. ORMs provide an abstraction where application models are defined as classes (e.g., a User class with name and email attributes), and the ORM generates the corresponding database tables, handles migrations when the schema changes, and translates method calls like User.findAll({ where: { active: true } }) into optimised SQL. Popular ORMs include Hibernate (Java), SQLAlchemy (Python), ActiveRecord (Ruby on Rails), Prisma (Node.js), and Eloquent (Laravel/PHP). The trade-off is that ORMs can generate inefficient queries for complex operations, so experienced developers know when to bypass the ORM and write raw SQL for performance-critical paths.
Example
A Django application uses the built-in ORM to define a Product model and perform queries like Product.objects.filter(category='electronics', price__lt=5000) without writing a single line of SQL.
Related terms
Database
A database is an organised collection of structured or semi-structured data stored electronically and managed by a database management system (DBMS) that enables efficient querying, insertion, update, and deletion of records.
SQL (Structured Query Language)
SQL is the standardised query language used to create, read, update, and delete data in relational databases, as well as to define schemas and control access permissions.
Backend
Backend refers to the server-side layer of an application that handles business logic, data processing, authentication, and communication with databases and third-party services — invisible to the end user but powering everything they experience.
MVC (Model-View-Controller)
MVC is a software design pattern that separates an application into three interconnected components: the Model (data and business logic), the View (user interface presentation), and the Controller (input handling and coordination between Model and View).
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