82 lines
1.6 KiB
C++
Executable file
82 lines
1.6 KiB
C++
Executable file
#include <iostream>
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#include <vector>
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#include "Attribute.h"
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//Functional
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class Relation {
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//a table with rows and columns
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string name; //the name of the relation (table)
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vector<Attribute> att;
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vector<string> attributeNames;
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int size;
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public:
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//Relation();
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void initializeRelation(string n, vector<string> attNames, vector<Attribute> a) {
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attributeNames = attNames;
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name = n;
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att = a;
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size = 0;
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}
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int getSize() { return size; }
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void addTuple(vector<string> tuple) {
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if(tuple.size() != att.size()){
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cout << "\n ERROR" << endl;
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}
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else {
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//Loop through the attribute columns
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for(int i = 0; i < att.size(); i++) {
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att[i].pushBack(tuple[i]);
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}
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}
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}
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void removeTuple(int tupleNum) {
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if (tupleNum > att[0].getSize() || tupleNum < 0)
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{
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cout<<"ERROR! index out of bound"<<endl;
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}
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else
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{
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for(int i = 0; i < att.size(); ++i) //for all the attributes
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{
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att[i].erase(tupleNum);
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}
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}
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}
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void projectQuery(string input) {
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cout << "-----------Initiated Query Projection---------" << endl;
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for(int i = 0; i < att.size(); i++) {
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if(att[i].getName() == input) {
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cout << "Column Title: " << input << endl;
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for(int j = 0; j < att[i].getSize(); j++) {
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cout << att[i].values[j] << endl;
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}
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break;
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}
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else
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cout << "Attribute input not valid" << endl;
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}
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}
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void display() {
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cout<<"\n\nDisplay of relation--------------------------------"<<endl;
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cout<<"Relation name: "<<name<<endl;
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for (int i = 0; i < attributeNames.size(); ++i)
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{
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cout<<"\nAttribute name: "<<attributeNames[i]<<": ";
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att[i].display();
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}
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}
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};
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