working on crossprodut

DBEngine.cpp

@@ -101,6 +101,7 @@ Relation DBEngine::setUnion(Relation r1, Relation r2){
 	else {
 		//currently all returned relations are called TEMP
 		Relation new_r = r1;
+		new_r.setTableName("TEMP");
 		vector<string> temp;
 		bool duplicate = false;
 
@@ -122,32 +123,76 @@ Relation DBEngine::setUnion(Relation r1, Relation r2){
 		}
 
 		return new_r;
-
-
-
-
-
-		/*vector<Attribute> r1_atts = r1.getAttributes();
-		vector<Attribute> r2_atts = r2.getAttributes();
-		vector<Attribute> new_atts = r1_atts;
-		
-		for (int i = 0; i < r2_atts.size(); ++i) {
-			for (int j = 0; j < r2_atts[i].getSize(); ++j){
-				new_atts[i].addCell(r2_atts[i][j]);
-			}
-		}
-
-		for (int i = 0; i < new_atts.size(); ++i) {
-			for (int j = 0; j < new_atts.size(); ++j){
-				if (new_atts[i] == new_atts[j]){
-					new_atts.erase(new_atts.begin() + i);
-					continue;
-				}
-			}
-		}
-
-		//currently all returned relations are called TEMP
-		Relation new_r("TEMP", new_atts);
-		return new_r;*/
 	}
 }
+
+Relation DBEngine::setDiff(Relation r1, Relation r2){
+	if (r1.getAttributeNames() != r2.getAttributeNames()){
+		cout << "Failure to diff: the relations are not union-compatible.\nreturning the first relation.\n";
+		return r1;
+	}
+
+	else {
+		//currently all returned relations are called TEMP
+		Relation new_r = r1;
+		new_r.setTableName("TEMP");
+		vector<string> temp;
+		bool duplicate = false;
+
+		for (int i = 0; i < r1.getAttributes()[0].getSize(); ++i){
+			new_r.removeTuple(i);
+		}
+
+		for (int i = 0; i < r1.getAttributes()[0].getSize(); ++i) {
+			temp = r1.getTuple(i);
+
+			for (int j = 0; j < r2.getAttributes()[0].getSize(); ++j){
+				if (temp == r2.getTuple(j)){
+					duplicate = true;
+					break;
+				}
+			}
+
+			if (!duplicate){
+				new_r.insertTuple(temp);
+			}
+
+			duplicate = false;
+		}
+
+		//make this one for loop later!
+
+		for (int i = 0; i < r2.getAttributes()[0].getSize(); ++i) {
+			temp = r2.getTuple(i);
+
+			for (int j = 0; j < r1.getAttributes()[0].getSize(); ++j){
+				if (temp == r1.getTuple(j)){
+					duplicate = true;
+					break;
+				}
+			}
+
+			if (!duplicate){
+				new_r.insertTuple(temp);
+			}
+
+			duplicate = false;
+		}
+
+		return new_r;
+	}
+}
+
+Relation DBEngine::crossProduct(Relation r1, Relation r2){
+	vector<Attribute> new_atts = r1.getAttributes();
+	
+	for (int i = 0; i < r2.getAttributes().size(); ++i) {
+		new_atts.push_back(r2.getAttributes()[i]);
+	}
+
+	//currently all returned relations are called TEMP
+	Relation new_r("TEMP", new_atts);
+	
+
+	return new_r;
+}

DBEngine.h

@@ -22,6 +22,6 @@ public:
 	Relation projection(vector<string> input, Relation r);
 	void rename(Relation& r, vector<string> oldnames, vector<string> newnames);
 	Relation setUnion(Relation r1, Relation r2);
-	//void setDiff();
+	Relation setDiff(Relation r1, Relation r2);
-	//void crossProduct();
+	Relation crossProduct(Relation r1, Relation r2);
 };

Relation.cpp

@@ -23,6 +23,10 @@ string Relation::getTableName(){
 	return name; 
 }
 
+void Relation::setTableName(string s){
+	name = s;
+}
+
 Attribute Relation::operator[](int i){ 
 	return att[i]; 
 }

Relation.h

@@ -13,6 +13,7 @@ public:
 	Relation(string n, vector<Attribute> a);
 	void insertAttributes(vector<Attribute> a);
 	string getTableName();
+	void setTableName(string s);
 	Attribute operator[](int i);
 	vector<string> getTuple(int index);
 	vector<Attribute> getAttributes();

test.cpp

@@ -29,26 +29,19 @@ int main() {
 	
 	engine.createTable("Food", v);
 
-	Attribute att4("Breakfast", "VARCHAR(20)", true);
+	Attribute att4("Dessert", "VARCHAR(20)", true);
-	Attribute att5("Lunch", "VARCHAR(20)", false);
+	Attribute att5("Midnight Snack", "VARCHAR(20)", false);
-	Attribute att6("Dinner", "VARCHAR(20)", false);
 	
-	att4.addCell("Pancakes");
+	att4.addCell("Ice Cream Sundae");
-	att4.addCell("Bacon");
+	att4.addCell("Chocolate Bar");
-	att4.addCell("Eggs");
+	att5.addCell("Hummus and Carrots");
-	att5.addCell("Turkey Sandwich");
+	att5.addCell("Potato Chips");
-	att5.addCell("Pasta Salad");
-	att5.addCell("Taco");
-	att6.addCell("Steak");
-	att6.addCell("Fajitas");
-	att6.addCell("Spaghetti");
 	
 	vector<Attribute> v2;
 	v2.push_back(att4);
 	v2.push_back(att5);
-	v2.push_back(att6);
 	
 	engine.createTable("MoarFood", v2);
 
-	engine.setUnion(engine.getTableFromName("Food"), engine.getTableFromName("MoarFood")).display();
+	engine.crossProduct(engine.getTableFromName("Food"), engine.getTableFromName("MoarFood")).display();
 }