Question

我的问题如下：我尝试使用此方法将Excel文件上传到数据库：

using (SqlConnection connection = new SqlConnection(@"Data Source=TESZT1\SQLEXPRESS;Initial Catalog=Alepitmeny;Persist Security Info=True;User ID=sa;Password=*****"))
using (SqlCommand command = connection.CreateCommand())
{
    byte[] file;

    using (var stream = new FileStream(ExcelFilePath, FileMode.Open, FileAccess.Read))
    {
        using (var reader = new BinaryReader(stream))
        {
            file = reader.ReadBytes((int)stream.Length);
        }
    }

    command.CommandText = "INSERT INTO Dokumentacio (Elrendelo_ExcelFile) VALUES (@File) SELECT SCOPE_IDENTITY()";
    command.Parameters.Add("@File", SqlDbType.VarBinary, file.Length).Value = file;

    connection.Open();
    this.dokumentacio_Class.Dokumentacio_ID = Convert.ToInt32(command.ExecuteScalar());
    connection.Close();
}

但是当我使用下面的方法下载上传的文件时，我收到一条错误消息

Excel在filename.xls中找到了不可读的内容。是否要恢复此工作簿的内容？

来自Microsoft Excel，它无法恢复。

（我使用SQL Server 2012，Visual Studio 2013，该项目是WPF项目，我的Office版本是2013）

在数据库中，Elrendelo_ExcelFile列为VARBINARY(MAX)

    public bool ElrendeloExcelFileLetolt(string SavePath)
    {
       using (SqlConnection connection = new SqlConnection(@"Data Source=TESZT1\SQLEXPRESS;Initial Catalog=Alepitmeny;Persist Security Info=True;User ID=sa;Password=*****"))
           try
           {
                using (SqlCommand command = connection.CreateCommand())
                {
                    command.CommandText = @"SELECT d.Elrendelo_ExcelFile FROM Dokumentacio d INNER JOIN Kapcsolotabla k ON k.Dokumentacio_ID=d.Dokumentacio_ID WHERE k.Elrendelo_ID=@id";
                    command.Parameters.AddWithValue("@id", this.dokumentacio_ID);
                    FileStream stream;
                    BinaryWriter writer;

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

                    long retval;
                    long startIndex = 0;

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

                    while (reader.Read())
                    {
                        stream = new FileStream(SavePath, FileMode.OpenOrCreate, FileAccess.Write);
                        writer = new BinaryWriter(stream);
                        startIndex = 0;

                        retval = reader.GetBytes(0, startIndex, buffer, 0, bufferSize);

                        while (retval == bufferSize)
                        {
                            writer.Write(buffer);
                            writer.Flush();
                            startIndex += bufferSize;
                            retval = reader.GetBytes(0, startIndex, buffer, 0, bufferSize);
                        }

                        writer.Write(buffer, 0, (int)retval - 1);
                        writer.Flush();
                        writer.Close();

                        stream.Close();
                    }

                    reader.Close();
                    connection.Close();
                }

                return true;
            }
            catch (System.Data.SqlClient.SqlException)
            {
                return false;
            }
            finally
            {
                connection.Close();
            }
}

Answer 1

这个SO答案可以帮助你 - ＆gt; How do I insert/retrieve Excel files to varbinary(max) column in SQL Server 2008?

将文件上载到SQL Server，无法正确检索它

1 个答案: