add: 为前后端添加exam数据库管理

server/src/Database.cs

@@ -150,6 +150,36 @@ public class Board
     }
 }
 
+/// <summary>
+/// 实验类，表示实验信息
+/// </summary>
+public class Exam
+{
+    /// <summary>
+    /// 实验的唯一标识符
+    /// </summary>
+    [PrimaryKey]
+    public required string ID { get; set; }
+
+    /// <summary>
+    /// 实验文档内容（Markdown格式）
+    /// </summary>
+    [NotNull]
+    public required string DocContent { get; set; }
+
+    /// <summary>
+    /// 实验创建时间
+    /// </summary>
+    [NotNull]
+    public DateTime CreatedTime { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// 实验最后更新时间
+    /// </summary>
+    [NotNull]
+    public DateTime UpdatedTime { get; set; } = DateTime.Now;
+}
+
 /// <summary>
 /// 应用程序数据连接类，用于与数据库交互
 /// </summary>
@@ -197,6 +227,7 @@ public class AppDataConnection : DataConnection
         logger.Info("正在创建数据库表...");
         this.CreateTable<User>();
         this.CreateTable<Board>();
+        this.CreateTable<Exam>();
         logger.Info("数据库表创建完成");
     }
 
@@ -208,6 +239,7 @@ public class AppDataConnection : DataConnection
         logger.Warn("正在删除所有数据库表...");
         this.DropTable<User>();
         this.DropTable<Board>();
+        this.DropTable<Exam>();
         logger.Warn("所有数据库表已删除");
     }
 
@@ -635,4 +667,117 @@ public class AppDataConnection : DataConnection
     /// FPGA 板子表
     /// </summary>
     public ITable<Board> BoardTable => this.GetTable<Board>();
+
+    /// <summary>
+    /// 实验表
+    /// </summary>
+    public ITable<Exam> ExamTable => this.GetTable<Exam>();
+
+    /// <summary>
+    /// 扫描 exam 文件夹并更新实验数据库
+    /// </summary>
+    /// <param name="examFolderPath">exam 文件夹的路径</param>
+    /// <returns>更新的实验数量</returns>
+    public int ScanAndUpdateExams(string examFolderPath)
+    {
+        if (!Directory.Exists(examFolderPath))
+        {
+            logger.Warn($"实验文件夹不存在: {examFolderPath}");
+            return 0;
+        }
+
+        int updateCount = 0;
+        var subdirectories = Directory.GetDirectories(examFolderPath);
+
+        foreach (var examDir in subdirectories)
+        {
+            var examId = Path.GetFileName(examDir);
+            var docPath = Path.Combine(examDir, "doc.md");
+
+            if (!File.Exists(docPath))
+            {
+                logger.Warn($"实验 {examId} 缺少 doc.md 文件");
+                continue;
+            }
+
+            try
+            {
+                var docContent = File.ReadAllText(docPath);
+                var existingExam = this.ExamTable.Where(e => e.ID == examId).FirstOrDefault();
+
+                if (existingExam == null)
+                {
+                    // 创建新实验
+                    var newExam = new Exam
+                    {
+                        ID = examId,
+                        DocContent = docContent,
+                        CreatedTime = DateTime.Now,
+                        UpdatedTime = DateTime.Now
+                    };
+                    this.Insert(newExam);
+                    logger.Info($"新实验已添加: {examId}");
+                    updateCount++;
+                }
+                else
+                {
+                    // 更新现有实验
+                    var fileLastWrite = File.GetLastWriteTime(docPath);
+                    if (fileLastWrite > existingExam.UpdatedTime)
+                    {
+                        this.ExamTable
+                            .Where(e => e.ID == examId)
+                            .Set(e => e.DocContent, docContent)
+                            .Set(e => e.UpdatedTime, DateTime.Now)
+                            .Update();
+                        logger.Info($"实验已更新: {examId}");
+                        updateCount++;
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.Error($"处理实验 {examId} 时出错: {ex.Message}");
+            }
+        }
+
+        logger.Info($"实验扫描完成，共更新 {updateCount} 个实验");
+        return updateCount;
+    }
+
+    /// <summary>
+    /// 获取所有实验信息
+    /// </summary>
+    /// <returns>所有实验的数组</returns>
+    public Exam[] GetAllExams()
+    {
+        var exams = this.ExamTable.OrderBy(e => e.ID).ToArray();
+        logger.Debug($"获取所有实验，共 {exams.Length} 个");
+        return exams;
+    }
+
+    /// <summary>
+    /// 根据实验ID获取实验信息
+    /// </summary>
+    /// <param name="examId">实验ID</param>
+    /// <returns>包含实验信息的结果，如果未找到则返回空</returns>
+    public Result<Optional<Exam>> GetExamByID(string examId)
+    {
+        var exams = this.ExamTable.Where(exam => exam.ID == examId).ToArray();
+
+        if (exams.Length > 1)
+        {
+            logger.Error($"数据库中存在多个相同ID的实验: {examId}");
+            return new(new Exception($"数据库中存在多个相同ID的实验: {examId}"));
+        }
+
+        if (exams.Length == 0)
+        {
+            logger.Info($"未找到ID对应的实验: {examId}");
+            return new(Optional<Exam>.None);
+        }
+
+        logger.Debug($"成功获取实验信息: {examId}");
+        return new(exams[0]);
+    }
 }