implementd basic Question Service

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

@@ -1,14 +1,27 @@
 package at.ionas999.questioncatalog.controller;
 
+import at.ionas999.questioncatalog.model.Question;
+import at.ionas999.questioncatalog.services.QuestionService;
+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 java.sql.SQLException;
+import java.util.List;
+
 public class ViewController{
     public Button editButton;
     public Button deleteButton;
     public TextField answerField;
     public ListView questionListView;
     public TextField questionField;
+
+
+    @FXML
+    private void initialize() throws SQLException {
+        List<Question> questions = QuestionService.GetQuestionsFromCatalog(1);
+        System.out.println(questions);
+    }
 }

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

@@ -0,0 +1,35 @@
+package at.ionas999.questioncatalog.model;
+
+public class Question {
+    private int id;
+    private String question;
+    private String answer;
+    private int questionCatalogId;
+
+    public Question(int id,String question, String answer, int questionCatalogId) {
+        this.id = id;
+        this.question = question;
+        this.answer = answer;
+        this.questionCatalogId = questionCatalogId;
+    }
+
+    public int getQuestionCatalogId()
+    {
+        return questionCatalogId;
+    }
+    public String getQuestion() {
+        return question;
+    }
+
+    public void setQuestion(String question) {
+        this.question = question;
+    }
+
+    public String getAnswer() {
+        return answer;
+    }
+
+    public void setAnswer(String answer) {
+        this.answer = answer;
+    }
+}

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

@@ -0,0 +1,27 @@
+package at.ionas999.questioncatalog.model;
+
+
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+
+import java.util.ArrayList;
+
+public class QuestionCatalog {
+    private int id;
+    private ArrayList<Question> questions;
+    private String name;
+
+    public QuestionCatalog(String name, ArrayList<Question> questions) {
+        this.name = name;
+        this.questions = questions;
+    }
+
+    public ObservableList<Question> getQuestions() {
+        return FXCollections.observableList(questions);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+}

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

@@ -0,0 +1,53 @@
+package at.ionas999.questioncatalog.services;
+
+import at.ionas999.questioncatalog.model.Question;
+
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+
+public class QuestionService {
+    public static boolean AddQuestionToDb(Question question)
+    {
+        try(Connection connection = ServiceBase.GetJDBCConnection()){
+            String insertStmt = "insert into QUESTION (QUESTIONCATALOGID, QUESTION, ANSWER) VALUES (?, ?, ?)";
+
+            try (PreparedStatement statement = connection.prepareStatement(insertStmt)){
+                statement.setInt(1, question.getQuestionCatalogId());
+                statement.setString(2, question.getQuestion());
+                statement.setString(3, question.getAnswer());
+                statement.execute();
+            }
+        }
+        catch (SQLException _){
+           return false;
+        }
+
+        return true;
+    }
+
+    public static List<Question> GetQuestionsFromCatalog(int catalogId) throws SQLException {
+        String stmtString = "select id, questionCatalogId, question, answer from Question where questionCatalogId = ?";
+
+        try(Connection connection = ServiceBase.GetJDBCConnection()){
+
+            try (PreparedStatement statement = connection.prepareStatement(stmtString)){
+                statement.setInt(1, catalogId);
+                ResultSet rs = statement.executeQuery();
+                List<Question> questions = new ArrayList<Question>();
+
+                while (rs.next()){
+                    Question question = new Question(
+                            rs.getInt(1),
+                            rs.getString(3),
+                            rs.getString(4),
+                            rs.getInt(2)
+                    );
+                    questions.add(question);
+                }
+
+                return questions;
+            }
+        }
+    }
+}

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

@@ -0,0 +1,54 @@
+package at.ionas999.questioncatalog.services;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public abstract class ServiceBase {
+
+    public static Connection GetJDBCConnection() throws SQLException {
+        Connection con = DriverManager.getConnection("jdbc:derby:/tmp/questionCatalog.db;create=true");
+        CreateTables(con);
+        return con;
+    }
+
+   private static void CreateTables(Connection connection) throws SQLException {
+        if (!doesTableExist(connection, "QUESTIONCATALOG")) {
+            System.out.println("does x");
+            String createQuestionCatalogTable = """
+                    create table QuestionCatalog
+                    (
+                        id INT PRIMARY KEY GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
+                        name varchar(10) not null
+                    )
+                    """;
+            try (Statement stmt = connection.createStatement()) {
+                stmt.execute(createQuestionCatalogTable);
+            }
+        }
+
+        if (!doesTableExist(connection, "QUESTION")) {
+            System.out.println("does x");
+            String createQuestionTable = """
+                    create table Question
+                    (
+                        id INT PRIMARY KEY GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
+                        questionCatalogId integer,
+                        question varchar(100) not null,
+                        answer varchar(100) not null,
+                        constraint fk_questionCatalog foreign key (questionCatalogId) references QuestionCatalog(id)
+                    )
+                    """;
+            try (Statement stmt = connection.createStatement()) {
+                stmt.execute(createQuestionTable);
+            }
+        }
+    }
+
+    private static boolean doesTableExist(Connection connection, String tableName) throws SQLException {
+        try (var resultSet = connection.getMetaData().getTables(null, null, tableName.toUpperCase(), null)) {
+            return resultSet.next();
+        }
+    }
+}

src/main/java/module-info.java

@@ -2,6 +2,7 @@ module at.ionas999.questioncatalog {
     requires javafx.controls;
     requires javafx.fxml;
     requires java.desktop;
+    requires java.sql;
 
     opens at.ionas999.questioncatalog to javafx.fxml;
     opens at.ionas999.questioncatalog.controller to javafx.fxml; // Add this line