Introduction to Data Management and Export Tools

Key Points

• The data entry phase is now complete, and we need to extract, analyze, and filter the data.
• Export to Excel is a vital feature that makes it easy to export and print data in Excel.

Model-View-Controller (MVC)

• Model: A class or object also known as a Bean Class. It contains properties and their getters/setters.
• Views: UI components to display data.
• Controller: Handles business logic and coordinates between the model and views.

Bean Class

• POJO Class: Plain Old Java Object, a regular Java class.
• A Bean Class has properties, getters, and setters.
• Bean classes are used in many techniques of Spring Boot and Java.

Data Transfer

• A Table View cannot be directly linked to a database; data must first be loaded into memory.
• Data is managed as an Array of Objects.

Export to Excel

• An Array of Objects is used to export table data to Excel.
• Create a function to write data to Excel and loop through the data, writing it to an Excel file.

Code Snippets

• Data Loading and Fetching:

  PreparedStatement ps = connection.prepareStatement("SELECT * FROM table");
  ResultSet rs = ps.executeQuery();
  while (rs.next()) {
    // Load each row into an object and add to list
  }
  

• Export to Excel Code:

  FileWriter excel = new FileWriter("output.xlsx");
  for (Object obj : arrayOfObjects) {
    excel.write(obj.toString());
  }
  excel.close();
  

Other Important Points

• Map the subject with bound columns.
• Add columns to the Table View at runtime.
• Parameterization is essential in constructors and getters/setters.
• Use a default constructor.

Assignment

• Create a form that includes information on workers and customers.
• Use specialization to filter workers.
• Practice loading data from the database and displaying it in a Table View.