sql 将文件转换为二进制上传（或下载）到数据库中

附件表结构如下:



上传附件:

/// <summary>
/// 上传附件
/// </summary>
/// <param name="filePath">上传文件路径</param>
/// <param name="strAttachmentId">返回附件ID</param>
/// <returns>true ：上传成功 ； false ：上传失败</returns>

private bool UploadAttachment(string filePath, out string strAttachmentId)
{

strAttachmentId = null;
if (string.IsNullOrEmpty(filePath))
{
return false;
}
//截取路径下的文件名
int index = filePath.LastIndexOf(@"\");
string fileName = string.Empty;
if (index > 0)
{
fileName = filePath.Substring(index + 1, filePath.Length - index - 1);
}
//将附件内容转换成二进制信息
FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
byte[] bufContent = new byte[stream.Length];
stream.Read(bufContent, 0, Convert.ToInt32(stream.Length));
stream.Flush();
stream.Close();

//三层架构 访问数据库代码

DBAccess.Model.attachment model = new DBAccess.Model.attachment();
strAttachmentId = Guid.NewGuid().ToString("D");
model.Id = strAttachmentId;
model.Name = fileName;
model.Content = bufContent;
model.UploadTime = DateTime.Now;

DBAccess.BLL.attachment bll = new DBAccess.BLL.attachment();
if (bll.Add(model) <= 0)
{
strAttachmentId = null;
return false;
}
return true;
}

下载附件：

/// <summary>
/// 下载附件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnDownload_Click(object sender, RoutedEventArgs e)
{
if (string.IsNullOrEmpty(tbAttachment.Text))
{
return;
}

//保存对话框
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Title = "下载附件";
saveFileDialog.Filter = "所有文件|*.*";
saveFileDialog.FileName = tbAttachment.Text.Trim();
saveFileDialog.RestoreDirectory = true;
if ((bool)saveFileDialog.ShowDialog().GetValueOrDefault())
{

//三层架构 访问数据库代码
DBAccess.BLL.attachment aBll = new DBAccess.BLL.attachment();
DBAccess.Model.attachment modelAt = aBll.GetModel(m_ModelProblemorder.AttachmentId);

//将数据库中的二进制转换为文件
FileStream fs = new FileStream(saveFileDialog.FileName, FileMode.Create, FileAccess.Write);
fs.Write(modelAt.Content, 0, modelAt.Content.Length);
fs.Flush();
fs.Close();
MessageBox.Show("下载成功!", "提示信息");
}
}

以上代码是上传，下载附件的主要代码，仅供参考~