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update being weird

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This commit is contained in:
Rebecca Schofield 2015-10-06 13:16:56 -05:00
parent 25ce3c7248
commit 15185bcb8d
4 changed files with 35 additions and 5 deletions
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11
DBEngine.cpp
View file

@ -286,7 +286,7 @@ Relation DBEngine::crossProduct(Relation r1, Relation r2){
return new_r; return new_r;
} }
Relation DBEngine::updateCmd(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere){ /*Relation DBEngine::updateCmd(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere){
//brute forcing this, sorry universe //brute forcing this, sorry universe
//add error matching!! //add error matching!!
vector<int> inds; vector<int> inds;
@ -313,6 +313,15 @@ Relation DBEngine::updateCmd(Relation r, string attNameSet, string attSet, strin
r.setAttributes(atts); r.setAttributes(atts);
return r; return r;
}*/
void DBEngine::updateCmd(string relationName, string attNameSet, string attSet, string attNameWhere, string attWhere){
for(int i = 0; i < tables.size(); i++){
if (tables[i].getTableName() == relationName){
tables[i].updateCmd(attNameSet, attSet, attNameWhere, attWhere);
return;
}
}
} }
/*Relation DBEngine::deleteCmd(Relation r, string attName, string att){ /*Relation DBEngine::deleteCmd(Relation r, string attName, string att){

3
DBEngine.h
View file

@ -31,7 +31,8 @@ public:
Relation setUnion(Relation r1, Relation r2); Relation setUnion(Relation r1, Relation r2);
Relation setDiff(Relation r1, Relation r2); Relation setDiff(Relation r1, Relation r2);
Relation crossProduct(Relation r1, Relation r2); Relation crossProduct(Relation r1, Relation r2);
Relation updateCmd(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere); //Relation updateCmd(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere);
void updateCmd(string relationName, 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); void deleteCmd(string relationName, string attName, string att);
}; };

24
Relation.cpp
View file

@ -158,8 +158,28 @@ void Relation::removeFromTuple(int rindex, int aindex)
} }
} }
void Relation::updateCmd(){ void Relation::updateCmd(string attNameSet, string attSet, string attNameWhere, string attWhere){
// vector<int> inds;
for (int i = 0; i < att.size(); ++i){
if (att[i].getName() == attNameWhere){
for (int j = 0; j < att[i].getSize(); ++j){
if (att[i][j] == attWhere){
inds.push_back(j);
}
}
}
}
for (int i = 0; i < att.size(); ++i){
if (att[i].getName() == attNameSet){
for (int j = 0; j < inds.size(); ++j){
att[i].setValue(attSet, inds[j]);
}
}
}
return;
} }
void Relation::deleteCmd(string attName, string s){ void Relation::deleteCmd(string attName, string s){

2
test.cpp
View file

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