Deep Dive: Building a Universal REST API Backend with B4J

Описание: In this episode, we break down the inner workings of SERVERRestApi, a robust and flexible backend class designed to handle database operations via HTTP.

Whether you are building a mobile app or a web dashboard, this code provides a dynamic interface to your MySQL or SQLite databases.

We explore how this single class manages to route traffic and execute SQL safely without writing separate code for every table.

Key Topics Covered:
• Dynamic Routing: How the server parses URLs like /api/records/{table} to automatically target the correct database tables.
• The Big 4 (CRUD): A look at the logic behind handling GET (Read), POST (Insert), PUT (Update), and DELETE operations.
• Advanced Filtering & Paging: How the API parses complex query parameters to filter results (e.g., filter=col,eq,val) and handle pagination with page and size arguments.
• Batch Power: analyzing the logic that allows developers to insert, update, or delete multiple records in a single HTTP request using database transactions.
• Security & Safety: We review the security implementation, including API Key verification, "Safe Identifier" checks to prevent SQL injection on table names, and the specific blocking of dangerous keywords (like DROP or DELETE) in custom queries.
• Raw SQL Endpoint: A look at the specialized /api/query endpoint that allows for safe, raw SELECT statements via JSON payloads.

Join us to learn how to structure a reusable API class that handles CORS, JSON parsing, and error handling automatically!