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delete and update work

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This commit is contained in:
Rebecca Schofield 2015-10-05 16:58:07 -05:00
parent 20fec486b6
commit 4515a7073b
4 changed files with 17 additions and 6 deletions
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19
DBEngine.cpp
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@ -286,10 +286,6 @@ Relation DBEngine::crossProduct(Relation r1, Relation r2){
return new_r; return new_r;
} }
//UPDATE Senator
//SET Party = ‘Independent’
//WHERE Name = ‘Joseph Lieberman’
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!!
@ -318,3 +314,18 @@ Relation DBEngine::updateCmd(Relation r, string attNameSet, string attSet, strin
r.setAttributes(atts); r.setAttributes(atts);
return r; return r;
} }
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){
if (r[i][j] == att){
r.removeTuple(j);
}
}
}
}
//r.setAttributes(atts);
return r;
}

2
DBEngine.h
View file

@ -32,5 +32,5 @@ public:
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);
//Relation deleteCmd(); Relation deleteCmd(Relation r, string attName, string att);
}; };

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a.out
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2
test.cpp
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@ -33,6 +33,6 @@ int main () {
v.push_back(att3); v.push_back(att3);
engine.createTable("Food", v); engine.createTable("Food", v);
Relation temp = engine.updateCmd(engine.getTableFromName("Food"), "Dinner", "SUCCESS", "Breakfast", "Pancakes"); Relation temp = engine.deleteCmd(engine.getTableFromName("Food"), "Breakfast", "Pancakes");
temp.display(); temp.display();
} }