Esempio n. 1
0
        public bool Update(CRUD crud)
        {
            bool          isSuccess = false;
            SqlConnection conn      = new SqlConnection(myconnstring);

            try
            {
                string connect = null;
                if (TrueOrFalse.Get() == true)
                {
                    connect = "UPDATE Students SET LastName=@LastName,FirstName=@FirstName,Age=@Age WHERE StudentID=@ID ";
                }
                else
                {
                    connect = "UPDATE Teachers SET LastName=@LastName,FirstName=@FirstName,Age=@Age WHERE TeacherID=@ID ";
                }


                string sql = connect +
                             "UPDATE Contacts SET  City=@City,Address=@Address,Phone=@Phone  WHERE ContactID=@ID";

                SqlCommand cmd = new SqlCommand(sql, conn);

                cmd.Parameters.AddWithValue("@Id", crud.ID);
                cmd.Parameters.AddWithValue("@LastName", crud.LastName);
                cmd.Parameters.AddWithValue("@FirstName", crud.FirstName);
                cmd.Parameters.AddWithValue("@Age", crud.Age);
                cmd.Parameters.AddWithValue("@City", crud.City);
                cmd.Parameters.AddWithValue("@Address", crud.Address);
                cmd.Parameters.AddWithValue("@Phone", crud.Phone);



                conn.Open();
                int rows = cmd.ExecuteNonQuery();

                if (rows > 0)
                {
                    isSuccess = true;
                }
                else
                {
                    isSuccess = false;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return(isSuccess);
        }
Esempio n. 2
0
        public bool Delete(CRUD crud)
        {
            bool          isSuccess = false;
            SqlConnection conn      = new SqlConnection(myconnstring);

            try
            {
                int    currentnumber = ID - 1;
                string lastarg       = currentnumber.ToString() + " )";
                string foo           = "DBCC CHECKIDENT(Students, RESEED, " + lastarg;
                string foo1          = "DBCC CHECKIDENT(Contacts, RESEED, " + lastarg;

                if (TrueOrFalse.Get() == false)
                {
                    foo = "DBCC CHECKIDENT(Teachers, RESEED, " + lastarg;
                }


                string connect = null;
                if (TrueOrFalse.Get() == true)
                {
                    connect = foo1 + "DELETE FROM Students WHERE StudentId=@Id " + foo;
                }
                else
                {
                    connect = foo1 + "DELETE FROM Teachers WHERE TeacherID=@Id " + foo;
                }



                SqlCommand cmd = new SqlCommand(connect, conn);
                cmd.Parameters.AddWithValue("@ID", crud.ID);
                conn.Open();
                int rows = cmd.ExecuteNonQuery();
                if (rows > 0)
                {
                    isSuccess = true;
                }
                else
                {
                    isSuccess = false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }
            return(isSuccess);
        }
Esempio n. 3
0
        public DataTable Select()
        {
            SqlConnection conn = new SqlConnection(myconnstring);
            DataTable     dt   = new DataTable();

            try
            {
                string sql = "SELECT s.StudentId,s.LastName,s.FirstName,s.Age,c.City,c.Address,c.Phone" +
                             " FROM Students as s LEFT JOIN Contacts as c ON s.StudentId=c.StudentId";

                string sql1 = "SELECT s.TeacherID,s.LastName,s.FirstName,s.Age,c.City,c.Address,c.Phone" +
                              " FROM Teachers as s LEFT JOIN Contacts as c ON s.TeacherID=c.TeacherID";

                string connect = null;

                if (TrueOrFalse.Get() == true)
                {
                    connect = sql;
                }
                else
                {
                    connect = sql1;
                }



                SqlCommand     cmd     = new SqlCommand(connect, conn);
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);

                conn.Open();
                adapter.Fill(dt);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }
            return(dt);
        }
Esempio n. 4
0
        public bool Insert(CRUD crud)
        {
            bool          isSuccess = false;
            SqlConnection conn      = new SqlConnection(myconnstring);

            try
            {
                string teacher =

                    " INSERT INTO Teachers" +
                    "(LastName,FirstName,Age)" +
                    "VALUES" +
                    "(@LastName,@FirstName,@Age)";

                string student =
                    " INSERT INTO Students" +
                    "(LastName,FirstName,Age)" +
                    "VALUES" +
                    "(@LastName,@FirstName,@Age)";

                string contacts
                    = "INSERT INTO  Contacts(StudentID,City,Address,Phone) " +
                      "VALUES (@ID,@City,@Address,@Phone)";

                string contacts1
                    = "INSERT INTO  Contacts(TeacherID,City,Address,Phone) " +
                      "VALUES (@ID,@City,@Address,@Phone)";


                string connect = null;

                if (TrueOrFalse.Get() == true)
                {
                    connect = student + contacts;
                }
                else
                {
                    connect = teacher + contacts1;
                }



                SqlCommand cmd = new SqlCommand(connect, conn);

                cmd.Parameters.AddWithValue("@Id", crud.ID);
                cmd.Parameters.AddWithValue("@FirstName", crud.FirstName);
                cmd.Parameters.AddWithValue("@LastName", crud.LastName);
                cmd.Parameters.AddWithValue("@Age", crud.Age);
                cmd.Parameters.AddWithValue("@City", crud.City);
                cmd.Parameters.AddWithValue("@Address", crud.Address);
                cmd.Parameters.AddWithValue("@Phone", crud.Phone);



                conn.Open();
                int rows = cmd.ExecuteNonQuery();

                if (rows > 0)
                {
                    isSuccess = true;
                }
                else
                {
                    isSuccess = false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return(isSuccess);
        }