diff --git a/db_engine.h b/db_engine.h
index f319f02..05e7b60 100755
--- a/db_engine.h
+++ b/db_engine.h
@@ -1,12 +1,19 @@
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
 class db_engine {
-	//member variables
+	vector<string> cmdList;
+	//vector<vector<string>> table;
 
 public:
 	db_engine();
-	void createCmd();
+	void createCmd(string tableName, vector<string> attributes, vector<string> pkeys);
 	//void openCmd();
 	void saveCmd();
-	void showCmd();
+	void showCmd(string tableName);
 	void insertQuery();
 	void deleteQuery();
 	void selectQuery();