updating structure

Attribute.h

@@ -0,0 +1,37 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+//Funtional, might need more functionality
+
+template<typename T>
+class Attribute {
+	//a named column of a relation
+	string name;
+	vector<T> values;
+	bool isKey;
+	int size;
+public:
+	Attribute(){  }
+	
+	Attribute(vector<T> v){ 
+		this.values = v; 
+	}
+	
+	Attribute(const Attribute<T>& a){ 
+		this.values = a.getAll(); 
+	}
+	
+	Attribute& operator=(const Attribute<T>& a){ 
+		this.values = a.getAll(); 
+	}
+	
+	string getName(){ 
+		return name; 
+	}
+	
+	vector<T> getAll(){
+		return this.values;
+	}
+};

DBEngine.cpp

@@ -0,0 +1,57 @@
+#include "DBEngine.h"
+
+using namespace std;
+
+DBEngine::DBEngine(){
+	//
+}
+
+//create a new table in memory
+void DBEngine::createCmd(){
+	//
+}
+	
+//open a txt file, parse SQL script, load data in table
+//void DBEngine::openCmd(){
+	//
+//}
+
+//should write cmdList to a .txt file
+void DBEngine::saveCmd(){
+	//
+}
+
+//display the database
+void DBEngine::showCmd(){
+	//
+}
+
+//add a tuple to a table in the memory
+void DBEngine::insertQuery(){
+	//
+}
+
+//remove a tuple from a table in the memory
+void DBEngine::deleteQuery(){
+	//
+}
+
+//search and return one more tuples from a table in the memory
+void DBEngine::selectQuery(){
+	//
+}
+
+//return a subset of attributes (columns)
+void DBEngine::projectQuery(){
+	//
+}
+
+//each row in the first table is paired with all the rows in the second table
+void DBEngine::productQuery(){
+	//
+}
+
+//true if relations have the same # of attributes and each attribute must be from the same domain
+bool DBEngine::unionComp(){
+	return false;
+}

DBEngine.h

@@ -0,0 +1,25 @@
+#include <fstream>
+#include <iostream>
+#include <vector>
+#include "Relation.h"
+
+using namespace std;
+
+class DBEngine {
+	//member variables
+	//NOT DONE
+	//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();
+};

Relation.h

@@ -0,0 +1,16 @@
+#include <iostream>
+#include <vector>
+#include "Attribute.h"
+
+using namespace std;
+
+//NOT DONE
+class Relation {
+	//a table with rows and columns
+	string name;
+	vector< Attribute<T> > att;
+public:
+	Relation();
+	Relation(vector< Attribute<T> > a) { att = a; }
+	void addTuple(vector< Attribute<T> > tuple);
+};

test.cpp

@@ -1,26 +1,10 @@
 #include <iostream>
-#include "db_engine.h"
+#include "DBEngine.h"
 
 using namespace std;
 
 int main() {
-	db_engine engine;
-
-	vector<string> attributes;
-	vector<string> pkeys;
-	//we need a better way to do this
-	//going for function right now
-	attributes.push_back("username VARCHAR(20)");
-	attributes.push_back("password VARCHAR(20)");
-	pkeys.push_back("password");
-	
-	engine.createCmd("users", attributes, pkeys);
-
-	vector<string> tuple;
-	tuple.push_back("csce315");
-	tuple.push_back("12345");
-	
-	engine.insertQuery("users", tuple);
-	
-	engine.saveCmd();
+	DBEngine engine;
+	Relation r;
+	Attribute<int> a;
 }