使用 C# 从 CouchDB 中获取大的二进制数据

Question

我使用 CouchDB 作为内容服务器来存储图像和大型视频文件问题是当我检索这些文件时，它表示为文档响应，它需要反序列化以获取二进制文件，这将导致 内存不足错误 （对于任何大于 300mb 的文件）。

这是上传功能

  public async Task<string> InsertDataToCouchDb(string dbName, string id, string recodNo, string filename, byte[] image)
    {
        var connection = System.Configuration.ConfigurationManager.ConnectionStrings["CouchDb"].ConnectionString;
        using (var db = new MyCouchClient(connection, dbName))
        {

            // HERE I NEED TO UPLOAD MY IMAGE BYTE[] AS CHUNKS 
            var artist = new couchdb
            {
                _id = id,
                filename = filename,
                Image = image
            };

            var response = await db.Entities.PutAsync(artist);
            return  response.Content._id;
        }

    }

下载功能

   public async Task<byte[]> FetchDataFromCouchDb(string dbName, string id)
    {
        var connection = System.Configuration.ConfigurationManager.ConnectionStrings["CouchDb"].ConnectionString;
        using (var db = new MyCouchClient(connection, dbName))
        {
            //HERE I NEED TO RETRIVE MY FULL IMAGE[] FROM CHUNKS
            var test = await db.Documents.GetAsync(id, null);

            var doc = db.Serializer.Deserialize<couchdb>(test.Content);
            return doc.Image;

        }
    }

我需要直接获取二进制数据而不像mongoDB GridFSBucket

那样进行任何反序列化

谢谢

Answer 1

您做错了，必须使用附件对象将附件与文档分开。

var response = await db.Entities.PutAsync(artist);//The document
                var request = new PutAttachmentRequest(
                    id,
                    response.Rev,//from the added document
                    "filename",
                    HttpContentTypes.Text,
                    filebytes);

                var xxx = await db.Attachments.PutAsync(request);

//这里是读取文件的方法 AttachmentResponse resAtt = await db.Attachments.GetAsync(id, "filename");

                var filebytes2 = resAtt.Content;//no deserialize

使用 C# 从 CouchDB 中获取大的二进制数据

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