Django model class is defined in models.py file in Django application folder, each model class will be mapped to a database table in the project backend database server. After you define the model class, you can create the related table use Django manage.py tasks command, all the low level sql command ( such as table […]
How To Show SQL Query Command In Django Migration Read More »
When we develop Python programs, we always need to install and use a lot of third-party library packages. But if we develop the same Python program on another new machine, we may need to install all those library packages again. This will waste time and even make errors. But PIP has provided a method for
How To Install Python Packages Using Requirements Text File Read More »
When I write and run the Django app models unit test, I meet an error like this django.contrib.auth.models.User.DoesNotExist: User matching query does not exist.
How To Fix User Matching Query Does Not Exist Error In Django Unit Test Read More »
Python unittest library is used to run the unit tests for Python classes and functions. It is a built-in library provided by Python, so you do not need to install any third-party library to use it. This example will demo how to use it to make your unit test more clear and easy. But the
How To Run Unit Test Use External CSV Test Data In Python Read More »
If you find the Django url pattern is not easy to use when you want to pass multiple request parameters via url, you can use the original method to implement it. The original method is to use url like this http://127.0.0.1:8000/dept_emp/emp_list/?dept_id=1&user_name=jerry. It just adds the parameter name and value pair after the question mark (?) of
How To Pass Multiple Parameters Via Url In Django Read More »
We have shown you how to use bootstrap3 and Django to create a beautiful website in the previous article Django Bootstrap3 Example. But that example does not provide two important features, one is searching and the other is search results pagination. This article will add the two features to it. All the source code is
Django Filter And Pagination Example Read More »
Bootstrap is the most popular front-end framework for web page development. It provides a lot of CSS classes and javascript functions for you to make your web page beautiful and consistent. Django is the most popular web framework written in Python. It makes dynamic website creation easy and faster. This example will show you how
Django Bootstrap3 Example Read More »
Each Django project can have multiple applications. Each application can have multiple models and each model has mapped to one table in the backend database. This article will tell you how to create Django project application. How to remove all database table of the application and how to remove the application completely.
How To Create / Remove Django Project Application Read More »
When you want to connect to the MySQL database in Python code, you can use both the mysql-connector-python MySQL driver and PyMySQL. The mysql-connector-python MySQL driver is a MySQL server built-in driver and the PyMySQL is a third-party library. All the two MySQL python libraries provide classes for you to get MySQL database connection, execute insert, delete,
Python Connect To MySQL Database With MySQL Connector & PyMySQL Example Read More »
PyMySQL is a python library that can connect to the MySQL database. But these days when I execute the select SQL command through PyMySQL, I found the execution does not return any records from the database table, but the data really exists in the database table. And when I run the SQL command in the
Pymysql Cursor.fetchall() / Fetchone() Returns None Read More »