In Cache studio, when you do Class, Add, New Projection, Java Projection it
creates Java class which corresponds to the Cache class. It imports a bunch
of stuff into that class which allows it to communicate with cache. When you
instantiate the java object, a cache object is created as well. Whatever you
do the to java object happens to the cache object.
Good day,
Douglas
a >From: Richard Schilling <[EMAIL PROTECTED]>
Reply-To: hardhats-members@lists.sourceforge.net
To: hardhats-members@lists.sourceforge.net
Subject: Re: [Hardhats-members] Rewriting CPRS in Java
Date: Wed, 15 Mar 2006 15:44:26 -0800
Awesom! Thanks, Doug.
How do the Java classes interact with their brethren on the MUMPS server?
Or do they?
Richard
Douglas M. PREISER wrote:
Cache Objects are stored in Globals. They are stored as objects, not
tables. The %Save method of the class is used to store the object. We all
know that globals are multi-dimensional so there is no problem storing
complex objects.
The SQL presentation is achieved by generating code when the Cache class
is compiled to handle SQL queries into the database. The SQL queries are
translated into M code which loops through the globals. The table names
default to the class names.
The Caché Java binding takes a class defined in a Caché database and
creates a corresponding Java class from it. This generated class provides
remote access to a Caché class from Java.
The SQL projection is accessable through ODBC. You can link to a Cache
database from, say, SQL Server, and do queries.
Thanks,
Douglas
From: Richard Schilling <[EMAIL PROTECTED]>
Reply-To: hardhats-members@lists.sourceforge.net
To: hardhats-members@lists.sourceforge.net
Subject: Re: [Hardhats-members] Rewriting CPRS in Java
Date: Wed, 15 Mar 2006 11:32:41 -0800
Jim Self wrote:
Richard Schilling wrote:
When objects are stored wholesale in an object store, I call it an
object database. When object data is stored in a SQL database and then
managed by some intermediary API, I call it a persistence layer.
So, perhaps we're splitting hairs here.
Perhaps, but I think you may be misinterpreting the Cache'
documentation. I believe that
your statement that "Cache is obviously storing their data in a SQL data
base" is simply
false.
The defining characteristic of all SQL servers is the presentation of
data by means of a SQL syntax.
The SQL specification doesn't dictate implemenation of the data store.
So, if Cache presents data as SQL structures ... it's a SQL server.
I would hope Cache uses the MUMPS data store for its data.
You seem to be saying that because data is retrievable via SQL it must
be stored in a way
that is ONLY retrievable via SQL. I am not a user of Cache', but I know
that that is not
Not saying that at all. I would hope Cache data is retrievable by MUMPS
as well. It's a testament to the strength of the MUMPS platform.
But there's a point where "another view" of the data is counterproductive
- but then again consider the fact I'm dealing with new development so I
don't have any Cache' dependent code to worry about.
My goal is integration of VistA into cross-platform technologies. Cache
doesn't fit that model very well .... if someone can explain how it can
I'm all ears.
What does it mean when they say that "Cache' classes can be projected as
Java classes"?
I have no idea. Looks like they're jumping on ESI Objects' coat tails.
What are the essential properties of a "true object store" that is not
tied exclusively to
Java?
Generally, the entire class - its methods and members - are persisted in
an object store - not just it's members.
---------------------------------------
Jim Self
Systems Architect, Lead Developer
VMTH Computer Services, UC Davis
(http://www.vmth.ucdavis.edu/us/jaself)
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