On Thu, 2002-09-26 at 13:54, Pierre van Rooden wrote:
> Eduard Witteveen wrote:
> > Changed that also... can i check this in under the bugfix?
> Seems more like a HACK to me - you are adding a configuration file to
> read/determine the database based on the driver.
> Sounds good, but please submit this to the list as a Hack, according to
> the rules, with a clear explanation fo what it does.
CALL FOR:
Abstract
========
Autodetection of the mmbase-database-layer to use. When the property
"<property name="database">hsqldb</property>" is not specified in the
file config/module/mmbaseroot.xml, mmbase will select the
mmbase-database-config to use.
This hack i fully backwards compatible.
Working
=======
When the property cannot be found inside the mmbaseroot.xml, a util
class, called DatabaseLookup, will be used.
This class with get the followin information:
-Directory containing all the database-implementation-configs
(config/database/)
-A java.sql.Connection implementation, which will be queried for
jdbc and database information.
-A lookup.xml, which contains filters for
database-implementation-configs.
The DatabaseLookup will look inside the lookup.xml and when it matches a
filter(when multiple, the first will be used), the configuration
specified in this filter will be returned, and used by MMBase.java
Changes
=======
-adding a database-lookup.dtd in config/dtd
-adding a database-lookup.xml in config/database
-adding a DatabaseLookup.java in org/mmbase/util
-changing MMBase.java in org/mmbase/module/core
Benefids
========
I would like to see this changed for the following reasons:
-Plug and Play (when jdbc.xml could be configured also automaticly,
with something like let's say JNDI Resources, nothing has to be
changed to run MMBase on a application-server, only need to define
resources in application-server).
-Fully backwards compatible
-Possiblitly to handle specific jdbc/database combinations(when a
specific combination has known errors)
-It is known which database/jdbc combinations are used in
combination with which mmbase-database-implementation.
Files
=====
Look in email thread
Remarks
=======
Not completely documented, this will be done if it can be checked-in
For more information, please ask
LINKS:
previous email in this thread
START OF CALL: 2002-09-26
END OF CALL: 2002-10-1
[_] +1 (YEA)
[_] +0 (ABSTAIN )
[_] -1 (NAY), because :
[_] VETO, because:
--
Eduard Witteveen Systeem Ontwikkelaar
Publieke Omroep, Gateway C Kamer 101
+31(0)356772910 http://www.omroep.nl/
Sed quis custodiet ipsos custodes? : The sixth Satire from Juvenal
