Solve exercise 29.3 - Address Book Modification: Delete an Existing

Entry

src/META-INF/persistence.xml

@@ -8,6 +8,7 @@
 		transaction-type="RESOURCE_LOCAL">
 		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
 		<class>ch29.ex29_02.Addresses</class>
+
 		<properties>
 			<property name="javax.persistence.jdbc.driver"
 				value="com.mysql.jdbc.Driver" />
@@ -24,5 +25,4 @@
 			<property name="hibernate.hbm2ddl.auto" value="update" />
 		</properties>
 	</persistence-unit>
-
 </persistence>

src/ch29/ex29_02/Addresses.java

@@ -30,20 +30,25 @@
 public class Addresses implements Serializable {
 
 	private static final long serialVersionUID = 1L;
+
 	@Id
 	@GeneratedValue(strategy = GenerationType.IDENTITY)
 	@Basic(optional = false)
 	@Column(name = "ADDRESSID")
 	private Integer addressid;
+
 	@Basic(optional = false)
 	@Column(name = "FIRSTNAME")
 	private String firstname;
+
 	@Basic(optional = false)
 	@Column(name = "LASTNAME")
 	private String lastname;
+
 	@Basic(optional = false)
 	@Column(name = "EMAIL")
 	private String email;
+
 	@Basic(optional = false)
 	@Column(name = "PHONENUMBER")
 	private String phonenumber;

src/ch29/ex29_03/AddressBook.fxml

@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.ListView?>
+<?import javafx.scene.control.Separator?>
+<?import javafx.scene.control.TextField?>
+<?import javafx.scene.control.ToolBar?>
+<?import javafx.scene.layout.BorderPane?>
+<?import javafx.scene.layout.ColumnConstraints?>
+<?import javafx.scene.layout.GridPane?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.RowConstraints?>
+<?import javafx.scene.layout.VBox?>
+
+<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="200.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ch29.ex29_03.AddressBookController">
+	<bottom>
+		<ToolBar prefHeight="40.0" prefWidth="200.0" BorderPane.alignment="CENTER">
+			<items>
+				<Label text="Find by last name:" />
+				<TextField fx:id="findByLastNameTextField" />
+				<Button mnemonicParsing="false" onAction="#findButtonPressed" text="Find" />
+				<Separator orientation="VERTICAL" />
+				<Button mnemonicParsing="false" onAction="#browseAllButtonPressed" text="Browse All" />
+			</items>
+		</ToolBar>
+	</bottom>
+	<left>
+		<ListView fx:id="listView" prefWidth="160.0" BorderPane.alignment="CENTER" />
+	</left>
+	<center>
+		<VBox prefHeight="200.0" prefWidth="100.0" BorderPane.alignment="CENTER">
+			<children>
+				<GridPane alignment="CENTER" hgap="8.0" vgap="8.0">
+					<columnConstraints>
+						<ColumnConstraints halignment="RIGHT" hgrow="SOMETIMES" />
+						<ColumnConstraints hgrow="SOMETIMES" />
+					</columnConstraints>
+					<rowConstraints>
+						<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
+						<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
+						<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
+						<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
+						<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+					</rowConstraints>
+					<children>
+						<Label text="First name:" />
+						<Label text="Last name:" GridPane.rowIndex="1" />
+						<Label text="Email:" GridPane.rowIndex="2" />
+						<Label text="Phone:" GridPane.rowIndex="3" />
+						<TextField fx:id="firstNameTextField" prefColumnCount="25" GridPane.columnIndex="1" />
+						<TextField fx:id="lastNameTextField" maxWidth="1.7976931348623157E308" prefColumnCount="25" GridPane.columnIndex="1" GridPane.rowIndex="1" />
+						<TextField fx:id="emailTextField" maxWidth="1.7976931348623157E308" prefColumnCount="25" GridPane.columnIndex="1" GridPane.rowIndex="2" />
+						<TextField fx:id="phoneTextField" maxWidth="1.7976931348623157E308" prefColumnCount="25" GridPane.columnIndex="1" GridPane.rowIndex="3" />
+						<HBox alignment="CENTER_RIGHT" prefHeight="100.0" prefWidth="200.0" spacing="8.0" GridPane.columnIndex="1" GridPane.rowIndex="4">
+							<children>
+                        <Button mnemonicParsing="false" onAction="#clearSelectionButtonPressed" text="Clear" />
+                        <Button mnemonicParsing="false" onAction="#deleteEntryButtonPressed" text="Delete Entry" />
+								<Button mnemonicParsing="false" onAction="#updateEntryButtonPressed" text="Update Entry" />
+								<Button mnemonicParsing="false" onAction="#addEntryButtonPressed" text="Add Entry" />
+							</children>
+						</HBox>
+					</children>
+					<VBox.margin>
+						<Insets bottom="8.0" left="8.0" right="8.0" top="8.0" />
+					</VBox.margin>
+				</GridPane>
+			</children>
+		</VBox>
+	</center>
+</BorderPane>

src/ch29/ex29_03/AddressBook.java

@@ -0,0 +1,26 @@
+// Main application class that loads and displays the AddressBook's GUI.
+
+package ch29.ex29_03;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+public class AddressBook extends Application {
+   @Override
+   public void start(Stage stage) throws Exception {
+      Parent root = 
+         FXMLLoader.load(getClass().getResource("AddressBook.fxml"));
+
+      Scene scene = new Scene(root);
+      stage.setTitle("Address Book");
+      stage.setScene(scene);
+      stage.show();
+   }
+
+   public static void main(String[] args) {
+      launch(args);
+   }
+}

src/ch29/ex29_03/AddressBookController.java

@@ -0,0 +1,214 @@
+// Fig. 29.4: AddressBookController.java
+// Controller for a simple address book
+
+package ch29.ex29_03;
+
+import java.util.List;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Alert.AlertType;
+import javafx.scene.control.ListView;
+import javafx.scene.control.TextField;
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+import javax.persistence.TypedQuery;
+
+import ch29.ex29_02.Addresses;
+
+public class AddressBookController {
+	@FXML
+	private ListView<Addresses> listView;
+	@FXML
+	private TextField firstNameTextField;
+	@FXML
+	private TextField lastNameTextField;
+	@FXML
+	private TextField emailTextField;
+	@FXML
+	private TextField phoneTextField;
+	@FXML
+	private TextField findByLastNameTextField;
+
+	// create an EntityManagerFactory for the persistence unit
+	private final EntityManagerFactory entityManagerFactory = 
+			Persistence.createEntityManagerFactory("AddressBookPU");
+
+	// create an EntityManager for interacting with the persistence unit
+	private final EntityManager entityManager = 
+			entityManagerFactory.createEntityManager();
+
+	// stores list of Addresses objects that results from a database query
+	private final ObservableList<Addresses> contactList = 
+			FXCollections.observableArrayList();
+
+	// populate listView and set up listener for selection events
+	public void initialize() {
+		listView.setItems(contactList); // bind to contactsList
+
+		// when ListView selection changes, display selected person's data
+		listView.getSelectionModel().selectedItemProperty().addListener(
+				(observableValue, oldValue, newValue) -> {
+					displayContact(newValue);
+				});
+		getAllEntries(); // populates contactList, which updates listView
+	}
+
+	// get all the entries from the database to populate contactList
+	private void getAllEntries() {
+		// query that returns all contacts
+		TypedQuery<Addresses> findAllAddresses = 
+				entityManager.createNamedQuery(
+						"Addresses.findAll", Addresses.class);
+
+		contactList.setAll(findAllAddresses.getResultList());
+		selectFirstEntry();
+	}
+
+	// select first item in listView
+	private void selectFirstEntry() {
+		listView.getSelectionModel().selectFirst();
+	}
+
+	// display contact information
+	private void displayContact(Addresses contact) {
+		if (contact != null) {
+			firstNameTextField.setText(contact.getFirstname());
+			lastNameTextField.setText(contact.getLastname());
+			emailTextField.setText(contact.getEmail());
+			phoneTextField.setText(contact.getPhonenumber());
+		} else {
+			firstNameTextField.clear();
+			lastNameTextField.clear();
+			emailTextField.clear();
+			phoneTextField.clear();
+		}
+	}
+
+	// add a new entry
+	@FXML
+	void addEntryButtonPressed(ActionEvent event) {
+		if (lastNameTextField.getText().isBlank()) {
+			displayAlert(AlertType.ERROR, "Entry Not Added",
+					"Last name field is required.");
+			return;
+		}
+
+		Addresses address = new Addresses();
+		address.setFirstname(firstNameTextField.getText());
+		address.setLastname(lastNameTextField.getText());
+		address.setPhonenumber(phoneTextField.getText());
+		address.setEmail(emailTextField.getText());
+
+		// get an EntityTransaction to manage insert operation
+		EntityTransaction transaction = entityManager.getTransaction();
+
+		try {
+			transaction.begin(); // start transaction
+			entityManager.persist(address); // store new entry
+			transaction.commit(); // commit changes to the database
+			displayAlert(AlertType.INFORMATION, "Entry Added", 
+					"New entry successfully added.");
+			getAllEntries();
+		} catch (Exception e) {// if transaction failed
+			transaction.rollback(); // undo database operations
+			displayAlert(AlertType.ERROR, "Entry Not Added",
+					"Unable to add entry: " + e);
+		}
+	}
+
+	@FXML
+	void updateEntryButtonPressed(ActionEvent event) {
+		if (lastNameTextField.getText().isBlank()) {
+			displayAlert(AlertType.ERROR, "Entry Not Updated",
+					"Last name field is required.");
+			return;
+		}
+
+		EntityTransaction entityTransaction = 
+				entityManager.getTransaction();
+
+		try {
+			entityTransaction.begin();
+			Addresses address = 
+					listView.getSelectionModel().getSelectedItem();
+			address.setFirstname(firstNameTextField.getText());
+			address.setLastname(lastNameTextField.getText());
+			address.setPhonenumber(phoneTextField.getText());
+			address.setEmail(emailTextField.getText());
+			entityTransaction.commit();
+
+			getAllEntries();
+			listView.getSelectionModel().select(address);
+		} catch (Exception e) {
+			entityTransaction.rollback();
+			displayAlert(AlertType.ERROR, "Entry Not Updated",
+					"Unable to update entry: " + e);
+		}
+	}
+
+    @FXML
+    void deleteEntryButtonPressed(ActionEvent event) {
+    	EntityTransaction entityTransaction = 
+    			entityManager.getTransaction();
+    	try {
+			entityTransaction.begin();
+			entityManager.remove(listView.getSelectionModel().getSelectedItem());
+			entityTransaction.commit();
+			getAllEntries();
+			selectFirstEntry();
+		} catch (Exception e) {
+			entityTransaction.rollback();
+			displayAlert(AlertType.ERROR, "Entry Not Deleted", 
+					"Unable to delete entry: " + e);
+		}
+    }
+
+    @FXML
+    void clearSelectionButtonPressed(ActionEvent event) {
+    	listView.getSelectionModel().clearSelection();
+    }
+
+	// find entries with the specified last name
+	@FXML
+	void findButtonPressed(ActionEvent event) {
+		// query that returns all contacts
+		TypedQuery<Addresses> findByLastname =
+				entityManager.createNamedQuery("Addresses.findByLastname",
+				Addresses.class);
+
+		// configure parameter for query
+		findByLastname.setParameter(
+				"lastname", findByLastNameTextField.getText() + "%");
+
+		// get all addresses
+		List<Addresses> people = findByLastname.getResultList();
+
+		if (people.size() > 0) { // display all entries
+			contactList.setAll(people);
+			selectFirstEntry();
+		} else {
+			displayAlert(AlertType.INFORMATION, "Lastname Not Found",
+					"There are no entries with the specified last name.");
+		}
+	}
+
+	// browse all the entries
+	@FXML
+	void browseAllButtonPressed(ActionEvent event) {
+		getAllEntries();
+	}
+
+	// display an Alert dialog
+	private void displayAlert(AlertType type, String title, 
+			String message) {
+		Alert alert = new Alert(type);
+		alert.setTitle(title);
+		alert.setContentText(message);
+		alert.showAndWait();
+	}
+}

src/ch29/ex29_03/addressbook.sql

@@ -0,0 +1,15 @@
+DROP TABLE Addresses;
+
+CREATE TABLE Addresses
+(
+	AddressID INT NOT NULL GENERATED ALWAYS AS IDENTITY,
+	FirstName VARCHAR (15) NOT NULL,
+	LastName VARCHAR (30) NOT NULL,
+	Email VARCHAR (30) NOT NULL,
+	PhoneNumber VARCHAR (15) NOT NULL,
+        PRIMARY KEY (AddressID)
+);
+
+INSERT INTO Addresses (FirstName,LastName,Email,PhoneNumber)
+	VALUES ('Mike','Green','[email protected]','555-5555'),
+	('Mary','Brown','[email protected]','555-1234');