如何使用json从sql server ASP.net中检索数据
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我正在尝试使用带有C＃和jquery mobile的asp.net 3.5中的webservice来填充数据库中的列表。
它在我运行网站时工作正常，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>
它接口像json响应错误并生成错误但它从我的笔记本电脑执行代码时工作正常。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
答案
我修复了错误，实际上这不是我登录的错误和我的数据库中的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，我用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bage
<%@ 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;）
另一答案
你需要在webservice中将byte []转换为“Convert.ToBase64String”，然后javascript理解base64形式的图像字符串。在这里，我已经在我的webservice中使用了以下代码。
//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:以上是关于如何使用json从sql server ASP.net中检索数据的主要内容，如果未能解决你的问题，请参考以下文章
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