PHP: Fatal error: Uncaught PDOException: SQLSTATE[HY000] - php

Question

I have a class named player that creates, deletes and controls if a player entity exists. In another file, I have the database connection with PDO and, finally, in third file I have the call to player class. Here's all the code:
file: player.php
<?php
class player
{
private $pdo;
private $network_id;
public $color;
public function __construct($pdo, $network_id, $color)
{
$this->pdo = $pdo;
$this->network_id = $network_id;
$this->color = $color;
}
public function create_player()
{
if(!$this->exists_player())
{
$sql = 'INSERT INTO players SET network_id = :network_id';
$query = $this->pdo->prepare($sql);
$query->execute(array(':network_id' => $this->network_id));
}
else
{
echo 'error';
}
}
public function delete_player()
{
if($this->exists_player())
{
$sql = 'DELETE FROM players WHERE network_id = :network_id';
$query = $this->pdo->prepare($sql);
$query->execute(array(':network_id' => $this->network_id));
}
else
{
return -1;
}
}
private function exists_player()
{
$sql = 'SELECT COUNT(*) FROM players WHERE network_id = '.$this->network_id;
$result = $this->pdo->exec($sql);
if($result > 0) return true;
else return false;
}
}
?>
file: test.php
<?php
include './Php/db_connection.php';
include './Php/player.php';
$player = new player($pdo, 1112, 'red');
$player->create_player();
?>
file: db_connection.php
$pdo = new PDO('mysql:host=localhost; dbname=myDbName', 'dbUtent', 'myPassword');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
The thing is that when I call test.php, I get this error:
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute. in F:\Software\Coding_Development_Software\Server\wamp\www\myProject\Ajax\Cube\Php\player.php on line 21
All code is an exemple.
Any ideas?

Answer 1

The thing here is that you need to fetch until it fails for a row fetch attempt. In fact, your own exception is telling you the solution:
Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute. in F:\Software\Coding_Development_Software\Server\wamp\www\myProject\Ajax\Cube\Php\player.php on line 21