Web Services Tutorial 2
In this part of my web services tutorial I cover 2 ways to create XML from a database. I then show a simple example on how Remote Procedure Calls work.
If you missed the previous web services tutorial, where I showed how to work with JSON data, you should watch that first. All of the code used in this video can be found below.
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Code from the Video
xml_code.php
<?php
// Tell whomever is receiving this data the content type
// Needs to be set on the first line
// header('Content-Type: text/xml');
// Insert to the StudentDB class
require_once('StudentDB.php');
// XML is used when you want to provide detailed information
// about your data like attributes and data type
$dale_cooper = array("Dale", "Cooper", "123 Main St",
"Seattle", "Washington");
// Define that all data will be between 2 <student> tags </student>
$xml = new SimpleXMLElement("<student />");
// Get each piece of data from the array and put it between <data> tags
foreach($dale_cooper as $info){
$xml->addChild("data", $info);
}
// Generate a DOM document we can style
// A DOM Document represents an entire XML document
$dom = dom_import_simplexml($xml)->ownerDocument;
// State we want the data to be indented
$dom->formatOutput = true;
// saveXML converts the XML into a string to print
echo $dom->saveXML();
// Get a connection to the database
require_once('../../mysqli_connect.php');
// Check the connection
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
// Query retrieves the student data
$query = "SELECT * FROM students WHERE student_id = 1";
// Will hold all students retreived
$student_array = array();
if($result = $dbc->query($query)){
while ($obj = $result->fetch_object()){
printf("%s %s %s %s %s %s %s %s %s %s %s %s %s <br />",
$obj->first_name, $obj->last_name, $obj->email,
$obj->street, $obj->city, $obj->state, $obj->zip,
$obj->phone, $obj->birth_date, $obj->sex,
$obj->date_entered, $obj->lunch_cost, $obj->student_id);
$temp_student = new StudentDB($obj->first_name,
$obj->last_name, $obj->email, $obj->street,
$obj->city, $obj->state, $obj->zip, $obj->phone,
$obj->birth_date, $obj->sex, $obj->date_entered,
$obj->lunch_cost, $obj->studentid);
$student_array[] = $temp_student;
}
}
echo '<?xml version="1.0" encoding="UTF-8" ?>';
echo '<students>';
// Cycle through all the students and print them surrounded by tags
foreach($student_array[0] as $key=>$value){
echo '<' . $key . '>' . $value . '</' . $key . '>';
}
echo '</students>';
?>
Students.php
<?php
class Students{
public function getStudentFirstName(){
$studentFN = array("Dale", "Harry", "Shelly", "Bobby",
"Donna", "Audrey", "James", "Lucy", "Tommy",
"Andy", "John");
return $studentFN;
}
public function getStudentLastName(){
$studentLN = array("Cooper", "Truman", "Johnson", "Briggs",
"Hayward", "Horne", "Hurley", "Moran", "Hill",
"Brennan", "Smith");
return $studentLN;
}
}
?>
rpc_code.php
<html>
<?php
// RPC (Remote Procedure Call) is used to call a function remotely
// You include the function name to execute and maybe attributes
// Insert to the Students class
require_once('Students.php');
$student_data = new Students();
if(isset($_POST['submit'])){
switch($_POST['request']){
case "Get First Names" :
$student_info = $student_data->getStudentFirstNames();
break;
case "Get Last Names" :
$student_info = $student_data->getStudentLastNames();
break;
default:
http_response_code(400);
}
echo json_encode($student_info);
}
?>
<form action="rpc_code.php" method="post">
Request:
<select name="request">
<option>Get First Names</option>
<option>Get Last Names</option>
</select>
<input type="submit" name="submit">
</form>
</html>
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