Why is My GUI Display Inconsistent and How Can I Update the Table After Deletion?

AbstractTableModel GUI display issue

In the provided Java code for creating a GUI using AbstractTableModel, there are a few issues related to the display and functionality of the second GUI window (Gui2 class).

First Issue: Inconsistent GUI appearance

You mentioned that the Gui2 window appears in two different ways, one with an empty panel and the other with the table and buttons. This inconsistent behavior is typically caused by incorrect initialization or display of the GUI components.

In the constructor of the Gui2 class, the panel is created, and the layout and constraints are defined, but the components (text field, buttons, and table) are not added to the panel. To fix this, you need to add the components to the panel using the add() method or by calling specific methods for each component type.

Second Issue: Table update after deletion

The ActionListener for the "Delete Selected Row" button triggers the deletion query and displays a success message, but the table does not automatically update to reflect the deletion. This issue is related to the way the table model is updated.

When you delete a row from the database, you need to update the underlying table model to remove the deleted row from the data structure. AbstractTableModel provides a method called fireTableRowsDeleted() specifically for this purpose.

To resolve the issue, you should add a line after the successful deletion in the ActionListener of the delete button to call fireTableRowsDeleted(). This will notify the JTable that the data has changed, and it will update the display accordingly.

Additional Considerations:

• The SwingWorker class is used to retrieve rows from the ResultSet in the background, optimizing the display of large datasets.
• The JDBCWorker class, nested within JDBCModel, processes the rows in the SwingWorker and updates the table model using the publish() and process() methods.
• Row metadata is extracted using ResultSetMetaData to determine the number of columns and column names.
• The getPreferredScrollableViewportSize() method is overridden to customize the size of the enclosing JScrollPane.
• The progress property of the SwingWorker is used to display progress during data retrieval.

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