# lambda

PV project λ (RDBMS)

## Requirements
1. The solution must have controllable isolation level of transactions and it must showcase the phenomenon of **Non-repeatable reads** or **Phantom reads**
2. Must use a **true relational database** or **object-relational database**
3. The database must consist of **at least 5 tables including junction tables**, **2 views** and **1 M:N relation**
4. The attributes of tables must **use the following data types at least once**
	- Real number (`float`)
	- Logical value (`bool`, ...)
	- `enum`
	- Text string (`varchar`, `text`, ...)
	- Date or time (`date`, `timestamp`, ...)
5. Must allow **creation**, **updates**, **deletion** and **display** of a resource **which splits into more tables** at database level
6. Implement at least one **transaction between at least 2 tables**
7. Ability to **generate reports** which contains **aggregated data** from at least **3 tables**
8. Ability to **import data** to at least **2 tables** in format **`CSV`**, **`XML`** or **`JSON`**
9. Configurability via **configuration file**
10. Proper **error handling** for all edge cases

In addition to these criteria, there are the following extras:
1. 1x Documentation
	- This document must conform to the **[Documentation Checklist](https://moodle.spsejecna.cz/pluginfile.php/2565/mod_resource/content/2/D.13%20Checklist.pdf)**
2. 3x Test cases
	- All test cases are in `PDF` format
	- 1 Test case is for running the app including importing database structure
	- 2 Test cases are for testing the app itself and all possible errors and edge cases and configurability


## Solution
My solution will use the following tech stack:
1. **Python** language
2. **MySQL** for database
3. **PySide6** for user interface made in Qt
4. **SqlAlchemy** for database management
5. **`python-dotenv`** for configurability

The problem in question will be demonstrated on a library application

## Sources
1. [Qt documentation for pyside2](https://doc.qt.io/qtforpython-5/PySide2/QtWidgets)
1. [Qt documentation for PySide6](https://doc.qt.io/qtforpython-6/PySide6/QtWidgets/)
2. [Pythontutorial.net](https://www.pythontutorial.net/pyqt/pyqt-qtoolbar/)
3. [Docs.sqlalchemy.org](https://docs.sqlalchemy.org/)
4. [XSD tutorial](https://www.w3schools.com/xml/schema_intro.asp)