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Question

我正在使用DocX创建.docx文件。与其将它们存储在硬盘、共享或SharePoint上，我更愿意将它们存储在store中。所以我的问题是：

1. 如何编写适当的代码将文件保存到数据库中？
2. 如何编写适当的代码将文件检索到数据库？
3. 应该设置什么样的数据类型来保存docx文件？是图像吗？

关于这一点，

MadBoy

PS。在使用旧的“学校”方式方面，我更倾向于使用适当的代码：

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。如何将其转换为二进制文件，然后保存为DB

下面的东西会起作用的

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();

检索的过程有点复杂，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();

有关帮助和详细信息，请参阅以下文章

储蓄

Retreival：

Answer 2

我知道它没有使用读取器，但是这里有一个示例来查询它并保存到磁盘中。把它放回原处，它只是一个插入或更新，传入一个byte[]。在sql中，数据类型将是varbinary。

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();

读者可能就像这样

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