Setting up Inserting into Many to Many Database with Python SQLALchemy Sqlite смотреть онлайн

Setting up a Many-to-Many Database with Python, SQLAlchemy, and SQLite
In this tutorial, we'll explore how to set up a many-to-many database relationship using Python, SQLAlchemy, and SQLite. Many-to-many relationships are common in relational databases, and SQLAlchemy makes it easy to create and manage them.
We'll go through the following steps:
Let's get started.
Before you begin, make sure you have Python installed on your system. Additionally, you'll need to install SQLAlchemy, a powerful Object-Relational Mapping (ORM) library, using pip:
In this example, let's consider a scenario where we have two entities: Student and Course. A student can enroll in multiple courses, and a course can have multiple students. This creates a many-to-many relationship. To represent this in code, you can define the data models as follows:
In the above code:
To create the database and tables, use the following code:
This code creates an SQLite database called mydatabase.db and generates the necessary tables based on our data models.
Now, let's insert data into our many-to-many database. Here's an example of how to do it:
In this code, we create a session to interact with the database, add students and courses, and enroll students in courses by appending them to the courses relationship. Finally, we commit the changes to the database.
You can query the data using SQLAlchemy. Here are some examples: