union works

Attribute.cpp

@@ -21,6 +21,11 @@ void Attribute::addCell(string v){
 	size++;
 }
 
+void Attribute::removeCell(int index){
+	values.erase(values.begin() + index);
+	size--;
+}
+
 string Attribute::operator[](int i){ 
 	return values[i]; 
 }

Attribute.h

@@ -15,6 +15,7 @@ public:
 	Attribute();
 	Attribute(string n, string t, bool k);
 	void addCell(string v);
+	void removeCell(int index);
 	string operator[](int i);
 	vector<string> getValues();
 	string getName();

DBEngine.cpp

@@ -92,14 +92,42 @@ void DBEngine::rename(Relation& r, vector<string> oldnames, vector<string> newna
 	}
 }
 
-/*Relation DBEngine::setUnion(Relation r1, Relation r2){
+Relation DBEngine::setUnion(Relation r1, Relation r2){
 	if (r1.getAttributeNames() != r2.getAttributeNames()){
-		cout << "Failure to union: the relations are not union-compatible";
-		return;
+		cout << "Failure to union: the relations are not union-compatible.\nreturning the first relation.\n";
+		return r1;
 	}
 
 	else {
-		vector<Attribute> r1_atts = r1.getAttributes();
+		//currently all returned relations are called TEMP
+		Relation new_r = r1;
+		vector<string> temp;
+		bool duplicate = false;
+
+		for (int i = 0; i < r2.getAttributes()[0].getSize(); ++i) {
+			temp = r2.getTuple(i);
+
+			for (int j = 0; j < new_r.getAttributes()[0].getSize(); ++j){
+				if (temp == new_r.getTuple(j)){
+					duplicate = true;
+					break;
+				}
+			}
+
+			if (!duplicate) {
+				new_r.insertTuple(temp);
+			}
+
+			duplicate = false;
+		}
+
+		return new_r;
+
+
+
+
+
+		/*vector<Attribute> r1_atts = r1.getAttributes();
 		vector<Attribute> r2_atts = r2.getAttributes();
 		vector<Attribute> new_atts = r1_atts;
 		
@@ -120,6 +148,6 @@ void DBEngine::rename(Relation& r, vector<string> oldnames, vector<string> newna
 
 		//currently all returned relations are called TEMP
 		Relation new_r("TEMP", new_atts);
-		return new_r;
+		return new_r;*/
 	}
-}*/
+}

DBEngine.h

@@ -21,7 +21,7 @@ public:
 	Relation selection(string attName, string s, Relation r);
 	Relation projection(vector<string> input, Relation r);
 	void rename(Relation& r, vector<string> oldnames, vector<string> newnames);
-	//Relation setUnion(Relation r1, Relation r2);
+	Relation setUnion(Relation r1, Relation r2);
 	//void setDiff();
 	//void crossProduct();
 };

Relation.cpp

@@ -110,3 +110,15 @@ void Relation::insertFromRelation(Relation r){
 		}
 	}
 }
+
+void Relation::removeTuple(int index){
+	if (index >= this->size) {
+		cout << "Failure to delete: the requested index is out of bounds.";
+	}
+	
+	else {
+		for (int i = 0; i < att.size(); ++i) {
+			att[i].removeCell(index);
+		}
+	}
+}

Relation.h

@@ -23,5 +23,5 @@ public:
 	void display();
 	void insertTuple(vector<string> tuple); //assuming they are in order
 	void insertFromRelation(Relation r);
-	//void removeTuple();
+	void removeTuple(int index);
 };

test.cpp

@@ -29,9 +29,9 @@ int main() {
 	
 	engine.createTable("Food", v);
 
-	Attribute att4("SecondBreakfast", "VARCHAR(20)", true);
-	Attribute att5("SecondLunch", "VARCHAR(20)", false);
-	Attribute att6("SecondDinner", "VARCHAR(20)", false);
+	Attribute att4("Breakfast", "VARCHAR(20)", true);
+	Attribute att5("Lunch", "VARCHAR(20)", false);
+	Attribute att6("Dinner", "VARCHAR(20)", false);
 	
 	att4.addCell("Pancakes");
 	att4.addCell("Bacon");
@@ -50,5 +50,5 @@ int main() {
 	
 	engine.createTable("MoarFood", v2);
 
-	//engine.setUnion(engine.getTableFromName("Food"), engine.getTableFromName("MoarFood")).display();
+	engine.setUnion(engine.getTableFromName("Food"), engine.getTableFromName("MoarFood")).display();
 }