From fe3802d1787fce8c877671c5cff7447b9184665b Mon Sep 17 00:00:00 2001
From: Kirill <39030726+Kirill3455@users.noreply.github.com>
Date: Sun, 22 Dec 2024 22:33:52 +0400
Subject: [PATCH] 2

---
 Project/Project/Entities/Student.cs           |   6 +-
 Project/Project/FormMain.resx                 |   4 +-
 .../Project/Forms/StatementForm.Designer.cs   |  11 +-
 Project/Project/Forms/StatementForm.cs        |  19 +++-
 Project/Project/Forms/StatementForm.resx      |   2 +-
 .../Forms/StatementListForm.Designer.cs       |   2 +-
 Project/Project/Forms/StudentForm.cs          |   2 +-
 Project/Project/Program.cs                    |  21 +++-
 .../Project/Repositories/IConnectionString.cs |  12 +++
 .../Implementations/ConnectionString.cs       |  12 +++
 .../Implementations/DecreeRepository.cs       |  48 ++++++++-
 .../Implementations/StatementRepository.cs    |  65 ++++++++++-
 .../Implementations/StudentRepository.cs      | 102 +++++++++++++++++-
 .../Implementations/SubjectRepository.cs      | 101 ++++++++++++++++-
 .../Implementations/TeacherRepository.cs      | 100 ++++++++++++++++-
 Project/Project/appsettings.json              |  15 +++
 16 files changed, 490 insertions(+), 32 deletions(-)
 create mode 100644 Project/Project/Repositories/IConnectionString.cs
 create mode 100644 Project/Project/Repositories/Implementations/ConnectionString.cs
 create mode 100644 Project/Project/appsettings.json

diff --git a/Project/Project/Entities/Student.cs b/Project/Project/Entities/Student.cs
index 196883d..f3e8de6 100644
--- a/Project/Project/Entities/Student.cs
+++ b/Project/Project/Entities/Student.cs
@@ -6,16 +6,16 @@ public class Student
     public string FirstName { get; private set; } = string.Empty;
     public string LastName { get; private set; } = string.Empty;
     public float Score { get; private set; }
-    //public Hostel HostelType { get; private set; }
     public string DisplayName => $"{FirstName} {LastName}";
 
-    public static Student CreateOperation(int id, string firstName, string lastName, float Score)
+    public static Student CreateOperation(int id, string firstName, string lastName, float score)
     {
         return new Student
         {
             Id = id,
             FirstName = firstName,
-            LastName = lastName
+            LastName = lastName,
+            Score = score
         };
     }
 }
diff --git a/Project/Project/FormMain.resx b/Project/Project/FormMain.resx
index 75b3b6d..8e42b84 100644
--- a/Project/Project/FormMain.resx
+++ b/Project/Project/FormMain.resx
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
   <!--
-    Microsoft ResX Schema
+    Microsoft ResX Schema 
 
     Version 2.0
 
@@ -48,7 +48,7 @@
     value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
-
+    
     mimetype: application/x-microsoft.net.object.soap.base64
     value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
diff --git a/Project/Project/Forms/StatementForm.Designer.cs b/Project/Project/Forms/StatementForm.Designer.cs
index 056a168..47bb625 100644
--- a/Project/Project/Forms/StatementForm.Designer.cs
+++ b/Project/Project/Forms/StatementForm.Designer.cs
@@ -133,8 +133,15 @@ namespace Project.Forms
             // 
             // ColumnMark
             // 
-            ColumnMark.DataPropertyName = "Enum.GetValues(typeof(Mark));";
-            ColumnMark.DataSource = Enum.GetValues(typeof(Mark));
+            ColumnMark.DataPropertyName = "Enum.GetNames(typeof(Mark));";
+            ColumnMark.DataSource = new Mark[]
+    {
+    Mark.One,
+    Mark.Two,
+    Mark.Three,
+    Mark.Four,
+    Mark.Five
+    };
             ColumnMark.HeaderText = "Оценки";
             ColumnMark.Name = "ColumnMark";
             ColumnMark.Resizable = DataGridViewTriState.True;
diff --git a/Project/Project/Forms/StatementForm.cs b/Project/Project/Forms/StatementForm.cs
index 86ee65b..2d3ca4f 100644
--- a/Project/Project/Forms/StatementForm.cs
+++ b/Project/Project/Forms/StatementForm.cs
@@ -29,6 +29,8 @@ public partial class StatementForm : Form
         ColumnStudent.DataSource = studentRepository.GetAllStudents();
         ColumnStudent.DisplayMember = "DisplayName";
         ColumnStudent.ValueMember = "Id";
+
+        ColumnMark.DataSource = Enum.GetNames(typeof(Mark));
     }
 
     private void ButtonSave_Click(object sender, EventArgs e)
@@ -65,9 +67,20 @@ public partial class StatementForm : Form
             {
                 continue;
             }
-            list.Add(StatementStudent.CreateOperation(0,
-                Convert.ToInt32(row.Cells["ColumnStudent"].Value),
-                (Mark)Convert.ToInt32(row.Cells["ColumnMark"].Value)));
+            if (Enum.TryParse<Mark>(row.Cells["ColumnMark"].Value.ToString(), out var mark))
+            {
+                list.Add(StatementStudent.CreateOperation(
+                    0,
+                    Convert.ToInt32(row.Cells["ColumnStudent"].Value),
+                    mark));
+            }
+            else
+            {
+                MessageBox.Show($"Недопустимое значение оценки: {row.Cells["ColumnMark"].Value}",
+                                "Ошибка",
+                                MessageBoxButtons.OK,
+                                MessageBoxIcon.Warning);
+            }
         }
         return list;
     }
diff --git a/Project/Project/Forms/StatementForm.resx b/Project/Project/Forms/StatementForm.resx
index cb09f39..81039cf 100644
--- a/Project/Project/Forms/StatementForm.resx
+++ b/Project/Project/Forms/StatementForm.resx
@@ -120,7 +120,7 @@
   <metadata name="ColumnStudent.UserAddedColumn" type="System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>True</value>
   </metadata>
-  <metadata name="Оценки.UserAddedColumn" type="System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+  <metadata name="ColumnMark.UserAddedColumn" type="System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>True</value>
   </metadata>
 </root>
\ No newline at end of file
diff --git a/Project/Project/Forms/StatementListForm.Designer.cs b/Project/Project/Forms/StatementListForm.Designer.cs
index 05325a6..9852a42 100644
--- a/Project/Project/Forms/StatementListForm.Designer.cs
+++ b/Project/Project/Forms/StatementListForm.Designer.cs
@@ -94,4 +94,4 @@
         private Button ButtonAdd;
         private DataGridView dataGridViewData;
     }
-}
\ No newline at end of file
+}   
\ No newline at end of file
diff --git a/Project/Project/Forms/StudentForm.cs b/Project/Project/Forms/StudentForm.cs
index 5a841ae..8ac13ee 100644
--- a/Project/Project/Forms/StudentForm.cs
+++ b/Project/Project/Forms/StudentForm.cs
@@ -70,7 +70,7 @@ public partial class StudentForm : Form
 
     private void ButtonCancel_Click(object sender, EventArgs e) => Close();
 
-    private Student CreateStudent(int id) => Student.CreateOperation(
+    private Student CreateStudent(int id) => Student.CreateOperation    (
         id,
         textBoxName.Text,
         textBoxSurname.Text,(float)numericUpDownScore.Value!);
diff --git a/Project/Project/Program.cs b/Project/Project/Program.cs
index 3e2ab0a..dc6075d 100644
--- a/Project/Project/Program.cs
+++ b/Project/Project/Program.cs
@@ -1,9 +1,10 @@
-using Unity.Lifetime;
 using Unity.Microsoft.Logging;
 using Unity;
 using Project.Repositories.Implementations;
 using Project.Repositories;
-using Project.Entities;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using Serilog;
 
 namespace Project
 {
@@ -24,14 +25,26 @@ namespace Project
         private static IUnityContainer CreateContainer()
         {
             var container = new UnityContainer();
-
+            container.AddExtension(new LoggingExtension(CreateLoggerFactory()));
             container.RegisterType<IStudentRepository, StudentRepository>();
             container.RegisterType<IDecreeRepository, DecreeRepository>();
             container.RegisterType<IStatementRepository, StatementRepository>();
             container.RegisterType<ISubjectRepository, SubjectRepository>();
             container.RegisterType<ITeacherRepository, TeacherRepository>();
-
+            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/Project/Project/Repositories/IConnectionString.cs b/Project/Project/Repositories/IConnectionString.cs
new file mode 100644
index 0000000..948e27b
--- /dev/null
+++ b/Project/Project/Repositories/IConnectionString.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Project.Repositories;
+
+public interface IConnectionString
+{
+    public string ConnectionString { get; }
+}
diff --git a/Project/Project/Repositories/Implementations/ConnectionString.cs b/Project/Project/Repositories/Implementations/ConnectionString.cs
new file mode 100644
index 0000000..ed867c7
--- /dev/null
+++ b/Project/Project/Repositories/Implementations/ConnectionString.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Project.Repositories.Implementations;
+
+public class ConnectionString : IConnectionString
+{
+    string IConnectionString.ConnectionString => "Host=localhost;Port=5432;Username=postgres;Password=admin123;Database=BD";
+}
diff --git a/Project/Project/Repositories/Implementations/DecreeRepository.cs b/Project/Project/Repositories/Implementations/DecreeRepository.cs
index a202cba..065e678 100644
--- a/Project/Project/Repositories/Implementations/DecreeRepository.cs
+++ b/Project/Project/Repositories/Implementations/DecreeRepository.cs
@@ -1,16 +1,58 @@
-using Project.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using Project.Entities;
 
 namespace Project.Repositories.Implementations;
 
-
 public class DecreeRepository : IDecreeRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<DecreeRepository> _logger;
+
+    public DecreeRepository(IConnectionString connectionString, ILogger<DecreeRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void AddDecree(Decree decree)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(decree));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+            INSERT INTO Decree (StudentId, Name, Date, Info)
+            VALUES (@StudentId, @Name, @Date, @Info)";
+            connection.Execute(queryInsert, decree);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Decree> GetAllDecrees()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Decree";
+            var decrees = connection.Query<Decree>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}",
+            JsonConvert.SerializeObject(decrees));
+            return decrees;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
 }
diff --git a/Project/Project/Repositories/Implementations/StatementRepository.cs b/Project/Project/Repositories/Implementations/StatementRepository.cs
index 765d48d..2d76cc1 100644
--- a/Project/Project/Repositories/Implementations/StatementRepository.cs
+++ b/Project/Project/Repositories/Implementations/StatementRepository.cs
@@ -1,15 +1,76 @@
-using Project.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using Project.Entities;
 
 namespace Project.Repositories.Implementations;
 
 public class StatementRepository : IStatementRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<StatementRepository> _logger;
+
+    public StatementRepository(IConnectionString connectionString, ILogger<StatementRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void CreateStatement(Statement statement)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}",
+        JsonConvert.SerializeObject(statement));
+        try
+        {
+            using var connection = new
+            NpgsqlConnection(_connectionString.ConnectionString);
+            connection.Open();
+            using var transaction = connection.BeginTransaction();
+            var queryInsert = @"
+                INSERT INTO Statement (TeacherId, SubjectId, Date)
+                VALUES (@TeacherId, @SubjectId, @Date);
+                SELECT MAX(Id) FROM Statement";
+            var statementId =
+            connection.QueryFirst<int>(queryInsert, statement, transaction);
+            var querySubInsert = @"
+                INSERT INTO StatementStudent (StatementId, StudentId, Mark)
+                VALUES (@StatementId, @StudentId, @Mark)";
+            foreach (var elem in statement.StatementStudents)
+            {
+                connection.Execute(querySubInsert, new
+                {
+                    statementId,
+                    elem.StudentId,
+                    elem.Mark
+                }, transaction);
+            }
+            transaction.Commit();
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Statement> GetAllStatements()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Statement";
+            var statements = connection.Query<Statement>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}",
+            JsonConvert.SerializeObject(statements));
+            return statements;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }   
     }
 }
\ No newline at end of file
diff --git a/Project/Project/Repositories/Implementations/StudentRepository.cs b/Project/Project/Repositories/Implementations/StudentRepository.cs
index fdd19cb..8e32cbe 100644
--- a/Project/Project/Repositories/Implementations/StudentRepository.cs
+++ b/Project/Project/Repositories/Implementations/StudentRepository.cs
@@ -1,28 +1,124 @@
-using Project.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using Project.Entities;
 
 namespace Project.Repositories.Implementations;
 
 public class StudentRepository : IStudentRepository
 {
+
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<StudentRepository> _logger;
+
+    public StudentRepository(IConnectionString connectionString, ILogger<StudentRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void AddStudent(Student student)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(student));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+            INSERT INTO Student (FirstName, LastName, Score)
+            VALUES (@FirstName, @LastName, @Score)";
+            connection.Execute(queryInsert, student);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public void DeleteStudent(int id)
     {
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Student
+                WHERE Id=@id";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Student> GetAllStudents()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Student";
+            var students = connection.Query<Student>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}",
+            JsonConvert.SerializeObject(students));
+            return students;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
 
     public Student GetStudentById(int id)
     {
-        return Student.CreateOperation(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 Student
+                WHERE Id=@id";
+            var student = connection.QueryFirst<Student>(querySelect, new { id });
+            _logger.LogDebug("Найденный объект: {json}",
+                JsonConvert.SerializeObject(student));
+            return student;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
 
     public void UpdateStudent(Student student)
     {
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}",
+            JsonConvert.SerializeObject(student));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Student
+                SET
+                    FirstName=@FirstName,
+                    LastName=@LastName,
+                    Score=@Score
+                WHERE Id=@Id";
+            connection.Execute(queryUpdate, student);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
 }
\ No newline at end of file
diff --git a/Project/Project/Repositories/Implementations/SubjectRepository.cs b/Project/Project/Repositories/Implementations/SubjectRepository.cs
index 067047a..231ad04 100644
--- a/Project/Project/Repositories/Implementations/SubjectRepository.cs
+++ b/Project/Project/Repositories/Implementations/SubjectRepository.cs
@@ -1,29 +1,122 @@
-using Project.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using Project.Entities;
 
 namespace Project.Repositories.Implementations;
 
-
 public class SubjectRepository : ISubjectRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<SubjectRepository> _logger;
+
+    public SubjectRepository(IConnectionString connectionString, ILogger<SubjectRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void AddSubject(Subject subject)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(subject));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+            INSERT INTO Subject (Name, Courses)
+            VALUES (@Name, @Courses)";
+            connection.Execute(queryInsert, subject);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public void DeleteSubject(int id)
     {
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Subject
+                WHERE Id=@id";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Subject> GetAllSubjects()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Subject";
+            var subjects = connection.Query<Subject>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}",
+            JsonConvert.SerializeObject(subjects));
+            return subjects;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
 
     public Subject GetSubjectById(int id)
     {
-        return Subject.CreateOperation(0, "", Entities.Enums.Course.Third);
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Subject
+                WHERE Id=@id";
+            var subject = connection.QueryFirst<Subject>(querySelect, new { id });
+            _logger.LogDebug("Найденный объект: {json}",
+                JsonConvert.SerializeObject(subject));
+            return subject;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
 
     public void UpdateSubject(Subject subject)
     {
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}",
+            JsonConvert.SerializeObject(subject));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Subject
+                SET
+                    Name=@Name,
+                    Courses=@Courses
+                WHERE Id=@Id";
+            connection.Execute(queryUpdate, subject);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
 }
diff --git a/Project/Project/Repositories/Implementations/TeacherRepository.cs b/Project/Project/Repositories/Implementations/TeacherRepository.cs
index ea77a27..e26798b 100644
--- a/Project/Project/Repositories/Implementations/TeacherRepository.cs
+++ b/Project/Project/Repositories/Implementations/TeacherRepository.cs
@@ -1,28 +1,122 @@
-using Project.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using Project.Entities;
 
 namespace Project.Repositories.Implementations;
 
 public class TeacherRepository : ITeacherRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<TeacherRepository> _logger;
+
+    public TeacherRepository(IConnectionString connectionString, ILogger<TeacherRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void AddTeacher(Teacher teacher)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(teacher));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+            INSERT INTO Teacher (FirstName, LastName)
+            VALUES (@FirstName, @LastName)";
+            connection.Execute(queryInsert, teacher);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public void DeleteTeacher(int id)
     {
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Teacher
+                WHERE Id=@id";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Teacher> GetAllTeachers()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = "SELECT * FROM Teacher";
+            var teachers = connection.Query<Teacher>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}",
+            JsonConvert.SerializeObject(teachers));
+            return teachers;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
 
     public Teacher GetTeacherById(int id)
     {
-        return Teacher.CreateOperation(0, "", "");
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Teacher
+                WHERE Id=@id";
+            var teacher = connection.QueryFirst<Teacher>(querySelect, new { id });
+            _logger.LogDebug("Найденный объект: {json}",
+                JsonConvert.SerializeObject(teacher));
+            return teacher;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
 
     public void UpdateTeacher(Teacher teacher)
     {
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}",
+            JsonConvert.SerializeObject(teacher));
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Teacher
+                SET
+                    FirstName=@FirstName,
+                    LastName=@LastName
+                WHERE Id=@Id";
+            connection.Execute(queryUpdate, teacher);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
 }
\ No newline at end of file
diff --git a/Project/Project/appsettings.json b/Project/Project/appsettings.json
new file mode 100644
index 0000000..92987f5
--- /dev/null
+++ b/Project/Project/appsettings.json
@@ -0,0 +1,15 @@
+{
+  "Serilog": {
+    "Using": [ "Serilog.Sinks.File" ],
+    "MinimumLevel": "Debug",
+    "WriteTo": [
+      {
+        "Name": "File",
+        "Args": {
+          "path": "Logs/gas_log.txt",
+          "rollingInterval": "Day"
+        }
+      }
+    ]
+  }
+}
\ No newline at end of file
-- 
2.25.1