first commot

Repository/EmailMessageRepository.cs

@@ -0,0 +1,64 @@
+namespace Repository;
+
+public interface IEmailMessageRepository : IBaseRepository<EmailMessage>
+{
+    Task<EmailMessage?> ExistsAsync(
+        string from,
+        string subject,
+        DateTime receivedDate,
+        string body);
+    
+    /// <summary>
+    /// 分页获取邮件列表（游标分页）
+    /// </summary>
+    /// <param name="lastReceivedDate">上一页最后一条记录的接收时间</param>
+    /// <param name="lastId">上一页最后一条记录的ID</param>
+    /// <param name="pageSize">每页数量</param>
+    /// <returns>邮件列表、最后接收时间和最后ID</returns>
+    Task<(List<EmailMessage> list, DateTime? lastReceivedDate, long lastId)> GetPagedListAsync(DateTime? lastReceivedDate, long? lastId, int pageSize = 20);
+    
+    /// <summary>
+    /// 获取总数
+    /// </summary>
+    Task<long> GetTotalCountAsync();
+}
+
+public class EmailMessageRepository(IFreeSql freeSql) : BaseRepository<EmailMessage>(freeSql), IEmailMessageRepository
+{
+    public async Task<EmailMessage?> ExistsAsync(
+        string from,
+        string subject,
+        DateTime receivedDate,
+        string body)
+    {
+        return await FreeSql.Select<EmailMessage>()
+            .Where(m => m.From == from && m.Subject == subject && m.ReceivedDate == receivedDate && m.Body == body)
+            .FirstAsync();
+    }
+
+    public async Task<(List<EmailMessage> list, DateTime? lastReceivedDate, long lastId)> GetPagedListAsync(DateTime? lastReceivedDate, long? lastId, int pageSize = 20)
+    {
+        var query = FreeSql.Select<EmailMessage>();
+        
+        // 如果提供了游标，则获取小于游标位置的记录
+        if (lastReceivedDate.HasValue && lastId.HasValue)
+        {
+            query = query.Where(e => e.ReceivedDate < lastReceivedDate.Value || 
+                                     (e.ReceivedDate == lastReceivedDate.Value && e.Id < lastId.Value));
+        }
+        
+        var list = await query
+            .OrderByDescending(e => e.ReceivedDate)
+            .OrderByDescending(e => e.Id)
+            .Page(1, pageSize)
+            .ToListAsync();
+        
+        var lastRecord = list.Count > 0 ? list.Last() : null;
+        return (list, lastRecord?.ReceivedDate, lastRecord?.Id ?? 0);
+    }
+
+    public async Task<long> GetTotalCountAsync()
+    {
+        return await FreeSql.Select<EmailMessage>().CountAsync();
+    }
+}