How to Create a Database in Python – SQLAlchemy

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Want to learn how to create a database in Python in the best way? Learn how to do it with SQLAlchemy, without having to write SQL commands.

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How to Create a Database in Python – SQLAlchemy
SQLAlchemy is one of the best options for integrating Python with SQL databases! It is an extremely useful and practical library for those who need to create a database in Python quickly and efficiently.

In this post you will find detailed information about what SQLAlchemy is, how to configure it and use it to create databases, tables and perform CRUD operations (Create, Read, Update and Delete data).

Do you want to learn how to do all this in a simple way, without needing to master SQL commands? Then download the available material and come with me!

What is SQLAlchemy?
SQLAlchemy is an object-relational mapping (ORM) library for Python that allows interaction with SQL databases in a simplified and efficient way.

With SQLAlchemy, you can create, edit, and manipulate databases using Python objects, making it easy to integrate and manage data without having to write SQL commands directly.

Learn more: SQLAlchemy Documentation

SQLAlchemy Installation
The first step to using SQLAlchemy is to install it. To do this, run the following command in your code editor terminal: pip install SQLAlchemy

After installation, the library will be available for you to create and manipulate SQL databases, whether local or remote.

Creating the Database
SQLAlchemy uses the concept of an engine to connect to a database, either to create it or to connect to an existing database. To do this, we will use the create_engine function .

Let's create a variable called db to represent our database. This variable will store the instance of the database created by the create_engine function , which in this example will be an SQLite database called mydatabase.db .

SQLAlchemy supports different types of databases, such as PostgreSQL, MySQL, among others. To use them, you need to have the appropriate drivers installed and adapt the connection string to the corresponding format.

If you are dealing with an online database, the connection string should include all the information needed to log in, providing direct access.

Creating Sessions in the Database
To interact with the database, you need to create a session. The session is used to send and confirm changes made, such as creating, reading, updating, and deleting data. To create a session, we use the sessionmaker function .

The process is simple and requires only two steps: first, we instantiate the sessionmaker, passing the database connection to the bind parameter ; then, we load the created session into a variable, which we will call session .

This is the standard format for creating sessions in SQLAlchemy, allowing all database operations to be managed efficiently and securely.