diff --git a/ITServiceManager/ITServiceManager/ITServiceManager.csproj b/ITServiceManager/ITServiceManager/ITServiceManager.csproj
index 4ccf359..6470a09 100644
--- a/ITServiceManager/ITServiceManager/ITServiceManager.csproj
+++ b/ITServiceManager/ITServiceManager/ITServiceManager.csproj
@@ -10,7 +10,18 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Dapper" Version="2.1.35" />
+    <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="8.0.5" />
+    <PackageReference Include="Serilog" Version="4.1.0" />
+    <PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />
+    <PackageReference Include="Serilog.Settings.Configuration" Version="8.0.4" />
+    <PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />
     <PackageReference Include="Unity" Version="5.11.10" />
+    <PackageReference Include="Unity.Microsoft.Logging" Version="5.11.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/ITServiceManager/ITServiceManager/Program.cs b/ITServiceManager/ITServiceManager/Program.cs
index 81423f3..85816b3 100644
--- a/ITServiceManager/ITServiceManager/Program.cs
+++ b/ITServiceManager/ITServiceManager/Program.cs
@@ -1,5 +1,9 @@
 using ITServiceManager.Repositories.Implementations;
 using ITServiceManager.Repositories;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using Unity.Microsoft.Logging;
+using Serilog;
 using Unity;
 
 namespace ITServiceManager
@@ -22,6 +26,9 @@ namespace ITServiceManager
         private static IUnityContainer CreateContainer()
         {
             var container = new UnityContainer();
+
+            container.AddExtension(new LoggingExtension(CreateLoggerFactory()));
+
             container.RegisterType<IOrderRepository, OrderRepository>();
             container.RegisterType<IAppointmentRepository, AppointmentRepository>();
             container.RegisterType<IServiceRepository, ServiceRepository>();
@@ -32,5 +39,17 @@ namespace ITServiceManager
 
             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/ITServiceManager/ITServiceManager/Repositories/Implementations/AppointmentRepository.cs b/ITServiceManager/ITServiceManager/Repositories/Implementations/AppointmentRepository.cs
index 0127623..8e895bc 100644
--- a/ITServiceManager/ITServiceManager/Repositories/Implementations/AppointmentRepository.cs
+++ b/ITServiceManager/ITServiceManager/Repositories/Implementations/AppointmentRepository.cs
@@ -1,12 +1,36 @@
-using ITServiceManager.Entities;
+using Dapper;
+using ITServiceManager.Entities;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
 
 namespace ITServiceManager.Repositories.Implementations;
 
 public class AppointmentRepository : IAppointmentRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<Appointment> _logger;
+    public AppointmentRepository(IConnectionString connectionString, ILogger<Appointment> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
     public IEnumerable<Appointment> ReadAppointments()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"SELECT * FROM Appointments";
+            var order = connection.Query<Appointment>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}", JsonConvert.SerializeObject(order));
+            return order;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
     public Appointment ReadAppointmentById(int id)
     {
diff --git a/ITServiceManager/ITServiceManager/Repositories/Implementations/CompanyRepository.cs b/ITServiceManager/ITServiceManager/Repositories/Implementations/CompanyRepository.cs
index f4df14c..a5f9f12 100644
--- a/ITServiceManager/ITServiceManager/Repositories/Implementations/CompanyRepository.cs
+++ b/ITServiceManager/ITServiceManager/Repositories/Implementations/CompanyRepository.cs
@@ -1,33 +1,116 @@
-using ITServiceManager.Entities;
+using Dapper;
+using ITServiceManager.Entities;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
 
 namespace ITServiceManager.Repositories.Implementations;
 
 public class CompanyRepository : ICompanyRepository
 {
     private readonly IConnectionString _connectionString;
+    private readonly ILogger<Company> _logger;
 
-    public CompanyRepository(IConnectionString connectionString)
+    public CompanyRepository(IConnectionString connectionString, ILogger<Company> logger)
     {
         _connectionString = connectionString;
+        _logger = logger;
     }
     public IEnumerable<Company> ReadCompanies()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Companies";
+            var companies = connection.Query<Company>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}", JsonConvert.SerializeObject(companies));
+            return companies;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
     public Company ReadCompanyById(int id)
     {
-        return null;
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Companies
+                WHERE Id=@id";
+            var company = connection.QueryFirst<Company>(querySelect, new
+            {
+                id
+            });
+            _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(company));
+            return company;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
     public void CreateCompany(Company company)
     {
-
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(company));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+                INSERT INTO Companies (Name, Address)
+                VALUES (@Name, @Address)";
+            connection.Execute(queryInsert, company);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
     public void UpdateCompany(Company company)
     {
-
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(company));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Companies
+                SET
+                Name=@Name,
+                Address=@Address,
+                WHERE Id=@Id";
+            connection.Execute(queryUpdate, company);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
     public void DeleteCompany(int id)
     {
-
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Companies
+                WHERE Id=@id";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 }
diff --git a/ITServiceManager/ITServiceManager/Repositories/Implementations/ConnectionString.cs b/ITServiceManager/ITServiceManager/Repositories/Implementations/ConnectionString.cs
index 04eb28a..b4140ca 100644
--- a/ITServiceManager/ITServiceManager/Repositories/Implementations/ConnectionString.cs
+++ b/ITServiceManager/ITServiceManager/Repositories/Implementations/ConnectionString.cs
@@ -2,5 +2,5 @@
 
 internal class ConnectionString : IConnectionString
 {
-    string IConnectionString.ConnectionString => "";
+    string IConnectionString.ConnectionString => "Server=localhost;Port=5432;Database=itcompany;";
 }
diff --git a/ITServiceManager/ITServiceManager/Repositories/Implementations/EmployeeRepository.cs b/ITServiceManager/ITServiceManager/Repositories/Implementations/EmployeeRepository.cs
index 3cc552d..13a063c 100644
--- a/ITServiceManager/ITServiceManager/Repositories/Implementations/EmployeeRepository.cs
+++ b/ITServiceManager/ITServiceManager/Repositories/Implementations/EmployeeRepository.cs
@@ -1,27 +1,118 @@
-using ITServiceManager.Entities;
+using Dapper;
+using ITServiceManager.Entities;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
 
 namespace ITServiceManager.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 IEnumerable<Employee> ReadEmployees()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Employees";
+            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 Employee ReadEmployeeById(int id)
     {
-        return null;
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Employees
+                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 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 Employees (FirstName, LastName, Position)
+                VALUES (@FirstName, @LastName, @Position)";
+            connection.Execute(queryInsert, employee);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            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 Employees
+                SET
+                FirstName=@FirstName,
+                LastName=@LastName,
+                Position=@Position
+                WHERE Id=@Id";
+            connection.Execute(queryUpdate, employee);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании 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 Employees
+                WHERE Id=@id";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 }
diff --git a/ITServiceManager/ITServiceManager/Repositories/Implementations/ServiceRepository.cs b/ITServiceManager/ITServiceManager/Repositories/Implementations/ServiceRepository.cs
index 296eabf..af28da3 100644
--- a/ITServiceManager/ITServiceManager/Repositories/Implementations/ServiceRepository.cs
+++ b/ITServiceManager/ITServiceManager/Repositories/Implementations/ServiceRepository.cs
@@ -1,27 +1,116 @@
-using ITServiceManager.Entities;
+using Dapper;
+using ITServiceManager.Entities;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
 
 namespace ITServiceManager.Repositories.Implementations;
 
 public class ServiceRepository : IServiceRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<Service> _logger;
+
+    public ServiceRepository(IConnectionString connectionString, ILogger<Service> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
     public IEnumerable<Service> ReadServices()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Services";
+            var services = connection.Query<Service>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}", JsonConvert.SerializeObject(services));
+            return services;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
     public Service ReadServiceById(int id)
     {
-        return null;
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Services
+                WHERE Id=@id";
+            var service = connection.QueryFirst<Service>(querySelect, new
+            {
+                id
+            });
+            _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(service));
+            return service;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
     public void CreateService(Service service)
     {
-
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(service));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+                INSERT INTO Services (Name, ServiceType, Description)
+                VALUES (@Name, @ServiceType, @Description)";
+            connection.Execute(queryInsert, service);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
     public void UpdateService(Service service)
     {
-
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(service));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Services
+                SET
+                ServiceType=@ServiceType,
+                Description=@Description,
+                WHERE Id=@Id";
+            connection.Execute(queryUpdate, service);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
     public void DeleteService(int id)
     {
-
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Services
+                WHERE Id=@id";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 }
diff --git a/ITServiceManager/ITServiceManager/appsettings.json b/ITServiceManager/ITServiceManager/appsettings.json
index 077404a..540cd04 100644
--- a/ITServiceManager/ITServiceManager/appsettings.json
+++ b/ITServiceManager/ITServiceManager/appsettings.json
@@ -1,3 +1,15 @@
 {
-  
+  "Serilog": {
+    "Using": [ "Serilog.Sinks.File" ],
+    "MinimumLevel": "Debug",
+    "WriteTo": [
+      {
+        "Name": "File",
+        "Args": {
+          "path": "Logs.txt",
+          "rollingInterval": "Day"
+        }
+      }
+    ]
+  }
 }
\ No newline at end of file