[ http://issues.apache.org/jira/browse/DERBY-393?page=all ]
Trejkaz updated DERBY-393:
--------------------------
Attachment: readonly.patch
This patch creates a new URL sub-scheme "readonlydirectory" which can be used
to load a database from a directory in read-only mode.
It isn't ideal... for one, the URL syntax is a little unwieldy. The syntax is
currently like this:
jdbc:derby:readonlydirectory:C:\Databases\MyDatabase
I would rather the syntax be like this:
jdbc:derby:directory:C:\Databases\MyDatabase;readonly=true
But I couldn't figure out how to do the latter. My patch only contains the
Java 1.4 version of the read-only store. For completeness, I suppose you'd
need a 1.3 and a 1.4 version. Either that or a decorator class which wraps any
other store. I suppose that the decorator approach would make re-use a little
easier.
> Allow multiple JVMs to have read-only access to the same directory-based
> database
> ---------------------------------------------------------------------------------
>
> Key: DERBY-393
> URL: http://issues.apache.org/jira/browse/DERBY-393
> Project: Derby
> Type: New Feature
> Components: Store
> Reporter: Trejkaz
> Attachments: readonly.patch
>
> For an application I'm building, we needed to permit multiple JVMs to access
> the same database.
> We couldn't easily use a network server configuration, as it would be
> difficult to figure out who to connect to since either user might want to
> view the database while the other database is offline.
> We couldn't just dump all the data in a JAR file, as our databases often end
> up being several gigabytes in size.
> So what we really need is a version of the directory store which is treated
> as if it were read-only.
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