diff --git a/lib/PostgresDb.php b/lib/PostgresDb.php
new file mode 100644
index 0000000..94ee75e
--- /dev/null
+++ b/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 $this->pdo->lastInsertId();
+    }
+}
\ No newline at end of file
diff --git a/lib/functions.php b/lib/functions.php
new file mode 100644
index 0000000..ed47710
--- /dev/null
+++ b/lib/functions.php
@@ -0,0 +1,37 @@
+<?php
+if (!function_exists('form_dropdown')) {
+    function form_dropdown($name = '', $options = array(), $selected = array(), $extra = '', $callback = null)
+    {
+        if (!is_array($selected)) {
+            $selected = array($selected);
+        }
+        // If no selected state was submitted we will attempt to set it automatically
+        if (count($selected) === 0) {
+            // If the form name appears in the $_POST array we have a winner!
+            if (isset($_POST[$name])) {
+                $selected = array($_POST[$name]);
+            }
+        }
+        if ($extra != '') $extra = ' ' . $extra;
+        $multiple = (count($selected) > 1 && strpos($extra, 'multiple') === FALSE) ? ' multiple="multiple"' : '';
+        $form = '<select name="' . $name . '"' . $extra . $multiple . ">\n";
+        foreach ($options as $key => $val) {
+            $key = (string)$key;
+            if (is_array($val) && !empty($val)) {
+                $form .= '<optgroup label="' . $key . '">' . "\n";
+                foreach ($val as $optgroup_key => $optgroup_val) {
+                    $sel = (in_array($optgroup_key, $selected)) ? ' selected="selected"' : '';
+                    $form .= '<option value="' . $optgroup_key . '"' . $sel . '>' . (string)$optgroup_val . "</option>\n";
+                }
+                $form .= '</optgroup>' . "\n";
+            } else {
+                $val = ($callback != '') ? $callback($val) : $val;
+                $sel = (in_array($key, $selected)) ? ' selected="selected"' : '';
+                $form .= '<option value="' . $key . '"' . $sel . '>' . (string)$val . "</option>\n";
+            }
+        }
+        $form .= '</select>';
+        return $form;
+    }
+}
+?>
\ No newline at end of file