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POPassing an integer variable from C# to Microsoft SQL server and then comparing the retrieved data
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  1. POPassing an integer variable from C# to Microsoft SQL server and then comparing the retrieved data
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    copied!<p>I am trying to develop a CBIR application and thus I am taking an input image, calculating its RGB values in three different variables and modifying the values, then storing them in three variables: <code>r1</code>, <code>g1</code>, <code>b1</code>.</p> <p>Then I am trying to pass these values to database so that I can retrieve images by comparing them using comparison operators, but I am unable to get any data, though I think I am using parameters in a right way.</p> <p>Here is my code:</p> <pre><code>double r1, r2, g1, g2, b1, b2; r1 = aveR -(.1 * aveR); r2 = aveR +(.1 * aveR); g1 = aveG -(.1 * aveG); g2 = aveG +(.1 * aveG); b1 = aveB -(.1 * aveB); b2 = aveB +(.1 * aveB); cn = new SqlConnection(@"Data Source=HOME;Initial Catalog=test_image;Integrated Security=True"); cmd = new SqlCommand("select path from image where red BETWEEN @r1 AND @r2 AND green BETWEEN @g1 AND @g2 AND blue BETWEEN @b1 AND @b2" , cn); cmd.Parameters.AddWithValue("@r1", r1); cmd.Parameters.AddWithValue("@r2", r2); cmd.Parameters.AddWithValue("@g1", g1); cmd.Parameters.AddWithValue("@g2", g2); cmd.Parameters.AddWithValue("@b1", b1); cmd.Parameters.AddWithValue("@b2", b2); cn.Open(); SqlDataReader dr; try { dr = cmd.ExecuteReader(); while (dr.Read()) { progressBar1.Value = progressBar1.Value + 9; listBox1.Items.Add(dr["path"].ToString()); } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { cn.Close(); } /*after this i dont get any data in my list box, where i am expecting the paths of image("path" col in my DB) which should be returned after the comparison query.*/ </code></pre> <p>Here is the code that populates (hope I don't get it wrong, i.e. this code takes the images one by one and then inserts them into the database).</p> <pre><code>int width = 256; int height = 128; int sumr = 0, sumg = 0, sumb = 0; int rank = 0; openFileDialog1.Filter = "All Images|*.jpg; *.bmp; *.png; *.gif"; DialogResult dr = openFileDialog1.ShowDialog(); listBox1.Items.Add("Pixel RED GREEN BLUE "); listBox2.Items.Add("avgR avgG avgB "); if (dr == System.Windows.Forms.DialogResult.OK) { foreach(string file in openFileDialog1.FileNames) { try { Image img = Image.FromFile(file); Image img1 = Resizeimage(img, width, height); pictureBox1.Image = img1; textBox1.Text = file; Bitmap img2 = new Bitmap(img1); Color c; for (int i = 0; i &lt; img2.Width; i++) { for (int j = 0; j &lt; img2.Height; j++) { c = img2.GetPixel(i, j); int r = Convert.ToInt16(c.R); int g = Convert.ToInt16(c.G); int b = Convert.ToInt16(c.B); sumr = sumr + r; sumg = sumg + g; sumb = sumb + b; listBox1.Items.Add(i.ToString() + "," + j.ToString() + " " + r.ToString() + " " + g.ToString() + " " + b.ToString()); } } int total = img2.Height * img2.Width; int aveR = sumr / total; int aveG = sumg / total; int aveB = sumb / total; listBox2.Items.Add(aveR.ToString() + " " + aveG.ToString() + " " + aveB.ToString()); Application.DoEvents(); Thread.Sleep(5000); SqlConnection con = new SqlConnection(@"Data Source=HOME;Initial Catalog=test_image;Integrated Security=True"); MemoryStream ms = new MemoryStream(); pictureBox1.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); byte[] pic_arr = new byte[ms.Length]; ms.Position = 0; ms.Read(pic_arr, 0, pic_arr.Length); SqlCommand cmd = new SqlCommand("insert into image(path,image,red,green,blue,rank)values(@path,@image,@red, @green, @blue, @rank)", con); cmd.Parameters.AddWithValue("@path", textBox1.Text); cmd.Parameters.AddWithValue("@image", pic_arr); cmd.Parameters.AddWithValue("@red", aveR); cmd.Parameters.AddWithValue("@green", aveG); cmd.Parameters.AddWithValue("@blue", aveB); cmd.Parameters.AddWithValue("@rank", rank); con.Open(); try { int rs = cmd.ExecuteNonQuery(); if (rs &gt; 0) { MessageBox.Show("image stored successfully"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { con.Close(); } } catch (Exception ex) { MessageBox.Show("cannot display the image"+ ex.Message); } listBox1.Items.Clear(); listBox2.Items.Clear(); } } } public static Image Resizeimage(Image img, int width, int height) { Image newimg = new Bitmap(width, height); Graphics g = Graphics.FromImage(newimg); g.DrawImage(img, 0, 0, width, height); return newimg; } /** I am sorry if braces make you all little upset, I am new to this site, so editing might be poor**/ </code></pre>
 

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