README.md

Covid-19 Overview

Description

'Covid-19 Overview' is a Python Flask student project for "Internet Technologies" course of department of Informatics - Ionian University, made by Pashalis Grivas and Nemanja Jevtić. The main goal of this project is to demonstrate the usage of Flask web framework by building a simple application/website with an interesting topic - Covid-19 virus.

The app fetches " COVID-19 cases worldwide " (JSON) dataset with Covid-19 data from EU Open Data Portal.

---

User is able to:

• watch global total cases and deaths (until current day)
• track total cases and deaths by continent (until current day)
• be informed about total cases and deaths of all countries (until current day)
• track cases and deaths for a specific country between two dates
• compare cases and deaths of two countries between two dates
• see the top N countries with the most cases/deaths for a specific N (until current day)
• watch the virus spread percentage per country (until current day).

All options are either visualized with tables or charts or both.

---

How to run - Instructions

1. Run git clone (url of the repository) into a directory in order to download the project.

2. Install python dependencies (Install Python 3 if you haven't)

   • pip3 install Flask (just pip on Windows)
   • pip3 install mysql-connector-python
   • pip3 install requests

3. Create a user account in your mysql server with: (use xampp with phpadmin or install mysql on your system)

   • username: user1
   • password: user1
   • host name (local): localhost
   • all data & structure rights

   Or change the host, user and passwd arguments in 'create_database.py' and 'json_to_database.py' files to match your server credentials.

   Follow the insturctions below of how to create a new user (linux)

4. Start your mysql server. (if you already haven't)

5. Run the 'main.py' with:

   • python3 main.py command (it takes a while the first time...)

6. Open site with your browser using the following address:

   • http://127.0.0.1:5000/

Notes:

• Html date input is not supported in Safari or Internet Explorer 11 (or earlier).

• FIX ERROR (if raised):

  • "SELECT list is not in GROUP BY clause and contains nonaggregated column … incompatible with sql_mode=only_full_group_by"

  by running: SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY','')); command on your mysql server.

---

How to create a new user on mysql server - Linux

1. Connect to mysql as root:

   • sudo mysql -h localhost -u root

2. Create user running:

   • mysql> CREATE USER 'user1'@'localhost' IDENTIFIED BY 'user1';

3. If ERROR 1819 (HY000) run:

   • mysql> SET GLOBAL validate_password_policy=LOW;

   and run again step 2.

   Remember to reset this value after you're done.

4. Give privileges to the user:

   • mysql> GRANT ALL PRIVILEGES ON * . * TO 'user1'@'localhost';

5. Run:

   • mysql> FLUSH PRIVILAGES;

   to reload privileges.

6. Log out:

   • mysql> quit

7. Connect as the new user (test):

   • mysql -u user1 -p user1

---

Database schema