I’m trying display severeal lines from a database in NetBeans, but only one line appears

I’m currently having to do a code where, when ran, connects to a database and displays all the grades of a student after putting in their appropriate SSN. The main obstacle I’m running into is that once I put in the SSN it’ll only bring one of the grades rather than all. Is there something wrong with my logic? Am I just utilizing incorrect parts to do this? I’ve tried putting more than one lblstatus but that didn’t work. Here’s the code:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import java.sql.*;

public class Week13 extends Application {

    private TextField tfSSN = new TextField();
    private Label lblStatus = new Label();
    private PreparedStatement preparedStatement;

    @Override 
    public void start(Stage primaryStage) {
        initializeDB();

        Button btShowGrade = new Button("Show Grade");
        HBox hBox = new HBox(5);
        hBox.getChildren().addAll(new Label("SSN"), tfSSN, (btShowGrade));

        VBox vBox = new VBox(10);
        vBox.getChildren().addAll(hBox, lblStatus);

        tfSSN.setPrefColumnCount(6);
        btShowGrade.setOnAction(e -> showGrade());

        Scene scene = new Scene(vBox, 420, 80);
        primaryStage.setTitle("FindGrade"); 
        primaryStage.setScene(scene);  
        primaryStage.show(); 
    }

    private void initializeDB() {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            System.out.println("Driver loaded");

            Connection connection = DriverManager.getConnection("blank for the purpose of posting this");
            System.out.println("Database connected");
            String queryString = "select firstName, mi, lastName, title, grade " 
                + "from Student, Enrollment, Course where Student.ssn = ? and "
                + "Enrollment.ssn = Student.ssn and Enrollment.courseId = "
                + "Course.courseId";
            preparedStatement = connection.prepareStatement(queryString);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

private void showGrade() { 
      String ssn = tfSSN.getText();

 try {
     preparedStatement.setString(1, ssn);
     ResultSet rset = preparedStatement.executeQuery();

 if (rset.next()) { 
          String lastName = rset.getString(1); 
          String mi = rset.getString(2); 
          String firstName = rset.getString(3); 
          String title = rset.getString(4); 
          String grade = rset.getString(5); 

          lblStatus.setText(firstName + " " + mi + 
 " " + lastName + "'s grade on course " + title + " is " + 
            grade); 
        } else { 
          lblStatus.setText("Not found"); 
        } 
      } 
 catch (SQLException ex) { 
        ex.printStackTrace(); 
      }
}
}

Answer

You have used if which is getting executed only once and therefore, you are getting only one record.

Replace

if (rset.next()) { 
    String lastName = rset.getString(1); 
    String mi = rset.getString(2); 
    String firstName = rset.getString(3); 
    String title = rset.getString(4); 
    String grade = rset.getString(5); 

    lblStatus.setText(firstName + " " + mi + 
    " " + lastName + "'s grade on course " + title + " is " + 
    grade); 
} else { 
    lblStatus.setText("Not found"); 
} 

with

StringBuilder s = new StringBuilder();
int c = 0;
while (rset.next()) { 
    String lastName = rset.getString(1); 
    String mi = rset.getString(2); 
    String firstName = rset.getString(3); 
    String title = rset.getString(4); 
    String grade = rset.getString(5); 
    s.append(firstName).append(" ").append(mi).append(" ").append(lastName).append("'s grade on course ").append(title).append(" is ").append(grade).append("n");     
    c++;
}
if(c>0) {
    lblStatus.setText(s.toString());
} else {
    lblStatus.setText("Not found");
}

Note that using while, you create a loop which will keep iterating until the condition, rset.next() remains true i.e. until the resultset has more elements.