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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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37
DBEngine.cpp
View file

@ -214,15 +214,15 @@ Relation DBEngine::setDiff(Relation r1, Relation r2){
//currently all returned relations are called TEMP //currently all returned relations are called TEMP
Relation new_r = r1; Relation new_r = r1;
new_r.setTableName("TEMP"); new_r.setTableName("TEMP");
vector<string> temp; vector<string> temp;
//bool duplicate = false; //bool duplicate = false;
int size = 0; int size = 0;
for(int x = 0; x < r2.getAttributes().size(); ++x) for(int x = 0; x < r2.getAttributes().size(); ++x)
{ {
for (int i = 0; i < r2.getAttributes()[x].getSize(); ++i) for (int i = 0; i < r2.getAttributes()[x].getSize(); ++i)
{ {
temp = r2.getTuple(i); temp = r2.getTuple(i);
for(int y = 0; y < new_r.getAttributes().size(); ++y) for(int y = 0; y < new_r.getAttributes().size(); ++y)
@ -244,8 +244,8 @@ Relation DBEngine::setDiff(Relation r1, Relation r2){
size = new_r.getAttributes()[y].getSize(); size = new_r.getAttributes()[y].getSize();
} }
} }
} }
} }
return new_r; return new_r;
} }
} }
@ -283,17 +283,28 @@ Relation DBEngine::crossProduct(Relation r1, Relation r2){
} }
return new_r; return new_r;
} }
//UPDATE Senator //UPDATE Senator
//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;
}
}
//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 r; return temp;
} }

10
DBEngine.h
View file

@ -21,16 +21,16 @@ public:
Relation& getTableFromName(string n); Relation& getTableFromName(string n);
void saveToFile(vector<string> cmds); void saveToFile(vector<string> cmds);
Relation selection(string attName, string s, Relation r); Relation selection(string attName, string s, Relation r);
Relation projection(vector<string> input, Relation r); Relation projection(vector<string> input, Relation r);
Relation product(string s1, Relation r1, Relation r2); Relation product(string s1, Relation r1, Relation r2);
void deleteRelation(string n); void deleteRelation(string n);
void save(); void save();
void save(string n); void save(string n);
void storeCommands(string s); void storeCommands(string s);
Relation rename(vector<string> newnames, Relation &r); Relation rename(vector<string> newnames, Relation &r);
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();
}; };