Updated DBEngine functions

Attribute.cpp

@@ -0,0 +1,57 @@
+#include <iostream>
+#include <vector>
+#include "Attribute.h"
+
+Attribute::Attribute(string n, string t, bool k){ 
+	name = n;
+	type = t;
+	key = k;
+	size = 0;
+}
+
+void Attribute::addCell(string v){
+	values.push_back(v);
+	size++;
+}
+
+string Attribute::operator[](int i){ 
+	return values[i]; 
+}
+
+vector<string> Attribute::getValues(){ 
+	return values; 
+}
+
+string Attribute::getName(){ 
+	return name; 
+}
+
+string Attribute::getType(){ 
+	return type; 
+}
+
+bool Attribute::isKey(){ 
+	return key; 
+}
+
+void Attribute::setName(string s){
+	name = s;
+}
+
+//may need to change primary key implementation
+int Attribute::getSize(){ 
+	return size; 
+} 
+
+void Attribute::display(){
+	cout << "-------------\n";
+	cout << name << "\n" << type << "\n\n";
+	
+	vector<string>::iterator it = values.begin();
+	while (it != values.end()){
+		cout << *it << "\n";
+		it++;
+	}
+	
+	cout << "-------------\n";
+}

Attribute.h

@@ -3,9 +3,6 @@
 
 using namespace std;
 
-//Funtional, might need more functionality
-
-//template<typename T>
 class Attribute{
 	vector<string> values;
 	string name;
@@ -14,35 +11,14 @@ class Attribute{
 	int size;
 	
 public:
-	Attribute(string n, string t, bool k){ 
+	Attribute(string n, string t, bool k);
-		name = n;
+	void addCell(string v);
-		type = t;
+	string operator[](int i);
-		key = k;
+	vector<string> getValues();
-		size = 0;
+	string getName();
-	}
+	string getType();
-	
+	bool isKey();
-	void addCell(string v){
+	int getSize();
-		values.push_back(v);
+	void setName(string s);
-		size++;
+	void display();
-	}
-	
-	string operator[](int i){ return values[i]; }
-	vector<string> getValues(){ return values; }
-	string getName(){ return name; }
-	string getType(){ return type; }
-	bool isKey(){ return key; }
-	int getSize(){ return size; } //may need to change primary key implementation
-	
-	void display(){
-		cout << "-------------\n";
-		cout << name << "\n" << type << "\n\n";
-		
-		vector<string>::iterator it = values.begin();
-		while (it != values.end()){
-			cout << *it << "\n";
-			it++;
-		}
-		
-		cout << "-------------\n";
-	}	
 };

DBEngine.cpp

@@ -0,0 +1,70 @@
+#include <fstream>
+#include <iostream>
+#include <vector>
+#include "DBEngine.h"
+
+DBEngine::DBEngine(){
+	size = 0;
+}
+
+void DBEngine::createTable(string n){
+	Relation r(n);
+	tables.push_back(r);
+	size++;
+}
+
+void DBEngine::createTable(string n, vector<Attribute> a){
+	Relation r(n, a);
+	tables.push_back(r);
+	size++;
+}
+	
+void DBEngine::createTable(Relation r){ 
+	tables.push_back(r); 
+	size++;
+}
+	
+vector<Relation> DBEngine::getRelations(){ 
+	return tables; 
+}
+	
+Relation DBEngine::getTableFromName(string n){
+	//will return first occurence
+	for(int i = 0; i < tables.size(); i++){
+		if (tables[i].getTableName() == n){
+			return tables[i];
+		}
+	}
+}
+
+void DBEngine::saveToFile(vector<string> cmds){ 
+	//writes nothing meaningful
+	ofstream file;
+	file.open("savefile.db");
+	
+	for(int i = 0; i < cmds.size(); ++i){
+		file << cmds[i] << endl;
+	}
+	
+	file.close();
+}
+
+//assumes that all attribute titles are unique
+Relation DBEngine::projection(vector<string> input, Relation r){
+	
+	
+//	for(int i = 0; i < input.size(); i++) {
+//		it = find(r.getAttributes().begin(), r.getAttributes().end(), input[i])
+		
+		//if(r[i].getName == input[])
+//	}
+}
+/*
+void renameAttribute(vector<Attribute> v, string o, string s){
+	for(int i = 0; i < v.size(); ++i){
+		if(v[i].getName() == o){
+			v[i].setName(s);
+		}
+	}
+}
+*/

DBEngine.h

@@ -4,53 +4,25 @@
 #include "Relation.h"
 
 //still in progress
-class DBEngine {
+class DBEngine{
 	vector<Relation> tables;
 	int size;
 
 public:
-	DBEngine(){
+	DBEngine();
-		size = 0;
+	void createTable(string n);
-	}
+	void createTable(string n, vector<Attribute> a);
+	void createTable(Relation r);
+	vector<Relation> getRelations();
+	//void showTable(Relation r);
+	Relation getTableFromName(string n);
+	void saveToFile(vector<string> cmds);
 	
-	void createTable(string n) {
+	//operations
-		Relation r(n);
+	//void selection();
-		tables.push_back(r);
+	Relation projection(vector<string> input, Relation r);
-		size++;
+	//void renaming();
-	}
+	//void setUnion();
-
+	//void setDiff();
-	void createTable(string n, vector<Attribute> a) {
+	//void crossProduct();
-		Relation r(n, a);
-		tables.push_back(r);
-		size++;
-	}
-	
-	void createTable(Relation r){ 
-		tables.push_back(r); 
-		size++;
-	}
-	
-	vector<Relation> getRelations(){ return tables; }
-	//void showTable(Relation r){}
-	
-	Relation getTableFromName(string n){
-		//will return first occurence
-		for(int i = 0; i < tables.size(); i++){
-			if (tables[i].getTableName() == n){
-				return tables[i];
-			}
-		}
-	}
-	
-	void saveToFile(vector<string> cmds){ 
-		//writes nothing meaningful
-		ofstream file;
-		file.open("savefile.db");
-		
-		for(int i = 0; i < cmds.size(); ++i){
-			file << cmds[i] << endl;
-		}
-		
-		file.close();
-	}
 };

Relation.cpp

@@ -0,0 +1,44 @@
+#include <iostream>
+#include <vector>
+#include "Relation.h"
+
+Relation::Relation(string n){
+	name = n;
+	size = 0;
+}
+
+Relation::Relation(string n, vector<Attribute> a){ 
+	name = n;
+	att = a;
+	size = a.size();
+}
+
+string Relation::getTableName(){ 
+	return name; 
+}
+
+vector<Attribute> Relation::getAttributes(){ 
+	return att; 
+}
+
+vector<string> Relation::getAttributeNames(){
+	vector<string> temp;
+	for(int i = 0; i < size; ++i){
+		temp.push_back(att[i].getName());
+	}
+	return temp; 
+}
+
+int Relation::getSize(){ 
+	return size; 
+}	
+
+void Relation::display(){
+	cout << "--------------------------\n";
+	cout << name << "\n";
+	for (int i = 0; i < att.size(); ++i){
+		att[i].display();
+	}
+	
+	cout << "--------------------------\n";
+}

Relation.h

@@ -2,53 +2,17 @@
 #include <vector>
 #include "Attribute.h"
 
-//Functional
+class Relation{
-class Relation {
+	string name;
-	string name; //The title the user gives it
+	vector<Attribute> att;
-	vector<Attribute> att; //A vector of the columns
 	int size;
 	
 public:
-	Relation(string n) {
+	Relation(string n);
-		name = n;
+	Relation(string n, vector<Attribute> a);
-		size = 0;
+	string getTableName();
-	}
+	vector<Attribute> getAttributes();
-	Relation(string n, vector<Attribute> a) { 
+	vector<string> getAttributeNames();
-		name = n;
+	int getSize();
-		att = a;
+	void display();
-		size = a.size();
-	}
-	
-	//addAttribute
-	
-	string getTableName() { return name; }
-	vector<Attribute> getAttributes() { return att; }
-	int getSize() { return size; }	
-	
-	//assumes that all attribute titles are unique
-	void projectQuery(string input) {
-		cout << "-----------Initiated Query Projection---------" << endl;
-		for(int i = 0; i < att.size(); i++) {
-			if(att[i].getName() == input) {
-				cout << "Column Title: " << input << endl;
-				for(int j = 0; j < att[i].getSize(); j++) {
-					cout << att[i].getValues()[j] << endl;
-				}
-				
-				break;
-			}
-			else
-				cout << "Attribute input not valid" << endl;
-		}
-	}
-
-	void display() {
-		cout << "--------------------------\n";
-		cout << name << "\n";
-		for (int i = 0; i < att.size(); ++i){
-			att[i].display();
-		}
-		
-		cout << "--------------------------\n";
-	}
 };

test.cpp

@@ -35,4 +35,10 @@ int main() {
 	//vector<Relation> rs = engine.getRelations();
 	Relation r2 = engine.getTableFromName("Food");
 	r2.display();
+	
+	vector<string> v1 = r2.getAttributeNames();
+	
+	for (int i = 0; i < v.size(); ++i){
+		cout << v1[i];
+	}
 }