1 package DBIx::Class::Schema::Loader;
5 use base qw/DBIx::Class::Schema/;
6 use base qw/Class::Data::Accessor/;
8 use UNIVERSAL::require;
10 # Always remember to do all digits for the version even if they're 0
11 # i.e. first release of 0.XX *must* be 0.XX000. This avoids fBSD ports
12 # brain damage and presumably various other packaging systems too
13 our $VERSION = '0.02001';
15 __PACKAGE__->mk_classaccessor('loader');
19 DBIx::Class::Schema::Loader - Dynamic definition of a DBIx::Class::Schema
24 use base qw/DBIx::Class::Schema::Loader/;
26 __PACKAGE__->load_from_connection(
27 dsn => "dbi:mysql:dbname",
30 additional_classes => [qw/DBIx::Class::Foo/],
31 additional_base_classes => [qw/My::Stuff/],
32 left_base_classes => [qw/DBIx::Class::Bar/],
33 components => [qw/ResultSetManager/],
34 resultset_components => [qw/AlwaysRS/],
35 constraint => '^foo.*',
37 options => { AutoCommit => 1 },
38 inflect => { child => 'children' },
42 # in seperate application code ...
46 my $schema1 = My::Schema->connect( $dsn, $user, $password, $attrs);
48 my $schema1 = "My::Schema";
49 # ^^ defaults to dsn/user/pass from load_from_connection()
51 # Get a list of the original (database) names of the tables that
53 my @tables = $schema1->loader->tables;
55 # Get a hashref of table_name => 'TableName' table-to-moniker
57 my $monikers = $schema1->loader->monikers;
59 # Get a hashref of table_name => 'My::Schema::TableName'
60 # table-to-classname mappings.
61 my $classes = $schema1->loader->classes;
63 # Use the schema as per normal for DBIx::Class::Schema
64 my $rs = $schema1->resultset($monikers->{foo_table})->search(...);
68 DBIx::Class::Schema::Loader automates the definition of a
69 DBIx::Class::Schema by scanning table schemas and setting up
70 columns and primary keys.
72 DBIx::Class::Schema::Loader supports MySQL, Postgres, SQLite and DB2. See
73 L<DBIx::Class::Schema::Loader::Generic> for more, and
74 L<DBIx::Class::Schema::Loader::Writing> for notes on writing your own
75 db-specific subclass for an unsupported db.
77 This module requires L<DBIx::Class> 0.05 or later, and obsoletes
78 L<DBIx::Class::Loader> for L<DBIx::Class> version 0.05 and later.
80 While on the whole, the bare table definitions are fairly straightforward,
81 relationship creation is somewhat heuristic, especially in the choosing
82 of relationship types, join types, and relationship names. The relationships
83 generated by this module will probably never be as well-defined as
84 hand-generated ones. Because of this, over time a complex project will
85 probably wish to migrate off of L<DBIx::Class::Schema::Loader>.
87 It is designed more to get you up and running quickly against an existing
88 database, or to be effective for simple situations, rather than to be what
89 you use in the long term for a complex database/project.
91 That being said, transitioning your code from a Schema generated by this
92 module to one that doesn't use this module should be straightforward and
93 painless, so don't shy away from it just for fears of the transition down
98 =head2 load_from_connection
100 Example in Synopsis above demonstrates the available arguments. For
101 detailed information on the arguments, see the
102 L<DBIx::Class::Schema::Loader::Generic> documentation.
106 sub load_from_connection {
107 my ( $class, %args ) = @_;
109 croak 'dsn argument is required' if ! $args{dsn};
110 my $dsn = $args{dsn};
111 my ($driver) = $dsn =~ m/^dbi:(\w*?)(?:\((.*?)\))?:/i;
112 $driver = 'SQLite' if $driver eq 'SQLite2';
113 my $impl = "DBIx::Class::Schema::Loader::" . $driver;
116 croak qq/Couldn't require loader class "$impl",/ .
117 qq/"$UNIVERSAL::require::ERROR"/;
119 $args{schema} = $class;
121 $class->loader($impl->new(%args));
122 $class->loader->load;
127 This is an accessor in the generated Schema class for accessing
128 the L<DBIx::Class::Schema::Loader::Generic> -based loader object
129 that was used during construction. See the
130 L<DBIx::Class::Schema::Loader::Generic> docs for more information
131 on the available loader methods there.
135 Aside from relationship definitions being less than ideal in general,
136 this version is known not to handle the case of multiple relationships
137 between the same pair of tables. All of the relationship code will
138 be overhauled on the way to 0.03, at which time that bug will be
143 Brandon Black, C<blblack@gmail.com>
145 Based on L<DBIx::Class::Loader> by Sebastian Riedel
147 Based upon the work of IKEBE Tomohiro
151 Adam Anderson, Andy Grundman, Autrijus Tang, Dan Kubb, David Naughton,
152 Randal Schwartz, Simon Flack and all the others who've helped.
156 This library is free software; you can redistribute it and/or modify it under
157 the same terms as Perl itself.