Adding query class

Libraries/db/query.php

@@ -0,0 +1,53 @@
+<?php
+class Query {
+    private $table_name;
+    private array $columns_querying = array();
+    private int $limit=0;
+
+    public function __construct(string $table_name){
+        $this->table_name = $table_name;
+    }
+    public function set_columns($columns){
+        if (is_array($columns)){
+            $this->columns_querying = $columns;
+        } 
+    }
+
+    public function set_limit(int $limit){
+        if ($limit > 0){
+            $this->limit = $limit;
+        }
+    }
+
+    private function get_columns(){
+        $column_string="";
+
+        if (count($this->columns_querying) === 0){
+            $column_string="*";
+        } else {
+            $columns = implode(',', $this->columns_querying);
+            $column_string=$columns;
+        }
+        return $column_string;
+    }
+
+    private function get_limit() {
+        $modifier="";
+        if ($this->limit > 0){
+            $modifier=" LIMIT {$this->limit}";
+        }
+        return $modifier;
+    }
+
+    private function get_where() {
+        $where = "";
+        return $where;
+    }
+
+    public function get_query_string(){
+        $query = "SELECT {$this->get_columns()} FROM {$this->table_name}{$this->get_where()}{$this->get_limit()};";
+        return $query;
+    }
+
+}
+?>