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        <LI><A HREF="#name">NAME</A></LI>
        <LI><A HREF="#synopsis">SYNOPSIS</A></LI>
        <UL>

                <LI><A HREF="#note">NOTE</A></LI>
        </UL>

        <LI><A HREF="#requirements">REQUIREMENTS</A></LI>
        <LI><A HREF="#description">DESCRIPTION</A></LI>
        <LI><A HREF="#authors / copyright">AUTHORS / COPYRIGHT</A></LI>
        <LI><A HREF="#acknowledgements">ACKNOWLEDGEMENTS</A></LI>
        <LI><A HREF="#support / warranty">SUPPORT / WARRANTY</A></LI>
        <LI><A HREF="#todo">TODO</A></LI>
        <UL>

                <LI><A HREF="#handle the following errors/cases:">Handle the following errors/cases:</A></LI>
                <UL>

                        <LI><A HREF="#dbierror [tangram]: dbd::mysql::st execute failed: unknown column 't1.requestdump' in 'field list'">``DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'''</A></LI>
                        <LI><A HREF="#compare schema (structure diff) with database ...">Compare schema (structure diff) with database ...</A></LI>
                </UL>

                <LI><A HREF="#introduce some features:">Introduce some features:</A></LI>
                <UL>

                        <LI><A HREF="#links:">Links:</A></LI>
                </UL>

        </UL>

</UL>
<!-- INDEX END -->

<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way</P>
<P>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
  ... the basic way:</PRE>
<PRE>
  ... via inheritance:
</PRE>
<PRE>

    use Data::Storage;
    my $proxyObj = new HttpProxy;
    $proxyObj-&gt;{url} = $url;
    $proxyObj-&gt;{payload} = $content;
    $self-&gt;{storage}-&gt;insert($proxyObj);</PRE>
<PRE>

    use Data::Storage;
    my $proxyObj = HttpProxy-&gt;new(
      url =&gt; $url,
      payload =&gt; $content,
    );
    $self-&gt;{storage}-&gt;insert($proxyObj);</PRE>
<P>
<H2><A NAME="note">NOTE</A></H2>
<P>This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks. 
Please look at their documentation and/or this code for additional information.</P>
<P>
<HR>
<H1><A NAME="requirements">REQUIREMENTS</A></H1>
<P>For full functionality:
  DBI              from CPAN
  Tangram          from CPAN
  Class::Tangram   from CPAN
  MySQL::Diff      from <A HREF="http://adamspiers.org/computing/mysqldiff/">http://adamspiers.org/computing/mysqldiff/</A>
  ... and all their dependencies</P>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>Data::Storage is module for a accessing various ``data structures'' stored inside
various ``data containers''. It sits on top of DBI and/or Tangram.</P>
<P>
<HR>
<H1><A NAME="authors / copyright">AUTHORS / COPYRIGHT</A></H1>
<P>The Data::Storage module is Copyright (c) 2002 Andreas Motl.
All rights reserved.</P>
<P>You may distribute it under the terms of either the GNU General Public
License or the Artistic License, as specified in the Perl README file.</P>
<P>
<HR>
<H1><A NAME="acknowledgements">ACKNOWLEDGEMENTS</A></H1>
<P>Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object, 
Sam Vilain for Class::Tangram, Adam Spiers for MySQL::Diff and all contributors.</P>
<P>
<HR>
<H1><A NAME="support / warranty">SUPPORT / WARRANTY</A></H1>
<P>Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.</P>
<P>
<HR>
<H1><A NAME="todo">TODO</A></H1>
<P>
<H2><A NAME="handle the following errors/cases:">Handle the following errors/cases:</A></H2>
<P>
<H3><A NAME="dbierror [tangram]: dbd::mysql::st execute failed: unknown column 't1.requestdump' in 'field list'">``DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'''</A></H3>
<PRE>
    ... occours when operating on object-attributes not introduced yet:
    this should be detected and appended/replaced through:
    &quot;Schema-Error detected, maybe (just) an inconsistency. 
    Please check if your declaration in schema-module &quot;a&quot; matches structure in database &quot;b&quot; or try to run&quot;
    db_setup.pl --dbkey=import --action=deploy</PRE>
<P>
<H3><A NAME="compare schema (structure diff) with database ...">Compare schema (structure diff) with database ...</A></H3>
<PRE>
  ... when issuing &quot;db_setup.pl --dbkey=import --action=deploy&quot;
  on a database with an already deployed schema, use an additional &quot;--update&quot; then
  to lift the schema inside the database to the current declared schema.
  You will have to approve removals and changes on field-level while
  new objects and new fields are introduced silently without any interaction needed.
  In future versions there may be additional options to control silent processing of
  removals and changes.
  See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas,
  don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself.
  Classes:
    C create    -&gt;  yes, handled automatically
    R retrieve  -&gt;  no, not subject of this aspect since it is about deployment only
    U update    -&gt;  yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here)
    D delete    -&gt;  yes, just by user-interaction
  Class variables:
    C create    -&gt;  yes, handled automatically
    R retrieve  -&gt;  no, not subject of this aspect since it is about deployment only
    U update    -&gt;  yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost
    D delete    -&gt;  yes, just by user-interaction
</PRE>
<PRE>

  It's all about not to be able to loose data simply while this is in pre-alpha stage.
  And loosing data by being able to modify and redeploy schemas easily is definitely quite easy.</PRE>
<PRE>

  As we can see, creations of Classes and new Class variables is handled 
  automatically and this is believed to be the most common case under normal circumstances.</PRE>
<P>
<H2><A NAME="introduce some features:">Introduce some features:</A></H2>
<PRE>
  - Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.
  - Make it possible to load/save schemas in XMI (XML Metadata Interchange), 
    which seems to be most commonly used today, perhaps handle objects with OIFML.
    Integrate/bundle this with a web-/html-based UML modeling tool or 
    some other interesting stuff like the &quot;Co-operative UML Editor&quot; from Uni Darmstadt. (web-/java-based)
  - Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers.
  - Add some more handlers:
    - look at DBD::CSV, Text::CSV, XML::CSV, XML::Excel
  - Add some more locations/locators:
    - PerlDAV: <A HREF="http://www.webdav.org/perldav/">http://www.webdav.org/perldav/</A>
  - Move to t3, use InCASE</PRE>
<P>
<H3><A NAME="links:">Links:</A></H3>
<PRE>
  Specs:
    UML 1.3 Spec: <A HREF="http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf">http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf</A>
    XMI 1.1 Spec: <A HREF="http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf">http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf</A>
    XMI 2.0 Spec: <A HREF="http://cgi.omg.org/docs/ad/01-06-12.pdf">http://cgi.omg.org/docs/ad/01-06-12.pdf</A>
    ODMG: <A HREF="http://odmg.org/">http://odmg.org/</A>
    OIFML: <A HREF="http://odmg.org/library/readingroom/oifml.pdf">http://odmg.org/library/readingroom/oifml.pdf</A></PRE>
<PRE>
  CASE Tools:
    Rational Rose (commercial): <A HREF="http://www.rational.com/products/rose/">http://www.rational.com/products/rose/</A>
    Together (commercial): <A HREF="http://www.oi.com/products/controlcenter/index.jsp">http://www.oi.com/products/controlcenter/index.jsp</A>
    InCASE - Tangram-based Universal Object Editor 
    Sybase PowerDesigner: <A HREF="http://www.sybase.com/powerdesigner">http://www.sybase.com/powerdesigner</A>
</PRE>
<PRE>

  UML Editors:
    Fujaba (free, university): <A HREF="http://www.fujaba.de/">http://www.fujaba.de/</A>
    ArgoUML (free): <A HREF="http://argouml.tigris.org/">http://argouml.tigris.org/</A>
    Poseidon (commercial): <A HREF="http://www.gentleware.com/products/poseidonDE.php3">http://www.gentleware.com/products/poseidonDE.php3</A>
    Co-operative UML Editor (research): <A HREF="http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html">http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html</A>
    Metamill (commercial): <A HREF="http://www.metamill.com/">http://www.metamill.com/</A>
    Violet (university, research, education): <A HREF="http://www.horstmann.com/violet/">http://www.horstmann.com/violet/</A>
    PyUt (free): <A HREF="http://pyut.sourceforge.net/">http://pyut.sourceforge.net/</A>
    (Dia (free): <A HREF="http://www.lysator.liu.se/~alla/dia/">http://www.lysator.liu.se/~alla/dia/</A>)
    UMLet (free, university): <A HREF="http://www.swt.tuwien.ac.at/umlet/index.html">http://www.swt.tuwien.ac.at/umlet/index.html</A>
    Voodoo (free): <A HREF="http://voodoo.sourceforge.net/">http://voodoo.sourceforge.net/</A>
    Umbrello UML Modeller: <A HREF="http://uml.sourceforge.net/">http://uml.sourceforge.net/</A></PRE>
<PRE>
  UML Tools:
    <A HREF="http://www.objectsbydesign.com/tools/umltools_byPrice.html">http://www.objectsbydesign.com/tools/umltools_byPrice.html</A></PRE>
<PRE>
  Further readings:
    <A HREF="http://www.google.com/search?q=web+based+uml+editor&amp">http://www.google.com/search?q=web+based+uml+editor&amp</A>;hl=en&amp;lr=&amp;ie=UTF-8&amp;oe=UTF-8&amp;start=10&amp;sa=N
    <A HREF="http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf">http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf</A>
    <A HREF="http://www.enhyper.com/src/documentation/">http://www.enhyper.com/src/documentation/</A>
    <A HREF="http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf">http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf</A>
    <A HREF="http://citeseer.nj.nec.com/vilain00diagrammatic.html">http://citeseer.nj.nec.com/vilain00diagrammatic.html</A>
    <A HREF="http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp">http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp</A></PRE>

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1	joko	1.1	<HTML>
2			<HEAD>
3			<TITLE>Data::Storage</TITLE>
4			<LINK REV="made" HREF="mailto:">
5			</HEAD>
6
7			<BODY>
8
9			<A NAME="__index__"></A>
10			<!-- INDEX BEGIN -->
11
12			<UL>
13
14			<LI><A HREF="#name">NAME</A></LI>
15			<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
16			<UL>
17
18			<LI><A HREF="#note">NOTE</A></LI>
19			</UL>
20
21	joko	1.3	<LI><A HREF="#requirements">REQUIREMENTS</A></LI>
22	joko	1.1	<LI><A HREF="#description">DESCRIPTION</A></LI>
23			<LI><A HREF="#authors / copyright">AUTHORS / COPYRIGHT</A></LI>
24			<LI><A HREF="#acknowledgements">ACKNOWLEDGEMENTS</A></LI>
25			<LI><A HREF="#support / warranty">SUPPORT / WARRANTY</A></LI>
26			<LI><A HREF="#todo">TODO</A></LI>
27			<UL>
28
29			<LI><A HREF="#handle the following errors/cases:">Handle the following errors/cases:</A></LI>
30			<UL>
31
32			<LI><A HREF="#dbierror [tangram]: dbd::mysql::st execute failed: unknown column 't1.requestdump' in 'field list'">``DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'''</A></LI>
33			<LI><A HREF="#compare schema (structure diff) with database ...">Compare schema (structure diff) with database ...</A></LI>
34			</UL>
35
36			<LI><A HREF="#introduce some features:">Introduce some features:</A></LI>
37			<UL>
38
39			<LI><A HREF="#links:">Links:</A></LI>
40			</UL>
41
42			</UL>
43
44			</UL>
45			<!-- INDEX END -->
46
47			<HR>
48			<P>
49			<H1><A NAME="name">NAME</A></H1>
50			<P>Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way</P>
51			<P>
52			<HR>
53			<H1><A NAME="synopsis">SYNOPSIS</A></H1>
54			<PRE>
55			... the basic way:</PRE>
56			<PRE>
57			... via inheritance:
58			</PRE>
59			<PRE>
60
61			use Data::Storage;
62			my $proxyObj = new HttpProxy;
63			$proxyObj->{url} = $url;
64			$proxyObj->{payload} = $content;
65			$self->{storage}->insert($proxyObj);</PRE>
66			<PRE>
67
68			use Data::Storage;
69			my $proxyObj = HttpProxy->new(
70			url => $url,
71			payload => $content,
72			);
73			$self->{storage}->insert($proxyObj);</PRE>
74			<P>
75			<H2><A NAME="note">NOTE</A></H2>
76			<P>This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks.
77	joko	1.3	Please look at their documentation and/or this code for additional information.</P>
78			<P>
79			<HR>
80			<H1><A NAME="requirements">REQUIREMENTS</A></H1>
81			<P>For full functionality:
82			DBI from CPAN
83			Tangram from CPAN
84			Class::Tangram from CPAN
85			MySQL::Diff from <A HREF="http://adamspiers.org/computing/mysqldiff/">http://adamspiers.org/computing/mysqldiff/</A>
86			... and all their dependencies</P>
87	joko	1.1	<P>
88			<HR>
89			<H1><A NAME="description">DESCRIPTION</A></H1>
90			<P>Data::Storage is module for a accessing various ``data structures'' stored inside
91			various ``data containers''. It sits on top of DBI and/or Tangram.</P>
92			<P>
93			<HR>
94			<H1><A NAME="authors / copyright">AUTHORS / COPYRIGHT</A></H1>
95			<P>The Data::Storage module is Copyright (c) 2002 Andreas Motl.
96			All rights reserved.</P>
97			<P>You may distribute it under the terms of either the GNU General Public
98			License or the Artistic License, as specified in the Perl README file.</P>
99			<P>
100			<HR>
101			<H1><A NAME="acknowledgements">ACKNOWLEDGEMENTS</A></H1>
102	joko	1.3	<P>Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object,
103			Sam Vilain for Class::Tangram, Adam Spiers for MySQL::Diff and all contributors.</P>
104	joko	1.1	<P>
105			<HR>
106			<H1><A NAME="support / warranty">SUPPORT / WARRANTY</A></H1>
107			<P>Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.</P>
108			<P>
109			<HR>
110			<H1><A NAME="todo">TODO</A></H1>
111			<P>
112			<H2><A NAME="handle the following errors/cases:">Handle the following errors/cases:</A></H2>
113			<P>
114			<H3><A NAME="dbierror [tangram]: dbd::mysql::st execute failed: unknown column 't1.requestdump' in 'field list'">``DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'''</A></H3>
115			<PRE>
116			... occours when operating on object-attributes not introduced yet:
117			this should be detected and appended/replaced through:
118			"Schema-Error detected, maybe (just) an inconsistency.
119			Please check if your declaration in schema-module "a" matches structure in database "b" or try to run"
120			db_setup.pl --dbkey=import --action=deploy</PRE>
121			<P>
122			<H3><A NAME="compare schema (structure diff) with database ...">Compare schema (structure diff) with database ...</A></H3>
123			<PRE>
124			... when issuing "db_setup.pl --dbkey=import --action=deploy"
125			on a database with an already deployed schema, use an additional "--update" then
126			to lift the schema inside the database to the current declared schema.
127			You will have to approve removals and changes on field-level while
128			new objects and new fields are introduced silently without any interaction needed.
129			In future versions there may be additional options to control silent processing of
130			removals and changes.
131			See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas,
132			don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself.
133			Classes:
134			C create -> yes, handled automatically
135			R retrieve -> no, not subject of this aspect since it is about deployment only
136			U update -> yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here)
137			D delete -> yes, just by user-interaction
138			Class variables:
139			C create -> yes, handled automatically
140			R retrieve -> no, not subject of this aspect since it is about deployment only
141			U update -> yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost
142			D delete -> yes, just by user-interaction
143	joko	1.2	</PRE>
144			<PRE>
145
146			It's all about not to be able to loose data simply while this is in pre-alpha stage.
147			And loosing data by being able to modify and redeploy schemas easily is definitely quite easy.</PRE>
148			<PRE>
149
150			As we can see, creations of Classes and new Class variables is handled
151			automatically and this is believed to be the most common case under normal circumstances.</PRE>
152	joko	1.1	<P>
153			<H2><A NAME="introduce some features:">Introduce some features:</A></H2>
154			<PRE>
155	joko	1.2	- Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.
156			- Make it possible to load/save schemas in XMI (XML Metadata Interchange),
157			which seems to be most commonly used today, perhaps handle objects with OIFML.
158			Integrate/bundle this with a web-/html-based UML modeling tool or
159			some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based)
160			- Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers.
161			- Add some more handlers:
162			- look at DBD::CSV, Text::CSV, XML::CSV, XML::Excel
163			- Add some more locations/locators:
164			- PerlDAV: <A HREF="http://www.webdav.org/perldav/">http://www.webdav.org/perldav/</A>
165			- Move to t3, use InCASE</PRE>
166	joko	1.1	<P>
167			<H3><A NAME="links:">Links:</A></H3>
168			<PRE>
169	joko	1.2	Specs:
170	joko	1.1	UML 1.3 Spec: <A HREF="http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf">http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf</A>
171			XMI 1.1 Spec: <A HREF="http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf">http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf</A>
172			XMI 2.0 Spec: <A HREF="http://cgi.omg.org/docs/ad/01-06-12.pdf">http://cgi.omg.org/docs/ad/01-06-12.pdf</A>
173			ODMG: <A HREF="http://odmg.org/">http://odmg.org/</A>
174	joko	1.2	OIFML: <A HREF="http://odmg.org/library/readingroom/oifml.pdf">http://odmg.org/library/readingroom/oifml.pdf</A></PRE>
175			<PRE>
176			CASE Tools:
177			Rational Rose (commercial): <A HREF="http://www.rational.com/products/rose/">http://www.rational.com/products/rose/</A>
178			Together (commercial): <A HREF="http://www.oi.com/products/controlcenter/index.jsp">http://www.oi.com/products/controlcenter/index.jsp</A>
179			InCASE - Tangram-based Universal Object Editor
180			Sybase PowerDesigner: <A HREF="http://www.sybase.com/powerdesigner">http://www.sybase.com/powerdesigner</A>
181			</PRE>
182	joko	1.1	<PRE>
183	joko	1.2
184			UML Editors:
185			Fujaba (free, university): <A HREF="http://www.fujaba.de/">http://www.fujaba.de/</A>
186			ArgoUML (free): <A HREF="http://argouml.tigris.org/">http://argouml.tigris.org/</A>
187			Poseidon (commercial): <A HREF="http://www.gentleware.com/products/poseidonDE.php3">http://www.gentleware.com/products/poseidonDE.php3</A>
188			Co-operative UML Editor (research): <A HREF="http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html">http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html</A>
189			Metamill (commercial): <A HREF="http://www.metamill.com/">http://www.metamill.com/</A>
190			Violet (university, research, education): <A HREF="http://www.horstmann.com/violet/">http://www.horstmann.com/violet/</A>
191			PyUt (free): <A HREF="http://pyut.sourceforge.net/">http://pyut.sourceforge.net/</A>
192			(Dia (free): <A HREF="http://www.lysator.liu.se/~alla/dia/">http://www.lysator.liu.se/~alla/dia/</A>)
193			UMLet (free, university): <A HREF="http://www.swt.tuwien.ac.at/umlet/index.html">http://www.swt.tuwien.ac.at/umlet/index.html</A>
194	joko	1.3	Voodoo (free): <A HREF="http://voodoo.sourceforge.net/">http://voodoo.sourceforge.net/</A>
195			Umbrello UML Modeller: <A HREF="http://uml.sourceforge.net/">http://uml.sourceforge.net/</A></PRE>
196	joko	1.2	<PRE>
197			UML Tools:
198			<A HREF="http://www.objectsbydesign.com/tools/umltools_byPrice.html">http://www.objectsbydesign.com/tools/umltools_byPrice.html</A></PRE>
199			<PRE>
200			Further readings:
201	joko	1.1	<A HREF="http://www.google.com/search?q=web+based+uml+editor&amp">http://www.google.com/search?q=web+based+uml+editor&amp</A>;hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N
202			<A HREF="http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf">http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf</A>
203			<A HREF="http://www.enhyper.com/src/documentation/">http://www.enhyper.com/src/documentation/</A>
204			<A HREF="http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf">http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf</A>
205			<A HREF="http://citeseer.nj.nec.com/vilain00diagrammatic.html">http://citeseer.nj.nec.com/vilain00diagrammatic.html</A>
206			<A HREF="http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp">http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp</A></PRE>
207
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