sqlite-integration-for-beginners

Development

Add SQLite database to Flask or Sinatra app with beginner-friendly code examples and teaching comments

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SQLite Integration for Beginners

Version: 0.17.0

When to Use

User has app with in-memory storage (lists/arrays)
User asks "How do I save data permanently?"
User wants data to persist after restart

Prerequisites

Working Flask/Sinatra app
Understanding routes and templates
At least one feature using list storage

What is SQLite?

List/Array: Like whiteboard notes - disappears when server stops SQLite: Like notebook - saved to file (notes.db), persists forever

Perfect for beginners:

No server setup
Built into Python
Easy SQL basics
Upgrades to PostgreSQL later

Key Concepts

Database Structure

Table = Spreadsheet
Columns = Data types (id, name, email)
Rows = Data entries

SQL Commands

Command	Purpose
CREATE TABLE	Make new table
INSERT INTO	Add data
SELECT	Get data
UPDATE	Change data
DELETE	Remove data

Implementation

Flask

import sqlite3

def get_db():
    conn = sqlite3.connect('notes.db')
    conn.row_factory = sqlite3.Row
    return conn

def init_db():
    conn = get_db()
    conn.execute('''
        CREATE TABLE IF NOT EXISTS notes (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            text TEXT NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    ''')
    conn.commit()
    conn.close()

@app.route('/')
def home():
    conn = get_db()
    notes = conn.execute('SELECT * FROM notes').fetchall()
    conn.close()
    return render_template('index.html', notes=notes)

Sinatra

require 'sqlite3'
DB = SQLite3::Database.new 'notes.db'
DB.results_as_hash = true

DB.execute <<-SQL
  CREATE TABLE IF NOT EXISTS notes (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    text TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
  )
SQL

get '/' do
  @notes = DB.execute('SELECT * FROM notes')
  erb :index
end

SQL Explanation

CREATE TABLE IF NOT EXISTS: Safe to run multiple times
PRIMARY KEY AUTOINCREMENT: Unique auto-incrementing ID
NOT NULL: Value required
DEFAULT CURRENT_TIMESTAMP: Auto-filled time
? placeholder: Prevents SQL injection

Common Questions

Database location: notes.db in project folder
View inside: DB Browser for SQLite
Mistake? Delete notes.db, it recreates
Ruby install: gem install sqlite3

Troubleshooting

Error	Solution
no such table	Run `init_db()` function
Database locked	Close DB Browser, restart server
no such column	Check spelling in SQL

End of Skill