AngularJS快速入门指南09：SQL

　　我们可以将之前章节中的代码用来从数据库中读取数据。

通过php Server从MySQL数据库中获取数据

<div ng-app="myApp" ng-controller="customersCtrl"> <table>  <tr ng-repeat="x in names">    <td>{{ x.Name }}</td>    <td>{{ x.Country }}</td>  </tr></table></div><script>var app = angular.module('myApp', []);app.controller('customersCtrl', function($scope, $http) {    $http.get("http://customers_mysql.php")    .success(function (response) {$scope.names = response.records;});});</script>

通过asp.net Server从MSSQL数据库中获取数据

<div ng-app="myApp" ng-controller="customersCtrl"> <table>  <tr ng-repeat="x in names">    <td>{{ x.Name }}</td>    <td>{{ x.Country }}</td>  </tr></table></div><script>var app = angular.module('myApp', []);app.controller('customersCtrl', function($scope, $http) {    $http.get("http://customers_sql.aspx")    .success(function (response) {$scope.names = response.records;});});</script>

服务器代码示例

　　下面几小节列出了几种不同的服务器端代码，用来从数据库中获取数据。

　　1. 使用PHP和MySQL。返回JSON数据。

　　2. 使用PHP和MS access。返回JSON数据。

　　3. 使用ASP.NET，VB和MS Access。返回JSON数据。

　　4. 使用ASP.NET，Razor和SQL Lite。返回JSON数据。

跨站HTTP请求

　　从不同的服务器请求数据被称为跨站HTTP请求（即cross-site HTTP requests）。

　　跨站HTTP请求在web开发中很普遍。许多页面常常需要从不同的服务器加载各种资源，如CSS，images和scripts等。

　　在现代浏览器中，出于安全考虑，通过脚本进行跨站HTTP请求被严格限制，只允许访问同一站点内的数据。

　　下面这行代码被用在PHP中，用来允许跨站HTTP请求。

header("Access-Control-Allow-Origin: *");

1. 使用PHP和MySQL

<?phpheader("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);?>

2. 使用PHP和MS Access

<?phpheader("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. 使用ASP.NET，VB和MS Access

<%@ 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 OleDbConnectionDim objAdapter As OleDbDataAdapterDim objTable As DataTableDim objRow As DataRowDim objDataSet As New DataSet()Dim outpDim cconn = 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.Rowsif 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 & "}"nextoutp ="{" & c & "records" & c & ":[" & outp & "]}"response.write(outp)conn.close%>

4. 使用ASP.NET，Razor和SQL Lite

@{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