AngularJS快速入門指南09：SQL

　　我們可以將之前章節中的代碼用來從數據庫中讀取數據。

---

通過PHP Server從MySQL數據庫中獲取數據

<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>

---

通過ASP.NET Server從MSSQL數據庫中獲取數據

<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>

---

服務器代碼示例

　　下面幾小節列出了幾種不同的服務器端代碼，用來從數據庫中獲取數據。

　　1. 使用PHP和MySQL。返回JSON數據。

　　2. 使用PHP和MS Access。返回JSON數據。

　　3. 使用ASP.NET，VB和MS Access。返回JSON數據。

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

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跨站HTTP請求

　　從不同的服務器請求數據被稱為跨站HTTP請求（即cross-site HTTP requests）。

　　跨站HTTP請求在web開發中很普遍。許多頁面常常需要從不同的服務器加載各種資源，如CSS，images和scripts等。

　　在現代瀏覽器中，出於安全考慮，通過腳本進行跨站HTTP請求被嚴格限制，只允許訪問同一站點內的數據。

　　下面這行代碼被用在PHP中，用來允許跨站HTTP請求。

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(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. 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

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