implemented deleteion without validataion

src/main/java/at/ionas999/questioncatalog/controller/ViewController.java

@@ -1,27 +1,87 @@
 package at.ionas999.questioncatalog.controller;
 
 import at.ionas999.questioncatalog.model.Question;
+import at.ionas999.questioncatalog.model.QuestionCatalog;
+import at.ionas999.questioncatalog.services.QuestionCatalogService;
 import at.ionas999.questioncatalog.services.QuestionService;
+import at.ionas999.questioncatalog.services.ServiceBase;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
-import javafx.scene.control.Button;
-import javafx.scene.control.ListView;
-import javafx.scene.control.TextArea;
-import javafx.scene.control.TextField;
+import javafx.scene.control.*;
 
 import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.List;
 
 public class ViewController {
-    public Button editButton;
-    public Button deleteButton;
-    public TextField answerField;
-    public ListView questionListView;
-    public TextField questionField;
+    @FXML
+    private ComboBox selectBox;
+    @FXML
+    private Button editButton;
+    @FXML
+    private Button deleteButton;
+    @FXML
+    private TextField answerField;
+    @FXML
+    private ListView questionListView;
+    @FXML
+    private TextField questionField;
 
+    private Question currentQuestion = null;
+    private ObservableList<QuestionCatalog> catalogs;
+    private ObservableList<Question> questions;
 
     @FXML
     private void initialize() throws SQLException {
-        List<Question> questions = QuestionService.GetQuestionsFromCatalog(1);
-        System.out.println(questions);
+        this.catalogs = FXCollections.observableList(QuestionCatalogService.GetCatalogsWithoutQuestions());
+        selectBox.setItems(catalogs);
+        addObserverToSelectBox();
+        addListenerToListView();
+    }
+
+    private void addListenerToListView() {
+        questionListView.getSelectionModel().selectedItemProperty().addListener((observableValue, oldValue, newValue) -> {
+            currentQuestion = (Question) newValue;
+            if (newValue != null) {
+                Question q = (Question) newValue;
+                questionField.setText(q.getQuestion());
+                answerField.setText(q.getAnswer());
+            }
+        });
+    }
+
+    private void addObserverToSelectBox() {
+        selectBox.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
+            if (newValue == null) {
+                return;
+            }
+
+            try {
+                setQuestionListView(((QuestionCatalog) newValue).getId());
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        });
+    }
+
+    private void setQuestionListView(int catalogId) throws SQLException {
+        this.questions = FXCollections.observableList(QuestionService.GetQuestionsFromCatalog(catalogId));
+        questionListView.setItems(questions);
+    }
+
+
+    @FXML
+    private void deleteQuestion(ActionEvent actionEvent) {
+        questions.remove(currentQuestion);
+        QuestionService.DeleteQuestion(currentQuestion.getId());
+        this.questionListView.refresh();
+        this.currentQuestion = null;
+    }
+
+    @FXML
+    private void editQuestion(ActionEvent actionEvent) {
+
     }
 }

src/main/java/at/ionas999/questioncatalog/model/Question.java

@@ -36,4 +36,13 @@ public class Question {
     public void setQuestionCatalogId(int questionCatalogId) {
         this.questionCatalogId = questionCatalogId;
     }
+
+    public int getId()
+    {
+        return id;
+    }
+    @Override
+    public String toString() {
+        return question;
+    }
 }

src/main/java/at/ionas999/questioncatalog/model/QuestionCatalog.java

@@ -33,4 +33,8 @@ public class QuestionCatalog {
         return name;
     }
 
+    @Override
+    public String toString() {
+        return this.getName();
+    }
 }

src/main/java/at/ionas999/questioncatalog/services/QuestionCatalogService.java

@@ -50,13 +50,12 @@ public class QuestionCatalogService {
         return catalog;
     }
 
-    public static ArrayList<QuestionCatalog> GetCatalogsWithoutQuestions(int catalogId) throws SQLException {
-        String stmtString = "select id, name from QUESTIONCATALOG where ID = ?";
+    public static ArrayList<QuestionCatalog> GetCatalogsWithoutQuestions() throws SQLException {
+        String stmtString = "select id, name from QUESTIONCATALOG";
 
         try (Connection connection = ServiceBase.GetJDBCConnection()) {
 
             try (PreparedStatement statement = connection.prepareStatement(stmtString)) {
-                statement.setInt(1, catalogId);
                 ResultSet rs = statement.executeQuery();
                 ArrayList<QuestionCatalog> catalogs = new ArrayList<>();
 

src/main/java/at/ionas999/questioncatalog/services/QuestionService.java

@@ -50,4 +50,20 @@ public class QuestionService {
             }
         }
     }
+
+    public static boolean DeleteQuestion(int id){
+        try(Connection connection = ServiceBase.GetJDBCConnection()){
+            String insertStmt = "delete from QUESTION where ID = ?";
+
+            try (PreparedStatement statement = connection.prepareStatement(insertStmt)){
+                statement.setInt(1, id);
+                statement.execute();
+            }
+        }
+        catch (SQLException _){
+            return false;
+        }
+
+        return true;
+    }
 }

src/main/resources/at/ionas999/questioncatalog/view.fxml

@@ -28,8 +28,8 @@
             <TextField fx:id="questionField" editable="false" />
             <TextField fx:id="answerField" promptText="Answer" editable="false" />
             <HBox spacing="10.0" alignment="BOTTOM_RIGHT">
-                <Button fx:id="deleteButton" text="Delete" />
-                <Button fx:id="editButton" text="Edit" />
+                <Button fx:id="deleteButton" onAction="#deleteQuestion" text="Delete" />
+                <Button fx:id="editButton" text="Edit" onAction="#editQuestion"   />
             </HBox>
         </VBox>
     </center>