jquery - 如何使用 json 从 sql server ASP.net 中检索数据

Question

我正在尝试使用带有 C# 和 jquery mobile 的 asp.net 3.5 中的 web 服务从数据库中填充列表。

当我运行该站点时它工作正常，但是当我将它发布到我的服务器时它不会填充列表并且 ajax 错误函数会捕获一个错误。这是我的代码。

我的网络服务：

public class product
{
    //[product] ,[img1] ,[descr]
    public string name;
    public string img1;
    public string descr;

}

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
 [System.Web.Script.Services.ScriptService]
public class CarService : System.Web.Services.WebService {


[WebMethod]
    public List<product> GetAllProducts()
    {
        List<product> productt = new List<product> {};

        string query = "SELECT [product] ,[img1] ,[descr] FROM [ELQ].[dbo].[products]";
        SqlCommand cmd = new SqlCommand(query);
        DataSet ds = GetData(cmd);
        DataTable dt = ds.Tables[0];

        // Process each employee record in table...
        //foreach (DataRow dr in dt.Rows)
        foreach(DataRow item in ds.Tables[0].Rows)
        {
            //productt.Add((DataRow) row);
            product pro = new product();
            pro.name = item["product"].ToString();
            pro.img1 = item["img1"].ToString();
            pro.descr = item["descr"].ToString();
            productt.Add(pro);
        }

        return productt; 
    }
    public static string GetShipDetails()
    {

        string query = "SELECT [product] ,[img1] ,[descr] FROM [ELQ].[dbo].[products]";
        SqlCommand cmd = new SqlCommand(query);
        return GetData(cmd).GetXml();
    }
    private static DataSet GetData(SqlCommand cmd)
    {
        string connString = "Data Source=GHOST-PC\\STC;Initial Catalog=ELQ;Integrated Security=True";
        using (SqlConnection con = new SqlConnection(connString))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    sda.Fill(ds);
                    return ds;
                }
            }
        }
    }


}

剧本：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<head runat="server">
    <title>jQuery Mobile Market</title>
    <link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.0/jquery.mobile-1.3.0.min.css" />
    <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
    <script src="http://code.jquery.com/mobile/1.3.0/jquery.mobile-1.3.0.min.js"></script>
    <script type="text/javascript">

            $(document).on('pageinit', function () {
                Greating();

            });

            function Greating() {

                $.ajax({

                    type: "POST",
                    url: "CarService.asmx/GetAllProducts",
                    data: "{}",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (response) {

                        var productt = response.d;
                        $.each(productt, function (index, product) {

                            $("#theList").append("<li><img src='pic/" + product.img1 + "'> <br /> " + product.name + " <br />" + product.descr + "</li>");
                        });

                        $("#theList").listview("refresh");
                    },

                    error: function (response) {
                        $("#theList").append("<li>error<li>");
                    }
                });
            }
        </script>

它看起来像 json 响应是错误的并产生错误，但是当我从笔记本电脑执行代码时它工作正常。我不知道我错过了什么，所以请帮助我。

错误：

POST http://192.168.1.7:7777/CarService.asmx/GetAllProducts 500 (Internal Server Error) jquery-1.8.2.min.js:2
send jquery-1.8.2.min.js:2
p.extend.ajax jquery-1.8.2.min.js:2
Greating 192.168.1.7:18
(anonymous function) 192.168.1.7:12
p.event.dispatch jquery-1.8.2.min.js:2
g.handle.h jquery-1.8.2.min.js:2
p.event.trigger jquery-1.8.2.min.js:2
(anonymous function) jquery-1.8.2.min.js:2
p.extend.each jquery-1.8.2.min.js:2
p.fn.p.each jquery-1.8.2.min.js:2
p.fn.extend.trigger jquery-1.8.2.min.js:2
a.Widget._trigger jquery.mobile-1.3.0.min.js:2
a.widget._createWidget jquery.mobile-1.3.0.min.js:2
(anonymous function) jquery.mobile-1.3.0.min.js:2
a.(anonymous function).(anonymous function) jquery.mobile-1.3.0.min.js:2
(anonymous function) jquery.mobile-1.3.0.min.js:2
p.extend.each jquery-1.8.2.min.js:2
p.fn.p.each jquery-1.8.2.min.js:2
a.fn.(anonymous function) jquery.mobile-1.3.0.min.js:2
C jquery.mobile-1.3.0.min.js:2
a.mobile.loadPage jquery.mobile-1.3.0.min.js:2
a.mobile.changePage jquery.mobile-1.3.0.min.js:2
a.mobile._handleHashChange jquery.mobile-1.3.0.min.js:2
(anonymous function) jquery.mobile-1.3.0.min.js:2
p.event.dispatch jquery-1.8.2.min.js:2
g.handle.h jquery-1.8.2.min.js:2
p.event.trigger jquery-1.8.2.min.js:2
(anonymous function) jquery-1.8.2.min.js:2
p.extend.each jquery-1.8.2.min.js:2
p.fn.p.each jquery-1.8.2.min.js:2
p.fn.extend.trigger jquery-1.8.2.min.js:2
(anonymous function) jquery.mobile-1.3.0.min.js:2

score 4 · Accepted Answer

我修复了错误，实际上这不是错误我在我的数据库中有登录和身份验证问题所以我决定为像我这样的初学者发布代码所以这是我的代码

首先我建立了一个服务来处理我的数据库，我使用了一种简单的方法来做到这一点

这是我的 CarService 课程

using System;
using System.Collections.Generic;
//using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data.SqlClient;
//using System.Web.Script.Serialization;
using System.Web.Script.Services;
using System.IO;
//using Newtonsoft.Json;
using System.Data;
using System.Text;



/// <summary>
/// Summary description for CarService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
 [System.Web.Script.Services.ScriptService]
public class CarService : System.Web.Services.WebService {

    public class product
    {
        public string name;
        public string img1;
        public string descr;

    }

    static List<product> productt = new List<product> { };

    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    [WebMethod]
    public List<product> GetAllProducts()
    {

        string query = "SELECT  [product] ,[img1] ,[descr] FROM [ELQ].[dbo].[products]";
        SqlCommand cmd = new SqlCommand(query);
        DataSet ds = GetData(cmd);
        DataTable dt = ds.Tables[0];
        foreach(DataRow item in ds.Tables[0].Rows)
        {
            product pro = new product();
            pro.name = item["product"].ToString();
            pro.img1 = item["img1"].ToString();
            pro.descr = item["descr"].ToString();
            productt.Add(pro);
        }

        return productt; 
    }

    private static DataSet GetData(SqlCommand cmd)
    {
        string connString = "Data Source=GHOST-PC\\STC;Initial Catalog=ELQ;Persist Security Info=True;User ID=sa;Password=seif@ghost";
        string str = "Data Source=GHOST-PC\\STC;Initial Catalog=ELQ;Persist Security Info=True;User ID=sa;Password=seif@ghost";
        using (SqlConnection con = new SqlConnection(str))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    sda.Fill(ds);
                    return ds;
                }
            }
        }
    }


}

然后这是我的包

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head runat="server">
    <title>jQuery Mobile Market</title>
    <link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.0/jquery.mobile-1.3.0.min.css" />
    <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
    <script src="http://code.jquery.com/mobile/1.3.0/jquery.mobile-1.3.0.min.js"></script>
    <script type="text/javascript" type="text/javascript">


        $(document).ready(function () {

            $("#theList").removeData();
            Greating();
        });

        function Greating() {

            $.ajax({

                type: "POST",
                url: "CarService.asmx/GetAllProducts",
                data: "{}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {

                    var productt = response.d;
                    $.each(productt, function (index, product) {

                        $("#theList").append("<li><img src='pic/" + product.img1 + "'> <br /> " + product.name + " <br />" + product.descr + "</li>");
                    });

                    console.log(response);
                },

                error: function (response) {
                    $("#theList").append("<li>error<li>");

                    console.log(response);
                }
            });
        }
    </script>
</head>
<body>
    <div data-role="page" id="homePage">
        <div data-role="header">
            <div data-role="navbar">
                <ul>
                    <li><a href="#homePage" class="ui-btnactive">Home</a></li>
                    <li><a href="#aboutPage">7arag</a></li>
                    <li><a href="#market">Market</a></li>
                    <li><a href="#settings">Settings</a></li>
                </ul>
            </div>
        </div>
        <div data-role="content">
            <form action="echo.cfm" method="post">
            <div data-role="fieldcontain">
                <label for="name">
                    Name:</label>
                <input type="text" name="name" id="name" value="" />
            </div>
            <div data-role="fieldcontain">
                <label for="email">
                    Email:</label>
                <input type="text" name="email" id="email" value="" />
            </div>
            <div data-role="fieldcontain">
                <input type="submit" name="submit" value="Send" />
            </div>
            </form>
        </div>
        <div data-role="footer" data-position="fixed" dataid="footernav">
            <p>
                asd</p>
        </div>
    </div>
    <div data-role="page" id="market">
        <div data-role="navbar">
            <ul>
                <li><a href="#homePage" class="ui-btnactive">Home</a></li>
                <li><a href="#aboutPage">7arag</a></li>
                <li><a href="#market">Market</a></li>
                <li><a href="#settings">Settings</a></li>
            </ul>
        </div>
        <div data-role="content">
            <ul id="theList" data-role="listview" data-inset="true" data-filter="true">
            </ul>
        </div>
        <div data-role="footer" data-position="fixed" dataid="footernav">
        </div>
    </div>
    <div data-role="footer" data-position="fixed" dataid="footernav">
    </div>
    </div>
</body>
</html>

并完成..享受；）

score 0 · Accepted Answer

您需要在 web 服务中将 byte[] 转换为“Convert.ToBase64String”，然后 javascript 以 base64 的形式理解图像字符串。在这里，我在我的网络服务中完成了以下代码。

//MyJs Code:

function getMyImage(id_No){
    $.support.cors= true;
    $.ajax({`enter code here`
        url: "http://someipaddreess/phonegap.asmx/spKP_MyImage",
        contentType: 'application/json;charset=utf-8',
        type: "POST",
        data: JSON.stringify({CSID_NO:getCSIDNumberByFK(id_No)}),
        async:false,
        dataType: "json",
        success : function(msg)  {
            var myImageStr = msg.d;
            $("#testImg").attr('src','data:image/jpeg;base64,' + myImageStr);
        },
        error: function(xhr, errorThrown, textStatus){
            window.alert("error: Failed to call WebService for measuring image" +  " " + textStatus);
        }
    });
}
//MyJs Code Ends here:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using Newtonsoft.Json;

using System.Data;
using System.IO;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Drawing;

namespace phonegap_webservices
{
    /// <summary>
    /// Summary description for phonegap
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    [System.Web.Script.Services.ScriptService]
    public class phonegap : System.Web.Services.WebService
    {                
        dalKPDataSQl tblKPDataSql = new dalKPDataSQl();
        dalBuilderPortal tblBuilderPortalSql = new dalBuilderPortal();

        [WebMethod]
        public string spKP_MyImage(long CSID_NO)
        {
            DataTable dt = new DataTable();                                       
            dt = tblKPDataSql.dtGetInfoByCSID("SP_ImageFunCall", CSID_NO);
            byte[] imageByteArray = (byte[])dt.Rows[0]["MyImage"];
            return Convert.ToBase64String(imageByteArray);
        }
    }
}

jquery - 如何使用 json 从 sql server ASP.net 中检索数据

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