/// <summary>
///
/// </summary>
/// <param name="theAnswer"></param>
public void CreateAnswer(AnswerData theAnswer)
{
theAnswer.Id = NextId;
if (DataReader != null)
DataReader.Close();
SQL = "INSERT INTO `answers` (`answer_id`, `text`, `is_correct`) VALUES (\"" +
theAnswer.Id +
"\", \"" +
theAnswer.Text +
"\", \"" +
theAnswer.Correct +
"\");";
InitializeCommand();
OpenConnection();
int result = ExecuteStoredProcedure();
CloseConnection();
if (result == 0)
throw new Exception("Could not add the answer to the database");
}
public static void GetQuestions(QuizData quiz)
{
//TODO replace code to get questions from database
quiz.questions.Clear();
QuestionData newQuestion = new QuestionData(0);
AnswerData correctAnswer = new AnswerData(0);
AnswerData wrongAnswer = new AnswerData(0);
correctAnswer.Correct = true;
correctAnswer.Text = "This is the correct answer";
wrongAnswer.Text = "This is a wrong answer";
newQuestion.Text = "This is a question";
newQuestion.answers.Add(correctAnswer);
newQuestion.answers.Add(wrongAnswer);
newQuestion.answers.Add(wrongAnswer);
newQuestion.answers.Add(wrongAnswer);
for (int i = 0; i < 10; i++)
{
quiz.questions.Add(newQuestion);
}
}
public void AddAnswer(AnswerData answerIn)
{
answers_internal.Add(answerIn);
}
public void AddAnswer(AnswerData answerIn)
{
answers_internal.Add(answerIn);
}
/// <summary>
/// handles ok button click event.
/// Updates external reference if question is valid
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnOK_Click(object sender, EventArgs e)
{
//validate question
if (txtQuestion.Text == "")
{
MessageBox.Show("Question does not have text!", "Invalid Question");
}
//validate answers
else if ( (txtAnswer1.Text == "") ||
(txtAnswer2.Text == "") ||
(txtAnswer3.Text == "") ||
(txtAnswer4.Text == "") )
{
MessageBox.Show("All answers must have text!", "Invalid Question");
}
else if ((rbtn1.Checked == false) &&
(rbtn2.Checked == false) &&
(rbtn3.Checked == false) &&
(rbtn4.Checked == false))
{
MessageBox.Show("No correct answer has been selected!", "Invalid Question");
}
else
{
//are we creating a new question or updating an old one?
if (isNewQuestion) //new question
{
externalQuestion.Text = txtQuestion.Text;
AnswerData answer;
answer = new AnswerData(0);
answer.Text = txtAnswer1.Text;
answer.Correct = rbtn1.Checked;
externalQuestion.AddAnswer(answer);
answer = new AnswerData(0);
answer.Text = txtAnswer2.Text;
answer.Correct = rbtn2.Checked;
externalQuestion.AddAnswer(answer);
answer = new AnswerData(0);
answer.Text = txtAnswer3.Text;
answer.Correct = rbtn3.Checked;
externalQuestion.AddAnswer(answer);
answer = new AnswerData(0);
answer.Text = txtAnswer4.Text;
answer.Correct = rbtn4.Checked;
externalQuestion.AddAnswer(answer);
this.Disposed -= frmQuestion_Disposed;
this.Dispose();
}
//change the old question
else
{
externalQuestion.Text = txtQuestion.Text;
externalQuestion.Answers[0].Text = txtAnswer1.Text;
externalQuestion.Answers[0].Correct = rbtn1.Checked;
externalQuestion.Answers[1].Text = txtAnswer2.Text;
externalQuestion.Answers[1].Correct = rbtn2.Checked;
externalQuestion.Answers[2].Text = txtAnswer3.Text;
externalQuestion.Answers[2].Correct = rbtn3.Checked;
externalQuestion.Answers[3].Text = txtAnswer4.Text;
externalQuestion.Answers[3].Correct = rbtn4.Checked;
this.Disposed -= frmQuestion_Disposed;
this.Dispose();
}
}
}
/// <summary>
///
/// </summary>
/// <param name="theAnswer"></param>
public void DeleteAnswer(AnswerData theAnswer)
{
if (DataReader != null)
DataReader.Close();
SQL = "DELETE FROM `answers` WHERE `answer_id` = \"" + theAnswer.Id + "\";";
InitializeCommand();
OpenConnection();
int result = ExecuteStoredProcedure();
if (result == 0)
throw new Exception("Could not delete the answer from the database");
if( DataReader != null)
DataReader.Close();
SQL = "DELETE FROM `rel_questions_answers` WHERE `answer_id` = \"" + theAnswer.Id + "\";";
InitializeCommand();
result = ExecuteStoredProcedure();
if (result == 0)
throw new Exception("Could not delete the answer relation from the database");
if (DataReader != null)
DataReader.Close();
SQL = "DELETE FROM `rel_answers_users` WHERE `answer_id` = \"" + theAnswer.Id + "\";";
InitializeCommand();
result = ExecuteStoredProcedure();
CloseConnection();
if (result == 0)
throw new Exception("Could not clear the results for that answer");
}
/// <summary>
///
/// </summary>
/// <param name="theAnswer"></param>
public void UpdateAnswer(AnswerData theAnswer)
{
if (DataReader != null)
DataReader.Close();
SQL = "UPDATE `answer` a SET a.`text` = \"" +
theAnswer.Text +
"\", a.`correct` = \"" +
theAnswer.Correct +
"\" WHERE a.`answer_id` = \"" +
theAnswer.Id +
"\";";
InitializeCommand();
OpenConnection();
int result = ExecuteStoredProcedure();
CloseConnection();
if (result == 0)
throw new Exception("The Answer Could Not Be Updated");
}
/// <summary>
/// Gets a list of Answers object associated with a question
/// </summary>
/// <param name="theQuestion">the question being queried</param>
/// <returns>a list of Answer objects</returns>
public List<AnswerData> ReadAnswers(QuestionData theQuestion)
{
List<AnswerData> return_data = new List<AnswerData>();
if (DataReader != null)
DataReader.Close();
SQL = "SELECT * from `answers` a INNER JOIN `rel_questions_answers` r ON r.`answer_id` = a.`answer_id` WHERE r.`question_id` = \"" + theQuestion.id + "\";";
InitializeCommand();
OpenConnection();
DataReader = Command.ExecuteReader();
if (DataReader.HasRows) {
while (DataReader.Read()) {
AnswerData temp = new AnswerData(DataReader.GetUInt16("answer_id"));
temp.Correct = DataReader.GetBoolean("is_correct");
temp.Text = DataReader.GetString("text");
return_data.Add(temp);
}
}
CloseConnection();
return return_data;
}
/// <summary>
/// Gets a single answer object from the database with the specified Text
/// </summary>
/// <param name="text">the text of the answer</param>
/// <returns>an Answer object</returns>
public AnswerData ReadAnswer(String text)
{
AnswerData return_value = null;
if (DataReader != null)
DataReader.Close();
SQL = "SELECT * FROM `answers` a WHERE a.`text` = \"" + text + "\";";
InitializeCommand();
OpenConnection();
DataReader = Command.ExecuteReader();
if (DataReader.HasRows) {
DataReader.Read();
return_value = new AnswerData(DataReader.GetUInt16("answer_id"));
return_value.Text = DataReader.GetString("text");
return_value.Correct = DataReader.GetBoolean("is_correct");
}
CloseConnection();
if (return_value == null)
throw new Exception("The Answer did not exist on the database");
return return_value;
}
public static bool ValidateAnswer(AnswerData theAnswer)
{
return string.IsNullOrEmpty(theAnswer.Text);
}
