How To Display Data From Mysql Database In A Javafx Tableview
How To Display Data From Mysql Database In A Javafx Tableview
Here is an explanation of the code above:
- The
Main
class extends theApplication
class and overrides thestart
method. This is the entry point for a JavaFX application. - A
TableView
object is created and threeTableColumn
objects are created for theEmployee ID
,First Name
, andLast Name
fields. - The
cellValueFactory
property of eachTableColumn
is set using thePropertyValueFactory
class. This specifies the field in theEmployee
class that should be displayed in the column. - The columns are added to the
TableView
using thegetColumns().addAll()
method. - An
ObservableList
object is created to store the data for theTableView
. TheloadData
method is called to load the data from the database and add it to theObservableList
. - The
setItems
method is used to set the data for theTableView
. - The
TableView
is added to aStackPane
layout and the layout is added to aScene
. The scene is displayed in theStage
. - The
loadData
method connects to the MySQL database using the JDBC driver, executes aSELECT
statement to retrieve the data from theEmployees
table, and iterates through theResultSet
creating anEmployee
object for each row. TheEmployee
objects are added to theObservableList
. - The
Employee
class is a simple Java class with fields for theEmployee ID
,First Name
, andLast Name
. It also has getter and setter methods for these fields.
To display the rows of the Employees
table in a JavaFX TableView
with each column representing a different field, you can use the following code:
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql. Statement;
public class Main extends Application {
private ObservableList<Employee> data;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
// Create the TableView
TableView<Employee> table = new TableView<>();
// Create the columns
TableColumn<Employee, String> idColumn = new TableColumn<>("Employee ID");
idColumn.setCellValueFactory(new PropertyValueFactory<>("id"));
TableColumn<Employee, String> firstNameColumn = new TableColumn<>("First Name");
firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));
TableColumn<Employee, String> lastNameColumn = new TableColumn<>("Last Name");
lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));
// Add the columns to the TableView
table.getColumns().addAll(idColumn, firstNameColumn, lastNameColumn);
// Load the data from the database
data = FXCollections.observableArrayList();
loadData();
// Set the items in the TableView
table.setItems(data);
// Add the TableView to the scene
StackPane root = new StackPane();
root.getChildren().add(table);
Scene scene = new Scene(root, 600, 400);
stage.setScene(scene);
stage.show();
}
private void loadData() {
try {
// Connect to the database
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/testdb", "username", "password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM Employees");
// Iterate through the ResultSet and create Employee objects for each row
while (rs.next()) {
int id = rs.getInt("EmployeeID");
String firstName = rs.getString("FirstName");
String lastName = rs.getString("LastName");
data.add(new Employee(id, firstName, lastName));
}
// Close the connection
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
Here is the Employee
class that is used in the code above:
public class Employee {
private final SimpleStringProperty id;
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
public Employee(int id, String firstName, String lastName) {
this.id = new SimpleStringProperty(Integer.toString(id));
this.firstName = new SimpleStringProperty(firstName);
this.lastName = new SimpleStringProperty(lastName);
}
public String getId() {
return id.get();
}
public void setId(String id) {
this.id.set(id);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String firstName) {
this.firstName.set(firstName);
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String lastName) {
this.lastName.set(lastName);
}
}
This class has three fields: id
, firstName
, and lastName
. Each field is represented by a SimpleStringProperty
object, which is a JavaFX class that allows the field to be observed by other objects. The class also has getter and setter methods for each field.
The Employee
class is used to represent each row of data in the Employees
table. The PropertyValueFactory
class in the TableColumn
objects uses the getter methods to access the values for each field in the Employee
objects.
You will need to add the mysql-connector-java
library to your project in order to use the JDBC driver. You can do this by adding the following dependency to your build file (e.g., pom.xml
if you are using Maven):
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.22</version>
</dependency>
Alternatively, you can download the library from the MySQL website and add it to your classpath manually.
Here is an example of the Employees
table in MySQL:
+------------+------------+----------+
| EmployeeID | FirstName | LastName |
+------------+------------+----------+
| 1 | John | Smith |
| 2 | Jane | Doe |
| 3 | Bob | Johnson |
+------------+------------+----------+
This table has three columns: EmployeeID
, FirstName
, and LastName
. Each row represents a different employee, with their unique EmployeeID
and their first and last names.
You can use the following SQL statement to create this table in a MySQL database:
CREATE TABLE Employees (
EmployeeID INT PRIMARY KEY,
FirstName VARCHAR(255),
LastName VARCHAR(255)
);
You can then use INSERT
statements to add rows to the table:
INSERT INTO Employees (EmployeeID, FirstName, LastName) VALUES (1, 'John', 'Smith');
INSERT INTO Employees (EmployeeID, FirstName, LastName) VALUES (2, 'Jane', 'Doe');
INSERT INTO Employees (EmployeeID, FirstName, LastName) VALUES (3, 'Bob', 'Johnson');
Certainly! Here is an alternative implementation of the Employee
class that does not use SimpleStringProperty
:
public class Employee {
private int id;
private String firstName;
private String lastName;
public Employee(int id, String firstName, String lastName) {
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
In this version of the Employee
class, the fields are simply represented as primitive types or String
objects. The getter and setter methods are also more straightforward.
To use this version of the Employee
class with the TableView
, you will need to make a few changes to the code:
- Change the type parameter of the
TableView
andTableColumn
objects toEmployee
:
TableView<Employee> table = new TableView<>();
TableColumn<Employee, Integer> idColumn = new TableColumn<>("Employee ID");
TableColumn<Employee, String> firstNameColumn = new TableColumn<>("First Name");
TableColumn<Employee, String> lastNameColumn = new TableColumn<>("Last Name");
- Change the
cellValueFactory
for eachTableColumn
to use the appropriate getter method:
idColumn.setCellValueFactory(new PropertyValueFactory<>("id"));
firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));
lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));
Here is the complete code for displaying data from a MySQL database in a JavaFX TableView
using the Employee
class represented as primitive types without using SimpleStringProperty
:
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Main extends Application {
private ObservableList<Employee> data;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
// Create the TableView
TableView<Employee> table = new TableView<>();
// Create the columns
TableColumn<Employee, Integer> idColumn = new TableColumn<>("Employee ID");
idColumn.setCellValueFactory(new PropertyValueFactory<>("id"));
TableColumn<Employee, String> firstNameColumn = new TableColumn<>("First Name");
firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));
TableColumn<Employee, String> lastNameColumn = new TableColumn<>("Last Name");
lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));
// Add the columns to the TableView
table.getColumns().addAll(idColumn, firstNameColumn, lastNameColumn);
// Load the data from the database
data = FXCollections.observableArrayList();
loadData();
// Set the items in the TableView
table.setItems(data);
Here is an explanation of the code above:
- The
Main
class extends theApplication
class and overrides thestart
method. This is the entry point for a JavaFX application. - A
TableView
object is created and threeTableColumn
objects are created for theEmployee ID
,First Name
, andLast Name
fields. - The
cellValueFactory
property of eachTableColumn
is set using thePropertyValueFactory
class. This specifies the field in theEmployee
class that should be displayed in the column. - The columns are added to the
TableView
using thegetColumns().addAll()
method. - An
ObservableList
object is created to store the data for theTableView
. TheloadData
method is called to load the data from the database and add it to theObservableList
. - The
setItems
method is used to set the data for theTableView
. - The
TableView
is added to aStackPane
layout and the layout is added to aScene
. The scene is displayed in theStage
. - The
loadData
method connects to the MySQL database using the JDBC driver, executes aSELECT
statement to retrieve the data from theEmployees
table, and iterates through theResultSet
creating anEmployee
object for each row. TheEmployee
objects are added to theObservableList
. - The
Employee
class is a simple Java class with fields for theEmployee ID
,First Name
, andLast Name
. It also has getter and setter methods for these fields. In this version of the class, the fields are represented as primitive types orString
objects instead ofSimpleStringProperty
objects.
Here is the complete code for displaying data from a MySQL database in a JavaFX TableView
using the Employee
class represented as primitive types without using SimpleStringProperty
:
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Main extends Application {
private ObservableList<Employee> data;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
// Create the TableView
TableView<Employee> table = new TableView<>();
// Create the columns
TableColumn<Employee, Integer> idColumn = new TableColumn<>("Employee ID");
idColumn.setCellValueFactory(new PropertyValueFactory<>("id"));
TableColumn<Employee, String> firstNameColumn = new TableColumn<>("First Name");
firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));
TableColumn<Employee, String> lastNameColumn = new TableColumn<>("Last Name");
lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));
// Add the columns to the TableView
table.getColumns().addAll(idColumn, firstNameColumn, lastNameColumn);
// Load the data from the database
data = FXCollections.observableArrayList();
loadData();
// Set the items in the TableView
table.setItems(data);
// Add the TableView to the scene
StackPane root = new StackPane();
root.getChildren().add(table);
Scene scene = new Scene(root, 600, 400);
stage.setScene(scene);
stage.show();
}
private void loadData() {
try {
// Connect to the database
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/testdb", "username", "password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM Employees");
// Iterate through the ResultSet and create Employee objects for each row
while (rs.next()) {
int id = rs.getInt("EmployeeID");
String firstName = rs.getString("FirstName");
String lastName = rs.getString("LastName");
data.add(new Employee(id, firstName, lastName));
}
// Close the connection
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}