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Скачать или смотреть How to Create a Database Table with SQLite and SQLAlchemy

  • vlogize
  • 2025-09-29
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How to Create a Database Table with SQLite and SQLAlchemy
How to create db table with SQLite / SQLAlchemy?pythonsqliteflasksqlalchemyflask sqlalchemy
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Описание к видео How to Create a Database Table with SQLite and SQLAlchemy

Discover how to easily create a database table using `SQLAlchemy` and `SQLite` in Python, and fix common errors you might encounter along the way.
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This video is based on the question https://stackoverflow.com/q/63706539/ asked by the user 'marcello86' ( https://stackoverflow.com/u/14156673/ ) and on the answer https://stackoverflow.com/a/63706883/ provided by the user 'ANISH KUMAR MOURYA' ( https://stackoverflow.com/u/7889479/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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How to Create a Database Table with SQLite and SQLAlchemy

Creating a database table in SQLite using SQLAlchemy can be a straightforward process, but sometimes errors can arise that can leave you scratching your head. One common issue is receiving an error message about a column that doesn’t seem to exist, even though it should. In this guide, we will walk through how to define a database table, create it, and troubleshoot the “no column named” error message.

Understanding the Problem

When working with SQLAlchemy and SQLite, you might encounter the following error when attempting to insert a record into your table:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that the SQLAlchemy layer is not able to recognize the pwd column in your table, which could result from a few different scenarios, such as the table not being defined properly or changes not being applied appropriately.

Setting Up Your Flask Application with SQLAlchemy

To create a table in a Flask application using SQLAlchemy, follow these steps:

1. Initialize Your Flask App

Start by setting up your Flask application and importing the necessary modules:

[[See Video to Reveal this Text or Code Snippet]]

2. Configure Your SQLite Database

Specify the SQLite database URI in your application configuration:

[[See Video to Reveal this Text or Code Snippet]]

3. Initialize Extensions

Initialize SQLAlchemy and Bcrypt within your application:

[[See Video to Reveal this Text or Code Snippet]]

4. Define Your Table Metadata

Define the metadata and the structure of your table. Here’s where you define each column:

[[See Video to Reveal this Text or Code Snippet]]

5. Create the Table

You need to create the table in the SQLite database with the following command:

[[See Video to Reveal this Text or Code Snippet]]

6. Define Your User Model

Next, create a class for your user that extends db.Model. Ensure to include the correct table name and column definitions:

[[See Video to Reveal this Text or Code Snippet]]

7. Inserting Data into the Database

After defining your model, you can create a new user and insert it into the database:

[[See Video to Reveal this Text or Code Snippet]]

Resolving the “No Column Named” Error

If you encounter the “no column named pwd” error, ensure the following:

Database Schema: Confirm that your database schema matches your model definitions. If you've updated your model but haven’t reflected those changes in the database, you’ll experience this error.

Table Exists: Make sure the table has been created correctly. You can check your SQLite database using a GUI tool or command line to inspect its structure.

Recreate Tables: If necessary, you may need to drop the existing table and recreate it. This can be done manually in your SQLite database or by using SQLAlchemy's drop_all() method before calling create_all(), but proceed with caution as this will delete existing data.

Conclusion

Creating a database table with SQLite and SQLAlchemy involves several straightforward steps, but it's important to ensure everything is defined and created correctly. If you run into issues like the “no column named” error, check your table schema and make sure that your database reflects the current state of your models. Happy coding!

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