Question

我所拥有的是一个页面，用于上传图像并将其路径保存到具有图像优先级的数据库中。现在这只是一个例子，我在我的数据库中有5个图像，其优先级如

ID  ImageName  Description  Path  Priority
 1    1.jpg      Hello      xxxx   1
 2    2.jpg       hi        xxxx   2
 3    3.jpg       how       xxxx   3
 4    4.jpg       good      xxxx   4
 5    5.jpg       bye       xxxx   5

在我的页面中，我有File-Uploader控件上传文件和下拉列表，优先级来自数据库。

现在我的问题是当我浏览图片上传并从下拉列表中选择优先级时图像应放在该图像的优先级和优先级增加1，依此类推

如果我想上传图片编号6并以3优先级存储它，那么数据库应该是这样的

ID  ImageName  Description  Path  Priority
 1    1.jpg      Hello      xxxx   1
 2    2.jpg       hi        xxxx   2
 6    6.jpg       you       xxxx   3
 3    3.jpg       how       xxxx   4
 4    4.jpg       good      xxxx   5
 5    5.jpg       bye       xxxx   6

这是我上传image.aspx.cs文件的代码

protected void Page_Load(object sender, EventArgs e)
{
    AutoNumber(); 
}
public void AutoNumber()
{     
    con.Open();
    SqlCommand cmd = new SqlCommand("SELECT COUNT(Priority) as Tot FROM TestImages", con);
    SqlDataReader dr;

    dr = cmd.ExecuteReader();
    while (dr.Read())
    {
        int i = Convert.ToInt32(dr["tot"]);

        if (i > 0)
        {
            int j = i + 1;
            lblPriority.Text = "0" + j.ToString();

        }
        else
        {
            lblPriority.Text = "1";
        }

    }
    con.Close();
}
protected void btnSubmit_Click1(object sender, EventArgs e)
{
    con.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["WebGallery"].ConnectionString;
    string Priority = lblPriority.Text.Trim();
    //Get Filename from fileupload control
    string imgName = fileuploadimages.FileName.ToString();
    //sets the image path
    string imgPath = "Images/"+""+ddlDepartment.SelectedValue+"/";
    bool IsExists = System.IO.Directory.Exists(Server.MapPath(imgPath));
    if (!IsExists)
        System.IO.Directory.CreateDirectory(Server.MapPath(imgPath));        
    //then save it to the Folder
    fileuploadimages.SaveAs(Server.MapPath(imgPath+imgName));
    //Open the database connection
    con.Open();
    //Query to insert images name and Description into database
    SqlCommand cmd = new SqlCommand("Insert into TestImages(ImageName,Description,Path,Priority) values(@ImageName,@Description,@Path,@Priority)" + "Update TestImages set Priority=Priority+1 where Priority='" + ddlPriority.SelectedValue + "'", con);
    //Passing parameters to query
    cmd.Parameters.AddWithValue("@ImageName", imgName);
    cmd.Parameters.AddWithValue("@Description", tbImageName.Text);
    cmd.Parameters.AddWithValue("@Path", imgPath + imgName);
    cmd.Parameters.AddWithValue("@Priority", lblPriority.Text);
    cmd.ExecuteNonQuery();
    //Close dbconnection
    con.Close();
    tbImageName.Text = string.Empty;     
}   
}

它没有更新和插入错误，但它不会从最后添加的下拉列表中以所选优先级插入并更新优先级。

如何从所选优先级中放置图像提前致谢

Answer 1

您必须更新数据库中的每一行。尝试这样的事情：

Image newImage;        //Your image uploaded
List<Image> listImages; //All the images from your DB (before insertion)

foreach(Image img in listImages) {
   if(img['Priority'] < newImg['Priority']) 
   {
      SqlCommand cmd = new SqlCommand(
                  "UPDATE TestImage SET Priority=" + img['Priority'] - 1 + ";"); 
   }
   else
   {
      SqlCommand cmd = new SqlCommand(
                  "UPDATE TestImage SET Priority=" + img['Priority'] + 1 + ";"); 

   }

}

Answer 2

最后我得到了答案

 protected void ChangePriority_Click(object sender, EventArgs e)
{
    //con.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["WebGallery"].ConnectionString;
    string DepartmentID = ddlDepartment.SelectedValue;
    string Description = tbImageName.Text.Trim();
    //string Priority = lblPriority.Text.Trim();
    string Priority = ddlPriority.SelectedValue;
    //Get Filename from fileupload control
    string imgName = fileuploadimages.FileName.ToString();
    //sets the image path if exist then store image in that place else create one
    string imgPath = "Images/Departments/" + "" + ddlDepartment.SelectedValue + "/";
    bool IsExists = System.IO.Directory.Exists(Server.MapPath(imgPath));
    if (!IsExists)
        System.IO.Directory.CreateDirectory(Server.MapPath(imgPath));
    //then save it to the Folder
    fileuploadimages.SaveAs(Server.MapPath(imgPath + imgName));
    //Open the database connection
    con.Open();
    //Query to insert * into images into database

    SqlCommand cmd = new SqlCommand("Update Images set Priority=Priority+1 where Priority>='" + ddlPriority.SelectedValue + "'" + "Insert into Images(ImageName,Description,Path,Priority,DepartmentID) values(@ImageName,@Description,@Path,@Priority,@DepartmentID)", con);
    //Passing parameters to query
    cmd.Parameters.AddWithValue("@ImageName", imgName);
    cmd.Parameters.AddWithValue("@Description", Description);
    cmd.Parameters.AddWithValue("@Path", imgPath + imgName);
    cmd.Parameters.AddWithValue("@Priority", Priority);
    cmd.Parameters.AddWithValue("@DepartmentID", DepartmentID);
    cmd.ExecuteNonQuery();
    //Close dbconnection
    con.Close();
    tbImageName.Text = string.Empty;
   // Response.Redirect(Request.RawUrl);
}

如何将图像放入选定位置并存储在数据库中

2 个答案: