AngularJS快速入门指南09：SQL

2022-11-13 20:22:13

　　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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