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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4171) Connections to on-disk db go to in-memory db if in-memory db with same name is booted
Date Tue, 21 Apr 2009 12:06:47 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12701142#action_12701142

Kristian Waagan commented on DERBY-4171:

Thanks for looking at the patch, Knut.

I'll look at your suggestions and test them. There are several asserts that might be triggered
by changes to this code.
I guess we should have had a variable like PersistentService.DEFAULT_PROTOCOL, but since we're
not changing it it's not crucial. One use case could be to allow setting the default protocol
to use the in-memory storage factory instead of the directory storage factory. This could
be useful in scenarios where you want to use the in-memory back end for testing, but don't
want to change existing code.

> Connections to on-disk db go to in-memory db if in-memory db with same name is booted
> -------------------------------------------------------------------------------------
>                 Key: DERBY-4171
>                 URL: https://issues.apache.org/jira/browse/DERBY-4171
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>         Attachments: derby-4171-1a-fix.diff
> When an in-memory database has been booted, subsequent attempts to connect to an ordinary
(on-disk) database with the same name as the in-memory database will connect to the in-memory
> ij version 10.5
> ij> connect 'jdbc:derby:memory:MyDB;create=true'; -- with subprotocol memory
> ij> create table t (x varchar(30));
> 0 rows inserted/updated/deleted
> ij> insert into t values 'This is the in-memory backend';
> 1 row inserted/updated/deleted
> ij> connect 'jdbc:derby:MyDB;create=true'; --without subprotocol memory, should create
disk db
> WARNING 01J01: Database 'MyDB' not created, connection made to existing database instead.
> ij(CONNECTION1)> select * from t;
> X                             
> ------------------------------
> This is the in-memory backend 
> 1 row selected

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