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working on update & delete

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This commit is contained in:
Rebecca Schofield 2015-10-05 15:23:49 -05:00
parent c7c701a169
commit 909df70f2d
2 changed files with 29 additions and 18 deletions
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17
DBEngine.cpp
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@ -290,10 +290,21 @@ Relation DBEngine::crossProduct(Relation r1, Relation r2){
//SET Party = ‘Independent’ //SET Party = ‘Independent’
//WHERE Name = ‘Joseph Lieberman’ //WHERE Name = ‘Joseph Lieberman’
Relation DBEngine::update(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere){ Relation DBEngine::updateCmd(Relation r, string attNameSet, string attSet, string attNameWhere, string attWhere){
Relation temp = equality(attNameWhere, attWhere, r); Relation temp = selection(attNameWhere, attWhere, r);
vector<Attribute> atts = temp.getAttributes();
for (int i = 0; i < atts.size(); ++i){
if (atts[i].getName() == attNameSet) {
for (int j = 0; j < atts[i].getSize(); ++j){
atts[i]setValue(attSet, j);
}
break;
}
}
return r; //currently returns a relation with just the changed values, need to look at proper join
//if proper join does not work, plan B is brute force
return temp;
} }

2
DBEngine.h
View file

@ -31,6 +31,6 @@ 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 update(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();
}; };