updated DB engine

DBEngine.h

@@ -6,20 +6,16 @@
 using namespace std;
 
 class DBEngine {
-	//member variables
-	//NOT DONE
-	//vector<Relation> tables;
+	vector<Relation> tables;
 
 public:
 	DBEngine();
-	void createCmd();
-	//void openCmd();
-	void saveCmd();
-	void showCmd();
-	void insertQuery();
-	void deleteQuery();
-	void selectQuery();
-	void projectQuery();
-	void productQuery();
-	bool unionComp();
+	
+	void addRelation(Relation r) {
+		tables.push_back(r);
+	}
+	
+	vector<Relation> getRelations() {
+		return tables;
+	}
 };