1DBIx::Class::DeploymentUHsaenrdlCeorn(t3r)ibuted Perl DoDcBuImxe:n:tCaltaisosn::DeploymentHandler(3)
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NAME

6       DBIx::Class::DeploymentHandler - Extensible DBIx::Class deployment
7

SYNOPSIS

9        use aliased 'DBIx::Class::DeploymentHandler' => 'DH';
10        my $s = My::Schema->connect(...);
11
12        my $dh = DH->new({
13          schema              => $s,
14          databases           => 'SQLite',
15          sql_translator_args => { add_drop_table => 0 },
16        });
17
18        $dh->prepare_install;
19
20        $dh->install;
21
22       or for upgrades:
23
24        use aliased 'DBIx::Class::DeploymentHandler' => 'DH';
25        my $s = My::Schema->connect(...);
26
27        my $dh = DH->new({
28          schema              => $s,
29          databases           => 'SQLite',
30          sql_translator_args => { add_drop_table => 0 },
31        });
32
33        $dh->prepare_deploy;
34        $dh->prepare_upgrade({
35          from_version => 1,
36          to_version   => 2,
37        });
38
39        $dh->upgrade;
40

DESCRIPTION

42       "DBIx::Class::DeploymentHandler" is, as its name suggests, a tool for
43       deploying and upgrading databases with DBIx::Class.  It is designed to
44       be much more flexible than DBIx::Class::Schema::Versioned, hence the
45       use of Moose and lots of roles.
46
47       "DBIx::Class::DeploymentHandler" itself is just a recommended set of
48       roles that we think will not only work well for everyone, but will also
49       yield the best overall mileage.  Each role it uses has its own nuances
50       and documentation, so I won't describe all of them here, but here are a
51       few of the major benefits over how DBIx::Class::Schema::Versioned
52       worked (and DBIx::Class::DeploymentHandler::Deprecated tries to
53       maintain compatibility with):
54
55       ·   Downgrades in addition to upgrades.
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57       ·   Multiple sql files files per upgrade/downgrade/install.
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59       ·   Perl scripts allowed for upgrade/downgrade/install.
60
61       ·   Just one set of files needed for upgrade, unlike before where one
62           might need to generate "factorial(scalar @versions)", which is just
63           silly.
64
65       ·   And much, much more!
66
67       That's really just a taste of some of the differences.  Check out each
68       role for all the details.
69

WHERE IS ALL THE DOC?!

71       To get up and running fast, your best place to start is
72       DBIx::Class::DeploymentHandler::Manual::Intro and then
73       DBIx::Class::DeploymentHandler::Manual::CatalystIntro if your intending
74       on using this with Catalyst.
75
76       For the full story you should realise that
77       "DBIx::Class::DeploymentHandler" extends
78       DBIx::Class::DeploymentHandler::Dad, so that's probably the first place
79       to look when you are trying to figure out how everything works.
80
81       Next would be to look at all the pieces that fill in the blanks that
82       DBIx::Class::DeploymentHandler::Dad expects to be filled.  They would
83       be DBIx::Class::DeploymentHandler::DeployMethod::SQL::Translator,
84       DBIx::Class::DeploymentHandler::VersionHandler::Monotonic,
85       DBIx::Class::DeploymentHandler::VersionStorage::Standard, and
86       DBIx::Class::DeploymentHandler::WithReasonableDefaults.
87

WHY IS THIS SO WEIRD

89       "DBIx::Class::DeploymentHandler" has a strange structure.  The gist is
90       that it delegates to three small objects that are proxied to via
91       interface roles that then create the illusion of one large, monolithic
92       object.  Here is a diagram that might help:
93
94       The nice thing about this is that we have well defined interfaces for
95       the objects that comprise the "DeploymentHandler", the smaller objects
96       can be tested in isolation, and the smaller objects can even be swapped
97       in easily.  But the real win is that you can subclass the
98       "DeploymentHandler" without knowing about the underlying delegation;
99       you just treat it like normal Perl and write methods that do what you
100       want.
101

THIS SUCKS

103       You started your project and weren't using
104       "DBIx::Class::DeploymentHandler"?  Lucky for you I had you in mind when
105       I wrote this doc.
106
107       First, define the version in your main schema file (maybe using
108       $VERSION).
109
110       Then you'll want to just install the version_storage:
111
112        my $s = My::Schema->connect(...);
113        my $dh = DBIx::Class::DeploymentHandler->new({ schema => $s });
114
115        $dh->prepare_version_storage_install;
116        $dh->install_version_storage;
117
118       Then set your database version:
119
120        $dh->add_database_version({ version => $s->schema_version });
121
122       Now you should be able to use "DBIx::Class::DeploymentHandler" like
123       normal!
124

LOGGING

126       This is a complex tool, and because of that sometimes you'll want to
127       see what exactly is happening.  The best way to do that is to use the
128       built in logging functionality.  It the standard six log levels;
129       "fatal", "error", "warn", "info", "debug", and "trace".  Most of those
130       are pretty self explanatory.  Generally a safe level to see what all is
131       going on is debug, which will give you everything except for the exact
132       SQL being run.
133
134       To enable the various logging levels all you need to do is set an
135       environment variables: "DBICDH_FATAL", "DBICDH_ERROR", "DBICDH_WARN",
136       "DBICDH_INFO", "DBICDH_DEBUG", and "DBICDH_TRACE".  Each level can be
137       set on its own, but the default is the first three on and the last
138       three off, and the levels cascade, so if you turn on trace the rest
139       will turn on automatically.
140

DONATIONS

142       If you'd like to thank me for the work I've done on this module, don't
143       give me a donation. I spend a lot of free time creating free software,
144       but I do it because I love it.
145
146       Instead, consider donating to someone who might actually need it.
147       Obviously you should do research when donating to a charity, so don't
148       just take my word on this.  I like Matthew 25: Ministries:
149       <http://www.m25m.org/>, but there are a host of other charities that
150       can do much more good than I will with your money.  (Third party
151       charity info here:
152       <http://www.charitynavigator.org/index.cfm?bay=search.summary&orgid=6901>
153

METHODS

155   prepare_version_storage_install
156        $dh->prepare_version_storage_install
157
158       Creates the needed ".sql" file to install the version storage and not
159       the rest of the tables
160
161   prepare_install
162        $dh->prepare_install
163
164       First prepare all the tables to be installed and the prepare just the
165       version storage
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167   install_version_storage
168        $dh->install_version_storage
169
170       Install the version storage and not the rest of the tables
171

AUTHOR

173       Arthur Axel "fREW" Schmidt <frioux+cpan@gmail.com>
174

176       This software is copyright (c) 2018 by Arthur Axel "fREW" Schmidt.
177
178       This is free software; you can redistribute it and/or modify it under
179       the same terms as the Perl 5 programming language system itself.
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183perl v5.28.0                      2018-01-06 DBIx::Class::DeploymentHandler(3)
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