libs/Data/README.text

NAME
    Data::Storage - Interface for accessing various Storage implementations
    for Perl in an independent way

SYNOPSIS
      ... the basic way:

      ... via inheritance:
  
        use Data::Storage;
        my $proxyObj = new HttpProxy;
        $proxyObj->{url} = $url;
        $proxyObj->{payload} = $content;
        $self->{storage}->insert($proxyObj);
    
        use Data::Storage;
        my $proxyObj = HttpProxy->new(
          url => $url,
          payload => $content,
        );
        $self->{storage}->insert($proxyObj);

  NOTE

    This module heavily relies on DBI and Tangram, but adds a lot of
    additional bugs and quirks. Please look at their documentation and this
    code for additional information.

DESCRIPTION
    Data::Storage is module for a accessing various "data structures" stored
    inside various "data containers". It sits on top of DBI and/or Tangram.

AUTHORS / COPYRIGHT
    The Data::Storage module is Copyright (c) 2002 Andreas Motl. All rights
    reserved.

    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.

ACKNOWLEDGEMENTS
    Larry Wall and the "perl5-porters" for Perl, Tim Bunce for DBI,
    Jean-Louis Leroy for Tangram and Set::Object, Sam Vilain for
    Class::Tangram.

SUPPORT / WARRANTY
    Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.

TODO
  Handle the following errors/cases:

   "DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'"

        ... occours when operating on object-attributes not introduced yet:
        this should be detected and appended/replaced through:
        "Schema-Error detected, maybe (just) an inconsistency. 
        Please check if your declaration in schema-module "a" matches structure in database "b" or try to run"
        db_setup.pl --dbkey=import --action=deploy

   Compare schema (structure diff) with database ...

      ... when issuing "db_setup.pl --dbkey=import --action=deploy"
      on a database with an already deployed schema, use an additional "--update" 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    ->  yes, handled automatically
        R retrieve  ->  no, not subject of this aspect since it is about deployment only
        U update    ->  yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here)
        D delete    ->  yes, just by user-interaction
      Class variables:
        C create    ->  yes, handled automatically
        R retrieve  ->  no, not subject of this aspect since it is about deployment only
        U update    ->  yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost
        D delete    ->  yes, just by user-interaction
  
      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.
  
      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.

  Introduce some features:

      - 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 "Co-operative UML Editor" 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: http://www.webdav.org/perldav/
      - Move to t3, use InCASE

   Links:

      Specs:
        UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf
        XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf
        XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf
        ODMG: http://odmg.org/
        OIFML: http://odmg.org/library/readingroom/oifml.pdf

      CASE Tools:
        Rational Rose (commercial): http://www.rational.com/products/rose/
        Together (commercial): http://www.oi.com/products/controlcenter/index.jsp
        InCASE - Tangram-based Universal Object Editor 
        Sybase PowerDesigner: http://www.sybase.com/powerdesigner
  
      UML Editors:
        Fujaba (free, university): http://www.fujaba.de/
        ArgoUML (free): http://argouml.tigris.org/
        Poseidon (commercial): http://www.gentleware.com/products/poseidonDE.php3
        Co-operative UML Editor (research): http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html
        Metamill (commercial): http://www.metamill.com/
        Violet (university, research, education): http://www.horstmann.com/violet/
        PyUt (free): http://pyut.sourceforge.net/
        (Dia (free): http://www.lysator.liu.se/~alla/dia/)
        UMLet (free, university): http://www.swt.tuwien.ac.at/umlet/index.html
        Voodoo (free): http://voodoo.sourceforge.net/

      UML Tools:
        http://www.objectsbydesign.com/tools/umltools_byPrice.html

      Further readings:
        http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N
        http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf
        http://www.enhyper.com/src/documentation/
        http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf
        http://citeseer.nj.nec.com/vilain00diagrammatic.html
        http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp

1	NAME
2	Data::Storage - Interface for accessing various Storage implementations
3	for Perl in an independent way
4
5	SYNOPSIS
6	... the basic way:
7
8	... via inheritance:
9
10	use Data::Storage;
11	my $proxyObj = new HttpProxy;
12	$proxyObj->{url} = $url;
13	$proxyObj->{payload} = $content;
14	$self->{storage}->insert($proxyObj);
15
16	use Data::Storage;
17	my $proxyObj = HttpProxy->new(
18	url => $url,
19	payload => $content,
20	);
21	$self->{storage}->insert($proxyObj);
22
23	NOTE
24
25	This module heavily relies on DBI and Tangram, but adds a lot of
26	additional bugs and quirks. Please look at their documentation and this
27	code for additional information.
28
29	DESCRIPTION
30	Data::Storage is module for a accessing various "data structures" stored
31	inside various "data containers". It sits on top of DBI and/or Tangram.
32
33	AUTHORS / COPYRIGHT
34	The Data::Storage module is Copyright (c) 2002 Andreas Motl. All rights
35	reserved.
36
37	You may distribute it under the terms of either the GNU General Public
38	License or the Artistic License, as specified in the Perl README file.
39
40	ACKNOWLEDGEMENTS
41	Larry Wall and the "perl5-porters" for Perl, Tim Bunce for DBI,
42	Jean-Louis Leroy for Tangram and Set::Object, Sam Vilain for
43	Class::Tangram.
44
45	SUPPORT / WARRANTY
46	Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.
47
48	TODO
49	Handle the following errors/cases:
50
51	"DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'"
52
53	... occours when operating on object-attributes not introduced yet:
54	this should be detected and appended/replaced through:
55	"Schema-Error detected, maybe (just) an inconsistency.
56	Please check if your declaration in schema-module "a" matches structure in database "b" or try to run"
57	db_setup.pl --dbkey=import --action=deploy
58
59	Compare schema (structure diff) with database ...
60
61	... when issuing "db_setup.pl --dbkey=import --action=deploy"
62	on a database with an already deployed schema, use an additional "--update" then
63	to lift the schema inside the database to the current declared schema.
64	You will have to approve removals and changes on field-level while
65	new objects and new fields are introduced silently without any interaction needed.
66	In future versions there may be additional options to control silent processing of
67	removals and changes.
68	See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas,
69	don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself.
70	Classes:
71	C create -> yes, handled automatically
72	R retrieve -> no, not subject of this aspect since it is about deployment only
73	U update -> yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here)
74	D delete -> yes, just by user-interaction
75	Class variables:
76	C create -> yes, handled automatically
77	R retrieve -> no, not subject of this aspect since it is about deployment only
78	U update -> yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost
79	D delete -> yes, just by user-interaction
80
81	It's all about not to be able to loose data simply while this is in pre-alpha stage.
82	And loosing data by being able to modify and redeploy schemas easily is definitely quite easy.
83
84	As we can see, creations of Classes and new Class variables is handled
85	automatically and this is believed to be the most common case under normal circumstances.
86
87	Introduce some features:
88
89	- Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.
90	- Make it possible to load/save schemas in XMI (XML Metadata Interchange),
91	which seems to be most commonly used today, perhaps handle objects with OIFML.
92	Integrate/bundle this with a web-/html-based UML modeling tool or
93	some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based)
94	- Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers.
95	- Add some more handlers:
96	- look at DBD::CSV, Text::CSV, XML::CSV, XML::Excel
97	- Add some more locations/locators:
98	- PerlDAV: http://www.webdav.org/perldav/
99	- Move to t3, use InCASE
100
101	Links:
102
103	Specs:
104	UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf
105	XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf
106	XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf
107	ODMG: http://odmg.org/
108	OIFML: http://odmg.org/library/readingroom/oifml.pdf
109
110	CASE Tools:
111	Rational Rose (commercial): http://www.rational.com/products/rose/
112	Together (commercial): http://www.oi.com/products/controlcenter/index.jsp
113	InCASE - Tangram-based Universal Object Editor
114	Sybase PowerDesigner: http://www.sybase.com/powerdesigner
115
116	UML Editors:
117	Fujaba (free, university): http://www.fujaba.de/
118	ArgoUML (free): http://argouml.tigris.org/
119	Poseidon (commercial): http://www.gentleware.com/products/poseidonDE.php3
120	Co-operative UML Editor (research): http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html
121	Metamill (commercial): http://www.metamill.com/
122	Violet (university, research, education): http://www.horstmann.com/violet/
123	PyUt (free): http://pyut.sourceforge.net/
124	(Dia (free): http://www.lysator.liu.se/~alla/dia/)
125	UMLet (free, university): http://www.swt.tuwien.ac.at/umlet/index.html
126	Voodoo (free): http://voodoo.sourceforge.net/
127
128	UML Tools:
129	http://www.objectsbydesign.com/tools/umltools_byPrice.html
130
131	Further readings:
132	http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N
133	http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf
134	http://www.enhyper.com/src/documentation/
135	http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf
136	http://citeseer.nj.nec.com/vilain00diagrammatic.html
137	http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp
138
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