feat: ✨ add first draft of MySQL adapter class

www/mysql_adapter.php

@@ -0,0 +1,80 @@
+<?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; 
+	}
+}
+
+?>