public void VoegKlasToe(Klas k)
{
SqlConnection connection = getConnection();
string query = "INSERT INTO dbo.klasSQL (klasnaam) VALUES(@klasnaam)";
using (SqlCommand command = connection.CreateCommand())
{
connection.Open();
try
{
command.Parameters.Add(new SqlParameter("@klasnaam", SqlDbType.NVarChar));
command.CommandText = query;
command.Parameters["@klasnaam"].Value = k.klasnaam;
command.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
finally
{
connection.Close();
}
}
}
public Klas GeefKlas(int id)
{
SqlConnection connection = getConnection();
string query = "SELECT * FROM dbo.klasSQL WHERE id=@id";
using (SqlCommand command = connection.CreateCommand())
{
command.CommandText = query;
SqlParameter paramId = new SqlParameter();
paramId.ParameterName = "@Id";
paramId.DbType = DbType.Int32;
paramId.Value = id;
command.Parameters.Add(paramId);
connection.Open();
try
{
IDataReader reader = command.ExecuteReader(); //of SqlDataReader
reader.Read();
Klas klas = new Klas((int)reader["Id"], (string)reader["klasnaam"]);
reader.Close();
return(klas);
}
catch (Exception ex)
{
Console.WriteLine(ex);
return(null);
}
finally
{
connection.Close();
}
}
}
public Student(int studentId, string naam, Klas klas)
{
this.studentId = studentId;
this.naam = naam;
this.klas = klas;
this.cursussen = new List <Cursus>();
}
public Student GeefStudent(int id)
{
SqlConnection connection = getConnection();
string queryS = "SELECT * FROM dbo.studentSQL WHERE id=@id";
string querySC = "SELECT * FROM [dbo].[cursusSQL] t1,[dbo].[student_cursusSQL] t2 "
+ "where t1.Id = t2.cursusid and t2.studentid = @id";
using (SqlCommand command = connection.CreateCommand())
{
command.CommandText = queryS;
SqlParameter paramId = new SqlParameter();
paramId.ParameterName = "@Id";
paramId.DbType = DbType.Int32;
paramId.Value = id;
command.Parameters.Add(paramId);
connection.Open();
try
{
SqlDataReader reader = command.ExecuteReader();
reader.Read();
int studentId = (int)reader["Id"];
string studentnaam = (string)reader["naam"];
int klasId = (int)reader["klasId"];
reader.Close();
Klas klas = GeefKlas(klasId);
Student student = new Student(studentId, studentnaam, klas);
command.CommandText = querySC;
reader = command.ExecuteReader();
while (reader.Read())
{
Cursus cursus = new Cursus(reader.GetInt32(0), reader.GetString(1));
student.voegCursusToe(cursus);
}
reader.Close();
return(student);
}
catch (Exception ex)
{
Console.WriteLine(ex);
return(null);
}
finally
{
connection.Close();
}
}
}
public Student(string naam, Klas klas)
{
this.naam = naam;
this.klas = klas;
this.cursussen = new List <Cursus>();
}