diff --git a/public/api/_db.php b/public/api/_db.php
index 943fc92..708ff5c 100755
--- a/public/api/_db.php
+++ b/public/api/_db.php
@@ -1,13 +1,7 @@
 <?php
-// public/api/_db.php
-$cfg = require __DIR__ . '/../../src/config.php';
-$dsn = "mysql:host={$cfg['db_host']};dbname={$cfg['db_name']};charset={$cfg['db_charset']}";
-$options = [
-    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
-    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
-];
 try {
-    $pdo = new PDO($dsn, $cfg['db_user'], $cfg['db_pass'], $options);
+    require_once __DIR__ . '/../../tools/db.php';
+    $pdo = tools_build_pdo();
 } catch (PDOException $e) {
     http_response_code(500);
     header('Content-Type: application/json');
diff --git a/public/api/printers.php b/public/api/printers.php
index c560186..1adb40e 100755
--- a/public/api/printers.php
+++ b/public/api/printers.php
@@ -2,5 +2,6 @@
 // public/api/printers.php
 header('Content-Type: application/json; charset=utf-8');
 require __DIR__ . '/_db.php';
-$stmt = $pdo->query("SELECT * FROM printers WHERE is_active = 1 ORDER BY name");
-echo json_encode($stmt->fetchAll(), JSON_UNESCAPED_UNICODE);
+require_once __DIR__ . '/../../tools/printers.php';
+$printers = tools_fetch_active_printers($pdo);
+echo json_encode($printers, JSON_UNESCAPED_UNICODE);
diff --git a/tools/db.php b/tools/db.php
new file mode 100644
index 0000000..2a61402
--- /dev/null
+++ b/tools/db.php
@@ -0,0 +1,12 @@
+<?php
+function tools_build_pdo(): PDO
+{
+    $cfg = require __DIR__ . '/../src/config.php';
+    $dsn = "mysql:host={$cfg['db_host']};dbname={$cfg['db_name']};charset={$cfg['db_charset']}";
+    $options = [
+        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    ];
+
+    return new PDO($dsn, $cfg['db_user'], $cfg['db_pass'], $options);
+}
diff --git a/tools/printers.php b/tools/printers.php
new file mode 100644
index 0000000..674261c
--- /dev/null
+++ b/tools/printers.php
@@ -0,0 +1,6 @@
+<?php
+function tools_fetch_active_printers(PDO $pdo): array
+{
+    $stmt = $pdo->query("SELECT * FROM printers WHERE is_active = 1 ORDER BY name");
+    return $stmt->fetchAll();
+}