Setup and forms

paymentLogs/Repositories/CourseRepo.cs

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+using MySql.Data.MySqlClient;
+using PaymentLogs.Domain;
+using PaymentLogs.Utils;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Security.Policy;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PaymentLogs.Repositories
+{
+    internal class CourseRepo : Repo<int, Course>
+    {
+
+        public override void Load()
+        {
+            DataBase db = new DataBase();
+            db.openConnection();
+            _data.Clear();
+            string sql = " SELECT * FROM courses  ";
+            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+            MySqlDataReader reader = cmd.ExecuteReader();
+
+            while (reader.Read())
+            {
+                Course course = new Course() { 
+                    Id = reader.GetInt32("id"), 
+                    Name = reader.GetString("name"),
+                    Type = reader.GetString("type"),
+                    Cost = reader.GetInt32("cost"),
+                    Duration = reader.GetInt32("duration"),
+                    StudentsCount = reader.GetInt32("students_count")
+                };
+                _data[course.Id] = course;
+            }
+            db.closeConnection();
+        }
+
+
+        public override void Save()
+        {
+            
+            foreach(Course course in All())
+            {
+                DataBase db = new DataBase();
+                db.openConnection();
+                string sql = $" INSERT INTO `courses` (`id`, `name`, `type`, `cost`, `duration`, `students_count`) VALUES ('{course.Id}'," +
+                    $"'{course.Name}', '{course.Type}', '{course.Cost}', '{course.Duration}', '{course.StudentsCount}') " +
+                $"ON DUPLICATE KEY UPDATE `name`='{course.Name}', `type`='{course.Type}', `cost`='{course.Cost}', `duration`='{course.Duration}'," +
+                $"`students_count`='{course.StudentsCount}' ";
+                MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+                cmd.ExecuteNonQuery();
+                db.closeConnection();
+            }
+            
+           
+        }
+
+        public Course ByName(string name)
+        {
+            foreach (var course in _data.Values)
+            {
+                if (course.Name.ToLower().Equals(name.ToLower()))
+                {
+                    return course;
+                }
+            }
+            return _data.Values.FirstOrDefault();
+        }
+    }
+}

paymentLogs/Repositories/PaymentRepo.cs

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+using MySql.Data.MySqlClient;
+using PaymentLogs.Domain;
+using PaymentLogs.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PaymentLogs.Repositories
+{
+    internal class PaymentRepo : Repo<int, Payment>
+    {
+
+        public override void Load()
+        {
+            DataBase db = new DataBase();
+            db.openConnection();
+            _data.Clear();
+            string sql = " SELECT * FROM payments  ";
+            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+            MySqlDataReader reader = cmd.ExecuteReader();
+
+            while (reader.Read())
+            {
+                Payment payment = new Payment()
+                {
+                    Id = reader.GetInt32("id"),
+                    FCs = reader.GetString("fcs"),
+                    CourseId = reader.GetInt32("course_id"),
+                    CoursePrice = reader.GetInt32("course_price"),
+                    Paid = reader.GetInt32("paid"),
+                    Debt = reader.GetInt32("debt")
+                };
+                _data[payment.Id] = payment;
+
+            }
+            db.closeConnection();
+        }
+
+
+        public override void Save()
+        {
+            DataBase db = new DataBase();
+            db.openConnection();
+            foreach(Payment payment in _data.Values)
+            {
+                string sql = $" INSERT INTO `payments` (`id`, `fcs`, `course_id`, `course_price`, `paid`, `debt`) " +
+                    $"VALUES ('{payment.Id}','{payment.FCs}', '{payment.CourseId}', '{payment.CoursePrice}', '{payment.Paid}', '{payment.Debt}') " +
+                    $"ON DUPLICATE KEY UPDATE `fcs`='{payment.FCs}', `course_id`='{payment.CourseId}', `course_price` = '{payment.CoursePrice}', " +
+                    $"`paid` = '{payment.Paid}', `debt`='{payment.Debt}'";
+                MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+                cmd.ExecuteNonQuery();
+                
+            }
+            db.closeConnection();
+        }
+    }
+}

paymentLogs/Repositories/Repo.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PaymentLogs.Repositories
+{
+    internal abstract class Repo<K, V>
+    {
+        protected Dictionary<K, V> _data = new Dictionary<K, V>();
+        public abstract void Load();
+        public virtual List<V> All()
+        {
+            return _data.Values.ToList();
+        }
+        public virtual V Get(K key) { return _data[key]; }
+        public virtual void Update(K key, V value)
+        {
+            _data[key] = value;
+        }
+        public abstract void Save();
+    }
+
+
+}

paymentLogs/Repositories/StudentRepo.cs

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+using MySql.Data.MySqlClient;
+using PaymentLogs.Domain;
+using PaymentLogs.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Policy;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PaymentLogs.Repositories
+{
+    internal class StudentRepo : Repo<int, Student>
+    {
+
+        public override void Load()
+        {
+            DataBase db = new DataBase();
+            db.openConnection();
+            _data.Clear();
+            string sql = " SELECT * FROM students  ";
+            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+            MySqlDataReader reader = cmd.ExecuteReader();
+
+            while (reader.Read())
+            {
+                Student student = new Student()
+                {
+                    Id = reader.GetInt32("id"),
+                    FCs = reader.GetString("fcs"),
+                    dateOfBirth = DateTime.ParseExact(reader.GetString("date_of_birth"), "yyyy-MM-dd",null),
+                    Address = reader.GetString("address"),
+                    CourseId = reader.GetInt32("course_id"),
+                    Paid = reader.GetInt32("paid")
+
+                };
+                _data[student.Id] = student;
+            }
+            db.closeConnection();
+        }
+
+
+
+        public override void Save()
+        {
+            DataBase db = new DataBase();
+            db.openConnection();
+            foreach (Student student in All())
+            {
+                string sql = $" INSERT INTO `students` (`id`, `fcs`, `date_of_birth`, `address`, `course_id`, `paid`) " +
+                $"VALUES ('{student.Id}','{student.FCs}','{ String.Format("{0:yyyy-MM-dd}", student.dateOfBirth) }', '{student.Address}'," +
+                $"'{student.CourseId}', '{student.Paid}') " +
+                $"ON DUPLICATE KEY UPDATE `fcs`='{student.FCs}', `date_of_birth`='{String.Format("{0:yyyy-MM-dd}", student.dateOfBirth)}'," +
+                $"`address`='{student.Address}', `course_id`='{student.CourseId}', `paid`='{student.Paid}'";
+                MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+                cmd.ExecuteNonQuery();
+            }
+           
+            
+            db.closeConnection();
+        }
+    }
+}

paymentLogs/Repositories/UserRepo.cs

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+using MySql.Data.MySqlClient;
+using PaymentLogs.Domain;
+using PaymentLogs.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Security;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PaymentLogs.Repositories
+{
+    internal class UserRepo : Repo<string, User>
+    {
+
+        public override void Load()
+        {
+            DataBase db = new DataBase();
+            _data.Clear();
+            string sql = " SELECT * FROM usrs  ";
+            db.openConnection();
+            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+            MySqlDataReader reader = cmd.ExecuteReader();
+
+            while (reader.Read()) {
+                User user = new User() { Login = reader.GetString("login"), PasswordHash = StringUtils.ConvertToSecureString(reader.GetString("password_hash")) };
+                _data[user.Login] = user;
+            }
+            db.closeConnection();
+        }
+
+
+
+        public void RegisterUser(string _login, string _password)
+        {
+            User user = new User() { Login =  _login.ToLower(), PasswordHash = StringUtils.ConvertToSecureString(StringUtils.SHA256_hash(_password)) };
+            Save(user);
+        }
+
+        public Boolean HasUser(string _login)
+        {
+            return _data.ContainsKey(_login.ToLower());
+        }
+
+
+        private void Save(User user)
+        {
+            DataBase db = new DataBase();
+            db.openConnection();
+            string hash = StringUtils.SecureStringToString(user.PasswordHash);
+            string sql = $" INSERT INTO `usrs` (`login`, `password_hash`) VALUES ('{user.Login}','{hash}') " +
+                $"ON DUPLICATE KEY UPDATE `password_hash`='{hash}'";
+            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
+            cmd.ExecuteNonQuery();
+            db.closeConnection();
+        }
+
+
+        public override void Save()
+        {
+            foreach(User user in _data.Values)
+            {
+                Save(user);
+            }
+        }
+    }
+}