add simrs supporting functions

lib/PostgresDb.php

@@ -0,0 +1,57 @@
+<?php
+
+class PostgresDb
+{
+    private $pdo;
+
+    public function __construct()
+    {
+        $host = "10.10.123.238";
+        $port = "5432";
+        $dbname = "simrs";
+        $user = "brawijaya";
+        $password = "ub*2025";
+
+        $dsn = "pgsql:host=$host;port=$port;dbname=$dbname";
+
+        try {
+
+            $this->pdo = new PDO($dsn, $user, $password, [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
+            ]);
+
+        } catch (PDOException $e) {
+
+            die("Database connection failed: " . $e->getMessage());
+
+        }
+    }
+
+
+    public function query($sql, $params = [])
+    {
+        $stmt = $this->pdo->prepare($sql);
+        $stmt->execute($params);
+
+        return $stmt;
+    }
+
+
+    public function fetchAll($sql, $params = [])
+    {
+        return $this->query($sql, $params)->fetchAll();
+    }
+
+
+    public function fetch($sql, $params = [])
+    {
+        return $this->query($sql, $params)->fetch();
+    }
+
+
+    public function lastInsertId()
+    {
+        return $this->pdo->lastInsertId();
+    }
+}