127 lines
2.6 KiB
C++
Executable file
127 lines
2.6 KiB
C++
Executable file
#include "db_engine.h"
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using namespace std;
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db_engine::db_engine(){
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//
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}
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//create a new table in memory
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//creates a vector
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//DONE
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void db_engine::createCmd(string tableName, vector<string> attributes, vector<string> pkeys){
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//creates the proper command and adds it to the cmdList
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//make this better, we need a heterogenous container
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string output = "";
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output += "CREATE TABLE " + tableName + " (";
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vector<string>::iterator it = attributes.begin();
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while (it != attributes.end()){
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if (it == attributes.begin())
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if ((it + 1) != attributes.end())
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output += *it + ",";
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else
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output += *it;
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else
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output+= " " + *it;
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++it;
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}
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output += ") PRIMARY KEY (";
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vector<string>::iterator it2 = pkeys.begin();
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while (it2 != pkeys.end()){
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if (it2 == pkeys.begin())
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if ((it2 + 1) != pkeys.end())
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output += *it2 + ",";
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else
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output += *it2;
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else
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output+= " " + *it2;
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++it2;
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}
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output += ");";
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cmdList.push_back(output);
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}
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//open a txt file, parse SQL script, load data in table
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//void db_engine::openCmd(){
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//
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//}
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//should write cmdList to a .txt file
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//DONE
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void db_engine::saveCmd(){
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ofstream dbCmdFile;
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dbCmdFile.open("dbCmds.txt", ios_base::app);
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vector<string>::iterator it = cmdList.begin();
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while (it != cmdList.end()){
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dbCmdFile << *it << "\n";
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++it;
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}
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cmdList.clear();
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}
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//display the database
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//DONE
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void db_engine::showCmd(string tableName){
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cmdList.push_back("SHOW " + tableName + "");
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}
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//add a tuple to a table in the memory
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//maybe make a table object?
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//BECCA
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void db_engine::insertQuery(string tableName, vector<string> t){
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string output = "INSERT INTO " + tableName + " VALUES FROM (";
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vector<string>::iterator it = t.begin();
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while (it != t.end()){
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if (it == t.begin())
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if ((it + 1) != t.end())
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output += *it + ",";
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else
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output += *it;
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else
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output+= " " + *it;
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++it;
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}
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cmdList.push_back(output + ");");
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}
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//remove a tuple from a table in the memory
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//BECCA
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void db_engine::deleteQuery(){
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//
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}
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//search and return one more tuples from a table in the memory
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//WILLIAM
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void db_engine::selectQuery(){
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//
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}
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//return a subset of attributes (columns)
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//BRANDON
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void db_engine::projectQuery(){
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//
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}
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//each row in the first table is paired with all the rows in the second table
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//BRANDON
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void db_engine::productQuery(){
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//
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}
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//true if relations have the same # of attributes and each attribute must be from the same domain
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//WILLIAM
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bool db_engine::unionComp(){
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return false;
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}
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