Question

我试图在picturebox中插入一些图像：

  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picturebox时，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);

但是在使用ID = 6检索图像时出错（从pictureBox加载）。

ArgumentException: Parameter is not valid.

我做错了什么？

我很感激任何建议。

Answer 1

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();
}

或

 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();

Answer 2

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();
    }
 }

}

将PictureBox图像插入Sql Server数据库

2 个答案: