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delete working

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This commit is contained in:
Rebecca Schofield 2015-10-06 13:07:31 -05:00
parent 4515a7073b
commit 25ce3c7248
6 changed files with 36 additions and 9 deletions
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12
DBEngine.cpp
View file

@ -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;
}
}
}

3
DBEngine.h
View file

@ -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);
};

16
Relation.cpp
View file

@ -156,4 +156,20 @@ 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);
}
}
}
}
}

2
Relation.h
View file

@ -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);
};

BIN
a.out
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12
test.cpp
View file

@ -1,14 +1,14 @@
#include <iostream>
#include <vector>
#include "Parser.h"
#include "Parser.h"
//#include "Condition.h"
#include "DBEngine.h"
//#include "user.h"
//#include "user.h"
using namespace std;
int main () {
DBEngine engine;
int main () {
DBEngine engine;
Attribute att1("Breakfast", "VARCHAR(20)", true);
Attribute att2("Lunch", "VARCHAR(20)", false);
@ -33,6 +33,6 @@ int main () {
v.push_back(att3);
engine.createTable("Food", v);
Relation temp = engine.deleteCmd(engine.getTableFromName("Food"), "Breakfast", "Pancakes");
temp.display();
engine.deleteCmd("Food", "Breakfast", "Pancakes");
engine.getTableFromName("Food").display();
}