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| mikl at club-internet.fr |
 Posted: Mon Apr 26, 1999 6:21 am |
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Guest
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Hi,
I am trying to figure out how to make work the RDBMS contrib.
I remplaced the mnesia_schema file with the one in the mnesia 3.6
distribution. I made the change marked as 'UW modif' in the
RDBMS-mnesia_schema.
Everything seems to be ok, then. This change makes me able to create
schema, to create table, etc.
But I did not really understand how to use this module. What about the
sysMnesiaDict database ? Do I have to create it manually ?
The add_properties functions return 'ok', but the operation did not seem
to occur. Where are the properties stored ?
Do you have a comprehensive example on how to use it ?
Thanks in advance for your help.
Mickael Remond
Post generated using Mail2Forum (http://m2f.sourceforge.net) |
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| ulf.wiger at etxb.ericsso |
| Posted: Mon Apr 26, 1999 10:38 am |
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Guest
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Mickael Remond wrote:
>
> Hi,
>
> I am trying to figure out how to make work the RDBMS contrib.
>
> I remplaced the mnesia_schema file with the one in the mnesia 3.6
> distribution. I made the change marked as 'UW modif' in the
> RDBMS-mnesia_schema.
>
> Everything seems to be ok, then. This change makes me able to create
> schema, to create table, etc.
>
> But I did not really understand how to use this module. What about the
> sysMnesiaDict database ? Do I have to create it manually ?
> The add_properties functions return 'ok', but the operation did not seem
> to occur. Where are the properties stored ?
>
Oops! I guess you're referring to the following comment in rdbms.erl?
%%
%% Functions for accessing metadata.
%% -- metadata values are stored in the table 'sysMnesiaDict'
%% which has the structure -record(sysMnesiaDict, {key, value}).
%% where key ::= {Obj_type, Obj, Type}, e.g. {attr, {Table, Attr},
Type},
%% {attr, Attr, Type}, {table, Table, Type}, or {record, Rec, Type}.
%%
Never mind that. It's an old relic.
In the olden days, it wasn't possible to store user-defined properties
in the mnesia schema, so I had my own table. Nowadays, the properties go
into the mnesia schema as 'user_properties'.
You can inspect them by calling mnesia:table_info(Tab, user_properties).
> Do you have a comprehensive example on how to use it ?
Let me get back to you on that. I don't have one quite ready, but
perhaps later this week...
/Uffe
--
Ulf Wiger, Chief Designer AXD 301 <ulf.wiger_at_etxb.ericsson.se>
Ericsson Telecom AB tfn: +46 8 719 81 95
Varuv |
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| ulf.wiger at etxb.ericsso |
| Posted: Tue Apr 27, 1999 12:21 pm |
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Guest
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Mickael Remond wrote:
>
> I have just begin to play with RDBMS and I think this is a great piece
> of code.
Thank you very much. That was nice to hear.
>
> I hope it will be integrated into mnesia distribution, because this tool
> is really adding a lot of new functionnality.
It surely is an interesting test of the mnesia API to try to tack a
full-featured RDBMS on top of it. ;)
/Uffe
--
Ulf Wiger, Chief Designer AXD 301 <ulf.wiger_at_etxb.ericsson.se>
Ericsson Telecom AB tfn: +46 8 719 81 95
Varuv |
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