如何使用C＃从MySQL获取图像文件路径

Question

I am retrieving the image and other information to to users with the following code. I would like to also get the image file path display in a textbox below the image. I have been trying to do that without success.

The following is the code which I have written, I have other matters work out except getting the image location from mysql display.

Please anyone help me with his!

private void showData_Click(object sender, EventArgs e)
            {
                string myConnection = "datasource = localhost; port=3306; username=root; password=root";
                string Query = "select * from MawkMo.Enlist_info;";
                MySqlConnection sqlConnection = new MySqlConnection(myConnection);
                MySqlCommand sqlCommand = new MySqlCommand(Query, sqlConnection);
                MySqlDataReader myReader;
                try
                {
                    sqlConnection.Open();
                    myReader = sqlCommand.ExecuteReader();
                    while (myReader.Read())
                    {

    byte[] imgbyte = (byte[])(myReader["Photo"]);
                            if (imgbyte == null)
                            {
                                PhotoBox.Image = null;
                            }
                            else
                            {
                                //string imgPath = (string)sqlCommand.ExecuteScalar();
                                //Photo_path.Text = imgPath;
                                MemoryStream mryStream = new MemoryStream(imgbyte);
                                PhotoBox.Image = System.Drawing.Image.FromStream(mryStream);
                            }

                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }

Answer 1

In the code's current form, you cannot retrieve an image file path because you aren't actually storing the image as a file, you are storing it as a series of bytes in the database. You won't find image files on the server's hard drive anywhere, and the images won't be retrievable outside your application.

If having access to the images independent of your application is a concern, or if you don't want the image stored in the database (performance concerns) then you would need to re-design the database. In your database saves you would issue the Image.Save() method to save the file to a specific location, and then store that string (ImageLocation) into the database rather than storing the image itself as a byte array. The retrieval process is then simply to retrieve the ImageLocation String and use it in the Image.FromFile() method.

Answer 2

What is a PhotoBox.Image is?

MemoryStream imagebuf=new MemoryStream((byte[])myReader["Photo"]);

//create image object
System.Drawing.Image outImage=System.Drawing.Image.FromStream(imagebuf,true);
outImage.Save(Server.MapPath(“PhotoTemp/”)+”2.gif”);