Database Management System In C++ With Source Code

By

angel jude suarez

-

October 19, 2020

1044

Database Management System In C++ With Source Code

The Database Management System In C++ is developed in C++ Programming Language and this Project With Source Code only focused in Student Database Management In C++, This Student Database Management Project In C++ is based on the concept to save and generate all the records of the user especially the students.

A Student Data Management In C++ is considered as a simple database of students in college, you can make it ordered by name or by ID, there are some functions help you to create a database. In this Student Database Management System Mini Project In C++ the user can save data in file after you finish their work, be attention the folder of the program must contain (save.text).

This Lic Database Management System C++ also includes a downloadable Student Database Management System Project In C++ Source Code for free, just find the downloadable source code below and click to start downloading.

Watch the video here to see the full running Database Management System In C++ with Source Code.

To start creating a Database Management System In C++, make sure that you have code blocks or any platform of C/C++ language installed in your computer.

Steps on how to create a Database Management System In C++ With Source Code

Database Management System In C++ With Source Code

Step 1: Create a new project.
First open the code blocks IDE and click “create a new project“.
Step 2: Choose console application.
Second click the “console application” and after that click “next“.
Step 3: Choose C++ language.
Third choose “C++ language” and click “next“.
Step 4: Name Your Project.
Fourth name the project you’ve created and click “next” after that click “finish“.
Step 5: The actual code.
You are free to copy the given source code below or download the downloadable source code given.

The Code Given Below Is The Main Module

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 &lt;&lt; "  Enter your choice: \n";
     num_cases = check_num(3);


     while(  test == 1 )
      {
       switch ( num_cases )
        {
        case 1 :
system("CLS");
                cout &lt;&lt; "You chose 1 to create a database, Please enter the Name, ID and GPA of the student\n";

                getline(cin ,name);
                while ( name&#91;0] &lt; 65 or name&#91;0] > 122)
                 {
                  cout &lt;&lt; "  Wrong input !\n";
                  getline(cin ,name);
                 }

                 getline(cin ,id);

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

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

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

                num_cases = menu();

                break ;

        case 2 :
system("CLS");
               cout &lt;&lt; "  You chose 2 to insert data , Please enter number of students you want to save . \n" ;

               check_insert = 1 ;
               num_insert = check_num(0) ;

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

                   while ( name&#91;0] &lt; 65 or name&#91;0] > 122)
                   {
                   cout &lt;&lt; "  Wrong Name ! \n";
                   getline(cin ,name);
                   }

                   getline(cin ,id);

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

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

                 break;

        case 3 :
system("CLS");
              cout &lt;&lt; "You chose 3 to delete data, Please enter number of students you want to delete  \n";

              check_del = 1 ;
              num_del = check_num(0);

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

                   cout &lt;&lt; "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 &lt;&lt; "You chose 4 to search on data,Please enter number of students you want to search on \n";
               check_search = 1 ;
               num_search = check_num();

               for ( int l = 1 ; l &lt;= num_search ; l++)
               {
                   if ( check_search != 0 )
                   {
                   cout &lt;&lt; " 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 &lt;&lt; "Wrong input ! \n";
            cout &lt;&lt; "Enter your choice: \n";
            num_cases = check_num(3);
            break ;
         }
  }


    return 0;
}

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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 << "You chose 1 to create a database, Please enter the Name, ID 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 2-ID \n";

type = check_num(2);

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

num_cases = menu();

break ;

case 2 :

system("CLS");

cout << " You chose 2 to insert data , Please 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 , Please enter the Name, ID 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 << "You chose 3 to delete data, Please 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 << "You chose 4 to search on data,Please 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;

}

In this module which is the main module of the system.

Complete Source Code

#include &lt;iostream>
#include &lt;fstream>
#include &lt;string>
#include &lt;cctype>
#include &lt;conio.h>
#include &lt;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 &lt;&lt; "  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&#91;0] >= n&#91;0])
            {
                first -> back = new_node ;
                new_node -> next = first ;
                new_node -> back = NULL ;
                first = new_node ;
                counter++ ;
                return 1 ;
            }

           else if ( last -> data.name&#91;0] &lt;= n&#91;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&#91;0] >= n&#91;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 &lt;= 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 &lt;&lt; " 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 &lt;&lt; "Wrong ID \n" ;
            return 3;
          }
        }
        else
        {
            cout &lt;&lt; "Empty database !!\n";
            return 0;
        }
    }

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

         for (  ; pri_ele != NULL ; )
         {
             cout &lt;&lt; pri_ele-> data.name &lt;&lt; "\t" &lt;&lt; pri_ele ->data.no &lt;&lt; "\t" &lt;&lt; pri_ele->data.gpa &lt;&lt; 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 &lt;&lt; "Could not open the file " &lt;&lt; "save.txt" &lt;&lt; endl;
           return 0 ;

          }
         fout &lt;&lt; " Name\t\tID\tGPA\n\n";

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

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

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


   }

   void help ( void )
   {
   	system("CLS");
       cout &lt;&lt; "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"
            &lt;&lt; "Crate Function : \n"
            &lt;&lt; "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"
            &lt;&lt; "Insert/Delete/Search Functions :\n"
            &lt;&lt; "In this function you can insert/delete/search on any number of data , you must use this functions after using create function \n"
            &lt;&lt; "Save Function :\n"
            &lt;&lt; "You can save data in file after you finish your work ,be attention the folder of program must contain (save.text)\n "
            &lt;&lt; "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 &lt;&lt; "  Enter your choice: \n";
     num_cases = check_num(3);


     while(  test == 1 )
      {
       switch ( num_cases )
        {
        case 1 :
system("CLS");
                cout &lt;&lt; "You chose 1 to create a database, Please enter the Name, ID and GPA of the student\n";

                getline(cin ,name);
                while ( name&#91;0] &lt; 65 or name&#91;0] > 122)
                 {
                  cout &lt;&lt; "  Wrong input !\n";
                  getline(cin ,name);
                 }

                 getline(cin ,id);

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

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

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

                num_cases = menu();

                break ;

        case 2 :
system("CLS");
               cout &lt;&lt; "  You chose 2 to insert data , Please enter number of students you want to save . \n" ;

               check_insert = 1 ;
               num_insert = check_num(0) ;

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

                   while ( name&#91;0] &lt; 65 or name&#91;0] > 122)
                   {
                   cout &lt;&lt; "  Wrong Name ! \n";
                   getline(cin ,name);
                   }

                   getline(cin ,id);

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

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

                 break;

        case 3 :
system("CLS");
              cout &lt;&lt; "You chose 3 to delete data, Please enter number of students you want to delete  \n";

              check_del = 1 ;
              num_del = check_num(0);

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

                   cout &lt;&lt; "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 &lt;&lt; "You chose 4 to search on data,Please enter number of students you want to search on \n";
               check_search = 1 ;
               num_search = check_num();

               for ( int l = 1 ; l &lt;= num_search ; l++)
               {
                   if ( check_search != 0 )
                   {
                   cout &lt;&lt; " 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 &lt;&lt; "Wrong input ! \n";
            cout &lt;&lt; "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 &lt;&lt; " 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 &lt;&lt; " Wrong input !\n";
               }
               while ( cin.get() != '\n') continue;
               break ;

       default :

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

      }

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


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


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

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

         int t =  check_num(1);

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

int login ()
{
	//Low Protection Login Code
    /*string userName;
    string userPassword;
    int loginAttempt = 0;

    while (loginAttempt &lt; 5)
    {
        cout &lt;&lt; "\n\tPlease enter your user name: ";
        cin >> userName;
        cout &lt;&lt; "\n\tPlease enter your user password: ";
        cin >> userPassword;
        

        if (userName == "greg" &amp;&amp; userPassword == "pass")
        {
            cout &lt;&lt; "\n\tWelcome Greg!\n";
            //cp nsb
            break;
        }
        else if (userName == "code" &amp;&amp; userPassword == "projects")
        {
            cout &lt;&lt; "\n\tWelcome Admin!\n";
            break;
        }
        else
        {
            cout &lt;&lt; "Invalid login attempt. Please try again.\n" &lt;&lt; '\n';
            loginAttempt++;
        }
    }
    if (loginAttempt == 5)
    {
            cout &lt;&lt; "Too many login attempts! The program will now terminate.";
            return 0;
    }

    cout &lt;&lt; "\n\tThank you for logging in.\n\n";
    system("PAUSE");
    system("CLS"); */
    string pass ="";
   char ch;
   cout &lt;&lt; "\n\n\n\n\t\t\t\t     Database Management System";
   cout &lt;&lt; "\n\n\n\n\n\n\n\t\t\t\t\tEnter Password: ";
   ch = _getch();
   while(ch != 13){//character 13 is enter
      pass.push_back(ch);
      cout &lt;&lt; '*';
      ch = _getch();
   }
   if(pass == "pass"){
      cout &lt;&lt; "\n\n\t\t\t\t\tAccess Granted \n";
   }else{
      cout &lt;&lt; "\n\n\t\t\t\t\tAccess Aborted...Press Any Key To Try Again\n";
      ch = _getch();
      system("CLS");
      login();
   }
   system("PAUSE");
   system("CLS");
}

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#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 << "You chose 1 to create a database, Please enter the Name, ID 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 2-ID \n";

type = check_num(2);

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

num_cases = menu();

break ;

case 2 :

system("CLS");

cout << " You chose 2 to insert data , Please 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 , Please enter the Name, ID 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 << "You chose 3 to delete data, Please 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 << "You chose 4 to search on data,Please 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)

{

login();

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 ;

}

int login ()

{

//Low Protection Login Code

/*string userName;

string userPassword;

int loginAttempt = 0;

while (loginAttempt < 5)

{

cout << "\n\tPlease enter your user name: ";

cin >> userName;

cout << "\n\tPlease enter your user password: ";

cin >> userPassword;

if (userName == "greg" && userPassword == "pass")

{

cout << "\n\tWelcome Greg!\n";

//cp nsb

break;

}

else if (userName == "code" && userPassword == "projects")

{

cout << "\n\tWelcome Admin!\n";

break;

}

else

{

cout << "Invalid login attempt. Please try again.\n" << '\n';

loginAttempt++;

}

}

if (loginAttempt == 5)

{

cout << "Too many login attempts! The program will now terminate.";

return 0;

}

cout << "\n\tThank you for logging in.\n\n";

system("PAUSE");

system("CLS"); */

string pass ="";

char ch;

cout << "\n\n\n\n\t\t\t\t Database Management System";

cout << "\n\n\n\n\n\n\n\t\t\t\t\tEnter Password: ";

ch = _getch();

while(ch != 13){//character 13 is enter

pass.push_back(ch);

cout << '*';

ch = _getch();

}

if(pass == "pass"){

cout << "\n\n\t\t\t\t\tAccess Granted \n";

}else{

cout << "\n\n\t\t\t\t\tAccess Aborted...Press Any Key To Try Again\n";

ch = _getch();

system("CLS");

login();

}

system("PAUSE");

system("CLS");

}

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Downloadable Source Code

Summary

The whole project is designed in ‘C++’ language and different variables and strings have been used for the development of this project. This mini project is easy to operate and understand by the users.

This simple project can enhance the knowledge of the beginners or the students to develop their skills in programming, also this project is easy to understand the module and their variables.

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Inquiries

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