PHP - failed to output no data where no data in table - php

Question

I've tried to find any reference to display data where no data in table for an hours, but I'm not yet found a code to fix the issue
I've this code:
//function
function readAll(){
$query = "SELECT * FROM ".$this->table_name." ORDER BY id_nilai ASC";
$stmt = $this->conn->prepare( $query );
$stmt->execute();
return $stmt;
}
//execute
$pro3 = new Nilai($db);
$stmt3 = $pro3->readAll();
while ($row3 = $stmt3->fetch(PDO::FETCH_ASSOC)){
// not yet fix how to display no data
//if($row3==false){ tried to change $row3==0 still won't work
//echo "No Data";
//}
//die(var_dump($row3)); showing `bool(false)`
echo $row3['ket_nilai'] (echo $row3['jum_nilai'])
}
any idea how to do?

Answer 1

I want to display some text when no data found in database table
You need to fetch the results before entering the loop, check if you do get the results then if you do enter the loop else display the message
see bellow code :
<?php
//function
function readAll(){
$query = "SELECT * FROM ".$this->table_name." ORDER BY id_nilai ASC";
$stmt = $this->conn->prepare( $query );
$stmt->execute();
return $stmt;
}
//execute
$pro3 = new Nilai($db);
$stmt3 = $pro3->readAll();
$results = $stmt3->fetchall(PDO::FETCH_ASSOC);
if(count($results) > 0){
foreach($results as $row3){
//display them
echo $row3['ket_nilai'] ;
echo $row3['jum_nilai'];
}
}else{
echo "No data available";
}
?>