Переделал. Начало пагинации положено. Криво, но все таки

.idea/.idea.BathHouseManagmet/.idea/avalonia.xml

@@ -3,7 +3,9 @@
   <component name="AvaloniaProject">
     <option name="projectPerEditor">
       <map>
+        <entry key="App.axaml" value="BathHouseManagmet.csproj" />
         <entry key="Views/MainWindow.axaml" value="BathHouseManagmet.csproj" />
+        <entry key="Views/OrderView.axaml" value="BathHouseManagmet.csproj" />
       </map>
     </option>
   </component>

App.axaml

@@ -11,5 +11,6 @@
   
     <Application.Styles>
         <FluentTheme />
+        <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml"/>
     </Application.Styles>
 </Application>

Database/DatabaseConnection.cs

@@ -1,6 +0,0 @@
-namespace BathHouseManagmet.Database;
-
-public class DatabaseConnection
-{
-    public string ConnectionString { get; set; }
-}

Database/OrderRepository.cs

@@ -1,167 +0,0 @@
-using System;
-using System.Collections.Generic;
-using BathHouseManagmet.Models;
-using Microsoft.Extensions.Options;
-using MySqlConnector;
-
-namespace BathHouseManagmet.Database;
-
-public class OrderRepository
-{
-    MySqlConnection connection;
-
-    public OrderRepository(IOptions<DatabaseConnection> connect)
-    {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
-    }
-
-    public List<Order> GetOrders()
-    {
-        List<Order> result = new();
-        string sql = "select o.id as oid, o.client_id as ocid, o.employee_id as eid, o.discount_id as did, o.service_id as sid, o.zone_id as zid, c.name as cname, c.surname as csurname, o.order_time as otime, e.name as ename, e.surname as esurname, d.name as dname, s.name as sname, z.name as zname from `order` o join client c on o.client_id = c.id join employee e on o.employee_id = e.id join discount d on o.discount_id = d.id join service s on o.service_id = s.id join zone z on  o.zone_id = z.id \n";
-        try
-        {
-            connection.Open();
-            using (var command = new MySqlCommand(sql, connection))
-            using (var reader = command.ExecuteReader())
-            {
-                while (reader.Read())
-                {
-                    result.Add(new Order
-                    {
-                        /*
-                        Id = reader.GetInt32("id"),
-                        ClientId = reader.GetInt32("client_id"),
-                        ZoneId =  reader.GetInt32("zone_id"),
-                        OrderDate = reader.GetDateTime("order_date"),
-                        ServiceId =  reader.GetInt32("service_id"),
-                        EmployeeId = reader.GetInt32("employee_id"),
-                        DiscountId = reader.GetInt32("discount_id"),
-                        FinalPrice = reader.GetInt32("final_price"),
-                        */
-                        Client = new Client()
-                        {
-                            Id = reader.GetInt32("ocid"),
-                            Name = reader.GetString("cname"),
-                            Surname = reader.GetString("csurname"),
-                        },
-                        
-                        Employee = new Employee()
-                        {
-                            Id = reader.GetInt32("eid"),
-                            Name = reader.GetString("ename"),
-                            Surname = reader.GetString("esurname"),
-                        },
-                        
-                        Discount = new Discount()
-                        {
-                            Id = reader.GetInt32("did"),
-                            Name = reader.GetString("dname"),
-                        },
-                        
-                        Zone = new Zone()
-                        {
-                            Id = reader.GetInt32("zid"),
-                            Name = reader.GetString("zname"),
-                        },
-                        
-                        Service =  new Service()
-                        {
-                            Id = reader.GetInt32("sid"),
-                            Name = reader.GetString("sname"),
-                        },
-                        FinalPrice = reader.GetInt32("final_price"),
-                        OrderDate = reader.GetDateTime("order_date"),
-                        Id = reader.GetInt32("oid"),
-                        
-                    });
-                }
-            }
-            connection.Close();
-        }
-        catch (Exception e)
-        {
-            Console.WriteLine(e);
-        }
-        return result;
-    }
-
-    public bool InsertOrder(Order order)
-    {
-        string sql =
-            "insert into `order` (`id`, `client_id`, `zone_id`, `order_date`, `service_id`, `employee_id`, `discount_id`, `final_price`) values (0, @client_id, @client_id, @zone_id, @order_date, @service_id, @employee_id, @discount_id, @final_price)";
-        try
-        {
-            connection.Open();
-            using (var command = new MySqlCommand(sql, connection))
-            {
-                command.Parameters.AddWithValue("@client_id", order.ClientId);
-                command.Parameters.AddWithValue("@zone_id", order.ZoneId);
-                command.Parameters.AddWithValue("@order_date", order.OrderDate);
-                command.Parameters.AddWithValue("@service_id", order.ServiceId);
-                command.Parameters.AddWithValue("@employee_id", order.EmployeeId);
-                command.Parameters.AddWithValue("@discount_id", order.DiscountId);
-                command.Parameters.AddWithValue("@final_price", order.FinalPrice);
-                command.ExecuteNonQuery();
-            }
-            connection.Close();
-        }
-        catch (Exception e)
-        {
-            connection.Close();
-            return false;
-        }
-        connection.Close();
-        return true;
-    }
-
-    public bool UpdateOrder(Order order)
-    {
-        string sql = 
-            "update `order` set client_id = @client_id, zone_id = @zone_id, order_date = @order_date, service_id = @service_id, employee_id = @employee_id, discount_id = @discount_id, final_price = @final_price";
-        try
-        {
-            connection.Open();
-            using (var command = new MySqlCommand(sql, connection))
-            {
-                command.Parameters.AddWithValue("@client_id", order.ClientId);
-                command.Parameters.AddWithValue("@zone_id", order.ZoneId);
-                command.Parameters.AddWithValue("@order_date", order.OrderDate);
-                command.Parameters.AddWithValue("@service_id", order.ServiceId);
-                command.Parameters.AddWithValue("@employee_id", order.EmployeeId);
-                command.Parameters.AddWithValue("@discount_id", order.DiscountId);
-                command.Parameters.AddWithValue("@final_price", order.FinalPrice);
-                command.ExecuteNonQuery();
-            }
-            connection.Close();
-        }
-        catch (Exception e)
-        {
-            connection.Close();
-            return false;
-        }
-        connection.Close();
-        return true;
-    }
-
-    public bool DeleteOrder(Order order)
-    {
-        string sql = "delete from `order` where `id` = " + order.Id;
-        try
-        {
-            connection.Open();
-            using (var command = new MySqlCommand(sql, connection))
-            {
-                command.ExecuteNonQuery();
-            }
-            connection.Close();
-        }
-        catch (Exception e)
-        {
-            connection.Close();
-            return false;
-        }
-        connection.Close();
-        return true;
-    }
-}

Models/Database/BaseRepository.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using BathHouseManagmet.Models.Interfaces;
+using MySqlConnector;
+
+namespace BathHouseManagmet.Models.Database;
+
+public abstract class BaseRepository<T> : IDisposable, IRepository<T> where T : class
+{
+    public abstract List<T> GetPage(int pageNumber, int pageSize);
+    public abstract bool Add(T entity);
+    public abstract bool Update(T entity);
+    public abstract bool Delete(T entity);
+
+    protected MySqlConnection connection;
+
+    public BaseRepository()
+    {
+        string connectionString = "server=localhost;user=root;password=root;database=bathhouse";
+        connection = new MySqlConnection(connectionString);
+    }
+
+    public bool OpenConnection()
+    {
+        try
+        {
+            connection.Open();
+            return true;
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return false;
+        }
+    }
+
+    public bool CloseConnection()
+    {
+        try
+        {
+            connection.Close();
+            return true;
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return false;
+        }
+    }
+
+    public bool ExecuteNonQuery(string query)
+    {
+        using var cmd = new MySqlCommand(query, connection);
+        return cmd.ExecuteNonQuery() > 0;
+    }
+
+    public void Dispose()
+    {
+        connection.Dispose();
+    }
+}

Models/Database/ClientRepository.cs

@@ -1,41 +1,38 @@
 using System;
 using System.Collections.Generic;
 using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
 using Microsoft.Extensions.Options;
 using MySqlConnector;
 
 namespace BathHouseManagmet.Database;
 
-public class ClientRepository
+public class ClientRepository : BaseRepository<Client>, IDisposable
 {
-    MySqlConnection connection;
+    public ClientRepository()
-
-    public ClientRepository(IOptions<DatabaseConnection> connect)
     {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
+        OpenConnection();
     }
-
+    
-    public List<Client> GetClients()
+    public override List<Client> GetPage(int pageNumber, int pageSize)
     {
         List<Client> result = new();
-        string sql = "select * from `client`";
+        string sql = "select * from `client` limit @limit offset @offset";
         try
         {
-            connection.Open();
+            using var command = new MySqlCommand(sql, connection);
-            using(var command = new MySqlCommand(sql, connection))
+            command.Parameters.AddWithValue("@limit", pageNumber);
-            using (var reader = command.ExecuteReader())
+            command.Parameters.AddWithValue("@offset", pageNumber * pageSize);
+            using var reader = command.ExecuteReader();
+            while (reader.Read())
             {
-                while (reader.Read())
+                result.Add(new Client
                 {
-                    result.Add(new Client
+                    Id = reader.GetInt32("id"),
-                    {
+                    Name = reader.GetString("name"),
-                        Id = reader.GetInt32("id"),
+                    Surname = reader.GetString("surname"),
-                        Name = reader.GetString("name"),
+                });
-                        Surname = reader.GetString("surname"),
-                    });
-                }
             }
-            connection.Close();
         }
         catch (Exception e)
         {
@@ -44,12 +41,11 @@ public class ClientRepository
         return result;
     }
 
-    public bool InsertClient(Client client)
+    public override bool Add(Client client)
     {
         string sql = "insert into `client` (`id`, `name`, `surname`) values (0, @name, @surname)";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", client.Name);
@@ -59,42 +55,37 @@ public class ClientRepository
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool UpdateClient(Client client)
+    public override bool Update(Client client)
     {
         string sql = "update `client` set name = @name, surname = @surname";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", client.Name);
                 command.Parameters.AddWithValue("@surname", client.Surname);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool DeleteClient(Client client)
+    public override bool Delete(Client client)
     {
         string sql = "delete from `client` where `id` = " + client.Id;
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.ExecuteNonQuery();
@@ -102,10 +93,30 @@ public class ClientRepository
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
+
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `client`";
+        try
+        {
+            using var command = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(command.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
 }

Models/Database/DiscountRepository.cs

@@ -1,42 +1,38 @@
 using System;
 using System.Collections.Generic;
 using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
 using Microsoft.Extensions.Options;
+using Microsoft.VisualBasic;
 using MySqlConnector;
 
 namespace BathHouseManagmet.Database;
 
-public class DiscountRepository
+public class DiscountRepository : BaseRepository<Discount>, IDisposable
 {
-    MySqlConnection connection;
+    public DiscountRepository()
-
-    public DiscountRepository(IOptions<DatabaseConnection> connect)
     {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
+        OpenConnection();
     }
-
+    
-    public List<Discount> GetDiscounts()
+    public override List<Discount> GetPage(int pageNumber, int pageSize)
     {
         List<Discount> result = new();
-        string sql = "select * from `discount`";
+        string sql = "select * from `discount` limit @limit offset @offset";
         try
         {
-            connection.Open();
+            using var command = new MySqlCommand(sql, connection);
-            using (var command = new MySqlCommand(sql, connection))
+            using var reader = command.ExecuteReader();
-            using (var reader = command.ExecuteReader())
+            while (reader.Read())
             {
-                while (reader.Read())
+                result.Add(new Discount
                 {
-                    result.Add(new Discount
+                    Id = reader.GetInt32("id"),
-                    {
+                    Name = reader.GetString("name"),
-                        Id = reader.GetInt32("id"),
+                    Description = reader.GetString("description"),
-                        Name = reader.GetString("name"),
+                    DiscountPercent =  reader.GetInt32("discount_percent")
-                        Description = reader.GetString("description"),
+                });
-                        DiscountPercent =  reader.GetInt32("discount_percent")
-                    });
-                }
             }
-            connection.Close();
         }
         catch (Exception e)
         {
@@ -45,13 +41,12 @@ public class DiscountRepository
         return result;
     }
 
-    public bool InsertDiscount(Discount discount)
+    public override bool Add(Discount discount)
     {
         string sql = 
             "insert into `discount` (`id`, `name`, `description`, `discount_percent`) values (0, @name, @description, @discount_percent)";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@id", discount.Id);
@@ -59,24 +54,21 @@ public class DiscountRepository
                 command.Parameters.AddWithValue("@description", discount.Description);
                 command.Parameters.AddWithValue("@discount_percent", discount.DiscountPercent);
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return false;
     }
-    
+
-    public bool UpdateDiscount(Discount discount)
+    public override bool Update(Discount discount)
     {
         string sql = 
             "update `discount` set name = @name, description = @description, discount_percent = @discount_percent";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@id", discount.Id);
@@ -84,35 +76,51 @@ public class DiscountRepository
                 command.Parameters.AddWithValue("@description", discount.Description);
                 command.Parameters.AddWithValue("@discount_percent", discount.DiscountPercent);
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return false;
     }
 
-    public bool DeleteDiscount(Discount discount)
+    public override bool Delete(Discount discount)
     {
         string sql = "delete from `discount` where `id` = " + discount.Id;
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
+
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `discount`";
+        try
+        {
+            using var command = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(command.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
 }

Models/Database/EmployeeRepository.cs

@@ -1,27 +1,25 @@
 using System;
 using System.Collections.Generic;
 using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
 using Microsoft.Extensions.Options;
 using MySqlConnector;
 
 namespace BathHouseManagmet.Database;
 
-public class EmployeeRepository
+public class EmployeeRepository : BaseRepository<Employee>, IDisposable
 {
-    MySqlConnection connection;
+    public EmployeeRepository()
-
-    public EmployeeRepository(IOptions<DatabaseConnection> connect)
     {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
+        OpenConnection();
     }
-
+    
-    public List<Employee> GetEmployees()
+    public override List<Employee> GetPage(int pageNumber, int pageSize)
     {
         List<Employee> result = new();
-        string sql = "select e.id as eid, e.position_id as pid, e.name as ename, e.surname as esurname, p.name as pname from employee e join position p on e.position_id = p.id";
+        string sql = "select e.id as eid, e.position_id as pid, e.name as ename, e.surname as esurname, p.name as pname from employee e join position p on e.position_id = p.id limit @limit offset @offset";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             using (var reader = command.ExecuteReader())
             {
@@ -29,12 +27,6 @@ public class EmployeeRepository
                 {
                     result.Add(new Employee
                     {
-                        /*
-                        Id = reader.GetInt32("id"),
-                        Name = reader.GetString("name"),
-                        Surname = reader.GetString("surname"),
-                        PositionId = reader.GetInt32("position_id"),
-                        */
                         Id = reader.GetInt32("eid"),
                         Name = reader.GetString("ename"),
                         Surname = reader.GetString("esurname"),
@@ -46,7 +38,6 @@ public class EmployeeRepository
                     });
                 }
             }
-            connection.Close();
         }
         catch (Exception e)
         {
@@ -55,13 +46,12 @@ public class EmployeeRepository
         return result;
     }
 
-    public bool InsertEmployee(Employee employee)
+    public override bool Add(Employee employee)
     {
         string sql =
             "insert into `employee` (`id`, `name`, `surname`, `on_work`, `position_id`) values (0, @name, @surname, @on_work, @position_id)";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", employee.Name);
@@ -69,23 +59,20 @@ public class EmployeeRepository
                 command.Parameters.AddWithValue("@position_id", employee.PositionId);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool UpdateEmployee(Employee employee)
+    public override bool Update(Employee employee)
     {
         string sql = "update `employee` set name = @name, surname = @surname, on_work = @on_work, position_id = @position_id";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", employee.Name);
@@ -93,35 +80,51 @@ public class EmployeeRepository
                 command.Parameters.AddWithValue("@position_id", employee.PositionId);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool DeleteEmployee(Employee employee)
+    public override bool Delete(Employee employee)
     {
         string sql = "delete from `employee` where `id` = " + employee.Id;
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
+
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `employee`";
+        try
+        {
+            using var command = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(command.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
 }

Models/Database/OrderRepository.cs

@@ -0,0 +1,174 @@
+using System;
+using System.Collections.Generic;
+using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
+using BathHouseManagmet.Models.Interfaces;
+using Microsoft.Extensions.Options;
+using MySqlConnector;
+
+namespace BathHouseManagmet.Database;
+
+public class OrderRepository : BaseRepository<Order>, IDisposable
+{
+    public OrderRepository()
+    {
+        OpenConnection();
+    }
+
+    public override List<Order> GetPage(int pageNumber, int pageSize)
+    {
+        List<Order> result = new();
+        string sql =
+            "select o.id as oid, o.client_id as ocid, o.employee_id as eid, o.discount_id as did, o.service_id as sid, o.zone_id as zid, c.name as cname, c.surname as csurname, o.order_time as otime, e.name as ename, e.surname as esurname, d.name as dname, s.name as sname, z.name as zname from `order` o join client c on o.client_id = c.id join employee e on o.employee_id = e.id join discount d on o.discount_id = d.id join service s on o.service_id = s.id join zone z on  o.zone_id = z.id limit @limit offset @offset";
+        try
+        {
+            using var command = new MySqlCommand(sql, connection);
+            command.Parameters.AddWithValue("@limit", pageNumber);
+            command.Parameters.AddWithValue("@offset", pageNumber * pageSize);
+            using var reader = command.ExecuteReader();
+            while (reader.Read())
+            {
+                result.Add(new Order
+                {
+
+                    Client = new Client()
+                    {
+                        Id = reader.GetInt32("ocid"),
+                        Name = reader.GetString("cname"),
+                        Surname = reader.GetString("csurname"),
+                    },
+
+                    Employee = new Employee()
+                    {
+                        Id = reader.GetInt32("eid"),
+                        Name = reader.GetString("ename"),
+                        Surname = reader.GetString("esurname"),
+                    },
+
+                    Discount = new Discount()
+                    {
+                        Id = reader.GetInt32("did"),
+                        Name = reader.GetString("dname"),
+                    },
+
+                    Zone = new Zone()
+                    {
+                        Id = reader.GetInt32("zid"),
+                        Name = reader.GetString("zname"),
+                    },
+
+                    Service = new Service()
+                    {
+                        Id = reader.GetInt32("sid"),
+                        Name = reader.GetString("sname"),
+                    },
+                    FinalPrice = reader.GetInt32("final_price"),
+                    OrderDate = reader.GetDateTime("order_date"),
+                    Id = reader.GetInt32("oid"),
+
+                });
+            }
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+        }
+
+        return result;
+    }
+
+    public override bool Add(Order order)
+    {
+        string sql =
+            "insert into `order` (`id`, `client_id`, `zone_id`, `order_date`, `service_id`, `employee_id`, `discount_id`, `final_price`) values (0, @client_id, @client_id, @zone_id, @order_date, @service_id, @employee_id, @discount_id, @final_price)";
+        try
+        {
+            using (var command = new MySqlCommand(sql, connection))
+            {
+                command.Parameters.AddWithValue("@client_id", order.ClientId);
+                command.Parameters.AddWithValue("@zone_id", order.ZoneId);
+                command.Parameters.AddWithValue("@order_date", order.OrderDate);
+                command.Parameters.AddWithValue("@service_id", order.ServiceId);
+                command.Parameters.AddWithValue("@employee_id", order.EmployeeId);
+                command.Parameters.AddWithValue("@discount_id", order.DiscountId);
+                command.Parameters.AddWithValue("@final_price", order.FinalPrice);
+                command.ExecuteNonQuery();
+            }
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return false;
+        }
+
+        return true;
+    }
+
+    public override bool Update(Order order)
+    {
+        string sql =
+            "update `order` set client_id = @client_id, zone_id = @zone_id, order_date = @order_date, service_id = @service_id, employee_id = @employee_id, discount_id = @discount_id, final_price = @final_price";
+        try
+        {
+            connection.Open();
+            using (var command = new MySqlCommand(sql, connection))
+            {
+                command.Parameters.AddWithValue("@client_id", order.ClientId);
+                command.Parameters.AddWithValue("@zone_id", order.ZoneId);
+                command.Parameters.AddWithValue("@order_date", order.OrderDate);
+                command.Parameters.AddWithValue("@service_id", order.ServiceId);
+                command.Parameters.AddWithValue("@employee_id", order.EmployeeId);
+                command.Parameters.AddWithValue("@discount_id", order.DiscountId);
+                command.Parameters.AddWithValue("@final_price", order.FinalPrice);
+                command.ExecuteNonQuery();
+            }
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return false;
+        }
+
+        return true;
+    }
+
+    public override bool Delete(Order order)
+    {
+        string sql = "delete from `order` where `id` = " + order.Id;
+        try
+        {
+            using (var command = new MySqlCommand(sql, connection))
+            {
+                command.ExecuteNonQuery();
+            }
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return false;
+        }
+
+        return true;
+    }
+
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `order`";
+        try
+        {
+            using var mc = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(mc.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+    
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
+}

Models/Database/PositionRepository.cs

@@ -1,40 +1,37 @@
 using System;
 using System.Collections.Generic;
 using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
 using Microsoft.Extensions.Options;
 using MySqlConnector;
 
 namespace BathHouseManagmet.Database;
 
-public class PositionRepository
+public class PositionRepository : BaseRepository<Position>, IDisposable
 {
-    MySqlConnection connection;
+    public PositionRepository()
-
-    public PositionRepository(IOptions<DatabaseConnection> connect)
     {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
+        OpenConnection();
     }
-
+    
-    public List<Position> GetPositions()
+    public override List<Position> GetPage(int pageNumber, int pageSize)
     {
         List<Position> result = new();
-        string sql = "select * from `position`";
+        string sql = "select * from `position` limit @limit offset @offset";
         try
         {
-            connection.Open();
+            using var command = new MySqlCommand(sql, connection);
-            using (var command = new MySqlCommand(sql, connection))
+            command.Parameters.AddWithValue("@limit", pageNumber);
-            using (var reader = command.ExecuteReader())
+            command.Parameters.AddWithValue("@offset", pageNumber * pageSize);
+            using var reader = command.ExecuteReader();
+            while (reader.Read())
             {
-                while (reader.Read())
+                result.Add(new Position
                 {
-                    result.Add(new Position
+                    Id = reader.GetInt32("id"),
-                    {
+                    Name = reader.GetString("name"),
-                        Id = reader.GetInt32("id"),
+                });
-                        Name = reader.GetString("name"),
-                    });
-                }
             }
-            connection.Close();
         }
         catch (Exception e)
         {
@@ -43,69 +40,81 @@ public class PositionRepository
         return result;
     }
 
-    public bool InsertPositon(Position position)
+    public override bool Add(Position position)
     {
         string sql = "insert into `position` (`id`, `name`) values (0, @name)";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@id", position.Id);
                 command.Parameters.AddWithValue("@name", position.Name);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool UpdatePositon(Position position)
+    public override bool Update(Position position)
     {
         string sql = "update `position` set name = @name";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", position.Name);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool DeletePositon(Position position)
+    public override bool Delete(Position position)
     {
         string sql = "delete from `position` where `id` = " + position.Id;
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
+
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `position`";
+        try
+        {
+            using var command = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(command.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+    
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
 }

Models/Database/ServiceRepository.cs

@@ -1,42 +1,39 @@
 using System;
 using System.Collections.Generic;
 using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
 using Microsoft.Extensions.Options;
 using MySqlConnector;
 
 namespace BathHouseManagmet.Database;
 
-public class ServiceRepository
+public class ServiceRepository : BaseRepository<Service>, IDisposable
 {
-    MySqlConnection connection;
+    public ServiceRepository()
-
-    public ServiceRepository(IOptions<DatabaseConnection> connect)
     {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
+        OpenConnection();
     }
-
+    
-    public List<Service> GetServices()
+    public override List<Service> GetPage(int pageNumber, int pageSize)
     {
         List<Service> result = new();
-        string sql = "select * from `service`";
+        string sql = "select * from `service` limit @limit offset @offset";
         try
         {
-            connection.Open();
+            using var command = new MySqlCommand(sql, connection);
-            using (var command = new MySqlCommand(sql, connection))
+            command.Parameters.AddWithValue("@limit", pageNumber);
-            using (var reader = command.ExecuteReader())
+            command.Parameters.AddWithValue("@offset", pageNumber * pageSize);
+            using var reader = command.ExecuteReader();
+            while (reader.Read())
             {
-                while (reader.Read())
+                result.Add(new Service
                 {
-                    result.Add(new Service
+                    Id = reader.GetInt32("id"),
-                    {
+                    Name = reader.GetString("name"),
-                        Id = reader.GetInt32("id"),
+                    Description = reader.GetString("description"),
-                        Name = reader.GetString("name"),
+                    Price = reader.GetInt32("price")
-                        Description = reader.GetString("description"),
+                });
-                        Price = reader.GetInt32("price")
-                    });
-                }
             }
-            connection.Close();
         }
         catch (Exception e)
         {
@@ -45,12 +42,11 @@ public class ServiceRepository
         return result;
     }
 
-    public bool InsertService(Service service)
+    public override bool Add(Service service)
     {
         string sql = "insert into `service` (`id`, `name`, `description`, `price`) values (0, @name, @description, @price)";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@id", service.Id);
@@ -59,23 +55,20 @@ public class ServiceRepository
                 command.Parameters.AddWithValue("@price", service.Price);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool UpdateService(Service service)
+    public override bool Update(Service service)
     {
         string sql = "update `service` set name = @name, description = @description, price = @price";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", service.Name);
@@ -83,35 +76,51 @@ public class ServiceRepository
                 command.Parameters.AddWithValue("@price", service.Price);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool DeleteService(Service service)
+    public override bool Delete(Service service)
     {
         string sql = "delete from `service` where `id` =" + service.Id;
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
-}
+    
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `service`";
+        try
+        {
+            using var mc = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(mc.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+    
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
+}

Models/Database/ZoneRepository.cs

@@ -1,40 +1,37 @@
 using System;
 using System.Collections.Generic;
 using BathHouseManagmet.Models;
+using BathHouseManagmet.Models.Database;
 using Microsoft.Extensions.Options;
 using MySqlConnector;
 
 namespace BathHouseManagmet.Database;
 
-public class ZoneRepository
+public class ZoneRepository : BaseRepository<Zone>, IDisposable
 {
-    MySqlConnection connection;
+    public ZoneRepository()
-
-    public ZoneRepository(IOptions<DatabaseConnection> connect)
     {
-        connection = new MySqlConnection(connect.Value.ConnectionString);
+        OpenConnection();
     }
-
+    
-    public List<Zone> GetZones()
+    public override List<Zone> GetPage(int pageNumber, int pageSize)
     {
         List<Zone> result = new();
-        string sql = "select * from zone";
+        string sql = "select * from zone limit @limit offset @offset";
         try
         {
-            connection.Open();
+            using var command = new MySqlCommand(sql, connection);
-            using (var command = new MySqlCommand(sql, connection))
+            command.Parameters.AddWithValue("@limit", pageNumber);
-            using (var reader = command.ExecuteReader())
+            command.Parameters.AddWithValue("@offset", pageNumber * pageSize);
+            using var reader = command.ExecuteReader();
+            while (reader.Read())
             {
-                while (reader.Read())
+                result.Add(new Zone
                 {
-                    result.Add(new Zone
+                    Id = reader.GetInt32("id"),
-                    {
+                    Name = reader.GetString("name"),
-                        Id = reader.GetInt32("id"),
+                });
-                        Name = reader.GetString("name"),
-                    });
-                }
             }
-            connection.Close();
         }
         catch (Exception e)
         {
@@ -43,68 +40,80 @@ public class ZoneRepository
         return result;
     }
 
-    public bool InsertZone(Zone zone)
+    public override bool Add(Zone zone)
     {
         string sql = "insert into `zone` (`id`, `name`) values (0, @name)";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", zone.Name);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool UpdateZone(Zone zone)
+    public override bool Update(Zone zone)
     {
         string sql = "update `zone` set name = @name";
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.Parameters.AddWithValue("@name", zone.Name);
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
 
-    public bool DeleteZone(Zone zone)
+    public override bool Delete(Zone zone)
     {
         string sql = "delete from `zone` where id = " +  zone.Id;
         try
         {
-            connection.Open();
             using (var command = new MySqlCommand(sql, connection))
             {
                 command.ExecuteNonQuery();
             }
-            connection.Close();
         }
         catch (Exception e)
         {
-            connection.Close();
+            Console.WriteLine(e);
             return false;
         }
-        connection.Close();
         return true;
     }
+
+    public int GetRowsCount()
+    {
+        string sql = "select count(id) from `zone`";
+        try
+        {
+            using var mc = new MySqlCommand(sql, connection);
+            return Convert.ToInt32(mc.ExecuteScalar());
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            return 0;
+        }
+    }
+    
+    public void Dispose()
+    {
+        CloseConnection();
+        base.Dispose();
+    }
 }

Models/Interfaces/IRepository.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace BathHouseManagmet.Models.Interfaces;
+
+public interface IRepository<T> where T : class
+{
+    List<T> GetPage(int pageNumber, int pageSize);
+    bool Add(T entity);
+    bool Update(T entity);
+    bool Delete(T entity);
+}

Program.cs

@@ -17,20 +17,21 @@ sealed class Program
     [STAThread]
     public static void Main(string[] args)
     {
-        var host = Host.CreateDefaultBuilder().ConfigureAppConfiguration((context, config) =>
+        var host = Host.CreateDefaultBuilder()
+            .ConfigureServices((c, s) =>
         {
-            config.SetBasePath(AppContext.BaseDirectory).AddJsonFile("appsettings.json").AddEnvironmentVariables();
-        }).ConfigureServices((c, s) =>
-        {
-            s.Configure<DatabaseConnection>(c.Configuration.GetSection("DatabaseConnection"));
             s.AddTransient<MainWindow>();
             s.AddTransient<MainWindowViewModel>();
+            s.AddTransient<OrderViewModel>();
+            s.AddTransient<OrderView>();
+            
             s.AddTransient<DiscountRepository>();
             s.AddTransient<ClientRepository>();
             s.AddTransient<EmployeeRepository>();
             s.AddTransient<OrderRepository>();
             s.AddTransient<PositionRepository>();
             s.AddTransient<ZoneRepository>();
+            s.AddTransient<ServiceRepository>();
         }).Build();
         BuildAvaloniaApp(host.Services)
             .StartWithClassicDesktopLifetime(args);

ViewModels/MainWindowViewModel.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using BathHouseManagmet.Database;
 using BathHouseManagmet.Models;
 using CommunityToolkit.Mvvm.ComponentModel;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace BathHouseManagmet.ViewModels;
 
@@ -11,7 +12,9 @@ public partial class MainWindowViewModel : ViewModelBase
     private readonly IServiceProvider _serviceProvider;
     private readonly EmployeeRepository _employeeRepository;
     private readonly OrderRepository _orderRepository;
-    
+
+    [ObservableProperty] OrderViewModel _orderViewModel;
+
     [ObservableProperty] List<Order> orders;
     [ObservableProperty] List<Employee> employees;
 
@@ -21,7 +24,6 @@ public partial class MainWindowViewModel : ViewModelBase
         _employeeRepository = employeeRepository;
         _orderRepository = orderRepository;
 
-        Employees = employeeRepository.GetEmployees();
+        OrderViewModel = _serviceProvider.GetRequiredService<OrderViewModel>();
-        Orders = orderRepository.GetOrders();
     }
 }

ViewModels/OrderViewModel.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using BathHouseManagmet.Database;
+using BathHouseManagmet.Models;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace BathHouseManagmet.ViewModels;
+
+public partial class OrderViewModel : ViewModelBase
+{
+    private readonly IServiceProvider _serviceProvider;
+    private readonly OrderRepository _repository;
+
+    [ObservableProperty] private int _currentPageSize;
+    [ObservableProperty] private List<int> _pageSizes;
+    [ObservableProperty] private string _pageInfo;
+    private int currentPage = 0;
+    private int totalPages;
+    
+    [ObservableProperty] List<Order> orders;
+
+    public OrderViewModel(IServiceProvider serviceProvider, OrderRepository repository)
+    {
+        _serviceProvider = serviceProvider;
+        _repository = repository;
+        
+        PageSizes = new List<int>([5,10,20]);
+        CurrentPageSize = PageSizes.First();
+    }
+
+    partial void OnCurrentPageSizeChanged(int value)
+    {
+        CalculatePages();
+    }
+
+    void CalculatePages()
+    {
+        using var db = new OrderRepository();
+        var rowsCount = db.GetRowsCount();
+        totalPages = (int)Math.Ceiling(((double)rowsCount / CurrentPageSize));
+        ShowFirstPage();
+    }
+
+    void ShowPage(int pageIndex)
+    {
+        currentPage = pageIndex;
+        using var db = new OrderRepository();
+        Orders.Clear();
+        var rows = db.GetPage(pageIndex, CurrentPageSize);
+        rows.ForEach(o => Orders.Add(o));
+        PageInfo = $"Страница {currentPage + 1} из {totalPages}";
+    }
+    
+    [RelayCommand]
+    private void ShowFirstPage()
+    {
+        ShowPage(0);
+    }
+
+    [RelayCommand]
+    private void ShowLastPage()
+    {
+        ShowPage(totalPages - 1);
+    }
+
+    [RelayCommand]
+    private void ShowNextPage()
+    {
+        if (currentPage < totalPages - 1)
+            ShowPage(currentPage + 1);
+    }
+
+    [RelayCommand]
+    private void ShowPreviousPage()
+    {
+        if (currentPage > 0)
+            ShowPage(currentPage - 1);
+    }
+}

Views/MainWindow.axaml

@@ -13,18 +13,7 @@
                         <TabItem Header="Основная информация">
                                 <TabControl TabStripPlacement="Top">
                                         <TabItem Header="Заказы">
-                                                <DataGrid ItemsSource="{Binding Orders}" AutoGenerateColumns="False">
+                                                <ContentControl Content="{Binding OrderViewModel}"/>
-                                                        <DataGrid.Columns>
-                                                                <DataGridTextColumn Header="Дата заказа" Binding="{Binding OrderDate}"/>
-                                                                <DataGridTextColumn Header="Имя клиента" Binding="{Binding Client.Name}"/>
-                                                                <DataGridTextColumn Header="Фамилия клиента" Binding="{Binding Client.Name}"/>
-                                                                <DataGridTextColumn Header="Название услуги" Binding="{Binding Service.Name}"/>
-                                                                <DataGridTextColumn Header="Имя сотрудника" Binding="{Binding Employee.Name}"/>
-                                                                <DataGridTextColumn Header="Фамилия сотрудника" Binding="{Binding Employee.Surname}"/>
-                                                                <DataGridTextColumn Header="Название зоны" Binding="{Binding Zone.Name}"/>
-                                                                <DataGridTextColumn Header="Окончательная цена" Binding="{Binding FinalPrice}"/>
-                                                        </DataGrid.Columns>
-                                                </DataGrid>
                                         </TabItem>
                                         <TabItem Header="Сотрудники">
                                                 <DataGrid ItemsSource="{Binding Employees}" AutoGenerateColumns="False">

Views/OrderView.axaml

@@ -0,0 +1,21 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:viewModels="clr-namespace:BathHouseManagmet.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="BathHouseManagmet.Views.OrderView"
+             x:DataType="viewModels:OrderViewModel">
+    <DataGrid ItemsSource="{Binding Orders}" AutoGenerateColumns="False">
+        <DataGrid.Columns>
+            <DataGridTextColumn Header="Дата заказа" Binding="{Binding OrderDate}"/>
+            <DataGridTextColumn Header="Имя клиента" Binding="{Binding Client.Name}"/>
+            <DataGridTextColumn Header="Фамилия клиента" Binding="{Binding Client.Name}"/>
+            <DataGridTextColumn Header="Название услуги" Binding="{Binding Service.Name}"/>
+            <DataGridTextColumn Header="Имя сотрудника" Binding="{Binding Employee.Name}"/>
+            <DataGridTextColumn Header="Фамилия сотрудника" Binding="{Binding Employee.Surname}"/>
+            <DataGridTextColumn Header="Название зоны" Binding="{Binding Zone.Name}"/>
+            <DataGridTextColumn Header="Окончательная цена" Binding="{Binding FinalPrice}"/>
+        </DataGrid.Columns>
+    </DataGrid>
+</UserControl>

Views/OrderView.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace BathHouseManagmet.Views;
+
+public partial class OrderView : UserControl
+{
+    public OrderView()
+    {
+        InitializeComponent();
+    }
+}

obj/Debug/net10.0/Avalonia/Resources.Inputs.cache

@@ -1 +1 @@
-4ca19c68a0eed00c6c98dc17b5c4df148d4bff7244cb64327babf21594ee2313
+1192b891a192d7b26b551ab7706358bedb3321507bd7d8cf1bfa07c8d52271f9

obj/Debug/net10.0/BathHouseManagmet.AssemblyInfo.cs

@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("BathHouseManagmet")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+4e1ab770f1b973c62387290bf8e7c9407bc2cd2a")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+41512c28ef3f00e1a5bf2e8fff2eb768a98ef1bf")]
 [assembly: System.Reflection.AssemblyProductAttribute("BathHouseManagmet")]
 [assembly: System.Reflection.AssemblyTitleAttribute("BathHouseManagmet")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

obj/Debug/net10.0/BathHouseManagmet.AssemblyInfoInputs.cache

@@ -1 +1 @@
-f47cb2fe8a4221890c3e523f6ef8a05ece1d4ec0d2150086183c9d3e4a5ddd93
+eabbb29cd12761d77743c612010becd5857837b230f933faa13156f790e78108

obj/Debug/net10.0/BathHouseManagmet.GeneratedMSBuildEditorConfig.editorconfig

@@ -28,3 +28,6 @@ build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml
 
 [C:/Users/Mikhail/RiderProjects/BathHouseManagmet/Views/MainWindow.axaml]
 build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml
+
+[C:/Users/Mikhail/RiderProjects/BathHouseManagmet/Views/OrderView.axaml]
+build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml