NDBMS

This is a very simple database management systemn. You can create your own database file, add data to it, search data and can list data from database. It certainly has limitations and some corner cases which are not handled. Full documentation is given at github.com/Raihan-28011/NDBMS

Commands Syntax

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Command	Structure	Sub Commands
create	create [FILE]	insert, list, save, help, exit
load	load [FILE]	add, list, search, help, exit
help	help	no subcommands
exit	exit	no subcommands

Commands Usage

---

1. Create

Syntax: create filename

ndbms> create data.db
Creating 'data.db'...
ndbms~create>

Sub Commands

• insert
  • Syntax: insert name, phone, email

   ndbms~create> insert Fahmid Ahmed, 01234567891, fahmid365@gmail.com
   ____________________________________________________________________
   | Entry ID |      Name        |    Phone    |  	   Email    |
   |__________|__________________|_____________|______________________|
   |     1    |   Fahmid Ahmed   | 01234567891 | fahmid365@gmail.com  |
   |__________|__________________|_____________|______________________|
   ndbms~create>

• list
  • Syntax: list

   ndbms~create> list
   ____________________________________________________________________
   | Entry ID |      Name        |    Phone    |  	   Email    |
   |__________|__________________|_____________|______________________|
   |     1    |   Fahmid Ahmed   | 01234567891 | fahmid365@gmail.com  |
   |__________|__________________|_____________|______________________|
   ndbms~create>

• save
  • Syntax: save

   ndbms~create> save
   All data has been successfully saved to file 'text.db'
   Exiting create mode...
   ndbms>

• help
  • Syntax: help

   ndbms~create> help
   usage: ndbms~create> command [ARGUMENTS]...
   commands:
     insert [NAME], [PHONE], [EMAIL]      insert command accepts three comma seperated
                                          arguments (name, phone and email)
     save                                 saves the inserted data into the frovided file with
                                          create command
     list                                 lists the inserted data
     help                                 shows this message
     exit                                 exit from create mode, shows warning if inserted
                                          data was not saved by the user
   ndbms~create>

• exit
  • Syntax: exit

   ndbms~create> exit
   Exiting create mode...
   ndbms>

2. load

Syntax: load filename

ndbms> load data.db
Loading data.db...
ndbms~load>

Sub Commands

• list
  • Syntax: list

   ndbms~load> list
   _____________________________________________________________________
   | Entry ID |      Name        |    Phone    |  	     Email   |
   |__________|__________________|_____________|_______________________|
   |     1    |   Fahmid Ahmed   | 01234567891 | fahmid365@gmail.com   |
   |__________|__________________|_____________|_______________________|
   |     2    |   Shimul Islam   | 01234567891 | shimulislam@yahoo.com |
   |__________|__________________|_____________|_______________________|
   ndbms~load>

• add
  • Syntax: add name, phone, email

   ndbms~load> add Saqlain Mustak, 01234556455, saqlainmustak@gmail.com
   ________________________________________________________________________
   | Entry ID |      Name        |    Phone    |  	       Email    |
   |__________|__________________|_____________|__________________________|
   |     3    |  Saqlain Mustak  | 01234556455 | saqlainmustak@gmail.com  |
   |__________|__________________|_____________|__________________________|
   ndbms~load>

• search
  • Syntax: search fieldname data

   ndbms~load> search ID 3
   ________________________________________________________________________
   | Entry ID |      Name        |    Phone    |  	       Email    |
   |__________|__________________|_____________|__________________________|
   |     3    |  Saqlain Mustak  | 01234556455 | saqlainmustak@gmail.com  |
   |__________|__________________|_____________|__________________________|
   ndbms~load>

• help
  • Syntax: help

   ndbms~load> help
   usage: ndbms~load> command [option]...
   command:
     list                             lists all data from the file provided
   				    with load command
     add [NAME], [PHONE], [EMAIL]     adds new data to the database file
     search [FIELD] [DATA]            search [DATA] by [FIELD] which are name,
   				    phone and email
     help                             shows this message
     exit                             exits from load mode
   ndbms~load>

• exit
  • Syntax: exit

   ndbms~load> exit
   All data has been successfully saved to file 'data.db'
   Exiting load mode...
   ndbms>

3. help

Syntax: help

ndbms> help
usage: ndbms> command [FILE]
command:
  create [FILE]        creates a database file named [FILE]
  load [FILE]          loads a database file named [FILE]
  help                 shows this message
  exit                 exits from ndbms
ndbms>

4. exit

Syntax: exit

ndbms> exit
Exiting...

Limitations

• User can create same file twice.
• Name and email has to be between 1 and 39 characters. And phone has to be between 1 and 19 characters.
• Commands have to be between 1 and 6 characters.
• No checks for tabs or multiple spaces. You can make the program misbehave with tabs and multiple spaces.
• 'remove' operation is still not added.
• If user doesn't use the 'save' command, database will not be saved and file will not be created.
• Now, we can only search data by 'ID'. I didn't add search by name, phone or email operations yet.
• some other corner cases were also not handled.