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< Advanced Erlang/OTP ~ rdbms with mnesia for running triggers. |
| rkewlani |
 Posted: Wed Sep 10, 2008 2:24 pm |
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Joined: 10 Sep 2008
Posts: 11
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I want to use triggers with mnesia, for this purpose I tried to work with RDBMS(open source erlang library).
so,
I downloaded all the files available on
http://jungerl.cvs.sourceforge.net/jungerl/jungerl/lib/rdbms/src/
All the files are being compiled but I m not able to run it. all files are giving some run time error.
for example when I am running
>trigger_test:test1().
It is giving following error-
Inside the get_activity_state()
** exited: {aborted,{{badmatch,undefined},
[{rdbms,register_action,2},
{trigger_test,'-test1/0-fun-0-',0},
{mnesia_tm,apply_fun,3},
{mnesia_tm,execute_transaction,5},
{mnesia,wrap_trans,6},
{erl_eval,do_apply,5},
{shell,exprs,6},
{shell,eval_loop,3}]}} **
When I tried to catch the problem, I came to know that some “rdbms_activity_state” is undefined.
Can any body help me out to know what is "rdbms_activity_state" & how can I use or set it?
also help me, how can I run code available on above site? |
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| uwiger |
| Posted: Sun Sep 14, 2008 2:58 pm |
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Joined: 03 Jul 2006
Posts: 604
Location: Sweden
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To use rdbms, you need exactly the right version of OTP, to begin with. Some of the changes needed for rdbms have made it into mnesia, but by no means all. Once you've made sure that you have the right version of OTP, you need to also load all the mnesia patches needed by rdbms. It's been a while, but according to the CVS log, the required mnesia version is 4.2.3.
You can load the patches using rdbms:patch_mnesia() |
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| rkewlani |
| Posted: Fri Sep 19, 2008 5:52 am |
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Joined: 10 Sep 2008
Posts: 11
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hi uwiger!
Thanks for reply.
But I am still getting the same problem. Earlier I was running the patches from the mnesia already installed on my system and patches were running fine.But after your reply I downloaded patches from jungerl and tried to run the patches using
rdbms:patch_mnesia().
But now patches are also not running. It is throwing some exception.Please help me out, is there any other way by which rdbms_activity_state can be set. |
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| uwiger |
| Posted: Fri Sep 19, 2008 9:26 am |
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Joined: 03 Jul 2006
Posts: 604
Location: Sweden
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rkewlani wrote: hi uwiger!
Thanks for reply.
But I am still getting the same problem. Earlier I was running the patches from the mnesia already installed on my system and patches were running fine.But after your reply I downloaded patches from jungerl and tried to run the patches using
rdbms:patch_mnesia().
But now patches are also not running. It is throwing some exception.Please help me out, is there any other way by which rdbms_activity_state can be set.
I'll see if I can find some time to look into it. For just running triggers, you don't really need all of rdbms. Triggers can be implemented without any mnesia patches, in fact.
(See e.g. http://www.erlang.org/pipermail/erlang-questions/2005-August/016842.html)
If memory serves, rdbms added an attribute to the mnesia cstruct record, which means that not only do many of the mnesia modules have to be recompiled (that's actually what patch_mnesia() does), but the mnesia schema must also be created with rdbms - or converted, which I don't think I ever got around to. |
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| wuji |
| Posted: Fri Aug 24, 2012 6:31 am |
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Joined: 10 Aug 2012
Posts: 654
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