restore hello.py

src/hello.py

@@ -0,0 +1,63 @@
+# The QAbstractTableModel class provides an abstract 
+# model that can be subclassed to create table models.
+
+import sys
+from PyQt6.QtWidgets import (QApplication, 
+    QWidget, QHBoxLayout, QTableView)
+from PyQt6.QtCore import Qt, QModelIndex
+from PyQt6.QtSql import QSqlDatabase, QSqlTableModel
+
+class Window(QWidget):
+
+    def __init__(self):
+
+        super().__init__()
+
+        layout = QHBoxLayout()
+        self.setLayout(layout)
+
+        database = QSqlDatabase('QSQLITE')
+        database.setDatabaseName('chinook.db')
+        database.open()
+
+        genres_model = QSqlTableModel(db=database)
+        genres_model.setTable('genres')
+        genres_model.select()
+
+        self.genres_view = QTableView()
+        self.tracks_view = QTableView()
+
+        self.genres_view.setModel(genres_model)
+        self.genres_view.clicked.connect(self.show_tracks)
+
+        layout.addWidget(self.genres_view)
+        layout.addWidget(self.tracks_view)
+
+    def show_tracks(self):
+
+        current_index = self.genres_view.currentIndex()
+        row = current_index.row()
+        record = self.genres_view.model().record(row)
+
+        genre_id = record.field('GenreId').value()
+
+        database = self.genres_view.model().database()
+        tracks_model = QSqlTableModel(db=database)
+        tracks_model.setTable('tracks')
+        tracks_model.setFilter('GenreId = {}'.format(genre_id))
+        tracks_model.select()
+
+        self.tracks_view.setModel(tracks_model)
+
+
+if __name__ == '__main__':
+
+    if not QApplication.instance():
+        app = QApplication(sys.argv)
+    else:
+        app = QApplication.instance()
+
+    main_window = Window()
+    main_window.show()
+
+    sys.exit(app.exec())