How to create a Global Variable in elixir Module

Question

I have the following code in elixir:

def get_trackerid(imei) do
  client = get_new_client()
  {:ok, result} = :cqerl.run_query(client, "SELECT * FROM trackers_by_imei where imei = \'#{imei}\';")
  row = :cqerl.all_rows(result)
end

Now, now many functions are calling get_trackerid function and everytime the function is called, a call to database is made.

Is there a way to write a function in elixir such the result is stored in a local variable. So, when the next time trackerid for the same imei is requested, I can get the data from the local variable itself.

I think there is no concept of global variable in elixir, so that is not an option, right?

CoderDennis CoderDennis · Accepted Answer · 2016-02-17T19:18:06

You have a few options for saving state within Elixir.

If this method is part of a module that is running a GenServer, then you can use the state parameter to cache values.

You could also use an ets table to cache the values. This would work both inside and outside a GenServer.

How to create a Global Variable in elixir Module

2 Answers