如何在MySQL数据库中插入图像并使用vb.net进行检索？

I am using the longblob data type to insert image but it gives error.

我使用longblob数据类型来插入图像,但它给出了错误。

I want to insert image from picture box to mysql database.

我想从图片框插入图像到mysql数据库。

1 个解决方案

#1

I have here a c# implementation but you can use a c# to VB.Net converter

我这里有一个c#实现,但你可以使用c#到VB.Net转换器

In the aspx file:

在aspx文件中:

<asp:FileUpload runat="server" ID="fuPersonPicture" />
<asp:Button runat="server" ID="btnPhotoUpload" Text="Upload" OnClick="btnPhotoUpload_Click" />

In code-behind:

protected void btnPhotoUpload_Click(object sender, EventArgs e)
{
    byte[] rawData = new byte[fuPersonPicture.FileBytes.Length];
    int fileSize = fuPersonPicture.FileBytes.Length;
    fuPersonPicture.FileContent.Read(rawData, 0, fileSize);

    string extension = Path.GetExtension(fuPersonPicture.PostedFile.FileName);
    switch (extension.ToLower())
    {
        // Only allow uploads that look like images.
        case ".jpg":
        case ".jpeg":
        case ".gif":
        case ".png":
        case ".bmp":
            System.Drawing.Image myImage = System.Drawing.Image.FromStream(fuPersonPicture.PostedFile.InputStream);

            fuPersonPicture.FileContent.Close();

            PersonPictureManager.Insert(fuPersonPicture.FileName, fileSize, rawData, myImage.Height, myImage.Width);

            //lbUploadMessage.Text = string.Empty;
            break;

        default:
            //lbUploadMessage.Text = "<br>File is not a valid image file (JPG, JPEG, GIF, BMP, PNG).";
            break;
    }
    fuPersonPicture.FileContent.Close();
}

Definition of PersonPictureManager.Insert()

PersonPictureManager.Insert()的定义

public static void Insert(string FileName, int FileSize, byte[] RawData, int ImageHeight, int ImageWidth)
{
        string strSQL = "insert into person_picture (file_id, file_name, file_size, file, width, height) values (NULL, @file_name, @file_size, ?file, @width, @height)";
        using (MySqlCommand cmd = new MySqlCommand(strSQL))
        {
            cmd.Parameters.Add(new MySqlParameter("@file_name", FileName));
            cmd.Parameters.Add(new MySqlParameter("@file_size", FileSize));
            cmd.Parameters.Add(new MySqlParameter("@height", ImageHeight));
            cmd.Parameters.Add(new MySqlParameter("@width", ImageWidth));
            cmd.Parameters.Add(new MySqlParameter("?file", RawData));
            DatabaseConnection.ExecuteNonQuery(cmd); // Just a DB helper class
        }
}

#1