Hi James,
Thanks for your swift reply. I tried to follow the tips in
http://docs.codehaus.org/display/ACTIVEMQ/JDBC+Support and
http://activemq.codehaus.org/maven/apidocs/org/apache/activemq/store/jdbc/Statements.html
to enable the persistance tables to be created on MaxDB, and found that with
these data type definition changes, the tables could be created:
<persistenceAdapter>
<journaledJDBC journalLogFiles="5" dataDirectory="../activemq-data"
dataSource="#maxdb-ds">
<statements>
<statements binaryDataType ="LONG BYTE" longDataType ="INTEGER"
stringIdDataType="VARCHAR(250) ASCII"/>
</statements>
</journaledJDBC>
</persistenceAdapter>
MaxDB uses INTEGER for all types of integer numbers and LONG BYTE for a large
binary object. Also, MaxDB only allows a total primary key field length of 1024
bytes per table, so if you try and create the persistance layer in a Unicode
database instance you have to explicitly set the stringIdDataType to ASCII as
above (and it doesn't hurt to do it even if you run an ASCII database instance).
Anyway, now when I try to start the broker, I get all normal-looking INFO
messages in the console window, execpt for these two:
WARN JDBCPersistenceAdapter - Database driver NOT recognized:
[sap_db]. Will use default JDBC implementation.
WARN JDBCPersistenceAdapter - Old message cleanup failed due to:
com.sap.dbtech.jdbc.exceptions.DatabaseException: [-9404]: System error: AK
System error: VAK724 1
The startup then proceeds to state that the message broker has started, but the
second of the above WARN messages then repeat whenever cleanup is attempted.
I am hoping that thses changes cover what needs to be done as regards tweaking
the datatypes. How can I find out what the JDBC connection type name is for the
MaxDB JDBC driver, so that it can be added to ActiveMQ? Also, is there a way to
have the example producer and consumer in http://www.activemq.org/Examples use
persistent storage to test that it actually works with MaxDB (the producer
output says "Using non-durable publishing", so I assume the persistence layer
is never used there)?
Any further insight much appreciated!
/Johan H
-----Original Message-----
From: James Strachan [mailto:[EMAIL PROTECTED]
Sent: Fri 3/24/2006 7:57 AM
To: [email protected]
Subject: Re: Adding support for MaxDB in ActiveMQ JDBC persistence layer
Hi Johan
So mostly we need to work out the flavour of SQL that MaxDB supports
and to figure out what the DDL should look like etc. We have a number
of JDBC adaptors for the various different drives together with how
they handle data types and blobs etc. It could be we just need to
write one for MaxDB.
Also it could be we need to tweak a little the SQL data types we use -
I"ve just added a new section to this page describing how to do
that....
http://docs.codehaus.org/display/ACTIVEMQ/JDBC+Support
Once we basically know the right combination of options that work for
MaxDB, we can add an entry into ActiveMQ so that we auto-discover the
database from the JDBC connection type name and do the right thing.
e.g. here is the current list of auto-discovered configurations of
JDBC, where the file name is the JDBC connection type name returned
from the JDBC driver
http://svn.apache.org/repos/asf/incubator/activemq/trunk/activemq-core/src/main/resources/META-INF/services/org/apache/activemq/store/jdbc/
James
On 3/23/06, Johan Hallgren <[EMAIL PROTECTED]> wrote:
> Hi list,
>
> I am currently in the process of evaluating ActiveMQ. Reading
> http://activemq.org/JDBC+Support I see that it supports quite a lot of
> databases, but unfortunately not the one that my company is using (MaxDB
> (formerly SAPDB), http://www.mysql.com/products/maxdb/). I try to configure
> activemq to use it by copying its JDBC jar file to activemq's lib directory,
> and configuring activemq.xml to use it like this:
>
> <bean id="maxdb-ds" class="org.apache.commons.dbcp.BasicDataSource"
> destroy-method="close">
> <property name="driverClassName" value="com.sap.dbtech.jdbc.DriverSapDB"/>
> <property name="url" value="jdbc:sapdb://localhost/DatabaseInstanceName"/>
> <property name="username" value="activemquser"/>
> <property name="password" value="activemquser"/>
> </bean>
>
> I used the MySQL sample config section as a template and substituted values
> for my MaxDB instance (the class value I used as is, since I didn't know what
> to use there). However, when starting ActiveMQ, I get these errors (I have
> created the database user mentioned above, but not created any tables in that
> schema):
>
[snip]
--
James
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http://radio.weblogs.com/0112098/
