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

<?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);
?>

2. 使用PHP和MS Access

<?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. 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 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()
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. 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()
}
@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
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