User: fleury
Date: 00/11/16 18:11:53
Modified: developers jboss-jaws.html
Log:
jaws updated
Revision Changes Path
1.4 +27 -2 newsite/developers/jboss-jaws.html
Index: jboss-jaws.html
===================================================================
RCS file: /products/cvs/ejboss/newsite/developers/jboss-jaws.html,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- jboss-jaws.html 2000/11/14 06:07:55 1.3
+++ jboss-jaws.html 2000/11/17 02:11:52 1.4
@@ -19,10 +19,35 @@
</tr>
<tr>
<td class="newsbody"><font
face="Arial,Helvetica,sans-serif"><img src="../pictures/jaws.jpg"><br>
- The Minerva JDBC
connection pooling module has been added to the codebase, thanks to Aaron Mulder. This
module complements JAWS by adding a pluggable connection pooling mechanism.</font>
- <p><a
href="../minerva/index.html"><font face="Arial,Helvetica,sans-serif">View the Minerva
JavaDocs</font></a></p>
+ The Minerva JDBC connection pooling module has been added to the
codebase,
+ thanks to Aaron Mulder. This module complements JAWS by adding a
pluggable
+ connection pooling mechanism.
+ <p>During development of jBoss/Server version 1.0 (then known as
EJBoss),
+ our team recognized the need for an object-to-relational (O-R)
mapping
+ tool. Enter JAWS, the acronym for "Just Another Web Storage," an
+ API for mapping Enterprise JavaBeans objects to relational database
+ persistent stores. The jBoss/JAWS project has since taken on a life
+ of its own. That's because we are not only maintaining and enhancing
+ the original code base that defined a simple, yet proprietary O-R
+ mapping tool, we are now also extending the product to support the
+ popular third-party O-R mapping tools being employed by some
jBoss/Server
+ users. That means there's plenty of work to do, so you can join
+ the jBoss/JAWS project and contribute to the coolest O-R mapping
+ open source project around. We encourage you to view the jBoss/JAWS
+ mail archives. </p></font>
+ <p> </p>
+ <p><a href="../minerva/index.html"><font
face="Arial,Helvetica,sans-serif">View
+ the Minerva JavaDocs</font></a></p>
<p><font face="Myriad
Web,Arial">Get a feature list of the project as a whole (under
construction)</font></p>
<p></td>
+ </tr>
+ <tr>
+ <td class="newsheader"><b>What
is O/R Mapping?</b></td>
+ </tr>
+ <tr>
+ <td class="newsbody">O-R
mapping technology grew out of the differences between how object-oriented languages
represent objects in memory and how relational databases store data on disk. Objects
in the Java language might contain only primitive data types such as int, double, and
very simple aggregate objects such as String, making it very easy to express the
object's layout on disk. In the case of storing such a simple object in a flat disk
file, you would just write each primitive data type variable and each String object in
their string form sequentially into the flat file. As you can imagine, reading such
objects back from disk into a memory-based object would be just as easy. However, what
about storing more complex objects such as those that contain other objects that
contain yet other objects? And what about storing both simple and complex objects into
relational databases?<p>
+
+Of course the more complex the object that must be stored to disk, the more
intelligent the O-R mapping tool must be. An O-R mapping tool must understand how to
traverse the complex object's memory graph and figure out how to store it to and read
it from disk. To add to the complexity, the graph of a single object might contain
multiple objects that each reference a single, unique object, and it could also
contain objects that recursively reference themselves or the original object. In these
cases the O-R mapping tool would have to avoid persisting the same object multiple
times, perhaps even ending up in an endless loop because of the self-referencing
composition! On the other hand, all complex Java objects finally boil down to
variables of primitive data types and those of class String. Therefore, while it can
be quite challenging to persist very complex objects, it is not
</tr>
<tr>
<td
class="newsheader"><b>Features</b></td>
