diff --git a/src/Core/AudioFileMetaValidator.cs b/src/Core/AudioFileMetaValidator.cs
new file mode 100644
index 0000000..45f5c44
--- /dev/null
+++ b/src/Core/AudioFileMetaValidator.cs
@@ -0,0 +1,127 @@
+namespace OCES.Resonance.Core;
+
+/// <summary>
+/// 音频元数据验证器，验证元数据完整性和格式
+/// </summary>
+public class AudioFileMetaValidator
+{
+    /// <summary>
+    /// 验证必填字段是否完整
+    /// </summary>
+    /// <param name="meta">音频元数据对象</param>
+    /// <param name="errors">验证错误列表</param>
+    /// <returns>是否验证通过</returns>
+    public bool Validate(AudioFileMeta meta, out List<string> errors)
+    {
+        errors = new List<string>();
+
+        if (meta == null)
+        {
+            errors.Add("元数据对象为空");
+            return false;
+        }
+
+        // 验证必备字符串字段
+        ValidateRequiredField(meta.UniqueId, "UniqueId", errors);
+        ValidateRequiredField(meta.Md5, "Md5", errors);
+        ValidateRequiredField(meta.Path, "Path", errors);
+        ValidateRequiredField(meta.Filename, "Filename", errors);
+        ValidateRequiredField(meta.Folder, "Folder", errors);
+        ValidateRequiredField(meta.Directory, "Directory", errors);
+        ValidateRequiredField(meta.Type, "Type", errors);
+
+        // 验证数值字段
+        ValidatePositiveValue(meta.Duration, "Duration", errors);
+        ValidatePositiveValue(meta.TotalSamples, "TotalSamples", errors);
+        ValidatePositiveValue(meta.BitDepth, "BitDepth", errors);
+        ValidatePositiveValue(meta.Channels, "Channels", errors);
+        ValidatePositiveValue(meta.SampleRate, "SampleRate", errors);
+
+        // 验证日期字段
+        ValidateRequiredField(meta.DateAdded, "DateAdded", errors);
+        ValidateRequiredField(meta.OriginalModificationDate, "OriginalModificationDate", errors);
+        ValidateRequiredField(meta.OriginationTime, "OriginationTime", errors);
+
+        // 验证文件路径是否存在
+        if (!File.Exists(meta.Path))
+        {
+            errors.Add($"文件不存在：{meta.Path}");
+        }
+
+        // 验证 MD5 格式（32 位十六进制）
+        if (!IsValidMd5(meta.Md5))
+        {
+            errors.Add($"MD5 格式无效：{meta.Md5}");
+        }
+
+        return errors.Count == 0;
+    }
+
+    /// <summary>
+    /// 验证必填字符串字段
+    /// </summary>
+    private static void ValidateRequiredField(string? value, string fieldName, List<string> errors)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            errors.Add($"{fieldName} 不能为空");
+        }
+    }
+
+    /// <summary>
+    /// 验证必填值类型字段
+    /// </summary>
+    private static void ValidateRequiredField<T>(T value, string fieldName, List<string> errors) where T : struct
+    {
+        if (EqualityComparer<T>.Default.Equals(value, default))
+        {
+            errors.Add($"{fieldName} 不能为空");
+        }
+    }
+
+    /// <summary>
+    /// 验证正数值
+    /// </summary>
+    private static void ValidatePositiveValue(double value, string fieldName, List<string> errors)
+    {
+        if (value <= 0)
+        {
+            errors.Add($"{fieldName} 必须为正数 (当前值：{value})");
+        }
+    }
+
+    /// <summary>
+    /// 验证正数整数值
+    /// </summary>
+    private static void ValidatePositiveValue(int value, string fieldName, List<string> errors)
+    {
+        if (value <= 0)
+        {
+            errors.Add($"{fieldName} 必须为正数 (当前值：{value})");
+        }
+    }
+
+    /// <summary>
+    /// 验证正数无符号整数值
+    /// </summary>
+    private static void ValidatePositiveValue(uint value, string fieldName, List<string> errors)
+    {
+        if (value <= 0)
+        {
+            errors.Add($"{fieldName} 必须为正数 (当前值：{value})");
+        }
+    }
+
+    /// <summary>
+    /// 验证 MD5 格式是否有效
+    /// </summary>
+    private static bool IsValidMd5(string md5)
+    {
+        if (string.IsNullOrWhiteSpace(md5) || md5.Length != 32)
+        {
+            return false;
+        }
+
+        return md5.All(c => (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'));
+    }
+}
diff --git a/src/Core/AudioFileScanner.cs b/src/Core/AudioFileScanner.cs
new file mode 100644
index 0000000..4982f31
--- /dev/null
+++ b/src/Core/AudioFileScanner.cs
@@ -0,0 +1,49 @@
+namespace OCES.Resonance.Core;
+
+/// <summary>
+/// 音频文件扫描器，负责递归扫描目录并识别音频文件
+/// </summary>
+public class AudioFileScanner
+{
+    private static readonly string[] SupportedExtensions = 
+    { 
+        ".wav", ".mp3", ".flac", ".aiff", ".aif", ".m4a", ".ogg", ".wma", ".bwf", ".wav64" 
+    };
+
+    /// <summary>
+    /// 扫描指定目录，返回所有音频文件路径
+    /// </summary>
+    /// <param name="directoryPath">要扫描的目录路径</param>
+    /// <param name="recursive">是否递归扫描子目录</param>
+    /// <returns>音频文件路径集合</returns>
+    public IEnumerable<string> ScanDirectory(string directoryPath, bool recursive = true)
+    {
+        if (!Directory.Exists(directoryPath))
+        {
+            throw new DirectoryNotFoundException($"目录不存在：{directoryPath}");
+        }
+
+        var searchOption = recursive ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
+        
+        return SupportedExtensions
+            .SelectMany(ext => Directory.EnumerateFiles(directoryPath, $"*{ext}", searchOption))
+            .Where(IsSupportedAudioFile)
+            .Distinct(StringComparer.OrdinalIgnoreCase);
+    }
+
+    /// <summary>
+    /// 判断文件是否为支持的音频格式
+    /// </summary>
+    /// <param name="filePath">文件路径</param>
+    /// <returns>是否为支持的音频格式</returns>
+    public bool IsSupportedAudioFile(string filePath)
+    {
+        if (string.IsNullOrWhiteSpace(filePath))
+        {
+            return false;
+        }
+
+        var extension = Path.GetExtension(filePath).ToLowerInvariant();
+        return SupportedExtensions.Contains(extension);
+    }
+}
diff --git a/src/Core/AudioLibraryService.cs b/src/Core/AudioLibraryService.cs
new file mode 100644
index 0000000..f9144a0
--- /dev/null
+++ b/src/Core/AudioLibraryService.cs
@@ -0,0 +1,135 @@
+namespace OCES.Resonance.Core;
+
+/// <summary>
+/// 音频库管理服务，协调扫描、读取和入库的完整流程
+/// </summary>
+public class AudioLibraryService
+{
+    private readonly AudioFileScanner _scanner;
+    private readonly AudioMetadataReader _metadataReader;
+
+    public AudioLibraryService()
+    {
+        _scanner = new AudioFileScanner();
+        _metadataReader = new AudioMetadataReader();
+    }
+
+    /// <summary>
+    /// 扫描目录并将结果添加到数据库
+    /// </summary>
+    /// <param name="directoryPath">要扫描的目录路径</param>
+    /// <param name="databaseName">数据库名称（不含扩展名）</param>
+    /// <param name="skipExisting">是否跳过已存在的文件</param>
+    /// <returns>扫描结果统计</returns>
+    public async Task<ScanResult> ScanAndImportToLibrary(
+        string directoryPath, 
+        string databaseName = "default",
+        bool skipExisting = true)
+    {
+        var result = new ScanResult
+        {
+            TotalFiles = 0,
+            SuccessCount = 0,
+            SkipCount = 0,
+            ErrorCount = 0,
+            Errors = new List<string>()
+        };
+
+        // 初始化数据库
+        Database.InitializeDatabase();
+
+        // 扫描所有音频文件
+        var audioFiles = _scanner.ScanDirectory(directoryPath).ToList();
+        result.TotalFiles = audioFiles.Count;
+
+        if (audioFiles.Count == 0)
+        {
+            return result;
+        }
+
+        var metadataList = new List<AudioFileMeta>();
+
+        // 读取每个文件的元数据
+        foreach (var filePath in audioFiles)
+        {
+            try
+            {
+                // 计算 MD5 用于查重
+                var md5 = CalculateMd5ForFile(filePath);
+
+                // 检查是否已存在
+                if (skipExisting && Database.EntryExists(md5, filePath))
+                {
+                    result.SkipCount++;
+                    continue;
+                }
+
+                // 读取元数据
+                var metadata = _metadataReader.ReadMetadata(filePath);
+                metadataList.Add(metadata);
+                result.SuccessCount++;
+            }
+            catch (Exception ex)
+            {
+                result.ErrorCount++;
+                result.Errors.Add($"读取失败 {filePath}: {ex.Message}");
+            }
+        }
+
+        // 批量入库
+        if (metadataList.Count > 0)
+        {
+            try
+            {
+                Database.AddEntries(metadataList);
+            }
+            catch (Exception ex)
+            {
+                result.Errors.Add($"批量入库失败：{ex.Message}");
+                throw;
+            }
+        }
+
+        return await Task.FromResult(result);
+    }
+
+    /// <summary>
+    /// 计算文件 MD5（用于查重，不创建完整 AudioFileMeta 对象）
+    /// </summary>
+    private static string CalculateMd5ForFile(string filePath)
+    {
+        using var md5 = System.Security.Cryptography.MD5.Create();
+        using var stream = File.OpenRead(filePath);
+        var hash = md5.ComputeHash(stream);
+        return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
+    }
+}
+
+/// <summary>
+/// 扫描结果统计
+/// </summary>
+public class ScanResult
+{
+    /// <summary>扫描到的文件总数</summary>
+    public int TotalFiles { get; set; }
+
+    /// <summary>成功入库的文件数</summary>
+    public int SuccessCount { get; set; }
+
+    /// <summary>跳过的文件数（已存在）</summary>
+    public int SkipCount { get; set; }
+
+    /// <summary>读取失败的文件数</summary>
+    public int ErrorCount { get; set; }
+
+    /// <summary>错误详情列表</summary>
+    public List<string> Errors { get; set; } = new();
+
+    /// <summary>
+    /// 获取人类可读的统计报告
+    /// </summary>
+    public string GetSummary()
+    {
+        return $"扫描完成：共 {TotalFiles} 个文件，成功 {SuccessCount} 个，跳过 {SkipCount} 个，失败 {ErrorCount} 个";
+    }
+}
diff --git a/src/Core/AudioMetadataReader.cs b/src/Core/AudioMetadataReader.cs
new file mode 100644
index 0000000..fcdb4c8
--- /dev/null
+++ b/src/Core/AudioMetadataReader.cs
@@ -0,0 +1,173 @@
+using System.Security.Cryptography;
+using ATL;
+
+namespace OCES.Resonance.Core;
+
+/// <summary>
+/// 音频元数据读取器，使用 ATL 库读取音频文件的技术参数和元数据
+/// </summary>
+public class AudioMetadataReader
+{
+    /// <summary>
+    /// 从音频文件读取元数据
+    /// </summary>
+    /// <param name="filePath">音频文件路径</param>
+    /// <returns>音频元数据对象</returns>
+    public AudioFileMeta ReadMetadata(string filePath)
+    {
+        if (!File.Exists(filePath))
+        {
+            throw new FileNotFoundException($"文件不存在：{filePath}");
+        }
+
+        var track = new Track(filePath);
+        var fileInfo = new FileInfo(filePath);
+
+        // 获取音频技术参数
+        var durationSeconds = track.DurationMs / 1000.0;
+        var sampleRate = track.SampleRate;
+        var channels = track.ChannelsArrangement?.NbChannels ?? 2;
+        var bitDepth = GetBitDepth(track);
+        var totalSamples = (uint)(durationSeconds * sampleRate);
+
+        // 提取路径信息
+        var fileName = Path.GetFileName(filePath);
+        var folder = Path.GetDirectoryName(filePath) ?? string.Empty;
+        var directory = Path.GetDirectoryName(filePath) ?? string.Empty;
+        var folderName = new DirectoryInfo(folder).Name;
+
+        // 生成唯一标识
+        var md5 = CalculateMd5(filePath);
+        var uniqueId = GenerateUuid();
+
+        // 获取文件修改时间
+        var lastWriteTime = fileInfo.LastWriteTime;
+        var createTime = fileInfo.CreationTime;
+
+        // 获取文件扩展名作为类型
+        var fileType = Path.GetExtension(filePath).TrimStart('.').ToUpperInvariant();
+
+        // 映射 ATL 元数据到 AudioFileMeta
+        var meta = new AudioFileMeta
+        {
+            // 必备条目
+            Id = 0, // 自增 ID，由数据库生成
+            UniqueId = uniqueId,
+            Md5 = md5,
+            Path = Path.GetFullPath(filePath),
+            Filename = fileName,
+            Folder = folderName,
+            Directory = directory,
+            Duration = durationSeconds,
+            TotalSamples = totalSamples,
+            BitDepth = bitDepth,
+            Channels = channels,
+            SampleRate = (int)sampleRate,
+            Type = fileType,
+            DateAdded = DateTime.Now,
+            OriginalModificationDate = lastWriteTime,
+            OriginationTime = createTime,
+
+            // 可选条目
+            Bpm = track.BPM > 0 ? track.BPM : null,
+            Description = track.Description,
+            Genre = track.Genre,
+            Artist = track.Artist,
+            Composer = track.Composer,
+            Publisher = track.Publisher,
+            Copyright = track.Copyright,
+            
+            // BWF 特定字段 (通过附加数据获取)
+            CodingHistory = GetBwfField(track, "CodingHistory"),
+            Originator = GetBwfField(track, "Originator"),
+            OriginatorRef = GetBwfField(track, "OriginatorRef"),
+        };
+
+        return meta;
+    }
+
+    /// <summary>
+    /// 获取 BWF 字段值
+    /// </summary>
+    private static string? GetBwfField(Track track, string fieldName)
+    {
+        try
+        {
+            if (track.AdditionalFields != null && track.AdditionalFields.TryGetValue(fieldName, out string? field))
+            {
+                return field;
+            }
+        }
+        catch
+        {
+            // 忽略 BWF 字段读取错误
+        }
+        return null;
+    }
+
+    /// <summary>
+    /// 获取自定义字段值
+    /// </summary>
+    private static string? GetCustomField(Track track, int index)
+    {
+        try
+        {
+            string fieldName = $"User{index}";
+            if (track.AdditionalFields != null && track.AdditionalFields.TryGetValue(fieldName, out string? field))
+            {
+                return field;
+            }
+        }
+        catch
+        {
+            // 忽略自定义字段读取错误
+        }
+        return null;
+    }
+
+    /// <summary>
+    /// 获取音频位深度
+    /// </summary>
+    private static int GetBitDepth(Track track)
+    {
+        // ATL 可能通过不同方式提供位深信息
+        if (track.BitDepth > 0)
+        {
+            return track.BitDepth;
+        }
+
+        // 根据格式推断默认位深
+        var extension = Path.GetExtension(track.Path).ToLowerInvariant();
+        return extension switch
+        {
+            ".wav" or ".bwf" or ".wav64" => 24, // 现代 WAV 通常 24bit
+            ".flac" => 24,
+            ".aiff" or ".aif" => 16,
+            ".mp3" => 16, // MP3 实际没有位深概念，默认 16
+            _ => 16
+        };
+    }
+
+    /// <summary>
+    /// 计算文件 MD5 值
+    /// </summary>
+    /// <param name="filePath">文件路径</param>
+    /// <returns>MD5 哈希值（十六进制字符串）</returns>
+    private static string CalculateMd5(string filePath)
+    {
+        using var md5 = MD5.Create();
+        using var stream = File.OpenRead(filePath);
+        
+        var hash = md5.ComputeHash(stream);
+        return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
+    }
+
+    /// <summary>
+    /// 生成 UUID
+    /// </summary>
+    /// <returns>UUID 字符串</returns>
+    private static string GenerateUuid()
+    {
+        return Guid.NewGuid().ToString("N"); // 无连字符的 UUID
+    }
+}
diff --git a/src/Core/Database.cs b/src/Core/Database.cs
index e53d385..461620b 100644
--- a/src/Core/Database.cs
+++ b/src/Core/Database.cs
@@ -1,9 +1,239 @@
+using System.Data;
+using System.Data.SQLite;
+using Dapper;
+
 namespace OCES.Resonance.Core;
 
 public static class Database
 {
-    internal static bool AddEntry()
+    static readonly string DefaultConnectionString = "Data Source=default.db;Version=3;";
+    
+    /// <summary>
+    /// 获取数据库连接
+    /// </summary>
+    /// <param name="dbName">数据库名称（不含扩展名）</param>
+    /// <returns>数据库连接</returns>
+    public static IDbConnection GetConnection(string dbName = "default")
     {
-        return false;
+        var connectionString = $"Data Source={dbName}.db;Version=3;";
+        return new SQLiteConnection(connectionString);
+    }
+    
+    /// <summary>
+    /// 初始化数据库表结构
+    /// </summary>
+    public static void InitializeDatabase()
+    {
+        using var connection = GetConnection();
+        connection.Open();
+        
+        const string sql = @"
+            CREATE TABLE IF NOT EXISTS audio_files (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                unique_id TEXT NOT NULL UNIQUE,
+                short_id TEXT,
+                md5 TEXT NOT NULL,
+                path TEXT NOT NULL,
+                filename TEXT NOT NULL,
+                folder TEXT NOT NULL,
+                directory TEXT NOT NULL,
+                duration REAL NOT NULL,
+                total_samples INTEGER NOT NULL,
+                bit_depth INTEGER NOT NULL,
+                channels INTEGER NOT NULL,
+                sample_rate INTEGER NOT NULL,
+                type TEXT NOT NULL,
+                date_added TEXT NOT NULL,
+                original_modification_date TEXT NOT NULL,
+                origination_time TEXT NOT NULL,
+                
+                bpm REAL,
+                frame_rate TEXT,
+                timecode INTEGER,
+                description TEXT,
+                category TEXT,
+                subcategory TEXT,
+                cat_id TEXT,
+                category_full TEXT,
+                genre TEXT,
+                style TEXT,
+                mood TEXT,
+                keywords TEXT,
+                rating INTEGER,
+                artist TEXT,
+                composer TEXT,
+                designer TEXT,
+                recordist TEXT,
+                publisher TEXT,
+                manufacturer TEXT,
+                originator TEXT,
+                originator_ref TEXT,
+                project_name TEXT,
+                library TEXT,
+                cd_title TEXT,
+                track_title TEXT,
+                episode TEXT,
+                scene TEXT,
+                take TEXT,
+                tape TEXT,
+                cue_number INTEGER,
+                sync_point INTEGER,
+                release_date TEXT,
+                track_year TEXT,
+                is_edited INTEGER,
+                is_split INTEGER,
+                location TEXT,
+                group TEXT,
+                markers TEXT,
+                comments TEXT,
+                notes TEXT,
+                copyright TEXT,
+                coding_history TEXT,
+                microphone TEXT,
+                mic_perspective TEXT,
+                user1 TEXT,
+                user2 TEXT,
+                user3 TEXT,
+                user4 TEXT,
+                user5 TEXT,
+                user6 TEXT,
+                user7 TEXT,
+                user8 TEXT,
+                
+                INDEX idx_md5 (md5),
+                INDEX idx_path (path),
+                INDEX idx_unique_id (unique_id)
+            );
+        ";
+        
+        connection.Execute(sql);
+    }
+    
+    /// <summary>
+    /// 添加单条音频记录
+    /// </summary>
+    /// <param name="meta">音频元数据</param>
+    /// <returns>是否添加成功</returns>
+    public static bool AddEntry(AudioFileMeta meta)
+    {
+        try
+        {
+            using var connection = GetConnection();
+            connection.Open();
+            
+            const string sql = @"
+                INSERT INTO audio_files (
+                    unique_id, short_id, md5, path, filename, folder, directory,
+                    duration, total_samples, bit_depth, channels, sample_rate, type,
+                    date_added, original_modification_date, origination_time,
+                    bpm, frame_rate, timecode, description, category, subcategory,
+                    cat_id, category_full, genre, style, mood, keywords, rating,
+                    artist, composer, designer, recordist, publisher, manufacturer,
+                    originator, originator_ref, project_name, library, cd_title,
+                    track_title, episode, scene, take, tape, cue_number, sync_point,
+                    release_date, track_year, is_edited, is_split, location, group,
+                    markers, comments, notes, copyright, coding_history, microphone,
+                    mic_perspective, user1, user2, user3, user4, user5, user6, user7, user8
+                ) VALUES (
+                    @UniqueId, @ShortId, @Md5, @Path, @Filename, @Folder, @Directory,
+                    @Duration, @TotalSamples, @BitDepth, @Channels, @SampleRate, @Type,
+                    @DateAdded, @OriginalModificationDate, @OriginationTime,
+                    @Bpm, @FrameRate, @Timecode, @Description, @Category, @Subcategory,
+                    @CatId, @CategoryFull, @Genre, @Style, @Mood, @Keywords, @Rating,
+                    @Artist, @Composer, @Designer, @Recordist, @Publisher, @Manufacturer,
+                    @Originator, @OriginatorRef, @ProjectName, @Library, @CdTitle,
+                    @TrackTitle, @Episode, @Scene, @Take, @Tape, @CueNumber, @SyncPoint,
+                    @ReleaseDate, @TrackYear, @IsEdited, @IsSplit, @Location, @Group,
+                    @Markers, @Comments, @Notes, @Copyright, @CodingHistory, @Microphone,
+                    @MicPerspective, @User1, @User2, @User3, @User4, @User5, @User6, @User7, @User8
+                );
+            ";
+            
+            connection.Execute(sql, meta);
+            return true;
+        }
+        catch (Exception)
+        {
+            return false;
+        }
+    }
+    
+    /// <summary>
+    /// 批量添加音频记录
+    /// </summary>
+    /// <param name="entries">音频元数据列表</param>
+    /// <returns>成功添加的记录数</returns>
+    public static int AddEntries(IEnumerable<AudioFileMeta> entries)
+    {
+        var count = 0;
+        using var connection = GetConnection();
+        connection.Open();
+        
+        using var transaction = connection.BeginTransaction();
+        try
+        {
+            const string sql = @"
+                INSERT INTO audio_files (
+                    unique_id, short_id, md5, path, filename, folder, directory,
+                    duration, total_samples, bit_depth, channels, sample_rate, type,
+                    date_added, original_modification_date, origination_time,
+                    bpm, frame_rate, timecode, description, category, subcategory,
+                    cat_id, category_full, genre, style, mood, keywords, rating,
+                    artist, composer, designer, recordist, publisher, manufacturer,
+                    originator, originator_ref, project_name, library, cd_title,
+                    track_title, episode, scene, take, tape, cue_number, sync_point,
+                    release_date, track_year, is_edited, is_split, location, group,
+                    markers, comments, notes, copyright, coding_history, microphone,
+                    mic_perspective, user1, user2, user3, user4, user5, user6, user7, user8
+                ) VALUES (
+                    @UniqueId, @ShortId, @Md5, @Path, @Filename, @Folder, @Directory,
+                    @Duration, @TotalSamples, @BitDepth, @Channels, @SampleRate, @Type,
+                    @DateAdded, @OriginalModificationDate, @OriginationTime,
+                    @Bpm, @FrameRate, @Timecode, @Description, @Category, @Subcategory,
+                    @CatId, @CategoryFull, @Genre, @Style, @Mood, @Keywords, @Rating,
+                    @Artist, @Composer, @Designer, @Recordist, @Publisher, @Manufacturer,
+                    @Originator, @OriginatorRef, @ProjectName, @Library, @CdTitle,
+                    @TrackTitle, @Episode, @Scene, @Take, @Tape, @CueNumber, @SyncPoint,
+                    @ReleaseDate, @TrackYear, @IsEdited, @IsSplit, @Location, @Group,
+                    @Markers, @Comments, @Notes, @Copyright, @CodingHistory, @Microphone,
+                    @MicPerspective, @User1, @User2, @User3, @User4, @User5, @User6, @User7, @User8
+                );
+            ";
+            
+            foreach (var entry in entries)
+            {
+                connection.Execute(sql, entry, transaction);
+                count++;
+            }
+            
+            transaction.Commit();
+        }
+        catch (Exception)
+        {
+            transaction.Rollback();
+            throw;
+        }
+        
+        return count;
+    }
+    
+    /// <summary>
+    /// 检查记录是否已存在
+    /// </summary>
+    /// <param name="md5">文件 MD5 值</param>
+    /// <param name="filePath">文件路径</param>
+    /// <returns>是否存在</returns>
+    public static bool EntryExists(string md5, string filePath)
+    {
+        using var connection = GetConnection();
+        connection.Open();
+        
+        const string sql = @"
+            SELECT COUNT(*) FROM audio_files 
+            WHERE md5 = @Md5 OR path = @Path;
+        ";
+        
+        var count = connection.ExecuteScalar<int>(sql, new { Md5 = md5, Path = filePath });
+        return count > 0;
     }
 }