How to fill up a TableView with database data

Question

I\'ve been trying to load a TableView with data queried from a database, but can\'t seem to get it to work.

This is my first attempt at trying to fill up a database

Answer 1

If Database contains different types of data, not only String, then column type assigning is better to make dynamic:

package sample;

import javafx.application.Application;
import javafx.beans.property.*;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import java.sql.*;
import java.util.ArrayList;
import java.util.TimeZone;

//Author: Yerbol
//SQL database "sqlbase_schema" contains a Table "sqlbase_table" with 3 columns: "id" (Integer(INT(11))), "name" (String(VARCHAR(45))), "married" (Boolean(TINYINT(1)));

public class Main extends Application {
    private TableView tableView = new TableView<>();

    @Override
    public void start(Stage primaryStage) throws SQLException, ClassNotFoundException {
        //Show window
        buildData();
        Parent root = tableView;
        primaryStage.setScene(new Scene(root, 300, 275));
        primaryStage.show();
    }

    public void buildData() throws ClassNotFoundException, SQLException {

        Connection dbConnection;
        //SQL Database connection params
        String dbHost = "localhost";
        String dbPort = "3306";
        String dbUser = "root";
        String dbPassword = "12345";
        String dbName = "sqlbase_schema";
        String dbTableName = "sqlbase_table";
        String select = "SELECT * FROM " + dbTableName;
        String connectionString = "jdbc:mysql://" + dbHost + ":" + dbPort +"/" + dbName+"?useLegacyDatetimeCode=false&&serverTimezone=" + TimeZone.getDefault().getID();
        Class.forName("com.mysql.cj.jdbc.Driver");

        //Connecting to Database
        dbConnection = DriverManager.getConnection(connectionString, dbUser, dbPassword);

        //Extracting data from Databasee
        ResultSet resultSet = null;
        try {
            PreparedStatement preparedStatement = dbConnection.prepareStatement(select);
            resultSet = preparedStatement.executeQuery();

        } catch (SQLException e) {
            e.printStackTrace();
        }

        ObservableList dbData = FXCollections.observableArrayList(dataBaseArrayList(resultSet));

        //Giving readable names to columns
        for(int i=0 ; i();
            switch (resultSet.getMetaData().getColumnName(i+1)) {
                case "id":
                    column.setText("ID #");
                    break;
                case "name":
                    column.setText("Person Name");
                    break;
                case "married":
                    column.setText("Marital Status");
                    break;
                default: column.setText(resultSet.getMetaData().getColumnName(i+1)); //if column name in SQL Database is not found, then TableView column receive SQL Database current column name (not readable)
                    break;
            }
            column.setCellValueFactory(new PropertyValueFactory<>(resultSet.getMetaData().getColumnName(i+1))); //Setting cell property value to correct variable from Person class.
            tableView.getColumns().add(column);
        }

        //Filling up tableView with data
        tableView.setItems(dbData);
    }

    public class Person {

        IntegerProperty id = new SimpleIntegerProperty(); //variable names should be exactly as column names in SQL Database Table. In case if you want to use  type instead of , then you need to use getter/setter procedures instead of xxxProperty() below
        StringProperty name = new SimpleStringProperty();
        BooleanProperty married = new SimpleBooleanProperty();

        public IntegerProperty idProperty() { //name should be exactly like this [IntegerProperty variable name (id) + (Property) = idProperty] (case sensitive)
            return id;
        }

        public StringProperty nameProperty() {
            return name;
        }

        public BooleanProperty marriedProperty() {
            return married;
        }

        public Person(int idValue, String nameValue, boolean marriedValue) {
            id.set(idValue);
            name.set(nameValue);
            married.set(marriedValue);
        }

        Person(){}
    }

    //extracting data from ResulSet to ArrayList
    private ArrayList dataBaseArrayList(ResultSet resultSet) throws SQLException {
        ArrayList data =  new ArrayList<>();
        while (resultSet.next()) {
            Person person = new Person();
            person.id.set(resultSet.getInt("id"));
            person.name.set(resultSet.getString("name"));
            person.married.set(resultSet.getBoolean("married"));
            data.add(person);
        }
        return data;
    }

    public static void main(String[] args) {
        launch(args);
    }
}

In this example SQL database "sqlbase_schema" contains a Table "sqlbase_table" with 3 columns: "id" (Integer(INT(11))), "name" (String(VARCHAR(45))), "married (Boolean(TINYINT(1)));