refactoring

src/services/locationService.js

@@ -0,0 +1,37 @@
+import db from "../config/database.js";
+
+class LocationService {
+    static async getCountries() {
+        return await db.allAsync('SELECT DISTINCT country FROM locations ORDER BY country');
+    }
+
+    static async getCitiesByCountry(country) {
+        return await db.allAsync(
+            'SELECT DISTINCT city FROM locations WHERE country = ? ORDER BY city',
+            [country]
+        );
+    }
+
+    static async getDistrictsByCountryAndCity(country, city) {
+        return await db.allAsync(
+            'SELECT district FROM locations WHERE country = ? AND city = ? ORDER BY district',
+            [country, city]
+        );
+    }
+
+    static async getLocation(country, city, district) {
+        return await db.getAsync(
+            'SELECT id FROM locations WHERE country = ? AND city = ? AND district = ?',
+            [country, city, district]
+        );
+    }
+
+    static async getLocationById(locationId) {
+        return await db.getAsync(
+            'SELECT country, city, district FROM locations WHERE id = ?',
+            [locationId]
+        );
+    }
+}
+
+export default LocationService;