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

Creating Your First Flask App

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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