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	joko	1.1	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	joko	1.2
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	joko	1.1
87			Introduce some features:
88
89	joko	1.2	- 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	joko	1.1
101			Links:
102
103	joko	1.2	Specs:
104	joko	1.1	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	joko	1.2	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	joko	1.1	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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