implement questioncatalog Service

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

@@ -32,4 +32,8 @@ public class Question {
     public void setAnswer(String answer) {
         this.answer = answer;
     }
+
+    public void setQuestionCatalogId(int questionCatalogId) {
+        this.questionCatalogId = questionCatalogId;
+    }
 }

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

@@ -11,7 +11,8 @@ public class QuestionCatalog {
     private ArrayList<Question> questions;
     private String name;
 
-    public QuestionCatalog(String name, ArrayList<Question> questions) {
+    public QuestionCatalog(int id, String name, ArrayList<Question> questions) {
+        this.id = id;
         this.name = name;
         this.questions = questions;
     }
@@ -20,6 +21,14 @@ public class QuestionCatalog {
         return FXCollections.observableList(questions);
     }
 
+    public void setQuestions(ArrayList<Question> questions){
+        this.questions = questions;
+    }
+
+    public int getId(){
+        return this.id;
+    }
+
     public String getName() {
         return name;
     }

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

@@ -0,0 +1,76 @@
+package at.ionas999.questioncatalog.services;
+
+import at.ionas999.questioncatalog.model.Question;
+import at.ionas999.questioncatalog.model.QuestionCatalog;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class QuestionCatalogService {
+    public static boolean AddQuestionCatalogToDb(QuestionCatalog catalog) throws SQLException {
+        try (Connection connection = ServiceBase.GetJDBCConnection()) {
+            String insertStmt = "insert into QUESTIONCATALOG (NAME) VALUES (?)";
+
+            try (PreparedStatement statement = connection.prepareStatement(insertStmt)) {
+                statement.setString(2, catalog.getName());
+                statement.execute();
+            }
+        }
+        int id = GetLastInsertedCatalogWithoutQuestions(catalog.getName()).getId();
+        for(Question q : catalog.getQuestions()) {
+            q.setQuestionCatalogId(id);
+            QuestionService.AddQuestionToDb(q);
+        }
+
+        return true;
+    }
+
+
+    public static QuestionCatalog GetLastInsertedCatalogWithoutQuestions(String name) throws SQLException {
+        String stmtString = "select id, name from QUESTIONCATALOG order by ID desc fetch first row only";
+        QuestionCatalog catalog;
+        try (Connection connection = ServiceBase.GetJDBCConnection()) {
+
+            try (PreparedStatement statement = connection.prepareStatement(stmtString)) {
+                ResultSet rs = statement.executeQuery();
+                List<Question> questions = new ArrayList<Question>();
+                rs.next();
+                catalog = new QuestionCatalog(
+                        rs.getInt(1),
+                        rs.getString(2),
+                        null
+                );
+
+            }
+        }
+        return catalog;
+    }
+
+    public static ArrayList<QuestionCatalog> GetCatalogsWithoutQuestions(int catalogId) throws SQLException {
+        String stmtString = "select id, name from QUESTIONCATALOG where ID = ?";
+
+        try (Connection connection = ServiceBase.GetJDBCConnection()) {
+
+            try (PreparedStatement statement = connection.prepareStatement(stmtString)) {
+                statement.setInt(1, catalogId);
+                ResultSet rs = statement.executeQuery();
+                ArrayList<QuestionCatalog> catalogs = new ArrayList<>();
+
+                while (rs.next()) {
+                    QuestionCatalog catalog = new QuestionCatalog(
+                            rs.getInt(1),
+                            rs.getString(2),
+                            null
+                    );
+                    catalogs.add(catalog);
+                }
+
+                return catalogs;
+            }
+        }
+    }
+}

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

@@ -26,7 +26,7 @@ public class QuestionService {
         return true;
     }
 
-    public static List<Question> GetQuestionsFromCatalog(int catalogId) throws SQLException {
+    public static ArrayList<Question> GetQuestionsFromCatalog(int catalogId) throws SQLException {
         String stmtString = "select id, questionCatalogId, question, answer from Question where questionCatalogId = ?";
 
         try(Connection connection = ServiceBase.GetJDBCConnection()){
@@ -34,7 +34,7 @@ public class QuestionService {
             try (PreparedStatement statement = connection.prepareStatement(stmtString)){
                 statement.setInt(1, catalogId);
                 ResultSet rs = statement.executeQuery();
-                List<Question> questions = new ArrayList<Question>();
+                ArrayList<Question> questions = new ArrayList<Question>();
 
                 while (rs.next()){
                     Question question = new Question(

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

@@ -20,7 +20,7 @@ public abstract class ServiceBase {
                     create table QuestionCatalog
                     (
                         id INT PRIMARY KEY GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
-                        name varchar(10) not null
+                        name varchar(10) not null unique
                     )
                     """;
             try (Statement stmt = connection.createStatement()) {

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

@@ -7,6 +7,15 @@
             fx:controller="at.ionas999.questioncatalog.controller.ViewController"
             prefHeight="400.0" prefWidth="600.0">
 
+    <top>
+        <HBox alignment="TOP_RIGHT" spacing="10.0">
+            <padding>
+                <Insets top="10.0" right="10.0" bottom="0.0" left="10.0"/>
+            </padding>
+            <ComboBox fx:id="selectBox" promptText="Select an Catalog" />
+        </HBox>
+    </top>
+
     <left>
         <ListView fx:id="questionListView" prefWidth="200.0" />
     </left>