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C# sql数据库中的映像路径_C#_Asp.net_Sql - Fatal编程技术网

C# sql数据库中的映像路径

C# sql数据库中的映像路径,c#,asp.net,sql,C#,Asp.net,Sql,我正在做一个用户配置文件,首先用户选择图片并用此代码上传到文件夹中,上传后显示图像: protected void btnUpload_Click(object sender, EventArgs e) { // Initialize variables string sSavePath; string sThumbExtension; int intThumbWidth; int intThumbHeight; // Set constant

我正在做一个用户配置文件,首先用户选择图片并用此代码上传到文件夹中,上传后显示图像:

protected void btnUpload_Click(object sender, EventArgs e)
{
    // Initialize variables
    string sSavePath;
    string sThumbExtension;
    int intThumbWidth;
    int intThumbHeight;

    // Set constant values
    sSavePath = "images/";
    sThumbExtension = "_thumb";
    intThumbWidth = 160;
    intThumbHeight = 120;

    // If file field isn’t empty
    if (filUpload.PostedFile != null)
    {
        // Check file size (mustn’t be 0)
        HttpPostedFile myFile = filUpload.PostedFile;
        int nFileLen = myFile.ContentLength;
        if (nFileLen == 0)
        {
            lblOutput.Text = "El archivo no fue cargado.";
            return;
        }

        // Check file extension (must be JPG)
        if (System.IO.Path.GetExtension(myFile.FileName).ToLower() != ".jpg")
        {
            lblOutput.Text = "El archivo debe tener una extensión JPG";
            return;
        }

        // Read file into a data stream
        byte[] myData = new Byte[nFileLen];
        myFile.InputStream.Read(myData, 0, nFileLen);

        // Make sure a duplicate file doesn’t exist.  If it does, keep on appending an 
        // incremental numeric until it is unique
        string sFilename = System.IO.Path.GetFileName(myFile.FileName);
        int file_append = 0;
        while (System.IO.File.Exists(Server.MapPath(sSavePath + sFilename)))
        {
            file_append++;
            sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
                             + file_append.ToString() + ".jpg";
        }

        // Save the stream to disk
        System.IO.FileStream newFile
                = new System.IO.FileStream(Server.MapPath(sSavePath + sFilename),
                                           System.IO.FileMode.Create);
        newFile.Write(myData, 0, myData.Length);
        newFile.Close();

        // Check whether the file is really a JPEG by opening it
        System.Drawing.Image.GetThumbnailImageAbort myCallBack =
                       new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
        Bitmap myBitmap;
        try
        {
            myBitmap = new Bitmap(Server.MapPath(sSavePath + sFilename));

            // If jpg file is a jpeg, create a thumbnail filename that is unique.
            file_append = 0;
            string sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
                                                     + sThumbExtension + ".jpg";
            while (System.IO.File.Exists(Server.MapPath(sSavePath + sThumbFile)))
            {
                file_append++;
                sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) +
                               file_append.ToString() + sThumbExtension + ".jpg";
            }

            // Save thumbnail and output it onto the webpage
            System.Drawing.Image myThumbnail
                    = myBitmap.GetThumbnailImage(intThumbWidth,
                                                 intThumbHeight, myCallBack, IntPtr.Zero);
            myThumbnail.Save(Server.MapPath(sSavePath + sThumbFile));
            imgPicture.ImageUrl = sSavePath + sThumbFile;


            // Displaying success information
            lblOutput.Text = "El archivo fue cargado con exito!";

            // Destroy objects
            myThumbnail.Dispose();
            myBitmap.Dispose();
        }
        catch (ArgumentException errArgument)
        {
            // The file wasn't a valid jpg file
            lblOutput.Text = "No es un archivo .jpg valido";
            System.IO.File.Delete(Server.MapPath(sSavePath + sFilename));
        }
    }
}
在用户完成配置文件的其他字段(姓名、电子邮件等)后,会出现一个保存按钮,并使用此按钮保存到数据库中:

这是前面的密码

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:pruebaConnectionString %>"
    InsertCommand="INSERT INTO Curriculum(Nombre, Correo) VALUES (@TextBox1, @TextBox2)">
    <InsertParameters>
        <asp:ControlParameter ControlID="TextBox1" DefaultValue="" Name="TextBox1" PropertyName="Text" />
        <asp:ControlParameter ControlID="TextBox2" DefaultValue="" Name="TextBox2" PropertyName="Text" />                     
    </InsertParameters>
</asp:SqlDataSource>
现在我要做的是,当用户单击save按钮(或者方法按钮上的内容)时,图像url被保存到Imagen字段上的数据库中,Imagen字段是一个varchar 50,但不起作用,我得到:无法将值NULL插入到'Nombre'列中,表'prueba.dbo.currency';列不允许空值。插入失败。 声明已终止

但是如果我只使用SqlDataSource1.Insert()保留button1\u-click方法;这些字段将保存到数据库中

知道如何将图像url保存到数据库中吗?希望我的解释清楚


谢谢D

您是在尝试创建新记录(您需要在其中指定所有值)还是尝试更新记录

目前,您的代码正在尝试执行插入操作,这将在课程表中创建一条新记录,但您只设置了1值。也许你想做一个更新

string strQuery = "UPDATE curriculum SET imagen = @imgPicture WHERE Nombre = ???";

你完全正确!!这是更新!!但是nombre?现在起作用的是什么呢?我写了这个字符串strQuery=“UPDATE-courseum-SET-imagen=@imgPicture”;但是更新了所有的记录,不仅仅是我插入的记录你需要替换吗???使用刚才插入的nombre值,可能是TextBox1.Text?
string strQuery = "UPDATE curriculum SET imagen = @imgPicture WHERE Nombre = ???";