Database Management system Projects in C++

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------------------ START --------------

// Write a Program in which Student Database Creation

#include <iostream>
#include <fstream>
#include <string>
#include <cctype>
#include <conio.h>
#include <stdlib.h>

using namespace std;

struct id
{
string name;
string no ;
int gpa ;
};

struct node
{
id data ;
node * next ;
node * back ;
};

class SDB{
private :
node * first , *last , *new_node ;
long int type ;
int counter ; int flag = 0 ;
public:

SDB(){first = last = NULL ; int counter = 1; }

int Construct ( long int i ,string n ,string x , long double y )
{
if ( first == NULL)
{
type = i ;
new_node = new node ;
new_node -> data.name = n;
new_node -> data.no = x ;
new_node -> data.gpa = y ;
new_node -> next = NULL;
new_node -> back = NULL;
first = new_node ;
last = new_node ;
counter++ ;
return 1 ;
}
else
{
cout << " You used create option previously \n " ;
return 0 ;
}
}

int insertelement ( string n , string x , long double y )
{

new_node = new node ;
new_node -> data.name = n;
new_node -> data.no = x ;
new_node -> data.gpa = y ;

if( first != NULL)
{

switch ( type )
{
case 1 :

if ( first -> data.name[0] >= n[0])
{
first -> back = new_node ;
new_node -> next = first ;
new_node -> back = NULL ;
first = new_node ;
counter++ ;
return 1 ;
}

else if ( last -> data.name[0] <= n[0] )
{
last -> next = new_node ;
new_node -> next = NULL ;
new_node -> back = last ;
last = new_node ;
counter++ ;
return 1 ;
}
else
{
node * current = first ;
node * cur_next = current-> next ;

for ( ; cur_next -> next != NULL ; )
{
current = current -> next ;
cur_next = cur_next ->next ;

if( cur_next -> data.name[0] >= n[0])
break ;
}

cur_next -> back = new_node ;
new_node -> next = cur_next ;
new_node -> back = current ;
current -> next = new_node ;
counter++ ;
return 1 ;

}
break ;

case 2 :

if ( first -> data.no >= x)
{
first -> back = new_node ;
new_node -> next = first ;
new_node -> back = NULL ;
first = new_node ;
counter++ ;
return 1 ;
}

else if ( last -> data.no <= x )
{
last -> next = new_node ;
new_node -> next = NULL ;
new_node -> back = last ;
last = new_node ;
counter++ ;
return 1 ;
}
else
{
node * current = first ;
node * cur_next = current-> next ;

for ( ; cur_next -> next != NULL ; )
{
current = current -> next ;
cur_next = cur_next ->next ;

if( cur_next -> data.no >= x)
break ;
}

cur_next -> back = new_node ;
new_node -> next = cur_next ;
new_node -> back = current ;
current -> next = new_node ;
counter++ ;
return 1 ;
}
break ;

}
}
else
{
cout << " Please use create option first \n";
return 0 ;
}
}

int deleteelement (string x )
{
if ( first != NULL)
{
node * del_first = first ;
node * del_last = last;
node * del_next = del_first -> next ;
node * del_back = last -> back ;

if ( first -> data.no == x )
{
first = del_next ;
delete (del_first);
counter-- ;
return 1;
}

else if ( last -> data.no == x)
{
last = del_back;
last -> next = NULL ;
delete (del_last);
counter-- ;
return 1;
}
else
{

for ( ; del_first ->next != NULL ; )
{
del_first = del_first -> next ;
del_back = del_first -> back ;
del_next = del_first -> next ;

if ( x == del_first -> data.no)
{
del_next -> back = del_first ->back ;
del_back -> next = del_first ->next;
delete (del_first);
flag = 1 ;
counter-- ;
return 1;
}
}
}

if ( flag == 0 ) {
cout << "Wrong ID \n" ;
return 3;
}
}
else
{
cout << "Empty database !!\n";
return 0;
}
}

void print ( void )
{
cout << " Name\t\tID\tGPA\n\n";
node* pri_ele = first ;

for ( ; pri_ele != NULL ; )
{
cout << pri_ele-> data.name << "\t" << pri_ele ->data.no << "\t" << pri_ele->data.gpa << endl ;
pri_ele = pri_ele-> next ;
}
}

int savefile ( void )
{
node *save = first ;
int fs = 0 ;
ofstream fout("save.txt") ;

if (!fout.is_open()) // failed to open file
{
cout << "Could not open the file " << "save.txt" << endl;
return 0 ;

}
fout << " Name\t\tID\tGPA\n\n";

for ( ; save != NULL ; )
{
fout << save-> data.name << "\t" << save ->data.no << "\t" << save ->data.gpa << endl ;
save = save-> next ;
fs = 1 ;
}
fout.close();
if (fs == 0)
{
cout << "Empty database !! \n";
return 0 ;
}
else
{
cout << "Done \n";
return 1 ;
}
}

int searchelement ( string x)
{
node* sch = first ;
int f = 0;

if ( first == NULL )
{
cout << "Empty Database \n";
return 0 ;
}
else
{
while ( sch != NULL)
{
if( sch -> data.no == x )
{
cout <<sch -> data.name << "\t" << sch -> data.no << "\t" << sch -> data.gpa << endl ;
f = 1;
return 1;
break ;
}
sch = sch ->next;
}
if (f == 0)
{
cout << "Wrong ID \n" ;
return 3;
}
}

}

void help ( void )
{
system("CLS");
cout << "This program considered as simple database of students in collage , you can make it ordered by name or by ID , there are some functions help you to create a database : \n"
<< "Crate Function : \n"
<< "You must use this is function at first to create database ,in this function you must enter type of order ( name or ID ) , if you want to insert another data you can use insert function \n"
<< "Insert/Delete/Search Functions :\n"
<< "In this function you can insert/delete/search on any number of data , you must use this functions after using create function \n"
<< "Save Function :\n"
<< "You can save data in file after you finish your work ,be attention the folder of program must contain (save.text)\n "
<< "Thanks for reading \n" ;
}

};

void show (void) ;
int check_num(int x = 0);
int menu ();

int main()
{
show();
SDB obj ;
long int type , test , num_cases ;
long int num_insert , num_del ,num_search ,check_insert , check_del ,check_search ;
long double gpa;
string name , id ;

test = 1;

cout << " Enter your choice: \n";
num_cases = check_num(3);

while( test == 1 )
{
switch ( num_cases )
{
case 1 :
system("CLS");
cout << "\nYou chose 1 to create a database \nPlease enter the Name \nID and GPA of the student\n";

getline(cin ,name);
while ( name[0] < 65 or name[0] > 122)
{
cout << " Wrong input !\n";
getline(cin ,name);
}

getline(cin ,id);

while ( !(cin >> gpa) or gpa > 4)
{
cin.clear();
while ( cin.get() != '\n') continue;
cout << " Wrong input !\n";
}
while ( cin.get() != '\n') continue;

cout << " What type of database arrangement you want ? \n "
<< " 1-Name \n2-ID \n";
type = check_num(2);

obj.Construct(type , name , id , gpa);

num_cases = menu();

break ;

case 2 :
system("CLS");
cout << " \nYou chose 2 to insert data \nPlease enter number of students you want to save . \n" ;

check_insert = 1 ;
num_insert = check_num(0) ;

for ( int j = 1 ; j <= num_insert ; j++)
{
if ( check_insert == 1)
{
cout << " Please enter name of student \nPlease enter the Name \nID and GPA of the student\n";
getline(cin ,name);

while ( name[0] < 65 or name[0] > 122)
{
cout << " Wrong Name ! \n";
getline(cin ,name);
}

getline(cin ,id);

while ( !(cin >> gpa) or gpa > 4)
{
cin.clear();
while ( cin.get() != '\n') continue;
cout << " Wrong input !\n";
}
while ( cin.get() != '\n') continue;

check_insert = obj.insertelement(name , id , gpa);
}
}
num_cases = menu();

break;

case 3 :
system("CLS");
cout << "\nYou chose 3 to delete data \nPlease enter number of students you want to delete \n";

check_del = 1 ;
num_del = check_num(0);

for ( int k = 1 ; k <= num_del ; k++)
{
if ( check_del != 0)
{

cout << "Please enter ID of student \n";
getline(cin , id);
check_del = obj.deleteelement(id);
if ( check_del == 3) k-- ;
}
}

num_cases = menu();

break;

case 4 :
system("CLS");
cout << "\nYou chose 4 to search on data \nPlease enter number of students you want to search on \n";
check_search = 1 ;
num_search = check_num();

for ( int l = 1 ; l <= num_search ; l++)
{
if ( check_search != 0 )
{
cout << " Please enter ID of student \n";
getline(cin , id);
check_search = obj.searchelement(id);
if ( check_search == 3) l--;
}
}

num_cases = menu();
break;

case 5 :
system("CLS");
obj.print() ;
num_cases = menu();
break ;

case 6 :
system("CLS");
int save_cheak ;
save_cheak =obj.savefile();
num_cases = menu();

break ;

case 7 :

obj.help();
num_cases = menu();
break ;

case 8 :

exit(EXIT_SUCCESS);
break ;

default :

cout << "Wrong input ! \n";
cout << "Enter your choice: \n";
num_cases = check_num(3);
break ;
}
}

return 0;
}

int check_num(int x )
{
int num ;

switch ( x )
{

case 1 :
case 2 :

while ( !(cin >> num) or num > 2)
{
cin.clear();
while ( cin.get() != '\n') continue;
cout << " Wrong input !\n";
}
while ( cin.get() != '\n') continue;
break ;
case 3 :
while ( !(cin >> num) or num > 8)
{
cin.clear();
while ( cin.get() != '\n') continue;
cout << " Wrong input !\n";
}
while ( cin.get() != '\n') continue;
break ;

default :

while ( !(cin >> num) )
{
cin.clear();
while ( cin.get() != '\n') continue;
cout << " Wrong input !\n";
}
while ( cin.get() != '\n') continue;
break ;

}

return num ;
}
int login();
void show (void)
{

cout <<"\n\t ------WELCOME TO DATABASE MANAGEMENT SYSTEM------ \n\n";

cout << "********************************************************************************\n"
<< "********************************************************************************\n"
<< "*** 1- Create Database ***\n"
<< "*** 2- Insert Data ***\n"
<< "*** 3- Delete Data ***\n"
<< "*** 4- Search on Data ***\n"
<< "*** 5- Print Data ***\n"
<< "*** 6- Save ***\n"
<< "*** 7- Help ***\n"
<< "*** 8- Exit ***\n"
<< "********************************************************************************\n"
<< "********************************************************************************\n";
}

int menu()
{
int num_cases;
cout << " Do you want to do another operation?\n "
<< " 1- Yes 2-No \n";

int t = check_num(1);

if ( t == 1)
{
system("cls");
show();
cout << "Enter your choice: \n";
num_cases = check_num(3);
return num_cases;
}
else
return 8 ;
}

--------------- END ----------------

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