tutorial pengembangan web terbaru
 

W3Data Server

❮ Sebelumnya Berikutnya Bab ❯

Data Dari Server

Data yang digunakan dalam bab sebelumnya diambil dari server.

Server kode untuk mengambil data dinamis dari database dapat ditulis dalam berbagai bahasa.

Berikut adalah beberapa contoh:

Server Menjalankan PHP dan MySQL

<?php
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");

$conn = new mysqli("myServer", "user", "pass", "myDB");

$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"]     . '"}';
}
$outp ='{"customers":['.$outp.']}';

$conn->close();

echo($outp);
?>

Permintaan HTTP Cross-Site

Permintaan data dari server yang berbeda (dari halaman yang meminta), disebut permintaan HTTP cross-site.

permintaan cross-site sangat umum di web. Banyak halaman memuat css, gambar, atau script dari server yang berbeda.

Di browser modern, permintaan HTTP lintas situs dari script dibatasi ke situs yang sama untuk alasan keamanan.

Baris berikut (dalam contoh PHP di atas) dapat ditambahkan untuk memungkinkan akses ke halaman dari cross-site:

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

Server Menjalankan Node.js dan MySQL

var express = require('express');
var app = express();

app.get('/', function (req, res) {
  var sql = require("mssql");
  var config = {user:'user', password:'pass', server:'myServer', database:'myDB'};
  sql.connect(config, function (err) {
    if (err) console.log(err);
    var request = new sql.Request();
    request.query('SELECT CompanyName, City, Country FROM Customers', function (err, recordset) {
      if (err) console.log(err)
      res.send(recordset);
    });
  });
});

var server = app.listen(5000, function () {
console.log('Server is running..');
});

Server Menjalankan ASP.NET, Razor dan SQL Lite

@{
Response.AppendHeader("Access-Control-Allow-Origin", "*")
Response.AppendHeader("Content-type", "application/json")
var db = Database.Open("myDB");
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 + "customers" + c + ":[" + outp + "]}"
@outp

Server Menjalankan PHP dan 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=myDB.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();
}
$outp ='{"customers":['.$outp.']}';

$conn->close();
echo ($outp);
?>

Server Menjalankan ASP.NET, VB dan 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=myDB.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 & "customers" & c & ":[" & outp & "]}"

conn.close
response.write(outp)
%>

❮ Sebelumnya Berikutnya Bab ❯