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< Erlang Web mailing list ~ [Erlangweb-users] Mnesia schema change, tutorial adding fiel |
| Guest |
 Posted: Sat Dec 05, 2009 4:47 pm |
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Guest
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Hi,
in the shop tutorial from the erlang-web wiki when adding the field
description are we changing the schema on the mnesia db?
When I run in interactive move db_init:init(). I get
db_init module, mnesia's schema already exists, if you want to delete it,
run mnesia:delete_schema/1
do I also lose the data while deleting the schema?
How to just add modifications to an existing mnesia db?
Thanks in advance.
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| Guest |
| Posted: Mon Dec 07, 2009 8:24 am |
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Guest
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Hi,
----- fruity@freaknet.org wrote:
> Hi,
>
> in the shop tutorial from the erlang-web wiki when adding the field
> description are we changing the schema on the mnesia db?
Nope, we are only changing the model's constraints which is not
held in the database, it is just on the framework side. No schema
modifications are needed.
> When I run in interactive move db_init:init(). I get
> db_init module, mnesia's schema already exists, if you want to delete
> it, run mnesia:delete_schema/1
> do I also lose the data while deleting the schema?
Yes, deleting the schema causes also the data loss.
>
> How to just add modifications to an existing mnesia db?
If you would like to change the existing table (SQL-like ALTER TABLE)
you should use mnesia:transform_table/4 function
(http://www.erlang.org/doc/man/mnesia.html#transform_table-4).
>
> Thanks in advance.
>
Kind regards,
--
Michal Ptaszek
www.erlang-consulting.com
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| wuji |
| Posted: Sat Aug 25, 2012 6:45 am |
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