查詢表達式中的語法錯誤（缺少運算符）'pProductId ='

Question

嗨我試圖檢索包含ie的pProductImage。 〜/ Images/pic1.jpg（圖片網址），並使用pProductId作爲標識符根據ID顯示不同的圖像。

這是我cataglogue.aspx.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Configuration; 
using System.Data.OleDb; 


public partial class Catalogue : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
     string ImageId = Request.QueryString["Img"]; 

     string sqlText = "SELECT pProductImage FROM Products WHERE pProductId = " +ImageId; 

     OleDbConnection mDB = new OleDbConnection(ConfigurationManager.ConnectionStrings["AccessConnection"].ConnectionString); 
     OleDbCommand cmd = new OleDbCommand(sqlText, mDB); 

     mDB.Open(); 
     OleDbDataReader rdr = cmd.ExecuteReader(); 
     if (rdr.Read()) 
     { 
      Response.BinaryWrite((byte[])rdr["pProductImage"]); 
     } 
     mDB.Close(); 

    } 
} 

在我cataglogue.aspx（在圖像控件來顯示圖像）

<div> 

    <img src="Catalogue.aspx?pProductId=2" alt="" /> 
    </div> 

Answer 1

如果要存儲的圖片網址你數據庫表，那麼你需要把它作爲一個字符串數據 - 例如

代碼隱藏：

protected string GetProductImgUrl(int productId) 
{ 
    var sqlText = "SELECT pProductImage FROM Products WHERE pProductId = " + productId.ToString(); 
    using(var mDB = new OleDbConnection(ConfigurationManager.ConnectionStrings["AccessConnection"].ConnectionString)) 
    { 
     mDB.Open(); 
     var cmd = new OleDbCommand(sqlText, mDB); 
     using (var rdr = cmd.ExecuteReader()) 
     { 
      if (rdr.Read()) 
      { 
      return ResolveUrl((rdr["pProductImage"]).ToString()); 
      } 
     } 
    } 
    return ResolveUrl("~/images/NotAvailable.png");  // Not available image 
} 

而在加價

<div> 
    <img src='<%= GetProductImgUrl(2) %>' alt="" /> 
</div>