Populate TableView using Derby Database - javafx

Question

This is my first time using Derby database and I am having trouble adding information into my tableview.
public class AddController implements Initializable {
final String DB_URL = "jdbc:derby:StudentDB;";
#FXML TableView<Student> studentListView;
#FXML TableColumn stuName;
#FXML TableColumn stuAge;
#FXML TableColumn stuMajor;
#FXML TableColumn stuGPA;
#FXML ComboBox ageCB;
#FXML ComboBox majorCB;
#FXML ComboBox gpaCB;
ObservableList<Student> studentList;
#Override
public void initialize(URL url, ResourceBundle resourceBundle) {
studentList = FXCollections.observableArrayList();
createDB();
createStudentsDB();
studentListView.setItems(studentList);
}
public void createDB(){
try
{
Connection conn = DriverManager.getConnection("jdbc:derby:StudentDB;create=true");
conn.close();
System.out.println("Connection successful");
}
catch(Exception ex)
{
System.out.println("ERROR: " + ex.getMessage());
}
}
public void createStudentsDB(){
try{
Connection conn = DriverManager.getConnection(DB_URL);
Statement stmt = conn.createStatement();
stmt.execute("DROP TABLE Student");
stmt.execute("CREATE TABLE Student (" +
"Name CHAR(25), " +
"Age INT, " +
"Major CHAR(45), " +
"GPA DECIMAL, ");
String sql = "INSERT INTO Student VALUES" +
"('Robert', 21, 'Computer Information Systems', 3.8)";
stmt.executeUpdate(sql);
String sqlStatement = "SELECT Name, Age, Major, GPA FROM Student";
ResultSet result = stmt.executeQuery(sqlStatement);
ObservableList<Student> studentList = FXCollections.observableArrayList();
while (result.next())
{
Student newStudent = new Student();
newStudent.name = result.getString("Name");
newStudent.age = result.getInt("Age");
newStudent.major = result.getString("Major");
newStudent.gpa = result.getDouble("GPA");
studentList.add(newStudent);
}
stmt.close();
conn.close();
}
catch (Exception ex)
{
var msg = ex.getMessage();
System.out.println(msg);
}
}
<TableView fx:id="studentListView" prefWidth="400">
<columns>
<TableColumn fx:id="stuName" text="Student" prefWidth="125"/>
<TableColumn fx:id="stuAge" text="Age" prefWidth="75"/>
<TableColumn fx:id="stuMajor" text="Major" prefWidth="125"/>
<TableColumn fx:id="stuGPA" text="GPA" prefWidth="75"/>
</columns>
</TableView>
I already created a TableView in FXML with the 4 columns I want. I just do not know how to get the information from the database to the TableView.

Answer 1

This code reads from a Derby Database the table is named Parent
We are using a MVC Model View Controller Pattern
And we strongly suggest you use the MVC concept when working with any database
private void ReadFromParent() throws SQLException{
ObservableList<ParentModel> TableData = FXCollections.observableArrayList();
stmnt = conn.createStatement();
ResultSet rs = stmnt.executeQuery("SELECT * FROM Parent");
while (rs.next()){// Add data to observableArrayList TableData to select a table ROW
TableData.add(new ParentModel(rs.getString("PID"),rs.getString("pMonth"),rs.getString("pYear")));
}
PropertyValueFactory<ParentModel, String> IDCellValueFactory = new PropertyValueFactory<>("PID");
colID.setCellValueFactory(IDCellValueFactory);
PropertyValueFactory<ParentModel, String> DateCellValueFactory = new PropertyValueFactory<>("pMonth");
colMonth.setCellValueFactory(DateCellValueFactory);
PropertyValueFactory<ParentModel, String> TypeCellValueFactory = new PropertyValueFactory<>("pYear");
colYear.setCellValueFactory(TypeCellValueFactory);
// ================================================================
// colTxDate are the ID's for the tableview columns
// sortDate are the Column Names for the Database TABLE CDBalance
// ================================================================
colMonth.setStyle("-fx-alignment: CENTER;");
colYear.setStyle("-fx-alignment:CENTER;");
Collections.sort(TableData, (p2, p1)-> p1.getPID().compareToIgnoreCase(p2.getPID()));
// Line of Code above Sorts Database Columns based on VARIABLE in ParentModel
// Change p2,p1 to sort Ascending or Descending
if(TableData.size() < 15) {// Format TableView to display Vertical ScrollBar
ptable.setPrefWidth(336);// 19 is the off set
}else {
ptable.setPrefWidth(355);
} ptable.setItems(TableData);
stmnt.close();
}