73 lines
1.8 KiB
C++
Executable file
73 lines
1.8 KiB
C++
Executable file
#include "DBEngine.h"
|
|
|
|
using namespace std;
|
|
|
|
DBEngine::DBEngine(){
|
|
//
|
|
}
|
|
|
|
//create a new table in memory
|
|
void DBEngine::createCmd(){
|
|
//
|
|
}
|
|
|
|
//open a txt file, parse SQL script, load data in table
|
|
//void DBEngine::openCmd(){
|
|
//
|
|
//}
|
|
|
|
//should write cmdList to a .txt file
|
|
void DBEngine::saveCmd(){
|
|
//
|
|
}
|
|
|
|
//display the database
|
|
void DBEngine::showCmd(){
|
|
//
|
|
}
|
|
|
|
//add a tuple to a table in the memory
|
|
void DBEngine::insertQuery(){
|
|
//
|
|
}
|
|
|
|
//remove a tuple from a table in the memory
|
|
void DBEngine::deleteQuery(){
|
|
//
|
|
}
|
|
|
|
//search and return one more tuples from a table in the memory
|
|
void DBEngine::selectQuery(){
|
|
//
|
|
}
|
|
|
|
//return a subset of attributes (columns)
|
|
/*
|
|
vector<string> DBEngine::projectQuery(Relation table, string query){
|
|
|
|
/*
|
|
So basically this is what's going on:
|
|
- Take the table to iterate through, this is the relation (input 1)
|
|
- Take a string that will be used for the program to search for in the attributes (input 2)
|
|
- Iterate through each attribute until the attribute (string) matches the input query
|
|
- For every iterator, have a counter that counts how many attributes are skipped over in the vector until the attribute is found
|
|
- This counter will be used to iterate through each vector (row) in the list, skip over that many attributes, and push that into a result vector
|
|
- Once all vector's elements at the specified attribute are pushed back, return the result vector
|
|
|
|
|
|
for(int i = 0; i < table.getSize(); i++) {
|
|
|
|
|
|
}
|
|
|
|
}
|
|
*/
|
|
//each row in the first table is paired with all the rows in the second table
|
|
void DBEngine::productQuery(){
|
|
//
|
|
}
|
|
|
|
//true if relations have the same # of attributes and each attribute must be from the same domain
|
|
bool DBEngine::unionComp(){
|
|
return false;
|
|
}
|