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把RichTextBox中的文本保存到Sql Server中(C#)

2008-04-28 15:12 330 查看
private void btnSave_Click(object sender, System.EventArgs e)
   {
  
   FileStream stream = null;
   SqlConnection conn = null;
   SqlCommand cmd = null;
   try
   {
   richTextBox1.SaveFile( "temp.rtf" );
   stream = new FileStream("temp.rtf", FileMode.Open, FileAccess.Read);
   int size = Convert.ToInt32(stream.Length);
   Byte[] rtf = new Byte[size];
   stream.Read(rtf, 0, size);
   conn = new SqlConnection("Database=Northwind;Integrated Security=true;");
   conn.Open();
   cmd = new SqlCommand("UPDATE Employees SET Photo=@Photo WHERE EmployeeID=1", conn);
   SqlParameter paramRTF =
   new SqlParameter("@Photo",
   SqlDbType.Image,
   rtf.Length,
   ParameterDirection.Input,
   false,
   0,0,null,
   DataRowVersion.Current,
   rtf);
   cmd.Parameters.Add(paramRTF);
  
   int rowsUpdated = Convert.ToInt32(cmd.ExecuteNonQuery());
  
   MessageBox.Show(String.Format("{0} rows updated", rowsUpdated));
   }
   catch(Exception ex)
   {
   MessageBox.Show(ex.Message);
   }
   finally
   {
   if ( stream != null ) stream.Close();
   if (cmd != null ) cmd.Parameters.Clear();
   if (conn != null) conn.Close();
   }
   }
  读取:
  private void btnLoad_Click(object sender, System.EventArgs e)
   {
   richTextBox1.Clear();
   SqlConnection cn = null;
   SqlCommand cmd = null;
   SqlDataReader reader = null;
   try
   {
   cn = new SqlConnection("Database=Northwind;Integrated Security=true;");
   cn.Open();
   cmd = new SqlCommand("SELECT Photo FROM Employees WHERE EmployeeID=1", cn);
   reader = cmd.ExecuteReader();
   reader.Read();
   if (reader.HasRows)
   {
   if (!reader.IsDBNull(0))
   {
   Byte[] rtf = new Byte[Convert.ToInt32((reader.GetBytes(0, 0, null, 0, Int32.MaxValue)))];
   long bytesReceived = reader.GetBytes(0, 0, rtf, 0, rtf.Length);
  
   ASCIIEncoding encoding = new ASCIIEncoding();
   richTextBox1.Rtf = encoding.GetString(rtf, 0, Convert.ToInt32(bytesReceived));
   }
   }
   }
   catch(Exception ex)
   {
   MessageBox.Show(ex.Message);
   }
   finally
   {
   if (reader != null ) reader.Close();
   if (cn != null ) cn.Close();
   }
   }
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