80 lines
1.7 KiB
C++
Executable file
80 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 "Relation.h"
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//still in progress
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class DBEngine {
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vector<Relation> tables;
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int size;
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public:
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DBEngine(){
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size = 0;
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}
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void 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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}
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void createTable(Relation r) { tables.push_back(r); }
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vector<Relation> getRelations() { return tables; }
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void showTable(Relation r) { r.display(); }
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Relation 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 saveToFile(vector<string> cmds) {
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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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//void insertTuple(Relation r, vector<string> t) { r.addTuple(t); }
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//need to add find by name
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/*void deleteTuple(Relation r, int n) {
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cout << "a";
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r.removeTuple(n); }*/
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void selectTuples() {
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//
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}
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void project(Relation r, string n) { r.projectQuery(n); }
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/*
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Relation product(string p_name, Relation table_1, Relation table_2) {
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vector<Attribute> all_att;
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//Insert table 1 attributes
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all_att.insert(all_att.begin(), (table_1.getAttributes()).begin(), (table_1.getAttributes()).end());
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//Insert table 2 attributes
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all_att.insert(all_att.begin(), (table_2.getAttributes()).begin(), (table_2.getAttributes()).end());
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Relation temp(p_name, all_att);
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vector<string> table1_stuff;
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return temp;
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}
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*/
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bool unionComp(Relation r1, Relation r2) {
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return ((r1.getSize() == r2.getSize()) && (r1.getDomains() == r2.getDomains()));
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}
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};
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