public static List <SomerenModel.Activities> DB_getActivities()
{
// make a sql connection
SqlConnection connection = openConnectionDB();
// make a list to store data from DB into it
List <SomerenModel.Activities> activityList = new List <SomerenModel.Activities>();
// sql query
string sqlQuery = "SELECT activity_id, activity_desc, numberofStudents, numberofSupervisors " +
"FROM Activities";
// execute the sql query
SqlCommand command = new SqlCommand(sqlQuery, connection);
SqlDataReader reader = command.ExecuteReader();
// read data from DB
while (reader.Read())
{
SomerenModel.Activities activities = new SomerenModel.Activities();
activities.setId((int)reader["activity_id"]);
activities.setActivity_desc((string)reader["activity_desc"]);
activities.setNumOfStudents((int)reader["numberofStudents"]);
activities.setNumOfSupervisors((int)reader["numberofSupervisors"]);
activityList.Add(activities);
}
// close all connections
reader.Close();
connection.Close();
return(activityList);
}
public static void uppdateActivity(int id, string desc, int numOfStudents, int numberOfSupervisor)
{
// make a new variable of type SomerenModel.Activities in order to store data to it
SomerenModel.Activities newActivity = new SomerenModel.Activities();
// store data to the newActivity variable
newActivity.setId(id);
newActivity.setActivity_desc(desc);
newActivity.setNumOfStudents(numOfStudents);
newActivity.setNumOfSupervisors(numberOfSupervisor);
// passing data to the DB layer
SomerenDB.DB_uppdateActivity(newActivity);
}
public static void addActivity(string desc, int numOfStudents, int numberOfSupervisor)
{
// make a list for retrieving data from it
List <SomerenModel.Activities> activities = new List <SomerenModel.Activities>();
// linking the list to the DB connection in order to get data from it
activities = SomerenDB.DB_getActivities();
// make a new variable of type SomerenModel.Activities in order to store data to it
SomerenModel.Activities newActivity = new SomerenModel.Activities();
// make a list to store avtivity description in it
List <string> activityDesc = new List <string>();
// add avtivity description to the activityDesc list
foreach (SomerenModel.Activities activity in activities)
{
activityDesc.Add(activity.getActivity_desc().ToLower());
}
// make a validation to know if the data entered is diffrenet from DB data
if (activityDesc.Contains(desc.ToLower()))
{
// show a message if the entered data exists in the DB
MessageBox.Show("You can not add the same activity twice, please enter another activity name!",
"Warning", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
//store data to the newActivity variable
newActivity.setActivity_desc(desc);
newActivity.setNumOfStudents(numOfStudents);
newActivity.setNumOfSupervisors(numberOfSupervisor);
// passing data to the DB layer
SomerenDB.DB_addActivity(newActivity);
// show a messagebox after a successfull addition
MessageBox.Show("You have successfully added a new activity!!\n" +
"Enter Refresh the list to see the changes", "",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}