Added SQL, dao and app - not functional

functions/database.py

@@ -0,0 +1,28 @@
+import mysql.connector
+from mysql.connector import Error
+from config.db_config import db_config
+
+def get_db_connection():
+    try:
+        connection = mysql.connector.connect(**db_config)
+        return connection
+    except Error as e:
+        print(f"Error connecting to database: {e}")
+        return None
+
+def execute_query(query, params=None):
+    connection = get_db_connection()
+    if connection is None:
+        return None
+    try:
+        cursor = connection.cursor(dictionary=True)
+        cursor.execute(query, params)
+        connection.commit()
+        return cursor
+    except Error as e:
+        print(f"Error executing query: {e}")
+        return None
+    finally:
+        if connection.is_connected():
+            cursor.close()
+            connection.close()