| Author |
Message |
< Advanced Erlang/OTP ~ Mnesia : record match tupe/size failure error ? |
| brett hallett |
 Posted: Tue Aug 28, 2007 11:14 pm |
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User
Joined: 21 Aug 2007
Posts: 21
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I'm trying to add some project records into the Mnesia example
database, with some sucess ( with help from this forum  ,
however one record type refuses to accept data, presumably
because there an error !
However I cannot see the reason ! The below code "insertProjects"
compiles an error, I have similar function 'insertManagers' which works OK ?!?
./insertRecs.erl:103: Warning: this clause cannot match because of different types/sizes
This is line 103,
p1=#project{ name= erlang, number=11 },
I understand what the message says but not why it says it !!
I've tried both double a single quotes around 'erlang' and '11' , in various combinations without success,
what am I doing wrong ??
%% ==============================
-record(project, {name,
number}).
%% ==============================
insertProjects() ->
mnesia:start(),
Fun = fun() ->
p1=#project{ name= erlang, number=11 },
mnesia:write(p1),
p2=#project{ name= otp , number=2 },
mnesia:write(p2),
p3=#project{ name= erlang , number= 3 },
mnesia:write(p3),
p4=#project{ name= mnesia , number= 5 },
mnesia:write(p4),
p5=#project{ name= wolf , number= 6 },
mnesia:write(p5),
p6=#project{ name= documentation , number= 7 },
mnesia:write(p6),
p7=#project{ name= cobol , number= 8 },
mnesia:write(p7),
p8=#project{ name= smalltalk , number= 9 },
mnesia:write(p
end,
mnesia:transaction(Fun).
%% ===============================
c{insertRecs).
./insertRecs.erl:103: Warning: this clause cannot match because of different types/sizes
{ok,insertRecs}
15> insertRecs:insertProjects().
{aborted,{{badmatch,{project,erlang,11}},
[{insertRecs,'-insertProjects/0-fun-0-',0},
{mnesia_tm,execute_transaction,5},
{erl_eval,do_apply,5},
{shell,exprs,6},
{shell,eval_loop,3}]}} |
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| michal |
| Posted: Tue Aug 28, 2007 11:42 pm |
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Joined: 20 Jul 2006
Posts: 44
Location: London
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Names of variables in Erlang should start with a capital letter. Use P1, P2, P3, etc.
p1 is an atom and you get a warning because you try to match it with a record. Such a match will always fail.
Michal |
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| brett hallett |
| Posted: Wed Aug 29, 2007 7:45 am |
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Joined: 21 Aug 2007
Posts: 21
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Doh !! As simple as that !! Thanks !!  |
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| anderst |
| Posted: Sun Sep 09, 2007 6:31 pm |
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Joined: 21 Nov 2006
Posts: 37
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Brett, a typical problem with a similar symptom is when you add a field to a record but forget to recompile all of the modules using it. It can appear in Mnesia as well because of its tight connection to records. Those badargs are hard to trace. Totally unrelated to your question, but worth mentioning.
Hilsen,
Anders |
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| wuji |
| Posted: Tue Aug 21, 2012 7:23 am |
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Joined: 10 Aug 2012
Posts: 654
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| trapples |
| Posted: Wed Aug 22, 2012 8:34 am |
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Joined: 02 Apr 2012
Posts: 45
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| Those badargs are hard to trace. Totally unrelated to your question, but worth mentioning |
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