通过SQL语句如何向image字段更新

SQL code

UPDATE YX_TASK_ATTACHSET    TASK_CD = 'EML',       SCHEDULELDID = 'TASK257',       IMG_EDM = 'System.Byte[]',       ↑↑↑↑↑↑↑↑↑↑↑↑↑ ※IMG_EDM是image类型       UPDATE_DT = '2011-12-26 16:56:22'WHERE SCHEDULELDID = 'TASK257'

请问以上如何更新

[解决办法]
将IMG_EDM用文件流的方式读取出来,然后用updateblob 的方式更新image类型的字段.
[解决办法]
给我我用的：

C# code

    img = Image.FromFile(@"c:\test.jpg");    MemoryStream ms = new MemoryStream();    img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);    byte[] myData = ms.ToArray();    SqlConnection cn = new SqlConnection("Data Source=(local);Initial Catalog=utscadadb;Integrated Security=SSPI; User Id=sa;Password=ut2001;");    SqlCommand cmd = new SqlCommand("Update Table1 Set file=(@file),data = (@data) where id =3", cn);    cmd.Parameters.Add("@file ", SqlDbType.VarChar).Value = "d:\\test.jpg";    cmd.Parameters.Add("@data ", SqlDbType.Image).Value = myData;    cn.Open();    cmd.ExecuteNonQuery();    cn.Close();