RE: Discussion Topic #2 Databases

Arg.  Forgot the link.  Thanks :)

Here's the sourceforge link as well:

http://sourceforge.net/projects/daffodildb

> -----Original Message-----
> From: Guijarro, Julio [mailto:[email protected]]
> Sent: Thursday, January 19, 2006 8:39 AM
> To: Hal Hildebrand; Steve Loughran; smartfrog-developer
> Subject: RE: [Smartfrog-developer] Discussion Topic #2 Databases
> 
> Thanks Hal.
> 
> We did not know about that DB and it is LGPL.
> 
> http://www.daffodildb.com/onedollardb-opensource.html
> 
> 
> 
> Julio
> 
> > -----Original Message-----
> > From: smartfrog-developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> [mailto:smartfrog-
> > developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Hal Hildebrand
> > Sent: 19 January 2006 15:53
> > To: Steve Loughran; smartfrog-developer
> > Subject: RE: [Smartfrog-developer] Discussion Topic #2 Databases
> >
> > You might want to check out One$DB - aka daffodil.  This is a full
> > featured, pure Java DB that's also pure JDBC.  Probably one of the
> nicest
> > things in open source I've seen in quite a while (besides SmartFrog,
> of
> > course).
> >
> > -----Original Message-----
> > From: smartfrog-developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> [mailto:smartfrog-
> > developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Steve Loughran
> > Sent: Thursday, January 19, 2006 7:23 AM
> > To: smartfrog-developer
> > Subject: [Smartfrog-developer] Discussion Topic #2 Databases
> >
> >
> > Hello,
> >
> > This is just a note to start some discussion on the mailing list as to
> > what people out there think SmartFrog needs in terms of database
> support
> > in the next year.
> >
> > -We have a MySQL component from the seed project that we are thinking
> of
> > moving in to the SourceForge repository; I don't know what
> > tests/documentation it has. Are there any interested users who could
> > help with those?
> >
> > -for demos and testing, HSQLDB is probably adequate, as it is the
> > simplest of the pure-java datastores. It could have a component to
> > configure it without too much effort.
> >
> > -I haven't looked at Apache Derby at all.
> >
> > I don't want to try and define generic database deployment components,
> > because it only creates the illusion that you can switch database
> > engines on the fly, which everyone knows is even less sensible than
> > switching app servers between installations. But we might benefit from
> > having some components whose aim in life is to create and issue SQL
> > commands against JDBC bindings
> >
> > It would have the following (probably syntactically incorrect)
> components
> >
> > -JdbcBinding to declare a JDBC binding
> > -SqlTransaction for a SQL XA.
> > -SqlLiveness to issue a select against a DB for liveness, failing with
> > an error  or if the result count is more/less than expected, maybe
> even
> > a different value
> >
> > -SqlDeployment to issue different commands/XAs when
> > deploying/undeploying something. So at deploy time you could create a
> > table, and at undeploy time it could be dropped.
> >
> > The JDBC binding would look like this
> >
> > mysql extends JdbcBinding {
> >    classpath "optional-extra-jars";
> >    classname "com.mysql.JdbcDriver";
> >    url TBD;
> >    user TBD;
> >    password TBD;
> >
> >    options  [["name","value"],["name2","value2"]];
> > }
> >
> > With a sql transaction a very thin wrapper around the java.sql API:
> >
> > insert extends SqlTransaction {
> >
> > 	id TBD;
> > 	date TBD;
> > 	text "";
> >
> > 	command "insert into table events values(?,?,?);"
> > 	arguments [id,date,text];
> >
> > }
> >
> > doInsert extends insert {
> > 	db LAZY mysql;
> > 	id "f324";
> >   	date "2006-01-19;
> > 	text "test";
> > }
> >
> > A component to have both deploy and undeploy commands would just be an
> > extension, taking two
> > SqlDeployment  extends Prim {
> > 	db TBD;
> > 	deploy extends SqlTransaction {  .. }
> >
> > 	undeploy extends SqlTransaction {  .. }
> > }
> >
> > The only complication there is that I would not want the nested
> > transactions to bind to anything other than the outer jdbc binding,
> > which is going to be fiddly to make implicit.
> >
> > The liveness would just be a way of defining the health of a database
> if
> > a select operation succeeds with the # of values returned in the
> > expected range, possibly with a list of values that get checked too.
> > That would appear to be the simplest way to do database health checks.
> >
> > Comments?
> >
> > -Steve
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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