84 lines
1.7 KiB
C++
Executable file
84 lines
1.7 KiB
C++
Executable file
#include <fstream>
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#include <iostream>
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#include <vector>
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#include "DBEngine.h"
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DBEngine::DBEngine(){
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size = 0;
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}
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void DBEngine::createTable(string n){
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Relation r(n);
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tables.push_back(r);
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size++;
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}
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void DBEngine::createTable(string n, vector<Attribute> a){
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Relation r(n, a);
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tables.push_back(r);
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size++;
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}
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void DBEngine::createTable(Relation r){
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tables.push_back(r);
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size++;
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}
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vector<Relation> DBEngine::getRelations(){
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return tables;
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}
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Relation DBEngine::getTableFromName(string n){
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//will return first occurence
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for(int i = 0; i < tables.size(); i++){
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if (tables[i].getTableName() == n){
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return tables[i];
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}
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}
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}
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void DBEngine::saveToFile(vector<string> cmds){
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//writes nothing meaningful
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ofstream file;
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file.open("savefile.db");
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for(int i = 0; i < cmds.size(); ++i){
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file << cmds[i] << endl;
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}
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file.close();
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}
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//assumes that all attribute titles are unique
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Relation DBEngine::projection(vector<string> input, Relation r){
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// for(int i = 0; i < input.size(); i++) {
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// it = find(r.getAttributes().begin(), r.getAttributes().end(), input[i])
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//if(r[i].getName == input[])
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// }
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}
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//ASAP: TEST ALL OF THIS
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void rename(Relation r, vector<string> oldnames, vector<string> newnames){
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if (oldnames.size() != newnames.size()) {
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cout << "Failure to rename: number of attributes do not match.";
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return;
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}
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else if (oldnames != r.getAttributeNames()) {
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cout << "Failure to rename: the attributes to be renamed do not exist in the relation.";
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return;
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}
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else {
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Attribute temp;
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for(int i = 0; i < oldnames.size(); ++i){
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temp = r.getAttributeByName(oldnames[i]);
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temp.setName(newnames[i]);
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}
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}
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}
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