diff --git a/ProjectOptika/ProjectOptika.csproj b/ProjectOptika/ProjectOptika.csproj
index accbdf0..8d91237 100644
--- a/ProjectOptika/ProjectOptika.csproj
+++ b/ProjectOptika/ProjectOptika.csproj
@@ -9,7 +9,21 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Dapper" Version="2.1.35" />
+    <PackageReference Include="DocumentFormat.OpenXml" Version="3.2.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="Npgsql" Version="9.0.2" />
+    <PackageReference Include="PdfSharp.MigraDoc.Standard" Version="1.51.15" />
+    <PackageReference Include="Serilog" Version="4.2.0" />
+    <PackageReference Include="Serilog.Extensions.Logging" Version="9.0.0" />
+    <PackageReference Include="Serilog.Settings.Configuration" Version="9.0.0" />
+    <PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.9.0" />
     <PackageReference Include="Unity" Version="5.11.10" />
+    <PackageReference Include="Unity.Microsoft.Logging" Version="5.11.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/ProjectOptika/Scripts/Forms/FormItemOrder.cs b/ProjectOptika/Scripts/Forms/FormItemOrder.cs
index ca19e88..0f46faa 100644
--- a/ProjectOptika/Scripts/Forms/FormItemOrder.cs
+++ b/ProjectOptika/Scripts/Forms/FormItemOrder.cs
@@ -1,7 +1,5 @@
-
-using ProjectOptika.Scripts.Entities;
+using ProjectOptika.Scripts.Entities;
 using ProjectOptika.Scripts.Repositories;
-using ProjectOptika.Scripts.Repositories.Implementations;
 
 namespace ProjectOptika.Scripts.Forms
 {
diff --git a/ProjectOptika/Scripts/Program.cs b/ProjectOptika/Scripts/Program.cs
index ea58915..2c227e4 100644
--- a/ProjectOptika/Scripts/Program.cs
+++ b/ProjectOptika/Scripts/Program.cs
@@ -1,6 +1,10 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
 using ProjectOptika.Scripts.Repositories;
 using ProjectOptika.Scripts.Repositories.Implementations;
+using Serilog;
 using Unity;
+using Unity.Microsoft.Logging;
 
 namespace ProjectOptika.Scripts
 {
@@ -18,8 +22,10 @@ namespace ProjectOptika.Scripts
             Application.Run(CreateContainer().Resolve<FormOptika>());
         }
 
-        private static UnityContainer CreateContainer () {  
-            var container = new UnityContainer ();
+        private static UnityContainer CreateContainer () {
+            var container = new UnityContainer();
+
+            container.AddExtension(new LoggingExtension(CreateLoggerFactory()));
 
             container.RegisterType<IAccessoriesRepository, AccessoriesRepository>();
             container.RegisterType<IClientRepositiory, ClientRepositiory>();
@@ -27,7 +33,21 @@ namespace ProjectOptika.Scripts
             container.RegisterType<ISpecificationsRepository, SpecificationsRepository>();
             container.RegisterType<IOrderRepository, OrderRepository>();
 
+            container.RegisterType<IConnectionString, ConnectionString>();
+
             return container;
         }
+
+        private static LoggerFactory CreateLoggerFactory()
+        {
+            var loggerFactory = new LoggerFactory();
+            loggerFactory.AddSerilog(new LoggerConfiguration()
+            .ReadFrom.Configuration(new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile("appsettings.json")
+            .Build())
+            .CreateLogger());
+            return loggerFactory;
+        }
     }
 }
\ No newline at end of file
diff --git a/ProjectOptika/Scripts/Repositories/IConnectionString.cs b/ProjectOptika/Scripts/Repositories/IConnectionString.cs
new file mode 100644
index 0000000..3467754
--- /dev/null
+++ b/ProjectOptika/Scripts/Repositories/IConnectionString.cs
@@ -0,0 +1,8 @@
+namespace ProjectOptika.Scripts.Repositories
+{
+    public interface IConnectionString
+    {
+        public string ConnectionString { get; }
+    }
+
+}
diff --git a/ProjectOptika/Scripts/Repositories/Implementations/AccessoriesRepository.cs b/ProjectOptika/Scripts/Repositories/Implementations/AccessoriesRepository.cs
index e1e3c1c..115b75d 100644
--- a/ProjectOptika/Scripts/Repositories/Implementations/AccessoriesRepository.cs
+++ b/ProjectOptika/Scripts/Repositories/Implementations/AccessoriesRepository.cs
@@ -1,29 +1,126 @@
-using ProjectOptika.Scripts.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using ProjectOptika.Scripts.Entities;
 
 namespace ProjectOptika.Scripts.Repositories.Implementations
 {
     public class AccessoriesRepository : IAccessoriesRepository
     {
-        public void CreateAccessories(Accessories order)
+        private readonly IConnectionString _connectionString;
+        private readonly ILogger<AccessoriesRepository> _logger;
+
+        public AccessoriesRepository(IConnectionString connectionString, ILogger<AccessoriesRepository> logger)
         {
+            _connectionString = connectionString;
+            _logger = logger;
+        }
+
+        public void CreateAccessories(Accessories accessories)
+        {
+            _logger.LogInformation("Добавление объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(accessories));
+
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryInsert = @"
+            INSERT INTO Accessories (Name, Brand, Cost, StockAvailability, AvailabilityStore, DeliveryDate, CategoryName)
+               VALUES (@Name, @Brand, @Cost, @StockAvailability, @AvailabilityStore, @DeliveryDate, @CategoryName)";
+                connection.Execute(queryInsert, accessories);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при добавлении объекта");
+                throw;
+            }
         }
 
         public void DeleteAccessories(int id)
         {
+            _logger.LogInformation("Удаление объекта");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryDelete = @"
+                DELETE FROM Accessories
+                WHERE ID=@id";
+                connection.Execute(queryDelete, new { id });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при удалении объекта");
+                throw;
+            }
         }
 
         public IEnumerable<Accessories> GetAccessories()
         {
-            return [];
+            _logger.LogInformation("Получение всех объектов");
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = "SELECT * FROM Accessories";
+                var accessory = connection.Query<Accessories>(querySelect);
+                _logger.LogDebug("Полученные объекты: {json}",
+                JsonConvert.SerializeObject(accessory));
+                return accessory;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при чтении объектов");
+                throw;
+            }
         }
 
         public Accessories GetAccessoriesByID(int id)
         {
-            return Accessories.CreateEntity(0, string.Empty, string.Empty, 0, 0, 0, DateTime.Now, 0);
+            _logger.LogInformation("Получение объекта по идентификатору");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = @"
+                SELECT * FROM Accessories
+                WHERE ID=@id";
+                var accessory = connection.QueryFirst<Accessories>(querySelect, new { id });
+                _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(accessory));
+                return accessory;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при поиске объекта");
+                throw;
+            }
         }
 
-        public void UpdateAccessories(Accessories order)
+        public void UpdateAccessories(Accessories accessories)
         {
+            _logger.LogInformation("Редактирование объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(accessories));
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryUpdate = @"
+                UPDATE Accessories
+                SET
+                Name=@Name,
+                Brand=@Brand,
+                Cost=@Cost,
+                StockAvailability=@StockAvailability,
+                AvailabilityStore=@AvailabilityStore,
+                DeliveryDate=@DeliveryDate,
+                CategoryName=@CategoryName
+                WHERE ID=@ID";
+                connection.Execute(queryUpdate, accessories);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при редактировании объекта");
+                throw;
+            }
         }
     }
 }
diff --git a/ProjectOptika/Scripts/Repositories/Implementations/ClientRepositiory.cs b/ProjectOptika/Scripts/Repositories/Implementations/ClientRepositiory.cs
index af70591..b42c0a6 100644
--- a/ProjectOptika/Scripts/Repositories/Implementations/ClientRepositiory.cs
+++ b/ProjectOptika/Scripts/Repositories/Implementations/ClientRepositiory.cs
@@ -1,29 +1,124 @@
-using ProjectOptika.Scripts.Entities;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using ProjectOptika.Scripts.Entities;
+using Dapper;
 
 namespace ProjectOptika.Scripts.Repositories.Implementations
 {
     public class ClientRepositiory : IClientRepositiory
     {
+        private readonly IConnectionString _connectionString;
+        private readonly ILogger<ClientRepositiory> _logger;
+
+        public ClientRepositiory(IConnectionString connectionString, ILogger<ClientRepositiory> logger)
+        {
+            _connectionString = connectionString;
+            _logger = logger;
+        }
+
         public void CreateClient(Client client)
-        {   
+        {
+            _logger.LogInformation("Добавление объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(client));
+
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryInsert = @"
+            INSERT INTO Client (ClientType, FirstName, SecondName, Surname, PhoneNumber)
+               VALUES (@ClientType, @FirstName, @SecondName, @Surname, @PhoneNumber)";
+                connection.Execute(queryInsert, client);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при добавлении объекта");
+                throw;
+            }
         }
 
         public void DeleteClient(int id)
         {
+            _logger.LogInformation("Удаление объекта");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryDelete = @"
+                DELETE FROM Client
+                WHERE ID=@id";
+                connection.Execute(queryDelete, new { id });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при удалении объекта");
+                throw;
+            }
         }
 
         public Client GetClientById(int id)
         {
-            return Client.CreateEntity(0, Entities.Enums.ClientType.Corporate, string.Empty, string.Empty, string.Empty, string.Empty);
+            _logger.LogInformation("Получение объекта по идентификатору");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = @"
+                SELECT * FROM Client
+                WHERE ID=@id";
+                var client = connection.QueryFirst<Client>(querySelect, new { id });
+                _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(client));
+                return client;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при поиске объекта");
+                throw;
+            }
         }
 
         public IEnumerable<Client> GetClients()
         {
-            return [];
+            _logger.LogInformation("Получение всех объектов");
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = "SELECT * FROM Client";
+                var clients = connection.Query<Client>(querySelect);
+                _logger.LogDebug("Полученные объекты: {json}",
+                JsonConvert.SerializeObject(clients));
+                return clients;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при чтении объектов");
+                throw;
+            }
         }
 
         public void UpdateClient(Client client)
         {
+            _logger.LogInformation("Редактирование объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(client));
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryUpdate = @"
+                UPDATE Client
+                SET
+                ClientType=@ClientType,
+                FirstName=@FirstName,
+                SecondName=@SecondName,
+                Surname=@Surname,
+                PhoneNumber=@PhoneNumber
+                WHERE ID=@ID";
+                connection.Execute(queryUpdate, client);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при редактировании объекта");
+                throw;
+            }
         }
     }
 }
diff --git a/ProjectOptika/Scripts/Repositories/Implementations/ConnectionString.cs b/ProjectOptika/Scripts/Repositories/Implementations/ConnectionString.cs
new file mode 100644
index 0000000..73f4006
--- /dev/null
+++ b/ProjectOptika/Scripts/Repositories/Implementations/ConnectionString.cs
@@ -0,0 +1,7 @@
+namespace ProjectOptika.Scripts.Repositories.Implementations
+{
+    internal class ConnectionString : IConnectionString
+    {
+        string IConnectionString.ConnectionString => "Host=localhost;Port=5432;Database=dboptika;Username=postgres;Password=admin";
+    }
+}
diff --git a/ProjectOptika/Scripts/Repositories/Implementations/EmployeeRepository.cs b/ProjectOptika/Scripts/Repositories/Implementations/EmployeeRepository.cs
index 924e738..6ade71a 100644
--- a/ProjectOptika/Scripts/Repositories/Implementations/EmployeeRepository.cs
+++ b/ProjectOptika/Scripts/Repositories/Implementations/EmployeeRepository.cs
@@ -1,29 +1,123 @@
-using ProjectOptika.Scripts.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using ProjectOptika.Scripts.Entities;
 
 namespace ProjectOptika.Scripts.Repositories.Implementations
 {
     public class EmployeeRepository : IEmployeeRepository
     {
+        private readonly IConnectionString _connectionString;
+        private readonly ILogger<EmployeeRepository> _logger;
+
+        public EmployeeRepository(IConnectionString connectionString, ILogger<EmployeeRepository> logger)
+        {
+            _connectionString = connectionString;
+            _logger = logger;
+        }
+
         public void CreateEmployee(Employee employee)
         {
+            _logger.LogInformation("Добавление объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(employee));
+
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryInsert = @"
+            INSERT INTO Employee (PositionEmployee, FirstName, SecondName, Surname)
+               VALUES (@PositionEmployee, @FirstName, @SecondName, @Surname)";
+                connection.Execute(queryInsert, employee);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при добавлении объекта");
+                throw;
+            }
         }
 
         public void DeleteEmployee(int id)
         {
+            _logger.LogInformation("Удаление объекта");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryDelete = @"
+                DELETE FROM Employee
+                WHERE ID=@id";
+                connection.Execute(queryDelete, new { id });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при удалении объекта");
+                throw;
+            }
         }
 
         public Employee GetEmployeerByID(int id)
         {
-            return Employee.CreateEntity(0, Entities.Enums.PositionEmployee.None, string.Empty, string.Empty, string.Empty);
+            _logger.LogInformation("Получение объекта по идентификатору");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = @"
+                SELECT * FROM Employee
+                WHERE ID=@id";
+                var employee = connection.QueryFirst<Employee>(querySelect, new { id });
+                _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(employee));
+                return employee;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при поиске объекта");
+                throw;
+            }
         }
 
         public IEnumerable<Employee> GetEmployees()
         {
-            return [];
+            _logger.LogInformation("Получение всех объектов");
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = "SELECT * FROM Employee";
+                var employees = connection.Query<Employee>(querySelect);
+                _logger.LogDebug("Полученные объекты: {json}",
+                JsonConvert.SerializeObject(employees));
+                return employees;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при чтении объектов");
+                throw;
+            }
         }
 
         public void UpdateEmployee(Employee employee)
         {
+            _logger.LogInformation("Редактирование объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(employee));
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryUpdate = @"
+                UPDATE Employee
+                SET
+                PositionEmployee=@PositionEmployee,
+                FirstName=@FirstName,
+                SecondName=@SecondName,
+                Surname=@Surname
+                WHERE ID=@ID";
+                connection.Execute(queryUpdate, employee);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при редактировании объекта");
+                throw;
+            }
         }
     }
 }
diff --git a/ProjectOptika/Scripts/Repositories/Implementations/OrderRepository.cs b/ProjectOptika/Scripts/Repositories/Implementations/OrderRepository.cs
index c979287..e4f49a5 100644
--- a/ProjectOptika/Scripts/Repositories/Implementations/OrderRepository.cs
+++ b/ProjectOptika/Scripts/Repositories/Implementations/OrderRepository.cs
@@ -1,20 +1,103 @@
-using ProjectOptika.Scripts.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using ProjectOptika.Scripts.Entities;
 
 namespace ProjectOptika.Scripts.Repositories.Implementations
 {
     public class OrderRepository : IOrderRepository
     {
+        private readonly IConnectionString _connectionString;
+        private readonly ILogger<OrderRepository> _logger;
+
+        public OrderRepository(IConnectionString connectionString, ILogger<OrderRepository> logger)
+        {
+            _connectionString = connectionString;
+            _logger = logger;
+        }
+
         public void CreateOrder(Order order)
         {
+            _logger.LogInformation("Добавление объекта");
+            _logger.LogDebug("Объект: {json}",
+            JsonConvert.SerializeObject(order));
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                connection.Open();
+                using var transaction = connection.BeginTransaction();
+                var queryInsert = @"
+                INSERT INTO Zakaz (EmployeeID, ClientID, OrderDate, TotalCost)
+                VALUES (@EmployeeID, @ClientID, @OrderDate, @TotalCost);
+                SELECT MAX(Id) FROM Zakaz";
+                var orderID = connection.QueryFirst<int>(queryInsert, order, transaction);
+                var querySubInsert = @"
+                INSERT INTO AccessoriesOrder (ZakazID, AccessoriesID, Count)
+                VALUES (@orderID, @AccesoryId, @Count)";
+                foreach (var elem in order.AccesoriesOrders)
+                {
+                    connection.Execute(querySubInsert, new
+                    {
+                        orderID,
+                        elem.AccesoryId,
+                        elem.Count
+                    }, transaction);
+                }
+                transaction.Commit();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при добавлении объекта");
+                throw;
+            }
         }
 
         public void DeleteOrder(int id)
         {
+            _logger.LogInformation("Удаление объекта");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                connection.Open();
+                using var transaction = connection.BeginTransaction();
+                var queryDelete = @"
+                DELETE FROM AccessoriesOrder
+                WHERE ZakazID = @id";
+
+                var queryDeleteReceptions = @"
+                DELETE FROM Zakaz
+                WHERE ID=@id";
+                connection.Execute(queryDelete, new { id });
+                connection.Execute(queryDeleteReceptions, new { id });
+                transaction.Commit();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при удалении объекта");
+                throw;
+            }
         }
 
         public IEnumerable<Order> GetOrders(DateTime? startDate = null, DateTime? endDate = null, double? totalCost = null, int? id = null, int? employeeID = null, int? clientID = null)
         {
-            return [];
+            _logger.LogInformation("Получение всех объектов");
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = @"SELECT * FROM Zakaz";
+                var orders =
+                connection.Query<Order>(querySelect);
+                _logger.LogDebug("Полученные объекты: {json}",
+                JsonConvert.SerializeObject(orders));
+                return orders;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при чтении объектов");
+                throw;
+            }
         }
     }
 }
diff --git a/ProjectOptika/Scripts/Repositories/Implementations/SpecificationsRepository.cs b/ProjectOptika/Scripts/Repositories/Implementations/SpecificationsRepository.cs
index 32f9ab2..8744851 100644
--- a/ProjectOptika/Scripts/Repositories/Implementations/SpecificationsRepository.cs
+++ b/ProjectOptika/Scripts/Repositories/Implementations/SpecificationsRepository.cs
@@ -1,29 +1,125 @@
-using ProjectOptika.Scripts.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using ProjectOptika.Scripts.Entities;
 
 namespace ProjectOptika.Scripts.Repositories.Implementations
 {
     public class SpecificationsRepository : ISpecificationsRepository
     {
+        private readonly IConnectionString _connectionString;
+        private readonly ILogger<SpecificationsRepository> _logger;
+
+        public SpecificationsRepository(IConnectionString connectionString, ILogger<SpecificationsRepository> logger)
+        {
+            _connectionString = connectionString;
+            _logger = logger;
+        }
+
         public void CreateSpecifications(Specifications specification)
         {
+            _logger.LogInformation("Добавление объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(specification));
+
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryInsert = @"
+            INSERT INTO Specifications (AccessoriesID, Material, Astigmatism, Dioptericity, OriginCountry, TimeProduction)
+               VALUES (@AccessoriesID, @Material, @Astigmatism, @Dioptericity, @OriginCountry, @TimeProduction)";
+                connection.Execute(queryInsert, specification);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при добавлении объекта");
+                throw;
+            }
         }
 
         public void DeleteSpecifications(int id)
         {
+            _logger.LogInformation("Удаление объекта");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryDelete = @"
+                DELETE FROM Specifications
+                WHERE ID=@id";
+                connection.Execute(queryDelete, new { id });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при удалении объекта");
+                throw;
+            }
         }
 
         public IEnumerable<Specifications> GetSpecifications()
         {
-            return [];
+            _logger.LogInformation("Получение всех объектов");
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = "SELECT * FROM Specifications";
+                var specifications = connection.Query<Specifications>(querySelect);
+                _logger.LogDebug("Полученные объекты: {json}",
+                JsonConvert.SerializeObject(specifications));
+                return specifications;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при чтении объектов");
+                throw;
+            }
         }
 
         public Specifications GetSpecificationsByID(int id)
         {
-            return Specifications.CreateEntity(0, 0, string.Empty, string.Empty, string.Empty, string.Empty, 0.0);
+            _logger.LogInformation("Получение объекта по идентификатору");
+            _logger.LogDebug("Объект: {id}", id);
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var querySelect = @"
+                SELECT * FROM Specifications
+                WHERE ID=@id";
+                var specifications = connection.QueryFirst<Specifications>(querySelect, new { id });
+                _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(specifications));
+                return specifications;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при поиске объекта");
+                throw;
+            }
         }
 
         public void UpdateSpecifications(Specifications specification)
         {
+            _logger.LogInformation("Редактирование объекта");
+            _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(specification));
+            try
+            {
+                using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+                var queryUpdate = @"
+                UPDATE Specifications
+                SET
+                AccessoriesID=@AccessoriesID,
+                Material=@Material,
+                Astigmatism=@Astigmatism,
+                Dioptericity=@Dioptericity,
+                OriginCountry=@OriginCountry,
+                TimeProduction=@TimeProduction
+                WHERE ID=@ID";
+                connection.Execute(queryUpdate, specification);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка при редактировании объекта");
+                throw;
+            }
         }
     }
 }
diff --git a/ProjectOptika/appsettings.json b/ProjectOptika/appsettings.json
new file mode 100644
index 0000000..ca3f7ae
--- /dev/null
+++ b/ProjectOptika/appsettings.json
@@ -0,0 +1,15 @@
+{
+  "Serilog": {
+    "Using": [ "Serilog.Sinks.File" ],
+    "MinimumLevel": "Debug",
+    "WriteTo": [
+      {
+        "Name": "File",
+        "Args": {
+          "path": "Logs/optika_log.txt",
+          "rollingInterval": "Day"
+        }
+      }
+    ]
+  }
+}
\ No newline at end of file