Summary - SQL database

Combine Pool, parameterized queries and transactions to write a sales API.

Summary - SQL database

In this group you learned PostgreSQL and Node.js: the pg module, connection pooling with Pool, security with parameterized queries, integrity with transactions, and ORM with Sequelize.

Raw SQL (pg) gives control; an ORM (Sequelize) gives speed. Small projects often use pg; large ones often use Sequelize. Both rely on parameterized queries and transactions as core tools. Security is never optional: always keep user data separate.

pg vs Sequelize

pg lets you write raw SQL; full control but more code. Sequelize generates SQL for you; less code but less control. The two can be used together.

The choice: pg for small or performance-critical projects; Sequelize for large teams and rapid development. If the ORM falls short on complex queries you can drop to raw SQL with sq.query(). The key point: whichever you pick, use parameterized queries.

Exercise Log the type of Pool

Import the Pool class from pg. Log typeof Pool.

Show example solution

const { Pool } = require("pg");
console.log(typeof Pool);

Test yourself

What is the foundation of SQL database security?
- Network acceleration
- File compression
- Updating CSS
- Parametreli sorgu
Show answer

Parametreli sorgu — Parameterized queries prevent SQL injection.
Match each piece to its role

pg

PostgreSQL client
Pool

Connection pool
parameterized query

Security
Sequelize

ORM

Next lesson: ws module

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