Read and Modifiying a Table in a File

Hello guys. I Have one file called

"lista"

inside i have:

{
  Nome = "Thales",
  Cidade = "MG",
  Idade = "22",
}
{
  Nome = "Tio Cocota",
  Cidade = "MG",
  Idade = "55",
}

In another program i have:

  local file = fs.open("lista","r")
  local data = file.readAll()
  file.close()
  local a = textutils.unserialize(data)
  print("Nome: "..a.Nome)
  print("Idade: "..a.Idade)
  print("Cidade: "..a.Cidade)

Before when i only have the First table:

{
  Nome = "Thales",
  Cidade = "MG",
  Idade = "22",
}

it worked, but now i have "2 tables" inside the first File, the code gives an error, because i have 2 "Nome", first called "Thales" and the second "Tio cocota"

How can i read the first table separate of the second?
And how can i modify using the another program to modify this values in the file called "lista" ?

Well, the easiest way would be to do this in the file I'd say:

{
   {
	   -- table one contents
   },
   {
	   -- table two contents
   }
}

loading it like you do now, and indexing it like t[1] for the first person, t[2] for the second…

Alternatively, you could use gsub() to replace every } with };, and before trying to unserialize it, add a { and } to the start and finish, making it effectively like the example above but allowing you to store it like you do currently. This should do it:

local function loadstr( str )
	return textutils.unserialize( "{" .. str:gsub( "{", "{;" ) .. "}" )
end

awsumben13, on 31 August 2015 - 11:22 PM said:

Well, the easiest way would be to do this in the file I'd say:

{
   {
	   -- table one contents
   },
   {
	   -- table two contents
   }
}

loading it like you do now, and indexing it like t[1] for the first person, t[2] for the second…

Alternatively, you could use gsub() to replace every } with };, and before trying to unserialize it, add a { and } to the start and finish, making it effectively like the example above but allowing you to store it like you do currently. This should do it:

local function loadstr( str )
	return textutils.unserialize( "{" .. str:gsub( "{", "{;" ) .. "}" )
end

It worked, but i am writing this with this program too, let me show you how am i doing:

				print("Nome:")
  local nome = read()
  print("Idade: ")
  local valor1 = read()
  print("Cidade: ")
  local valor2 = read()
  local table = {
  Nome=nome,
  Idade = valor1,
  Cidade = valor2
  }

  local table2 = textutils.serialize(table)
  local f = fs.open("/lista", "a")
  f.writeLine(table2)
  f.close()

in this way, i dont know how to put the others { }

local person1 = { "test", "table" }
local person2 = { "another", "table" }

local all = {}

table.insert( all, person1 ) --# table.insert automatically puts something into a table at the first free numerical index
table.insert( all, person2 ) 

local f = fs.open("file")
f.write( textutils.serialize(all) )
f.close()

NOTE: DON'T name a variable 'table', that will override the entire table API!

To modify the file, you would first load all the data it already has. Then you would edit the loaded table and save that to the file.