Connecting Flask to a Database
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Connecting Flask to a Database
Flask is a lightweight Python web framework that makes building web applications simple and flexible. One of the essential steps in most Flask projects is connecting the app to a database for storing and managing data. Flask supports multiple databases, but commonly developers use SQLite, MySQL, or PostgreSQL.
To begin, you need a database driver or ORM (Object Relational Mapper). SQLAlchemy is the most popular ORM with Flask, as it allows developers to interact with databases using Python objects instead of raw SQL queries.
Start by installing SQLAlchemy with:
pip install flask_sqlalchemy
Next, configure the connection in your app.py:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///mydb.db'
db = SQLAlchemy(app)
class User(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(100))
Run db.create_all() to create tables, and you’re ready to perform CRUD operations.
Flask also integrates seamlessly with other databases like MySQL or PostgreSQL by changing the connection string. For example:
mysql+pymysql://username:password@localhost/dbname.
By connecting Flask to a database, you unlock dynamic data handling, user management, and scalability—transforming a simple app into a powerful, production-ready solution.
Read More
Introduction to Flask for Web Development
Handling Forms and Validation in HTML
Vue.js Basics for Python Backends
Introduction to React.js for Python Developers
Integrating jQuery into Flask/Django
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