add - sql server database integration

SeaAnimalQuiz/SeaAnimalQuiz/Classes/Config.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Data.SqlClient;
+using System.Windows.Forms;
+using System.Data;
+
+namespace SchoolManagementSystem.Classes
+{
+    public class Config
+    {
+        private string ConnectionString = @"Data Source=(local);Initial Catalog=SeaAnimalQuiz;Integrated Security=True";
+        private SqlConnection _connection;
+        private static Config _instance;
+
+        private Config()
+        {
+            _connection = new SqlConnection(ConnectionString);
+            try
+            {
+                _connection.Open();
+            }
+            catch (Exception)
+            {
+                MessageBox.Show("Connection failed, Please try again later.", "Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+        public static Config Instance
+        {
+            get
+            {
+                if (_instance == null)
+                    _instance = new Config();
+                return _instance;
+            }
+        }
+        public SqlConnection Connection
+        {
+            get
+            {
+                return _connection;
+            }
+        }
+
+    }
+}

SeaAnimalQuiz/SeaAnimalQuiz/Classes/MCQ.cs

@@ -24,8 +24,8 @@ public class MCQ : Question
         // The fourth possible answer.
         string answer4;
 
-        // image file name
-        string imageFileName;
+        // image file
+        byte[] image;
 
         /// <summary>
         /// constructor for the MCQ class.
@@ -36,14 +36,14 @@ public class MCQ : Question
         /// <param name="answer2"></param>
         /// <param name="answer3"></param>
         /// <param name="correctAnswer"></param>
-        public MCQ(string questionText, string correctAnswer, string answer1, string answer2, string answer3, string answer4, string imageFileName)
+        public MCQ(string questionText, string correctAnswer, string answer1, string answer2, string answer3, string answer4, byte[] image)
             : base(questionText, correctAnswer, QuestionType.MultipleChoice)
         {
             this.answer1 = answer1;
             this.answer2 = answer2;
             this.answer3 = answer3;
             this.answer4 = answer4;
-            this.imageFileName = imageFileName;
+            this.image = image;
         }
 
         /// <summary>
@@ -103,11 +103,11 @@ public string Answer4
         /// <summary>
         /// this will return the image file name
         /// </summary>
-        public string ImageFileName
+        public byte[] Image
         {
             get
             {
-                return imageFileName;
+                return image;
             }
         }
 

SeaAnimalQuiz/SeaAnimalQuiz/Classes/Quiz.cs

@@ -1,5 +1,9 @@
-using System;
+using SchoolManagementSystem.Classes;
+using System;
 using System.Collections.Generic;
+using System.Data;
+using System.Data.SqlClient;
+using System.Data.SqlTypes;
 using System.IO;
 using System.Linq;
 using System.Windows.Forms;
@@ -52,60 +56,44 @@ public Quiz()
         /// <summary>
         /// load the questions from the text file.
         /// </summary>
-        public void LoadQuestions(QuizCategory category)
+        public bool LoadQuestions(QuizCategory category)
         {
-            // load the questions from the FishQuestions.txt file in the Data directory.
-            string file = "";
-            if (category == QuizCategory.Fish)
-            {
-                file = "../../Data/FishQuestions.txt";
-            }
-            else if (category == QuizCategory.Birds)
-            {
-                file = "../../Data/BirdQuestions.txt";
-            }
-            else if (category == QuizCategory.Reptiles)
-            {
-                file = "../../Data/ReptileQuestions.txt";
-            }
-
             try
             {
-                if (File.Exists(file))
+                var con = Config.Instance.Connection;
+                SqlCommand cmd = new SqlCommand("dbo.[Get_QuestionsForQuiz]", con);
+                cmd.CommandType = CommandType.StoredProcedure;
+                cmd.Parameters.Add(new SqlParameter("@Category", category.ToString()));
+                SqlDataReader reader = cmd.ExecuteReader();
+                while (reader.Read())
                 {
-                    // Store each line in array of strings
-                    string[] lines = File.ReadAllLines(file);
-
-
-                    foreach (string ln in lines)
+                    if (reader["qType"].ToString().Equals(QuestionType.MultipleChoice.ToString()))
+                    {
+                        MCQ mcq = new MCQ(reader["qText"].ToString()
+                            , reader["correctAnswer"].ToString()
+                            , reader["option1"].ToString()
+                            , reader["option2"].ToString()
+                            , reader["option3"].ToString()
+                            , reader["option4"].ToString()
+                            , reader["image"] == DBNull.Value ? null : (byte[])reader["image"]);
+                        questions.Add(mcq);
+                    }
+                    else if (reader["qType"].ToString().Equals(QuestionType.TrueFalse.ToString()))
                     {
-                        if (!(ln == null || ln == ""))
-                        {
-                            string[] data = ln.Split(new string[] { ",;," }, StringSplitOptions.None);
-                            if (data[0].Equals(QuestionType.MultipleChoice.ToString()))
-                            {
-                                // create MCQ and load data
-                                MCQ mcq = new MCQ(data[1], data[2], data[3], data[4], data[5], data[6], data[7]);
-                                questions.Add(mcq);
-                            }
-                            else if (data[0].Equals(QuestionType.TrueFalse.ToString()))
-                            {
-                                // create True False and load data
-                                TrueFalse trueFalse = new TrueFalse(data[1], data[2], data[3], data[4], data[5]);
-                                questions.Add(trueFalse);
-                            }
-                        }
+                        TrueFalse trueFalse = new TrueFalse(reader["qText"].ToString()
+                            , reader["correctAnswer"].ToString()
+                            , reader["image"] == DBNull.Value ? null : (byte[])reader["image"]);
+                        questions.Add(trueFalse);
                     }
                 }
+                reader.Close();
             }
             catch (Exception)
             {
                 MessageBox.Show("There was an error loading the questions.", "Error", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
+                return false;
             }
 
-            // Shuffle the questions.
-            ShuffleQuestions();
-
             // Reset the current question number.
             currentQuestionNumber = 0;
 
@@ -114,29 +102,8 @@ public void LoadQuestions(QuizCategory category)
 
             // Reset the number of incorrect answers.
             incorrectAnswers = 0;
-        }
-
-        /// <summary>
-        /// shuffle the questions in the list and only retain 20 questions.
-        /// </summary>
-        private void ShuffleQuestions()
-        {
-            // Create a new random number generator.
-            Random random = new Random();
-
-            // Shuffle the questions in the list.
-            for (int i = 0; i < questions.Count; i++)
-            {
-                // Get a random index.
-                int randomIndex = random.Next(0, questions.Count);
-
-                // Swap the questions at the current index and the random index.
-                Question temp = questions[i];
-                questions[i] = questions[randomIndex];
-                questions[randomIndex] = temp;
-            }
 
-            try { questions = questions.GetRange(0, 20); } catch (Exception) { }
+            return true;
         }
 
         /// <summary>

SeaAnimalQuiz/SeaAnimalQuiz/Classes/TrueFalse.cs

@@ -11,53 +11,23 @@ namespace SeaAnimalQuiz.Classes
     /// </summary>
     internal class TrueFalse : Question
     {
-        // first expected answer
-        string firstAnswer;
+        // image file
+        byte[] image;
 
-        // second expected answer
-        string secondAnswer;
-
-        // image file name
-        string imageFileName;
-
-        public TrueFalse(string questionText, string correctAnswer, string firstAnswer, string secondAnswer, string imageFileName)
+        public TrueFalse(string questionText, string correctAnswer, byte[] image)
             : base(questionText, correctAnswer, QuestionType.TrueFalse)
         {
-            this.firstAnswer = firstAnswer;
-            this.secondAnswer = secondAnswer;
-            this.imageFileName = imageFileName;
-        }
-
-        /// <summary>
-        /// This method will get the first answer.
-        /// </summary>
-        public string FirstAnswer
-        {
-            get
-            {
-                return firstAnswer;
-            }
-        }
-
-        /// <summary>
-        /// This method will get the second answer.
-        /// </summary>
-        public string SecondAnswer
-        {
-            get
-            {
-                return secondAnswer;
-            }
+            this.image = image;
         }
 
         /// <summary>
         /// This method will get the image file name.
         /// </summary>
-        public string ImageFileName
+        public byte[] Image
         {
             get
             {
-                return imageFileName;
+                return image;
             }
         }
 

SeaAnimalQuiz/SeaAnimalQuiz/SeaAnimalQuiz.csproj

@@ -46,6 +46,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Classes\Config.cs" />
     <Compile Include="Classes\MCQ.cs" />
     <Compile Include="Classes\Question.cs" />
     <Compile Include="Classes\Quiz.cs" />

SeaAnimalQuiz/SeaAnimalQuiz/UI/MainForm.cs

@@ -75,10 +75,6 @@ public void SetQuizPage(QuizCategory category)
                 ucQuiz.Instance.RefreshUc();
                 ucQuiz.Instance.BringToFront();
             }
-            else
-            {
-                MessageBox.Show("Not enough questions available for this category. Please add questions to this category.", "No Questions", MessageBoxButtons.OK, MessageBoxIcon.Information);
-            }
         }
 
         private void btnStart_Click(object sender, EventArgs e)

SeaAnimalQuiz/SeaAnimalQuiz/UI/ucAddQuestions.cs

@@ -83,32 +83,13 @@ private void rbtnTrueFalse_CheckedChanged(object sender, EventArgs e)
 
         private void btnAdd_Click(object sender, EventArgs e)
         {
-            string fileToAppend = "";
-            if (cbCategories.SelectedItem.ToString().Equals("Fish"))
-            {
-                fileToAppend = "../../Data/FishQuestions.txt";
-            }
-            else if (cbCategories.SelectedItem.ToString().Equals("Birds"))
-            {
-                fileToAppend = "../../Data/BirdQuestions.txt";
-            }
-            else if (cbCategories.SelectedItem.ToString().Equals("Reptiles"))
-            {
-                fileToAppend = "../../Data/ReptileQuestions.txt";
-            }
-            else
-            {
-                MessageBox.Show("Please select the question category.", "Select category", MessageBoxButtons.OK, MessageBoxIcon.Warning);
-                return;
-            }
-
             if (rbtnMcq.Checked)
             {
-                ucAdd_MCQ.Instance.saveQuestion(fileToAppend);
+                ucAdd_MCQ.Instance.saveQuestion(cbCategories.SelectedItem.ToString());
             }
             else if (rbtnTrueFalse.Checked)
             {
-                ucAdd_TrueFalse.Instance.saveQuestion(fileToAppend);
+                ucAdd_TrueFalse.Instance.saveQuestion(cbCategories.SelectedItem.ToString());
             }
             else
             {