Objects to database rows translator
Day 120 of 149
👉 Full deep-dive with code examples
The Translator Analogy
In a foreign country, a translator converts between languages.
ORM translates between your code and the database.
You work with objects. ORM converts them to SQL.
Without vs With ORM
# Raw SQL
cursor.execute(
"INSERT INTO users (name) VALUES (?)",
("Alice",)
)
# ORM
user = User(name="Alice")
session.add(user)
Much cleaner!
Common ORMs
| Language | ORM |
|---|---|
| Python | SQLAlchemy |
| JavaScript | Prisma |
| Java | Hibernate |
| Ruby | ActiveRecord |
Benefits
- Write code in your language
- SQL injection protection
- Handle relationships naturally
- Switch databases easily
Watch Out For
N+1 Problem: 100 users = 101 queries if not careful. Use eager loading!
In One Sentence
ORM maps database tables to programming objects, letting you interact with data using your language instead of SQL.
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