dragon_fire/www/mysql_adapter.php

<?php

class MySQLAdapter {
	public $raw;

	function __construct() {
		$this->raw = mysqli_connect('mysql', 'root', 'example', 'dragon_fire');

		if (!$this->raw)
		{
		echo 'Connection failed<br>';
		echo 'Error number: ' . mysqli_connect_errno() . '<br>';
		echo 'Error message: ' . mysqli_connect_error() . '<br>';
		die();
		}
	}

	function _exec($qery, $argtypes, ...$args) {
		$stmt = $this->raw->prepare($qery);
		$stmt->bind_param($argtypes, ...$args);
		$stmt->execute();

		return $stmt->get_result();
	}

	function _prepare_post_data($post_data) {
    	if($post_data == null) {
       		$post_data = [
        		"found" => false
        	];
    	}
    	else {
	  		$post_data["found"] = true;
   		$post_data["post_metadata"] = json_decode($post_data["post_metadata"]);
    	}
    	
    	return $post_data;
	}

	function get_post_by_path($post_path, $with_subposts = true) {
		$qry = "SELECT * FROM posts WHERE post_path = ?";

		$post_path = chop($post_path, '/');

		$post_data = $this->_prepare_post_data($this->_exec($qry, "s", $post_path)->fetch_assoc());

		if($with_subposts) {
			$post_data['subposts'] = $this->get_subposts_by_path($post_path);
		}

		return $post_data;
	}

	function get_subposts_by_path($path) {
	    global $sql;
	
	    $path = chop($path, '/');
	
	    $path_depth = substr_count($path, "/");
	
	    $qry = "SELECT post_path, post_metadata
	        FROM posts 
	        WHERE (post_path LIKE CONCAT(?,'/%')) 
	            AND post_path_depth = ?
	            ORDER BY post_create_time DESC
	            LIMIT 10";

	   $post_data = $this->_exec($qry, "si", $path, $path_depth)->fetch_all(MYSQLI_ASSOC);

		$fn = function($data) {
			return $this->_prepare_post_data($data);
		};
		
	    $post_data = array_map($fn, $post_data);
	
	    return $post_data; 
	}
}

?>