How to check if rows exist PDO PHP? [duplicate] - php

Question

This question already has answers here:
How to check if a row exist in the database using PDO?
(3 answers)
Closed 5 years ago.
I'm learning PHP PDO and I need some help with codes. I have 2 Questions today.
First Question:
How can I check if row exist in table with Network_Code and Niche, if there is column with same ID to proceed, but with same ID and Niche to die message.
$network_code = $_GET[ 'ID' ];
$Niche = $_GET[ 'Niche' ];
$sql = "INSERT INTO `affiliates` (ID, Niche, Language, lockerURL, Network_Code, Google_ID) VALUES (NULL, '$Niche', '$Language', '$domain', '$network_code ', '$Google_ID')";
$query = $pdo->prepare( $sql );
$query->execute();
Second Question:
Is there any other way that I can use: $system_default[ 0 ]->column because I think that is wrong way, so I need something like this: $system_default->column
class default_system {
function __construct( $pdo ) {
$this->pdo = $pdo;
}
function getData() {
$ID = $_GET[ 'id' ];
$Niche = "clash-clans";
$query = $this->pdo->prepare( "SELECT * FROM `affiliates` WHERE `Network_Code` = '$ID' AND `Niche` = '$Niche'" );
$query->execute();
return $query->fetchAll( PDO::FETCH_OBJ ); // Return an Array of objects
}
}
$db_system = new default_system( $pdo );
$system_default = $db_system->getData();
echo $system_default[ 0 ]->lockerURL;

Answer 1

Below example for First Question, you can try to solve your problem certain ways below is example of it. you can read more about pdo from here
$query=$dbh->prepare("SELECT secret FROM users WHERE username=:param");
$query->bindParam(':param', $param);
$query->execute();
$result = $query -> fetch();
print_r($result);
For second issue
echo $system_default['lockerURL'];
and remove echo $system_default[ 0 ]->lockerURL; line