delete working

DBEngine.cpp

@@ -315,7 +315,7 @@ Relation DBEngine::updateCmd(Relation r, string attNameSet, string attSet, strin
 	return r;
 }
 
-Relation DBEngine::deleteCmd(Relation r, string attName, string att){
+/*Relation DBEngine::deleteCmd(Relation r, string attName, string att){
 	for (int i = 0; i < r.getSize(); ++i){
 		if (r[i].getName() == attName){
 			for (int j = 0; j < r[i].getSize(); ++j){
@@ -326,6 +326,14 @@ Relation DBEngine::deleteCmd(Relation r, string attName, string att){
 		}
 	}
 	
-	//r.setAttributes(atts);
 	return r;
+}*/
+
+void DBEngine::deleteCmd(string relationName, string attName, string att){
+	for(int i = 0; i < tables.size(); i++){
+		if (tables[i].getTableName() == relationName){
+			tables[i].deleteCmd(attName, att);
+			return;
+		}
+	}
 }

DBEngine.h

@@ -32,5 +32,6 @@ public:
 	Relation setDiff(Relation r1, Relation r2);
 	Relation crossProduct(Relation r1, Relation r2);
 	Relation updateCmd(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere);
-	Relation deleteCmd(Relation r, string attName, string att);
+	//Relation deleteCmd(Relation r, string attName, string att);
+	void deleteCmd(string relationName, string attName, string att);
 };

Relation.cpp

@@ -157,3 +157,19 @@ void Relation::removeFromTuple(int rindex, int aindex)
 		att[rindex].removeCell(aindex);
 	}
 }
+
+void Relation::updateCmd(){
+	//
+}
+
+void Relation::deleteCmd(string attName, string s){
+	for (int i = 0; i < att.size(); ++i){
+		if (att[i].getName() == attName){
+			for (int j = 0; j < att[i].getSize(); ++j){
+				if (att[i][j] == s){
+					removeTuple(j);
+				}
+			}
+		}
+	}
+}

Relation.h

@@ -28,4 +28,6 @@ public:
 	void insertFromRelation(Relation r);
 	void removeTuple(int index);
 	void removeFromTuple(int rindex, int aindex);
+	void updateCmd();
+	void deleteCmd(string attName, string s);
 };

test.cpp

@@ -33,6 +33,6 @@ int main () {
 	v.push_back(att3);
 	
 	engine.createTable("Food", v);
-	Relation temp = engine.deleteCmd(engine.getTableFromName("Food"), "Breakfast", "Pancakes");
+	engine.deleteCmd("Food", "Breakfast", "Pancakes");
-	temp.display();
+	engine.getTableFromName("Food").display();
 }