diff --git a/db/device.db.js b/db/device.db.js
new file mode 100644
index 0000000..b92b754
--- /dev/null
+++ b/db/device.db.js
@@ -0,0 +1,76 @@
+const pool = require("../config");
+
+// Get all devices
+const getAllDevicesDb = async () => {
+  const queryText = `
+    SELECT *
+    FROM m_device
+    WHERE deleted_at IS NULL
+    ORDER BY device_id ASC
+  `;
+  const result = await pool.query(queryText);
+  return result.recordset;
+};
+
+// Get device by ID
+const getDeviceByIdDb = async (id) => {
+  const queryText = `
+    SELECT *
+    FROM m_device
+    WHERE device_id = $1
+      AND deleted_at IS NULL
+  `;
+  const result = await pool.query(queryText, [id]);
+  return result.recordset[0];
+};
+
+// Get device by device_code
+const getDeviceByCodeDb = async (code) => {
+  const queryText = `
+    SELECT *
+    FROM m_device
+    WHERE device_code = $1
+      AND deleted_at IS NULL
+  `;
+  const result = await pool.query(queryText, [code]);
+  return result.recordset[0];
+};
+
+// Create device
+const createDeviceDb = async (data) => {
+  const { query: queryText, values } = pool.buildDynamicInsert("m_device", data);
+  const result = await pool.query(queryText, values);
+  const insertedId = result.recordset[0]?.inserted_id;
+  if (!insertedId) return null;
+
+  return getDeviceByIdDb(insertedId);
+};
+
+// Update device
+const updateDeviceDb = async (id, data) => {
+  const { query: queryText, values } = pool.buildDynamicUpdate("m_device", data, { device_id: id });
+  await pool.query(queryText, values);
+  return getDeviceByIdDb(id);
+};
+
+// Soft delete device
+const softDeleteDeviceDb = async (id, deletedBy) => {
+  const queryText = `
+    UPDATE m_device
+    SET deleted_at = GETDATE(),
+        deleted_by = $1
+    WHERE device_id = $2
+      AND deleted_at IS NULL
+  `;
+  await pool.query(queryText, [deletedBy, id]);
+  return true;
+};
+
+module.exports = {
+  getAllDevicesDb,
+  getDeviceByIdDb,
+  getDeviceByCodeDb,
+  createDeviceDb,
+  updateDeviceDb,
+  softDeleteDeviceDb,
+};