Hi Andy,

Before you embark on that, can I ask you to have a look at the current 
org.jboss.mail.store implemenation (the old one will suffice, but it will be 
updated this weekend).  I went through most of the pain of using the MySQL 
emulated locators when I had my very first attempts at implementing the store.  
In fact the Blob[Input/Output]Stream classes were written to solve this very 
problem.

Also MySQL blobs are very buggy, see this thread:

http://www.jboss.org/index.html?module=bb&op=viewtopic&t=59236

Apparently they have fixed Bug 8096, but haven't indicated which release it 
will be in.  Also they suck when it comes to performance.  Try loading a 128MB 
blob in 1MB pieces and watch the MySQL process eat itself (takes around 15 
minutes).  From the work I have done so far it looks like most of the problems 
are not so much with the JDBC driver by the database.  I should really get on 
the mailing list and bitch a little louder about blob support.

Regards,
Mike.

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