Database
1.Create a database named
TestImage
2.create a table called test_table holding two columns
id_image(datatype: nvarchar[50]) and
pic(datatype: image).
Front End
1.create a new project in visual studio
2.select
windows application, language
c# and name it as
TestImage
3. drop two labels, a
textbox, a combo box, three buttons and two picture boxes on your win form as shown below
4.
The first picture box will only displays the image you are going to save in your database providing some id in the textbox (I used this to just recall the image from database) once an image is loaded on the clicking event of Store button we are going to insert that image with provided ID into the database and the combo box will load itself with all available IDs in our database. By selecting an id we and clicking Retrieve the respective image will be shown in the second picture box.
5.double click the button.It will create a button click event.
Here declare a global string
a data adapter
and a dataset
you will also require to use System.IO and System.Data.SqlClient
using System.IO;
using System.Data.SqlClient;
now we need to create a method to insert our image into the database and second method to retrieve all images. I named the method inserting my image into the database as
update() and to retrieve my images I named my method as
connection(). Now update() uses filestream to convert the image into binary data since image datatype in
SQL Server 2005 use to store binary data in its image datatype. While connection() simply convert that binary data to an image using identical technique for us. Code for both the methods is:
private void updatedata()
{
//use filestream object to read the image.
//read to the full length of image to a byte array.
//add this byte as an oracle parameter and insert it into database.
try
{
//proceed only when the image has a valid path
if (imagename != "")
{
FileStream fs;
fs = new FileStream(@imagename, FileMode.Open, FileAccess.Read);
//a byte array to read the image
byte[] picbyte = new byte[fs.Length];
fs.Read(picbyte, 0, System.Convert.ToInt32(fs.Length));
fs.Close();
//open the database using odp.net and insert the data
string connstr = @"Data Source=.;Initial Catalog=TestImage;
Persist Security Info=True;User ID=sa";
SqlConnection conn = new SqlConnection(connstr);
conn.Open();
string query;
query = "insert into test_table(id_image,pic) values(" + textBox1.Text + "," + " @pic)";
SqlParameter picparameter = new SqlParameter();
picparameter.SqlDbType = SqlDbType.Image;
picparameter.ParameterName = "pic";
picparameter.Value = picbyte;
SqlCommand cmd = new SqlCommand(query, conn);
cmd.Parameters.Add(picparameter);
cmd.ExecuteNonQuery();
MessageBox.Show("Image Added");
cmd.Dispose();
conn.Close();
conn.Dispose();
Connection();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
//----------------------------------------
private void Connection()
{
//connect to the database and table
//selecting all the columns
//adding the name column alone to the combobox
try
{
string connstr = @"Data Source=.;Initial Catalog=TestImage;
Persist Security Info=True;User ID=sa";
SqlConnection conn = new SqlConnection(connstr);
conn.Open();
empadap1 = new SqlDataAdapter();
empadap1.SelectCommand = new SqlCommand("SELECT * FROM test_table"
, conn);
dset = new DataSet("dset");
empadap1.Fill(dset);
DataTable dtable;
dtable = dset.Tables[0];
comboBox1.Items.Clear();
foreach (DataRow drow in dtable.Rows)
{
comboBox1.Items.Add(drow[0].ToString());
comboBox1.SelectedIndex = 0;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
now double click the Load button and write the
code lines:
try
{
FileDialog fldlg = new OpenFileDialog();
//specify your own initial directory
fldlg.InitialDirectory = @":D\";
//this will allow only those file extensions to be added
fldlg.Filter = "Image File (*.jpg;*.bmp;*.gif)|*.jpg;*.bmp;*.gif";
if (fldlg.ShowDialog() == DialogResult.OK)
{
imagename = fldlg.FileName;
Bitmap newimg = new Bitmap(imagename);
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
pictureBox1.Image = (Image)newimg;
}
fldlg = null;
}
catch (System.ArgumentException ae)
{
imagename = " ";
MessageBox.Show(ae.Message.ToString());
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
Now double click Store button and call the update () method to insert selected image into the database.
the update method itself calls connection() therefore combo box will be filled with IDs of images exits in database, one can use the connection method in anyway the person likes.
Finally double click Retrieve button and write
DataTable dataTable = dset.Tables[0];
//if there is an already an image in picturebox, then delete it
if (pictureBox2.Image != null)
{
pictureBox2.Image.Dispose();
}
//using filestream object write the column as bytes and store
it as an image
FileStream FS1 = new FileStream("image.jpg", FileMode.Create);
foreach (DataRow dataRow in dataTable.Rows)
{
if (dataRow[0].ToString() == comboBox1.SelectedItem.ToString())
{
byte[] blob = (byte[])dataRow[1];
FS1.Write(blob, 0, blob.Length);
FS1.Close();
FS1 = null;
pictureBox2.Image = Image.FromFile("image.jpg");
pictureBox2.SizeMode = PictureBoxSizeMode.StretchImage;
pictureBox2.Refresh();
}
}
