[Question]

Hello, Im new to this Fourms, but i'm a big minecraft finatic, on the server i play on i am making a login in system, i have a computer setup like this



[CD]
[CD][CP]


i want the help to code for a database type of this, in the back disk drive will have a floppy called "DataBase". on this floppys will be usernames and passwords.
like this:

User1 = Takedown12
Pass1 = password

in my code i was woundering if it possible to read the variable "User1" from the floppy and compare it to the input on the console, same this with the password, but another big trick is to scan multiple names from the floppy

is this possible???

Yes, but I don't know how. I believe you use tables to do this. I don't know how though, so look at other peoples coding.

Thebinformation could be saved in a CSV style (comma splitten value) you can load it in tables on startup and cyclr through them qhen looking for the login data. This woud be way easier. Cant give code NOW since less time but will be back this evening. Keep waiting ir find someone else to answer

You can make the file like this:
User1: Password1
User2: Password2
…
UserN: PasswordN

And then read it in a table like this:

local function loadUsers()
  local file = fs.open("/disk/database", "r")
  if file then
    local t = {}
    local line = file.readLine()
    while line do
	  local usr, pass = string.match(line, "(.+): (.+)")
	  if usr and pass then
	    t[usr] = pass
	  end
	  line = file.readLine()
    end
    file.close()
    return t
  end
  return nil
end

It returns a table containing the usernames as keys and the passwords as it's values, something like:
t = {
["User1"] = "Password1",
["User2"] = "Password2",
…
["UserN"] = "PasswordN"
}
This is just an example, you might need to change it to work with your system.
I use something like this for my os, but the passwords are saved as a sha256 hash.

Thanks mystic, but although i have coded before in java, im new to lua, could u dumm it down a bit?

Here's some comments explaining the code:

local function loadUsers()
  local file = fs.open("/disk/database", "r") -- open the file for read
  if file then -- check if the file is open
	local t = {} -- create a new table to store the usernames and passwords
	local line = file.readLine() -- read a line from the file
	while line do -- while there's a line
	  local usr, pass = string.match(line, "(.+): (.+)") -- get the username and password
	  if usr and pass then -- if there's a username and password (ie, the line was in the right format)
		t[usr] = pass -- store the username and password in the table
	  end
	  line = file.readLine() -- read the next line from the file
	end
	file.close() -- close the file
	return t -- return the table
  end
  return nil -- an error occurred while opening the file, return nil to indicate error
end

You can then use the function like:

local t = loadUsers()
local usr = read() -- get username
if t[usr] ~= nil then -- check if the user exists
  local pass = read("*") -- get password
  if t[usr] == pass then -- check if the password is correct
    -- username and password correct
  else
    -- wrong password
  end
else
  -- wrong username
end

the first bach of code should that be on the floppy?

No, you need to include a function like that in the login program.
It's just an example, you need to write your own function to do this. But to do it, you need to understand what it does.

can u explain what u gave me is it similar becuase i dont know where to add or what

It's a function, a block of code that can be executed. To call a function use:

<FunctionName>(<arguments>)

The rest of the code is pretty well commented, if you don't understand it, you should read more about lua and programming.

It works, now all i have to do is tweek it

Mystic, just a question how would i distinguish the back disk

I'm not MysticT, but you would use the peripheral API.

i figured it out

My Final Result, Thanks everyone

shell.run("clear")
local function loadUsers()
  local file = fs.open("/disk/database", "r") -- open the file for read
  if file then -- check if the file is open
        local t = {} -- create a new table to store the usernames and passwords
        local line = file.readLine() -- read a line from the file
        while line do -- while there's a line
          local usr, pass = string.match(line, "(.+): (.+)") -- get the username and password
          if usr and pass then -- if there's a username and password (ie, the line was in the right format)
                t[usr] = pass -- store the username and password in the table
          end
          line = file.readLine() -- read the next line from the file
        end
        file.close() -- close the file
        return t -- return the table
  end
  return nil -- an error occurred while opening the file, return nil to indicate error
end

print " Welcome to SRFC"
print " "
print "Booting Login System"
print " "
print " Loading "
textutils.slowPrint ("=====================",8)
print " "
shell.run("Clear")
print "Login Verification Please"
print " "
write("Login: ")


local t = loadUsers()
local usr = read() -- get username
if t[usr] ~= nil then -- check if the user exists
write("Password: ")
local pass = read("*") -- get password
if t[usr] == pass then -- check if the password is correct

print("Please Insert Your ID Card")
print(" ")
print("you have 10 seconds")
sleep(10)

else
-- wrong password
shell.run("clear")
rs.setOutput("bottom",true)
sleep(4)
rs.setOutput("bottom",false)
os.shutdown()
end
elseif usr == "123" then
exit()

else 
shell.run("clear")
rs.setOutput("bottom",true)
sleep(4)
rs.setOutput("bottom",false)
os.shutdown()
 end

pass = "KeyCard"

--KeyCard
print ("Loading ID Card")
textutils.slowPrint ("===============",5)
shell.run("clear")

if peripheral.isPresent("left") == true then
if disk.getLabel("left") == pass then

disk.eject("left")
print ("+++++++++++++++++++++++++++++++")
print ("+Identification Card Confirmed+")
print ("+++++++++++++++++++++++++++++++")

rs.setOutput("top",true)
sleep(12)
rs.setOutput("top",false)
os.shutdown()
end
shell.run("clear")
rs.setOutput("bottom",true)
sleep(4)
rs.setOutput("bottom",false)

os.shutdown()
end