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Khamisi Kibet

Khamisi Kibet

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6 Months ago | 137 views

**Course Title:** PySide6 Application Development **Section Title:** Integrating Databases with PySide6 **Topic:** Performing CRUD (Create, Read, Update, Delete) operations ### Overview In this topic, you will learn how to perform basic database operations using QSqlDatabase and QSqlQuery in PySide6. We'll cover how to create, read, update, and delete database records. You'll understand how to use these essential concepts to build a robust and interactive PySide6 application. ### Performing CRUD Operations CRUD operations are fundamental to any database-driven application. These operations enable you to interact with the database by creating new records, reading existing ones, updating existing records, and deleting unnecessary records. #### Create Operation To perform a create operation in PySide6, you can use the `QSqlQuery` class to execute an SQL `INSERT INTO` query. Here's an example: ```python from PySide6.QtSql import QSqlDatabase, QSqlQuery # Connect to the database db = QSqlDatabase.addDatabase('QSQLITE') db.setDatabaseName('database.db') db.open() # Create a QSqlQuery object query = QSqlQuery(db) # Prepare the INSERT INTO query query.prepare('INSERT INTO table_name (column1, column2) VALUES (?, ?)') # Bind the values to the placeholders query.bindValue(0, 'Value 1') query.bindValue(1, 'Value 2') # Execute the query query.exec() # Close the database connection db.close() ``` This code inserts a new record into the `table_name` table with the values `Value 1` and `Value 2`. #### Read Operation To perform a read operation in PySide6, you can use the `QSqlQuery` class to execute an SQL `SELECT` query. Here's an example: ```python from PySide6.QtSql import QSqlDatabase, QSqlQuery # Connect to the database db = QSqlDatabase.addDatabase('QSQLITE') db.setDatabaseName('database.db') db.open() # Create a QSqlQuery object query = QSqlQuery(db) # Prepare the SELECT query query.prepare('SELECT * FROM table_name WHERE column1 = ?') # Bind the value to the placeholder query.bindValue(0, 'Value 1') # Execute the query query.exec() # Fetch the result while query.next(): print(query.value(0), query.value(1)) # Close the database connection db.close() ``` This code selects all records from the `table_name` table where `column1` equals `Value 1` and prints the results. #### Update Operation To perform an update operation in PySide6, you can use the `QSqlQuery` class to execute an SQL `UPDATE` query. Here's an example: ```python from PySide6.QtSql import QSqlDatabase, QSqlQuery # Connect to the database db = QSqlDatabase.addDatabase('QSQLITE') db.setDatabaseName('database.db') db.open() # Create a QSqlQuery object query = QSqlQuery(db) # Prepare the UPDATE query query.prepare('UPDATE table_name SET column2 = ? WHERE column1 = ?') # Bind the values to the placeholders query.bindValue(0, 'New Value 2') query.bindValue(1, 'Value 1') # Execute the query query.exec() # Close the database connection db.close() ``` This code updates the `column2` value to `New Value 2` where `column1` equals `Value 1` in the `table_name` table. #### Delete Operation To perform a delete operation in PySide6, you can use the `QSqlQuery` class to execute an SQL `DELETE` query. Here's an example: ```python from PySide6.QtSql import QSqlDatabase, QSqlQuery # Connect to the database db = QSqlDatabase.addDatabase('QSQLITE') db.setDatabaseName('database.db') db.open() # Create a QSqlQuery object query = QSqlQuery(db) # Prepare the DELETE query query.prepare('DELETE FROM table_name WHERE column1 = ?') # Bind the value to the placeholder query.bindValue(0, 'Value 1') # Execute the query query.exec() # Close the database connection db.close() ``` This code deletes all records from the `table_name` table where `column1` equals `Value 1`. ### Practical Takeaways * Use `QSqlQuery` to execute SQL queries. * Use `QSqlDatabase` to connect to a database. * Use prepared statements to prevent SQL injection. * Use parameter binding to replace placeholders in queries. ### Conclusion In this topic, we covered performing CRUD operations in PySide6. You learned how to create, read, update, and delete database records using the `QSqlQuery` class. You also learned how to use prepared statements and parameter binding to make your database interactions safer and more efficient. ### What's Next In the next topic, you'll learn how to display database data in views using `QTableView`. If you have any questions or need help, leave a comment below.
Course
PySide6
Python
UI Development
Cross-Platform
Animations

PySide6 Database CRUD Operations

Course Title: PySide6 Application Development Section Title: Integrating Databases with PySide6 Topic: Performing CRUD (Create, Read, Update, Delete) operations

Overview

In this topic, you will learn how to perform basic database operations using QSqlDatabase and QSqlQuery in PySide6. We'll cover how to create, read, update, and delete database records. You'll understand how to use these essential concepts to build a robust and interactive PySide6 application.

Performing CRUD Operations

CRUD operations are fundamental to any database-driven application. These operations enable you to interact with the database by creating new records, reading existing ones, updating existing records, and deleting unnecessary records.

Create Operation

To perform a create operation in PySide6, you can use the QSqlQuery class to execute an SQL INSERT INTO query. Here's an example:

from PySide6.QtSql import QSqlDatabase, QSqlQuery

# Connect to the database
db = QSqlDatabase.addDatabase('QSQLITE')
db.setDatabaseName('database.db')
db.open()

# Create a QSqlQuery object
query = QSqlQuery(db)

# Prepare the INSERT INTO query
query.prepare('INSERT INTO table_name (column1, column2) VALUES (?, ?)')

# Bind the values to the placeholders
query.bindValue(0, 'Value 1')
query.bindValue(1, 'Value 2')

# Execute the query
query.exec()

# Close the database connection
db.close()

This code inserts a new record into the table_name table with the values Value 1 and Value 2.

Read Operation

To perform a read operation in PySide6, you can use the QSqlQuery class to execute an SQL SELECT query. Here's an example:

from PySide6.QtSql import QSqlDatabase, QSqlQuery

# Connect to the database
db = QSqlDatabase.addDatabase('QSQLITE')
db.setDatabaseName('database.db')
db.open()

# Create a QSqlQuery object
query = QSqlQuery(db)

# Prepare the SELECT query
query.prepare('SELECT * FROM table_name WHERE column1 = ?')

# Bind the value to the placeholder
query.bindValue(0, 'Value 1')

# Execute the query
query.exec()

# Fetch the result
while query.next():
    print(query.value(0), query.value(1))

# Close the database connection
db.close()

This code selects all records from the table_name table where column1 equals Value 1 and prints the results.

Update Operation

To perform an update operation in PySide6, you can use the QSqlQuery class to execute an SQL UPDATE query. Here's an example:

from PySide6.QtSql import QSqlDatabase, QSqlQuery

# Connect to the database
db = QSqlDatabase.addDatabase('QSQLITE')
db.setDatabaseName('database.db')
db.open()

# Create a QSqlQuery object
query = QSqlQuery(db)

# Prepare the UPDATE query
query.prepare('UPDATE table_name SET column2 = ? WHERE column1 = ?')

# Bind the values to the placeholders
query.bindValue(0, 'New Value 2')
query.bindValue(1, 'Value 1')

# Execute the query
query.exec()

# Close the database connection
db.close()

This code updates the column2 value to New Value 2 where column1 equals Value 1 in the table_name table.

Delete Operation

To perform a delete operation in PySide6, you can use the QSqlQuery class to execute an SQL DELETE query. Here's an example:

from PySide6.QtSql import QSqlDatabase, QSqlQuery

# Connect to the database
db = QSqlDatabase.addDatabase('QSQLITE')
db.setDatabaseName('database.db')
db.open()

# Create a QSqlQuery object
query = QSqlQuery(db)

# Prepare the DELETE query
query.prepare('DELETE FROM table_name WHERE column1 = ?')

# Bind the value to the placeholder
query.bindValue(0, 'Value 1')

# Execute the query
query.exec()

# Close the database connection
db.close()

This code deletes all records from the table_name table where column1 equals Value 1.

Practical Takeaways

  • Use QSqlQuery to execute SQL queries.
  • Use QSqlDatabase to connect to a database.
  • Use prepared statements to prevent SQL injection.
  • Use parameter binding to replace placeholders in queries.

Conclusion

In this topic, we covered performing CRUD operations in PySide6. You learned how to create, read, update, and delete database records using the QSqlQuery class. You also learned how to use prepared statements and parameter binding to make your database interactions safer and more efficient.

What's Next

In the next topic, you'll learn how to display database data in views using QTableView.

If you have any questions or need help, leave a comment below.

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PySide6 Application Development

Course

Objectives

  • Master PySide6 for creating cross-platform desktop applications with a modern, professional UI.
  • Understand the core concepts of Qt and how to use them in Python.
  • Develop applications using widgets, layouts, and advanced UI elements.
  • Implement features like data binding, custom styling, and animations.

Introduction to PySide6 and Qt

  • Overview of PySide6 and Qt: What is it, and why use it for desktop development?
  • Setting up the development environment: Installing PySide6, configuring IDEs
  • Basic PySide6 application structure
  • Understanding event-driven programming
  • Lab: Setting up PySide6 and creating your first simple PySide6 app (Hello World).

Widgets, Layouts, and Events

  • Introduction to basic widgets: QPushButton, QLabel, QLineEdit, etc.
  • Working with layouts: QVBoxLayout, QHBoxLayout, QGridLayout
  • Handling events and signals in PySide6
  • Connecting widgets and signals using slots
  • Lab: Building a basic form with several widgets and handling user input.

Advanced Widgets and Forms

  • Advanced widgets: QComboBox, QListWidget, QTableWidget, QTreeView
  • Customizing forms with QLabel and QLineEdit validators
  • Creating reusable custom widgets
  • Understanding signals and slots in depth
  • Lab: Creating a form with advanced widgets and custom validation.

Building Responsive and Dynamic UIs

  • Designing dynamic UIs that adapt to window resizing
  • Introduction to QStackedWidget and dynamic layouts
  • Using QSplitter and QTabWidget for multi-view interfaces
  • Best practices for responsive design in desktop apps
  • Lab: Building a dynamic, multi-view app with tabs and split views.

Model-View-Controller (MVC) Architecture

  • Introduction to MVC in PySide6
  • Working with models: QAbstractListModel, QAbstractTableModel
  • Data binding between models and views
  • Custom models and proxy models
  • Lab: Building an app with custom list and table models.

Styling and Theming Applications

  • Introduction to Qt Stylesheets (CSS-like theming)
  • Customizing widget appearance with stylesheets
  • Dark mode implementation
  • Dynamic theming (switch between themes at runtime)
  • Lab: Creating a custom-styled app with dark mode and dynamic theming.

Handling Files and User Input

  • Working with QFileDialog for file selection
  • Reading and writing to files with QFile and QTextStream
  • Implementing drag-and-drop functionality
  • Handling keyboard and mouse events
  • Lab: Building an app that allows file selection and file content reading and writing.

Integrating Databases with PySide6

  • Introduction to SQL databases in PySide6
  • Using QSqlDatabase and QSqlQuery for database operations
  • Performing CRUD (Create, Read, Update, Delete) operations
  • Displaying database data in views (QTableView)
  • Lab: Building a simple CRUD app with SQLite and displaying data in a table.

Multithreading and Asynchronous Operations

  • Introduction to multithreading in PySide6
  • Using QThread and QRunnable for background tasks
  • Handling long-running tasks without freezing the UI
  • Asynchronous operations using Qt’s signal-slot mechanism
  • Lab: Building an app that performs background tasks while keeping the UI responsive.

Working with Graphics and Animations

  • Introduction to QGraphicsView and QGraphicsScene
  • Creating custom graphics items and rendering them
  • Implementing animations with QPropertyAnimation and QSequentialAnimationGroup
  • Basic 2D drawing with QPainter
  • Lab: Creating an interactive graphical app with animations and custom drawings.

Deploying PySide6 Applications

  • Packaging PySide6 applications for distribution (PyInstaller, fbs)
  • Cross-platform considerations (Windows, macOS, Linux)
  • Creating installers for your app
  • Best practices for deployment and versioning
  • Lab: Packaging and creating an installer for your PySide6 app using PyInstaller.

Advanced Topics and Final Project Preparation

  • Exploring platform-specific features (system tray, notifications)
  • Introduction to multimedia with PySide6 (audio, video, camera)
  • Understanding QML and how to integrate it with PySide6
  • Final project overview and preparation
  • Lab: Planning and starting the final project based on real-world use cases.

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