The document provides an overview of Data Transaction Management (DTM), focusing on the techniques for transferring data between devices or platforms, primarily through direct port connections and web services. It explains how to utilize PHP for database connections, executing SQL queries, and generating JSON data from SQL results. Additionally, it discusses how web services enable data transactions without client-side installations, utilizing HTTP requests to send and receive data.

1. -Overview-
Data Transaction Management
(DTM)
Mr Hery
Dedicated to:
HIT Development Team
http://heryit.esy.es/hitworkstation
Hery Intelligent Technology® JM0670283-X
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2. What is DTM?
• A knowledge to manage data transaction between devices or
platform
• Understanding needs & purposes of data transaction
• Fulfilling safeness & effectiveness of data transaction

3. What is Data Transaction
• Transfer and receive data between devices or platform
• Commonly used transaction between Database Server and Client
Application (mobile app, desktop app, website)
MySQL
Database
Desktop
App
Mobile
App
Internet

4. Data Transaction Techniques
• Direct Port Connection Device-to-Device (D2D)
• Webservice (REST API– JSON Data)

5. Direct Port Connection Technique
• Connection between devices or platform direct to Database Server
• Commonly used in Web Application
• Example;
• Connection between PHP and MySQL Database.
• Client Application need a package installation of Database driver
• Example;
• Android (ART), Xamarin, Classic Windows etc.
• Example;
• Bluetooth, LAN Connection, InfraRed

6. How Direct Port Connection works?
• Example in PHP with MySQL Database (mysqli method)
Connect PHP to MySQL Database:
$conn = mysqli_connect(“database.host”, “db_username”, “db_password”, “db_name”);
//this method declared that $conn is a MySQL Connection
Querying SQL
$query = mysqli_query($conn, “SELECT * FROM users”);
//this method declared $query as an execution of a SQL Statement
//mysqli_query method require a MySQL Connection - $conn
Fetching Data (print out data) from SQL Query as an Array
$fetch = mysqli_fetch_array($query);
//mysqli_fetch method require a MySQL Query - $query
MySQL
Database
Apache PHP
Server

7. How Direct Port Connection works?
• Example in PHP with MySQL Database (mysqli method)
Fetching Data (print out data) from SQL Query as an Object
$fetch = mysqli_fetch_object($query);
//mysqli_fetch method require a MySQL Query - $query
Echo / Print out fetched data Array
echo $fetch[“column_name”];
//print single raw data
echo var_dump($fetch);
Echo / print out fetched data Object
echo $fetch->column_name;
//print single raw data

8. How Direct Port Connection works?
• Example in PHP with MySQL Database (mysqli method)
Generating JSON Data from fetched data Object (single data)
json_encode($fetch);
//Encoding fetch data object to JSON Data
//”echo json_encode()” can be use to print out fetched JSON Data
Generating JSON Data from fetched data Object (multiple data)
while($fetch = mysqli_fetch_object($query)){
$jsonArray[] = $fetch;
//create an Array of multiple Objects
}
json_encode($jsonArray);
//”echo json_encode($jsonArray)” can be use to print out fetched JSON Data

9. Webservice Technique
• Data Transaction between devices or platform via Webservice
• Transferring text-based data (such as JSON, XML, etc.)
• This technique does not require any installation on Client Application.
• Require HTTP Request method only.

10. Understanding Webservice
• Client Application send data (called parameter) called Request
• Client Application receive data (JSON Data) called Response
MySQL
Database
Desktop
App
Mobile
App
Internet
(Webservice)
Request
Response

11. Understanding Webservice
• Request (Header) Type
• GET
• Request GET parameter send via URL
• http://localhost.domain/index.php?user=aiman
• GET parameter is “user” and the value is “aiman”
• Multiple parameter send separate by “&” sign
(?user=aiman&age=18&address=Kluang..)
• POST
• Request POST parameter send via form-data
• This POST Request made secretly by the codes behind the web

12. Understanding Webservice
• PHP Handling GET Request
Read GET request parameter
$user = $_GET[“user”];
echo $user;
//data printed will be “aiman”
Read POST request parameter
$user = $_POST[“user”];
echo $user;
//data printed will be “aiman”

13. Understanding Webservice
• Generate JSON Data Response from Request Parameter with MySQL
Request : GET ?content=list&type=user
$type = $_GET[“type”];
$content = $_GET[“list”];
switch($content){
case “list”:
$sql = “SELECT * FROM $type”; //create SQL Statement
break;
}
$query = mysqli_query($conn, $sql); //create executed Query
while($fetch = mysqli_fetch_object($query)){ //fetching Data
$jsonArray[] = $fetch; //create Array of Objects
}
echo json_encode($jsonArray); //generate JSON Object from fetched Data

14. Thank You
Continue in the Next Chapter Data Transaction Security