/[cvs]/nfo/perl/libs/Data/README.perldoc
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Contents of /nfo/perl/libs/Data/README.perldoc

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Revision 1.2 - (show annotations)
Tue Oct 29 19:24:46 2002 UTC (22 years ago) by joko
Branch: MAIN
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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 It's all about not to be able to loose data simply while this is in alpha stage.
81
82 Introduce some features:
83
84 Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.
85 Make it possible to load/save schemas in XMI (XML Metadata Interchange),
86 which seems to be most commonly used today, perhaps handle objects with OIFML.
87 Integrate/bundle this with a web-/html-based UML modeling tool or
88 some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based)
89 Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmer.
90
91 Links:
92
93 UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf
94 XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf
95 XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf
96 ODMG: http://odmg.org/
97 OIFML: http://odmg.org/library/readingroom/oifml.pdf
98 Co-operative UML Editor: http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html
99
100 further readings:
101 http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N
102 http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf
103 http://www.enhyper.com/src/documentation/
104 http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf
105 http://citeseer.nj.nec.com/vilain00diagrammatic.html
106 http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp
107
108 maybe useful for / to be integrated with:
109 ArapXML: http://xml.coverpages.org/ni2001-09-24-b.html

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