Question

我正在使用DocX创建.docx文件。而不是将它们存储在硬盘驱动器上，Share或SharePoint我宁愿将它们存储在SQL数据库中。所以我的问题是：

如何编写正确的代码以将文件保存到该数据库？
如何编写正确的代码以将文件检索到该数据库？
我应该为表格设置哪种数据类型来保存docx文件？是图像吗？

关于，

MadBoy

PS。在使用旧的“学校”方式方面，我更喜欢使用正确的代码：

using (var varConnection = Locale.sqlConnectOneTime(Locale.sqlDataConnectionDetailsDepozyt))
using (var sqlQuery = new SqlCommand(preparedCommand, varConnection))
using (var sqlQueryResult = sqlQuery.ExecuteReader())
    while (sqlQueryResult != null && sqlQueryResult.Read())

Answer 1

docx文件就像一个zip文件，它是几个文件的集合。如何转换为二进制文件然后保存到DB

以下内容将起作用

保存

        string filePath = "";
        string connectionString = "";
        FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
        BinaryReader reader = new BinaryReader(stream);
        byte[] file = reader.ReadBytes((int)stream.Length);
        reader.Close();
        stream.Close();

        SqlCommand command;
        SqlConnection connection = new SqlConnection(connectionString);
        command = new SqlCommand("INSERT INTO FileTable (File) Values(@File)", connection);
        command.Parameters.Add("@File", SqlDbType.Binary, file.Length).Value = file;
        connection.Open();
        command.ExecuteNonQuery();

检索是一个有点复杂的过程，如下所示

            SqlConnection connection = new SqlConnection("");
            string query = 
            @" SELECT File FROM FileTable where FileID =" + 125;
            SqlCommand command = new SqlCommand(query, connection);

            FileStream stream;
            BinaryWriter writer;

            int bufferSize = 100;
            byte[] outByte = new byte[bufferSize];

            long retval;
            long startIndex = 0;

            string pubID = "";

            connection.Open();
            SqlDataReader reader = command.ExecuteReader(CommandBehavior.Default);

            while (reader.Read())
            {    
                pubID = reader.GetString(0);

                stream = 
                new FileStream("abc.docx", FileMode.OpenOrCreate, FileAccess.Write);
                writer = new BinaryWriter(stream);
                startIndex = 0;
                retval = reader.GetBytes(1, startIndex, outByte, 0, bufferSize);

                while (retval == bufferSize)
                {
                    writer.Write(outByte);
                    writer.Flush();
                    startIndex += bufferSize;
                    retval = reader.GetBytes(1, startIndex, outByte, 0, bufferSize);
                }
                writer.Write(outByte, 0, (int)retval - 1);
                writer.Flush();
                writer.Close();
                stream.Close();
            } reader.Close();
            connection.Close();

请查看以下文章以获取帮助和详细信息

<强>保存：

http://msdn.microsoft.com/en-us/library/4f5s1we0(VS.80).aspx

Retreival ：

http://msdn.microsoft.com/en-us/library/87z0hy49(VS.80).aspx

Answer 2

我知道它不是使用读者，但这是一个查询它并保存到磁盘的示例。要把它放回去，它只是一个插入或更新传递一个byte []。数据类型在sql中是varbinary max。

SqlConnection connection = new SqlConnection ("...");
    connection.Open ();
    SqlCommand command = new 
      SqlCommand ("select...e", connection);
    byte[] buffer = (byte[]) command.ExecuteScalar ();
    connection.Close();
    FileStream fs = new FileStream(@"C:\test.pdf", FileMode.Create);
    fs.Write(buffer, 0, buffer.Length);
    fs.Close();

读者可能是这样的

while (myReader.Read())
        {
            byte[] file = myReader.GetBytes(0));
            // might be 
            file = (byte[])GetValue(0);
        }

从WinForms C＃app上传/下载SQL Server 2005/2008中的文件？

2 个答案: