Android Paginate JSON Data from PHP Mysql to App - php

Question

The below PHP code gets all data from a MySQL DB and sends it to an android app. I want the data to be paginated.
ALL DATA PHP CODE
<?php
include 'dbconfig.php';
try {
$conn = new PDO("mysql:host=$HostName;dbname=$DatabaseName", $HostUser, $HostPass);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("SELECT * FROM `tiffa`");
$stmt->execute();
$data = array();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$data[] = $row;
}
header('Content-Type:Application/json');
echo json_encode($data);
} catch (PDOException $e) {
print "Connection failed! Please Try Again Or Contact Us: " . $e->getMessage() . "<br/>";
die();
$conn = null;
}
POJO/DATA MODEL CLASS
public class ImageList {
#SerializedName("image1name")
private String name;
#SerializedName("county")
private String county;
#SerializedName("image1URL")
private String imageurl;
#SerializedName("image2URL")
private String image2url;
public ImageList(String name,String county,String imageurl, String image2url) {
this.name = name;
this.county = county;
this.imageurl = imageurl;
this.image2url = image2url;
}
public String getName() {
return name;
}
String getCounty() {
return county;
}
String getImageurl() {
return imageurl;
}
String getImage2url() {
return image2url;
}
}
I have tried to pass the page_number and item_count (which come from the app) but I can't seem to get it. Here is my tried PHP Code. The POJO remains the same.
<?php
$page_number = $_GET['page_number'];
$item_count = $_GET['item_count'];
$from = $page_number * $item_count - ($item_count - 1);
$to = $page_number * $item_count;
$data = array();
include 'dbconfig.php';
try {
$conn = new PDO("mysql:host=$HostName;dbname=$DatabaseName", $HostUser, $HostPass);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("SELECT * FROM `tiffa`");
$stmt->execute();
if ($to > $stmt) {
array_push($response, array('status' => 'end'));
echo json_encode($response);
} else {
$data = array();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$data[] = $row;
}
header('Content-Type:Application/json');
echo json_encode($data);
}
array_push($response, array('images' => $images));
sleep(2);
echo json_encode($response);
catch (PDOException $e) {
print "Connection failed! Please Try Again Or Contact Us: " . $e->getMessage() . "<br/>";
die();
$conn = null;
}

Answer 1

Thanks for the leads #Nigel Ren. I resolved this by
<?php
$page_number = $_GET['page_no'];
$item_count = $_GET['item_cnt'];
$from = $page_number*$item_count - ($item_count-1);
$to = $page_number*$item_count;
$response=array();
$stats=array();
include 'dbconfig.php';
// Create connection
$conn = new mysqli($HostName, $HostUser, $HostPass, $DatabaseName);
$total = mysqli_num_rows(mysqli_query($conn, "SELECT id from db1"));
if($to>$total)
{
array_push($response,array('status'=>'end'));
echo json_encode($response);
}
else
{
array_push($response,array('status'=>'ok'));
$count = $from;
$images = array();
$start = ($page - 1) * $limit;
//SQL query to fetch data of a range
$sql = "SELECT * from db1 limit $start, $item_count";
//Getting result
$result = mysqli_query($conn,$sql);
//Adding results to an array
$res = array();
while($row = mysqli_fetch_array($result))
{
$image122 = $row['image122'];
$image_path = $image122;
array_push($images,array('id'=>$count,'image_path'=>$image_path));
$count = $count+1;
}
array_push($response,array('images'=>$images));
sleep(2);
echo json_encode($response);
}
?>