ZVe*_*nue 8 .net c# nosql ravendb
我有一个文件输入控件.
<input type="file" name="file" id="SaveFileToDB"/>
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让我们说我浏览到C:/Instruction.pdf文档并单击提交.在提交时,我想将文档保存在RavenDB中,稍后将其检索以供下载.我看到这个链接http://ravendb.net/docs/client-api/attachments 说...做这个..
Stream data = new MemoryStream(new byte[] { 1, 2, 3 });
documentStore.DatabaseCommands.PutAttachment("videos/2", null, data,
new RavenJObject {{"Description", "Kids play in the garden"}});
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我不遵循1,2,3这里的意思以及在命令中说视频/ 2意味着什么...我如何在我的情况下使用这两行来保存word/pdf在ravendb中.如果有人以前做过这样的事情,请告知.
我不清楚一件事......附件是如何存储的.如果我想存储附件本身(比如pdf),它会独立存储在ravendb ..我只是将附件的密钥存储在与之关联的主文档中?如果是这样的话,pdf在物理上存储在ravendb中的哪个位置?我可以看吗?
Sha*_* C. 11
1,2,3只是示例数据.它试图获得的是你创建一个你想要的内存流然后在PutAttachment方法中使用该内存流.以下是临时的,未经测试但应该有效:
using (var mem = new MemoryStream(file.InputStream)
{
_documentStore.DatabaseCommands.PutAttachment("upload/" + YourUID, null, mem,
new RavenJObject
{
{ "OtherData", "Can Go here" },
{ "MoreData", "Here" }
});
}
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编辑了其余的问题
编辑已更正和更新的示例
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Upload(HttpPostedFileBase file)
{
byte[] bytes = ReadToEnd(file.InputStream);
var id = "upload/" + DateTime.Now.Second.ToString(CultureInfo.InvariantCulture);
using (var mem = new MemoryStream(bytes))
{
DocumentStore.DatabaseCommands.PutAttachment(id, null, mem,
new RavenJObject
{
{"OtherData", "Can Go here"},
{"MoreData", "Here"},
{"ContentType", file.ContentType}
});
}
return Content(id);
}
public FileContentResult GetFile(string id)
{
var attachment = DocumentStore.DatabaseCommands.GetAttachment("upload/" + id);
return new FileContentResult(ReadFully(attachment.Data()), attachment.Metadata["ContentType"].ToString());
}
public static byte[] ReadToEnd(Stream stream)
{
long originalPosition = 0;
if (stream.CanSeek)
{
originalPosition = stream.Position;
stream.Position = 0;
}
try
{
var readBuffer = new byte[4096];
int totalBytesRead = 0;
int bytesRead;
while ((bytesRead = stream.Read(readBuffer, totalBytesRead, readBuffer.Length - totalBytesRead)) > 0)
{
totalBytesRead += bytesRead;
if (totalBytesRead == readBuffer.Length)
{
int nextByte = stream.ReadByte();
if (nextByte != -1)
{
var temp = new byte[readBuffer.Length*2];
Buffer.BlockCopy(readBuffer, 0, temp, 0, readBuffer.Length);
Buffer.SetByte(temp, totalBytesRead, (byte) nextByte);
readBuffer = temp;
totalBytesRead++;
}
}
}
byte[] buffer = readBuffer;
if (readBuffer.Length != totalBytesRead)
{
buffer = new byte[totalBytesRead];
Buffer.BlockCopy(readBuffer, 0, buffer, 0, totalBytesRead);
}
return buffer;
}
finally
{
if (stream.CanSeek)
{
stream.Position = originalPosition;
}
}
}
public static byte[] ReadFully(Stream input)
{
byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
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它作为二进制数据存储在RavenDB中.它不存储为json.
这里没有文档,您有一些与附件关联的元数据,它不是一个seaprate文档.
是的,没有办法查询.
是
只有当你直接去附件时,例如 http://localhost:8080/static/ATTACHMENT_KEY
它不会在UI中显示