Tag Archives: sqlite

Python: A Simple Step-by-Step SQLite Tutorial

SQLite is a self-contained, server-less, config-free transactional SQL database engine. Python gained the sqlite3 module all the way back in version 2.5 which means that you can create SQLite database with any current Python without downloading any additional dependencies. Mozilla uses SQLite databases for its popular Firefox browser to store bookmarks and other various pieces of information. In this article you will learn the following:

  • How to create a SQLite database
  • How to insert data into a table
  • How to edit the data
  • How to delete the data
  • Basic SQL queries

This article will be similar in function to the recent SQLAlchemy tutorial that appeared on this site earlier this month. If you want to inspect your database visually, you can use the SQLite Manager plugin for Firefox or if you like the command line, you can use SQLite’s command line shell Continue reading Python: A Simple Step-by-Step SQLite Tutorial

A Simple SqlAlchemy 0.7 / 0.8 Tutorial

A couple years ago I wrote a rather flawed tutorial about SQLAlchemy. I decided it was about time for me to re-do that tutorial from scratch and hopefully do a better job of it this time around. Since I’m a music nut, we’ll be creating a simple database to store album information. A database isn’t a database without some relationships, so we’ll create two tables and connect them. Here are a few other things we’ll be learning:

  • Adding data to each table
  • Modifying data
  • Deleting data
  • Basic queries

Continue reading A Simple SqlAlchemy 0.7 / 0.8 Tutorial

SqlAlchemy: A Simple Tutorial for Elixir

Elixir is a lightweight declarative layer on top of SqlAlchemy that’s been around since 2006, well before SqlAlchemy released their own built-in Declarative syntax. Elixir was created by a collaboration between Jonathan LaCour, Daniel Haus and Gaëtan de Menten who had a passion for making SqlAlchemy even easier to use. In this tutorial, we’ll look at how to to create our own database with Elixir and how to communicate with a pre-existing database. Continue reading SqlAlchemy: A Simple Tutorial for Elixir

SqlAlchemy: Connecting to pre-existing databases

Accessing databases with Python is a simple process. Python even provides a sqlite database library that’s built into the main distribution (since 2.5). My favorite way to access databases with Python is to use the 3rd party package, SqlAlchemy. SqlAlchemy is an object-relational mapper (ORM), which means that it takes SQL constructs and makes them more like the target language. In this case, you end up using Python syntax to execute SQL rather than straight SQL and you can use the same code to access multiple database backends (if you’re careful).

In this article, we’re going to look at how to use SqlAlchemy to connect to pre-existing databases. If my experience is any indication, you’ll probably be spending more time working with databases that you didn’t create than with ones that you did. This article will show you how to connect to them. Continue reading SqlAlchemy: Connecting to pre-existing databases