CODEWITHSUNDEEP
erlangmnesia
gextra
gextra

Reputation: 8915

creating mnesia from an erlang module

This should be simple, although I could not find a way or example yet...

The Mnesia documentation shows how to initialize/create an Mnesia database from the erlang shell, which requires to start the erl shell with the -mnesia parameter:

erl -mnesia dir '"/tmp/funky"'

Once in the shell you can create the schema/etc...

>mnesia:create_schema([node()]).
ok.
>mnesia:start().
ok.

Well, that's simple enough. What if I want to create the schema/etc from another erlang module and I did not start the process with the -mnesia parateter/flag ? I think that basically means, how to dynamically, without running a script but from a pure erlang code approach. For instance, I'd like to do something like this:

-module(something).
-export([test/0]).

test() ->
    erlang:setParameter("mnesia","/tmp/funcky"),
    mnesia:create_schema([node()]),
    ...

Upvotes: 0

Views: 229

Answers (1)

gextra
gextra

Reputation: 8915

Well, I think I found the solution. set_env is what I needed:

application:set_env(mnesia, dir, "/tmp/funcky"),
mnesia:create_schema([node()]),
etc...

Upvotes: 1

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