将PictureBox图像插入Sql Server数据库
我试图从图片picturebox插入一些图像：
MemoryStream ms = new MemoryStream(); pictureBox1.Image.Save(ms, ImageFormat.Jpeg); byte[] photo = new byte[ms.Length]; ms.Position = 0; ms.Read(photo, 0, photo.Length); command.CommandText = "INSERT INTO ImagesTable (Image) VALUES('" + photo + "')"; command.CommandType = CommandType.Text; command.ExecuteNonQuery();
我在数据库中得到以下结果：
ID Image 6 0x53797374656D2E427974655B5D
但是当我使用SQL script插入一些图像时：
insert into ImagesTable (Image) SELECT BulkColumn FROM Openrowset( Bulk 'C:\pinguins.jpg', Single_Blob) as img
然后插入的数据如下所示：
ID Image 4 0xFFD8FFE000104A464946000102010[.....]
这里二进制数据要长得多。
当我从数据库中将此图像检索回到图片picturebox ，它会正确显示：
command.CommandText = "SELECT Image FROM ImagesTable where ID = 4"; byte[] image = (byte[])command.ExecuteScalar(); MemoryStream ms1 = new MemoryStream(image); pictureBox2.Image = Bitmap.FromStream(ms1);
但是在检索ID = 6 （从pictureBox加载）的图像时出错。
ArgumentException: Parameter is not valid.
我究竟做错了什么？
我很感激任何建议。
这样写：]
Image img = Image.FromFile(@"C:\Lenna.jpg"); byte[] arr; using (MemoryStream ms = new MemoryStream()) { img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); arr = ms.ToArray(); }
要么
Image img = picturebox1.Image(); byte[] arr; ImageConverter converter = new ImageConverter(); arr=(byte[])converter.ConvertTo(img, typeof(byte[])); command.CommandText = "INSERT INTO ImagesTable (Image) VALUES('" + arr + "')"; command.CommandType = CommandType.Text; command.ExecuteNonQuery();
using System; using System.Windows.Forms; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Drawing.Imaging; using System.IO; using Microsoft.VisualBasic; namespace inserting_imgs { public partial class Form1 : Form { public Form1() { InitializeComponent(); } SqlConnection con; SqlCommand cmd; SqlDataAdapter adapter; DataSet ds; int rno = 0; MemoryStream ms; byte[] photo_aray; private void Form1_Load(object sender, EventArgs e) { con = new SqlConnection("user id=sa;password=123;database=adil"); loaddata(); showdata(); } void loaddata() { adapter = new SqlDataAdapter("select sno,sname,course,fee,photo from student", con); adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey; ds = new DataSet(); adapter.Fill(ds, "student"); } void showdata() { if (ds.Tables[0].Rows.Count > 0) { textBox1.Text = ds.Tables[0].Rows[rno][0].ToString(); textBox2.Text = ds.Tables[0].Rows[rno][1].ToString(); textBox3.Text = ds.Tables[0].Rows[rno][2].ToString(); textBox4.Text = ds.Tables[0].Rows[rno][3].ToString(); pictureBox1.Image = null; if (ds.Tables[0].Rows[rno][4] != System.DBNull.Value) { photo_aray = (byte[])ds.Tables[0].Rows[rno][4]; MemoryStream ms = new MemoryStream(photo_aray); pictureBox1.Image = Image.FromStream(ms); } } else MessageBox.Show("No Records"); } private void browse_Click(object sender, EventArgs e) { openFileDialog1.Filter = "jpeg|*.jpg|bmp|*.bmp|all files|*.*"; DialogResult res = openFileDialog1.ShowDialog(); if (res == DialogResult.OK) { pictureBox1.Image = Image.FromFile(openFileDialog1.FileName); } } private void newbtn_Click(object sender, EventArgs e) { cmd = new SqlCommand("select max(sno)+10 from student", con); con.Open(); textBox1.Text = cmd.ExecuteScalar().ToString(); con.Close(); textBox2.Text = textBox3.Text = textBox4.Text = ""; pictureBox1.Image = null; } private void insert_Click(object sender, EventArgs e) { cmd = new SqlCommand("insert into student(sno,sname,course,fee,photo) values(" + textBox1.Text + ",'" + textBox2.TabIndex + "','" + textBox3.Text + "'," + textBox4.Text + ",@photo)", con); conv_photo(); con.Open(); int n = cmd.ExecuteNonQuery(); con.Close(); if (n > 0) { MessageBox.Show("record inserted"); loaddata(); } else MessageBox.Show("insertion failed"); } void conv_photo() { //converting photo to binary data if (pictureBox1.Image != null) { //using FileStream:(will not work while updating, if image is not changed) //FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read); //byte[] photo_aray = new byte[fs.Length]; //fs.Read(photo_aray, 0, photo_aray.Length); //using MemoryStream: ms = new MemoryStream(); pictureBox1.Image.Save(ms, ImageFormat.Jpeg); byte[] photo_aray = new byte[ms.Length]; ms.Position = 0; ms.Read(photo_aray, 0, photo_aray.Length); cmd.Parameters.AddWithValue("@photo", photo_aray); } } private void search_Click(object sender, EventArgs e) { try { int n = Convert.ToInt32(Interaction.InputBox("Enter sno:", "Search", "20", 100, 100)); DataRow drow; drow = ds.Tables[0].Rows.Find(n); if (drow != null) { rno = ds.Tables[0].Rows.IndexOf(drow); textBox1.Text = drow[0].ToString(); textBox2.Text = drow[1].ToString(); textBox3.Text = drow[2].ToString(); textBox4.Text = drow[3].ToString(); pictureBox1.Image = null; if (drow[4] != System.DBNull.Value) { photo_aray = (byte[])drow[4]; MemoryStream ms = new MemoryStream(photo_aray); pictureBox1.Image = Image.FromStream(ms); } } else MessageBox.Show("Record Not Found"); } catch { MessageBox.Show("Invalid Input"); } } private void update_Click(object sender, EventArgs e) { cmd = new SqlCommand("update student set sname='" + textBox2.Text + "', course='" + textBox3.Text + "', fee='" + textBox4.Text + "', photo=@photo where sno=" + textBox1.Text, con); conv_photo(); con.Open(); int n = cmd.ExecuteNonQuery(); con.Close(); if (n > 0) { MessageBox.Show("Record Updated"); loaddata(); } else MessageBox.Show("Updation Failed"); } private void delete_Click(object sender, EventArgs e) { cmd = new SqlCommand("delete from student where sno=" + textBox1.Text, con); con.Open(); int n = cmd.ExecuteNonQuery(); con.Close(); if (n > 0) { MessageBox.Show("Record Deleted"); loaddata(); rno = 0; showdata(); } else MessageBox.Show("Deletion Failed"); } private void first_Click(object sender, EventArgs e) { rno = 0; showdata(); MessageBox.Show("First record"); } private void previous_Click(object sender, EventArgs e) { if (rno > 0) { rno--; showdata(); } else MessageBox.Show("First record"); } private void next_Click(object sender, EventArgs e) { if (rno < ds.Tables[0].Rows.Count - 1) { rno++; showdata(); } else MessageBox.Show("Last record"); } private void last_Click(object sender, EventArgs e) { rno = ds.Tables[0].Rows.Count - 1; showdata(); MessageBox.Show("Last record"); } private void exit_Click(object sender, EventArgs e) { this.Close(); } }
}