标签：outp City HTTP 跨域 rs Country CompanyName conn 请求

如果你需要从不同的服务器（不同域名）上获取数据就需要使用跨域 HTTP 请求。

跨域请求在网页上非常常见。很多网页从不同服务器上载入 CSS, 图片，Js脚本等。

在现代浏览器中，为了数据的安全，所有请求被严格限制在同一域名下，如果需要调用不同站点的数据，需要通过跨域来解决。

1. PHP 和 MySql 代码实例
   <?php
   header("Access-Control-Allow-Origin: *");
   header("Content-Type: application/json; charset=UTF-8");

$conn = new mysqli("myServer", "myUser", "myPassword", "Northwind");

$result = $conn->query("SELECT CompanyName, City, Country FROM Customers");

$outp = "";
while($rs = $result->fetch_array(MYSQLI_ASSOC)) {
if ($outp != "") {$outp .= ",";}
$outp .= '{"Name":"' . $rs["CompanyName"] . '",';
$outp .= '"City":"' . $rs["City"] . '",';
$outp .= '"Country":"'. $rs["Country"] . '"}';
}
$outp ='{"records":['.$outp.']}';
$conn->close();

echo($outp);

www.djznrobot.com

?>

2. PHP 和 MS Access 代码实例
   <?php
   header("Access-Control-Allow-Origin: *");
   header("Content-Type: application/json; charset=ISO-8859-1");

$conn = new COM("ADODB.Connection");
$conn->open("PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=Northwind.mdb");

$rs = $conn->execute("SELECT CompanyName, City, Country FROM Customers");

$outp = "";
while (!$rs->EOF) {
if ($outp != "") {$outp .= ",";}
$outp .= '{"Name":"' . $rs["CompanyName"] . '",';
$outp .= '"City":"' . $rs["City"] . '",';
$outp .= '"Country":"'. $rs["Country"] . '"}';
$rs->MoveNext();
}
$outp ='{"records":['.$outp.']}';

$conn->close();

echo ($outp);
?>

3. ASP.NET, VB 和 MS Access 代码实例
   <%@ Import Namespace="System.IO"%>
   <%@ Import Namespace="System.Data"%>
   <%@ Import Namespace="System.Data.OleDb"%>
   <%
   Response.AppendHeader("Access-Control-Allow-Origin", "*")
   Response.AppendHeader("Content-type", "application/json")
   Dim conn As OleDbConnection
   Dim objAdapter As OleDbDataAdapter
   Dim objTable As DataTable
   Dim objRow As DataRow
   Dim objDataSet As New DataSet()
   Dim outp
   Dim c
   conn = New OledbConnection("Provider=Microsoft.Jet.OLEDB.4.0;data source=Northwind.mdb")
   objAdapter = New OledbDataAdapter("SELECT CompanyName, City, Country FROM Customers", conn)
   objAdapter.Fill(objDataSet, "myTable")
   objTable=objDataSet.Tables("myTable")

outp = ""
c = chr(34)
for each x in objTable.Rows
if outp <> "" then outp = outp & ","
outp = outp & "{" & c & "Name" & c & ":" & c & x("CompanyName") & c & ","
outp = outp & c & "City" & c & ":" & c & x("City") & c & ","
outp = outp & c & "Country" & c & ":" & c & x("Country") & c & "}"
next

outp ="{" & c & "records" & c & ":[" & outp & "]}"
response.write(outp)
conn.close
%>

4. ASP.NET, VB Razor 和 SQL Lite 代码实例br/>@{
   Response.AppendHeader("Access-Control-Allow-Origin", "*")
   Response.AppendHeader("Content-type", "application/json")
   var db = Database.Open("Northwind");
   var query = db.Query("SELECT CompanyName, City, Country FROM Customers");
   var outp =""
   var c = chr(34)
   }
   @foreach(var row in query)
   {
   if outp <> "" then outp = outp + ","
   outp = outp + "{" + c + "Name" + c + ":" + c + @row.CompanyName + c + ","
   outp = outp + c + "City" + c + ":" + c + @row.City + c + ","
   outp = outp + c + "Country" + c + ":" + c + @row.Country + c + "}"
   }
   outp ="{" + c + "records" + c + ":[" + outp + "]}"
   @outp
   

标签：outp,City,HTTP,跨域,rs,Country,CompanyName,conn,请求
来源： https://blog.51cto.com/13959155/2542969

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。