PostgreSQL / MySQL with Node.js
📌 Covered in this chapter:
Creating Tables · INSERT/SELECT/UPDATE/DELETE · Joins · Prepared Statements
Connect Node.js to a relational database and perform CRUD operations with raw SQL queries.
1PostgreSQL / MySQL with Node.js — What You'll Learn
Connect Node.js to a relational database and perform CRUD operations with raw SQL queries.
Here's everything this chapter covers, in the order you'll learn it:
- Installing PostgreSQL or MySQL
- Creating a database
- Creating tables
- INSERT queries
- SELECT queries
- UPDATE queries
- DELETE queries
- Joins across tables
- Aggregation functions (COUNT, SUM, AVG)
- Transactions
- Prepared statements (preventing SQL injection)
- Basic query optimization
2Working Example
💻 Example: PostgreSQL / MySQL with Node.js
CREATE TABLE courses (
id SERIAL PRIMARY KEY,
title VARCHAR(255) NOT NULL,
level VARCHAR(50)
);
INSERT INTO courses (title, level) VALUES ('Node.js Master Course', 'Beginner');
SELECT * FROM courses WHERE level = 'Beginner';3Best Practices & Common Pitfalls
💡 Key things to remember:
- Always use prepared statements / parameterized queries ($1, $2 in PostgreSQL or ? in MySQL) — never build SQL strings by concatenating user input, which opens the door to SQL injection.
❓ Frequently Asked Questions (FAQ)
Q What's the most important thing to understand about postgresql / mysql with node.js?
Focus on: Creating Tables · INSERT/SELECT/UPDATE/DELETE · Joins · Prepared Statements. These are the core building blocks this chapter's examples are built around, and they show up repeatedly in later chapters of this course.
Q Do I need external npm packages for postgresql / mysql with node.js?
Only where explicitly shown in the code examples above (like Express, Zod, or Socket.IO) — otherwise, this chapter relies entirely on Node.js's own built-in capabilities.