Question

我正在尝试将文件上传到我的数据库（通过将二进制文件内容读入我的存储过程）。我将输入流传递给我的方法，如下所示：

LoadFile(gAttachmentContentID, file.InputStream, trn);

public static void LoadFile2(Guid gAttachmentContentID, Stream stm, IDbTransaction trn)
{
    stm.Position = 0;
    byte[] binFILE_POINTER = new byte[32];

    // Now read s into a byte buffer. 
    byte[] bytes = new byte[stm.Length];
    int numBytesToRead = (int)stm.Length;
    int numBytesRead = 0;
    while (numBytesToRead > 0)
    {
        // Read may return anything from 0 to 10. 
        int n = stm.Read(bytes, numBytesRead, 10);
        // The end of the file is reached. 
        if (n == 0)
        {
            break;
        }
        numBytesRead += n;
        numBytesToRead -= n;
    }
    stm.Close();
    SqlProcs.spATTACHMENTS_CONTENT_WriteOffset(gAttachmentContentID, binFILE_POINTER, 0, bytes, trn);
    // numBytesToRead should be 0 now, and numBytesRead should 
    // equal 100.
    Console.WriteLine("number of bytes read: {0:d}", numBytesRead);
}

使用此程序：

public static void spATTACHMENTS_CONTENT_WriteOffset(Guid gID, byte[] binFILE_POINTER, Int32 nFILE_OFFSET, byte[] byBYTES, IDbTransaction trn)
{
    IDbConnection con = trn.Connection;
    using ( IDbCommand cmd = con.CreateCommand() )
    {
        cmd.Transaction = trn;
        cmd.CommandType = CommandType.StoredProcedure;
        if ( Sql.IsOracle(cmd) )
            cmd.CommandText = "spATTACHMENTS_CONTENT_WriteOff";
        else
            cmd.CommandText = "spATTACHMENTS_CONTENT_WriteOffset";
        IDbDataParameter parID               = Sql.AddParameter(cmd, "@ID"              , gID                );
        IDbDataParameter parFILE_POINTER     = Sql.AddParameter(cmd, "@FILE_POINTER"    , binFILE_POINTER    );
        IDbDataParameter parMODIFIED_USER_ID = Sql.AddParameter(cmd, "@MODIFIED_USER_ID",  Security.USER_ID  );
        IDbDataParameter parFILE_OFFSET      = Sql.AddParameter(cmd, "@FILE_OFFSET"     , nFILE_OFFSET       );
        IDbDataParameter parBYTES            = Sql.AddParameter(cmd, "@BYTES"           , byBYTES            );
        cmd.ExecuteNonQuery();
    }
}

但是我收到以下错误：

无效的text，ntext或图像指针值0x00000000000000000000000000000000。

错误发生在我的存储过程方法的行cmd.ExecuteNonQuery();上。

存储过程：

Create Procedure dbo.spATTACHMENTS_CONTENT_WriteOffset
    ( @ID                   uniqueidentifier
    , @FILE_POINTER         binary(16)
    , @MODIFIED_USER_ID     uniqueidentifier
    , @FILE_OFFSET          int
    , @BYTES                image
    )
with encryption
as
  begin
    set nocount on

    -- 10/22/2005 Paul.  @ID is used in Oracle and MySQL. 
-- #if SQL_Server /*
    updatetext ATTACHMENTS_CONTENT.ATTACHMENT
               @FILE_POINTER
               @FILE_OFFSET
               null -- 0 deletes no data, null deletes all data from insertion point. 
               @BYTES;

谢谢。

Answer 1

由于每行只上传一个文件，因此使用正常的UPDATE而不是不必要地摆弄指针和偏移量会容易得多。命令可以这么简单：

UPDATE ATTACHMENTS_CONTENT SET ATTACHMENT = @BYTES Where ID=@ID

我不确定您的ID字段是什么，所以我只是写了ID，但我确信您可以用正确的ID替换它。

Answer 2

你还没有填写binFILE_POINTER []，所以它会充满零。

我猜这就是：

*Invalid text, ntext, or image pointer value 0x00000000000000000000000000000000.*

来自......

文本，ntext或图像指针值无效

2 个答案: