Backup/Discuz.Data/DataProvider/Attachments.cs

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using System;
using System.Text;
using System.Data;
using System.IO;

using Discuz.Entity;
using Discuz.Config;
using Discuz.Common;
using Discuz.Common.Generic;
using Discuz.Cache.Data;

namespace Discuz.Data
{
    /// <summary>
    /// 附件数据操作类
    /// </summary>
    public class Attachments
    {
        /// <summary>
        /// 是否启用TokyoTyrantCache缓存用户表
        /// </summary>
        public static bool appDBCache = (EntLibConfigs.GetConfig() != null && EntLibConfigs.GetConfig().Cacheattachments.Enable);

        public static ICacheAttachments IAttachmentService = appDBCache ? DBCacheService.GetAttachmentsService() : null;



        /// <summary>
        /// 产生附件
        /// </summary>
        /// <param name="attachmentinfo">附件描述类</param>
        /// <returns>附件id</returns>
        public static int CreateAttachments(AttachmentInfo attachmentinfo)
        {
            attachmentinfo.Aid = DatabaseProvider.GetInstance().CreateAttachment(attachmentinfo);

            if (appDBCache)
                IAttachmentService.CreateAttachments(attachmentinfo);

            return attachmentinfo.Aid;
        }

        /// <summary>
        /// 获得指定附件的描述信息
        /// </summary>
        /// <param name="aid">附件id</param>
        /// <returns>描述信息</returns>
        public static AttachmentInfo GetAttachmentInfo(int aid)
        {
            if (appDBCache)
            {
                AttachmentInfo attachmentInfo = IAttachmentService.GetAttachmentInfo(aid);
                if (attachmentInfo != null)
                    return attachmentInfo;
            }

            return LoadSingleAttachmentInfo(DatabaseProvider.GetInstance().GetAttachmentInfo(aid), true);
        }

        /// <summary>
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