<div class="slide">
<h1>Authors</h1>
<h4>Originally Leo Lapworth @ LPW 2009</h4>
- <h4>Matthew S. Trout</h4>
+ <h4>Amiri Barksdale</h4>
<h4>Justin D. Hunter</h4>
<h4>Arthur Axel "fREW" Schmidt</h4>
</div>
<h1>What's up guys?</h1>
<div class="notes">
<ul>
- <li>How many people have designed a database with Foreign Keys?</li>
<li>How many people have used any ORM?<ul>
<li>In Perl?<ul>
<li>DBIC?</li>
- <li> Class::DBI? </li>
- <li> Rose::DB? </li>
- <li> Fey? </li>
- <li> Others? </li>
+ <li>Class::DBI?</li>
+ <li>Rose::DB?</li>
+ <li>Fey?</li>
+ <li>Others?</li>
</ul></li>
- <li>AR? </li>
- <li> DataMapper? </li>
+ <li>AR?</li>
+ <li>DataMapper?</li>
<li>(N)Hibernate?</li>
</ul></li>
</ul>
</div>
<div class="slide">
+ <h1>Purpose</h1>
+ <p>The purpose of this talk is to show you as many features of
+ DBIx::Class in 40 minutes so that when you need to do something with
+ it later you will know what's possible</p>
+ </div>
+
+ <div class="slide">
<h1>DBIx::Class?</h1>
<ul>
<li>ORM (object relational mapper)</li>
<li>SQL <-> OO (using objects instead of SQL)</li>
- <li>Simple, powerful, complex, fab and confusing</li>
<li>There are many ORMs, DBIx::Class just happens to be the best in Perl (personal opinion)</li>
</ul>
</div>
<div class="slide">
- <h1>Purpose</h1>
- <p>The purpose of this talk is to show you as many features of
- DBIx::Class in 40 minutes
- so that when you need to do something with it later you will
- know what's possible</p>
+ <h1>Meta</h1>
+ <p>These are reasons that are not technical or inherent to
+ the code of DBIC, but are totally awesome things about it.</p>
+ </div>
+
+ <div class="slide">
+ <h1>Large Community</h1>
+ <p>Currently there are 88 people listed as contributors to DBIC. That
+ ranges from documentation help, to test help, to added features,
+ to entire database support.</p>
+ </div>
+
+ <div class="slide">
+ <h1>Active Community</h1>
+ <p>Currently (June 9, 2010) 6 active branches (commited to in the last two weeks) in git. Last release (0.08122) had 14 new features, and 16 bug fixes. Of course that <a href="http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits/DBIx-Class.git;a=blob;f=Changes">ebbs and flows</a>.</p>
+ </div>
+
+ <div class="slide">
+ <h1>Responsive Community</h1>
+ <ul class="incremental">
+ <li>needed MSSQL Order by support, they helped me add support</li>
+ <li>generally very welcoming of people willing to help</li>
+ </ul>
+ </div>
+
+ <div class="slide">
+ <h1>General ORM</h1>
+ <p>These are things that are in most other ORMs, but are still reasons
+ to use DBIC over raw SQL.</p>
+ </div>
+
+ <div class="slide">
+ <h1>Cross DB</h1>
+ <p>The vast majority of code should run on all databases without needing tweaking</p>
</div>
<div class="slide">
<h1>Basic CRUD</h1>
- <ul>
+ <ul class="incremental">
<li><strong>C</strong> - Create</li>
<li><strong>R</strong> - Read</li>
<li><strong>U</strong> - Update</li>
title => 'A book title',
author_id => $author_id,
});</pre>
- <p>Don't need to work to pair placeholders and values</p>
- </div>
-
- <div class="slide">
- <h1>DBIC: Create</h1>
-<pre>my $pratchett = $author_rs->create({
- name => 'Terry Pratchett',
-});</pre>
- </div>
-
- <div class="slide">
- <h1>DBIC: Create</h1>
-<pre>my $book = $pratchett->create_related(
- <strong>books</strong> => {
- title => 'Another Discworld book',
-});</pre>
-<strong>or</strong>
-<pre>my $book = $pratchett->add_to_<strong>books</strong>({
- title => 'Another Discworld book',
-});</pre>
- <p>Automaticaly fills in foreign key for you</p>
+ <ul class="incremental">
+ <li>No need to pair placeholders and values</li>
+ <li>Automatically gets autoincremented id for you</li>
+ <li>Transparrently uses INSERT ... RETURNING for databases that support it</li>
+ </ul>
</div>
<div class="slide">
my @books = $book_rs->search({
author => $author_id,
})->all;</pre>
- <p>TMTOWTDI</p>
+ <ul class="incremental">
+ <li>TMTOWTDI</li>
+ </ul>
</div>
<div class="slide">
</div>
<div class="slide">
- <h1>DBIC: Read</h1>
-<pre>my $resultset = $book_rs->search({
- author => $author_id,
-});</pre>
- <p>Search takes SQL::Abstract formatted queries</p>
- <pre>> perldoc SQL::Abstract</p>
- </div>
-
- <div class="slide">
<h1>SQL: Update</h1>
<pre>my $update = $dbh->prepare('
UPDATE books
<pre>$book->update({
title => 'New title',
});</pre>
+ <ul class="incremental">
+ <li>Lazy Update</li>
+ </ul>
</div>
<div class="slide">
</div>
<div class="slide">
- <h1>Creating models</h1>
+ <h1>OO Overidability</h1>
+ <ul class="incremental">
+ <li>Override new if you want to do validation</li>
+ <li>Override delete if you want to disable deletion</li>
+ <li>and on and on</li>
+ </ul>
+ <div class="notes">
+ <p>I got yelled at about this before by people, so
+ we don't get EVERYTHING from OO, but we do get a lot
+ so :-P</p>
+ </div>
</div>
<div class="slide">
-<pre>package Foo::Schema::Result::Author;
-__PACKAGE__->table('authors');
-__PACKAGE__->add_columns(
- id => {
- data_type => 'int',
- is_auto_increment => 1
- },
- title => {
- data_type => 'varchar',
- is_nullable => 1,
- size => 255,
- },
-);
-__PACKAGE__->set_primary_key('id');
-__PACKAGE__->has_many( books =>
- 'Foo::Schema::Result::Book', 'author_id'
-);
-1;
-</pre>
+ <h1>Convenience Methods</h1>
+ <ul class="incremental">
+ <li>find_or_create</li>
+ <li>create_or_update</li>
+ </ul>
</div>
<div class="slide">
-<pre style="float: left; font-size: 80%;">package Foo::Schema::Result::Book;
-use strict; use warnings;
-__PACKAGE__->table('books');
-__PACKAGE__->add_columns(
- id => {
- data_type => 'int',
- is_auto_increment => 1
- },
- name => {
- data_type => 'varchar',
- is_nullable => 1,
- size => 255,
- },
-</pre>
-<pre style="float: left; font-size: 80%;">
- author_id => {
- data_type => 'int',
- size => 8,
- },
-);
-__PACKAGE__->set_primary_key('id');
-__PACKAGE__->belongs_to( author =>
- 'Foo::Schema::Result::Author', 'author_id'
-);
-1;
-</pre>
+ <h1>Non-column methods</h1>
+ <p>Need a method to get a user's gravatar URL? Add a
+ gravatar_url method to their Result class</p>
+ </div>
+
+ <div class="slide">
+ <h1>RELATIONSHIPS</h1>
+ <ul class="incremental">
+ <li><a href="http://search.cpan.org/perldoc?DBIx::Class::Relationship#belongs_to">belongs_to</a></li>
+ <li><a href="http://search.cpan.org/perldoc?DBIx::Class::Relationship#has_many">has_many</a></li>
+ <li><a href="http://search.cpan.org/perldoc?DBIx::Class::Relationship#might_have">might_have</a></li>
+ <li><a href="http://search.cpan.org/perldoc?DBIx::Class::Relationship#has_one">has_one</a></li>
+ <li><a href="http://search.cpan.org/perldoc?DBIx::Class::Relationship#many_to_many">many_to_many</a> (technically not a relationship)</li>
+ <li>SET AND FORGET</li>
+ </ul>
+ </div>
+
+ <div class="slide">
+ <h1>DBIx::Class Specific Features</h1>
+ <p>These things may be in other ORM's, but they are very specific, so doubtful</p>
</div>
<div class="slide">
</div>
<div class="slide">
- <h1>Splitting Logic Cleanly</h1>
- <p>Foo::Schema::Result::Bar = individual row</p>
- <p>Foo::Schema::ResultSet::Bar = searches / table </p>
+ <h1>Populate</h1>
+ <p>Made for inserting lots of rows very quicky into database</p>
+<pre>$schema->populate([ Users =>
+ [qw( username password )],
+ [qw( frew >=4char$ )],
+ [qw( ... )],
+ [qw( ... )],
+);
+</pre>
+ <ul class="incremental">
+ <li>I use this to <a href="http://blog.afoolishmanifesto.com/archives/1255">export our whole (200M~) db to SQLite</a></li>
+ </ul>
</div>
<div class="slide">
- <h1>Using your Schema</h1>
-<pre>#!perl
-use strict; use warnings;
-use lib 'lib';
-use Foo::Schema;
-my $schema = Foo::Schema->connect($dns, $user, $pass);
-my $author_rs = $schema->resultset('Author');
-my $author = $author_rs->create({
- name => 'Douglas Adams',
-});
-my $book = $author->add_to_books({
- title => '42',
+ <h1>Multicreate</h1>
+ <p>Create an object and all of it's related objects all at once</p>
+<pre>$schema->resultset('Author')->create({
+ name => 'Stephen King',
+ books => [{ title => 'The Dark Tower' }],
+ address => {
+ street => '123 Turtle Back Lane',
+ state => { abbreviation => 'ME' },
+ city => { name => 'Lowell' },
+ },
});
</pre>
+ <div class="notes">
+ <ul>
+ <li>books is a has_many</li>
+ <li>address is a belongs_to which in turn belongs to state and city each</li>
+ <li>for this to work right state and city must mark abbreviation and name as unique</li>
+ </ul>
+ </div>
</div>
<div class="slide">
- <h1>DEBUGGING</h1>
- <pre>DBIC_TRACE=1 ./your_script.pl</pre>
- </div>
-
- <div class="slide">
- <h1>SQL - debugging</h1>
-<pre>INSERT INTO authors (name)
- VALUES (?): 'Douglas Adams'
-
-INSERT INTO books (author, title)
- VALUES (?, ?): '5', '42'</pre>
- </div>
-
- <div class="slide">
- <h1>overloading</h1>
-<pre>Foo::Schema::Result::Book
-Foo::Schema::ResultSet::Book
-Foo::Schema::Result::Author
-Foo::Schema::ResultSet::Book</pre>
+ <h1>Extensible</h1>
+ <p>DBIx::Class helped pioneer fast MI in Perl 5 with Class::C3, so it is made
+ to allow extensions to nearly every part of it.</p>
</div>
<div class="slide">
- <h1>Result::</h1>
-<pre>package Foo::Schema::Result::Book;
-use base 'DBIx::Class::Core';
-use strict;
-use warnings;
-
-# Result code here
-
-sub isbn {
- my $self = shift;
-
- # search amazon or something
- my $api = Amazon::API->book({
- title => $self->title
- });
-
- return $api->isbn;
-}
-
-1;</pre>
+ <h1>Extensible: DBIC::Helpers</h1>
+ <ul class="incremental">
+ <li>DBIx::Class::Helper::ResultSet::IgnoreWantarray</li>
+ <li>DBIx::Class::Helper::ResultSet::Random</li>
+ <li>DBIx::Class::Helper::ResultSet::SetOperations</li>
+ <li>DBIx::Class::Helper::Row::JoinTable</li>
+ <li>DBIx::Class::Helper::Row::NumifyGet</li>
+ <li>DBIx::Class::Helper::Row::SubClass</li>
+ <li>DBIx::Class::Helper::Row::ToJSON</li>
+ </ul>
</div>
<div class="slide">
- <h1>Result::</h1>
-<pre>print $book->isbn;</pre>
+ <h1>Extensible: DBIC::TimeStamp</h1>
+ <ul class="incremental">
+ <li>Cross DB</li>
+ <li>set_on_create</li>
+ <li>set_on_update</li>
+ </ul>
</div>
<div class="slide">
- <h1>Result:: (inflating)</h1>
-<pre>package Foo::Schema::Result::Book;
-use base 'DBIx::Class::Core';
-use strict;
-use warnings;
-
-# Result code here
-
-__PACKAGE__->load_components('InflateColumn');
-use DateTime::Format::MySQL;
-
-__PACKAGE__-><strong>inflate_column</strong>(
- <strong>date_published</strong> => {
- inflate => sub { DateTime::Format::MySQL->parse_date(shift) },
- deflate => sub { shift->ymd},
- },
-);
-# Automatic see: DBIx::Class::InflateColumn::DateTime</pre>
+ <h1>Extensible: DBIx::Class::Schema::KiokuDB</h1>
+ <ul class="incremental">
+ <li>Kioku is the new hotness</li>
+ <li>Mix RDBMS with Object DB</li>
+ <li>beta ( == sexy )</li>
+ </ul>
</div>
<div class="slide">
- <h1>Result:: (deflating)</h1>
-<pre>$book->date_published(DateTime->now);
-$book->update;</pre>
+ <h1>SQL::Abstract</h1>
+<pre>my $resultset = $book_rs->search({
+ name => { -like => "%$nick%" },
+});</pre>
+ <ul class="incremental">
+ <li>(kinda) introspectible</li>
+ <li>Prettier than SQL</li>
+ </ul>
</div>
<div class="slide">
- <h1>Result:: (inflating)</h1>
-<pre>my $date_published = $book->date_published;
-print $date_published->month_abbr;</pre>
-
-<strong><em>Nov</em></strong>
+ <h1>Result vs ResultSet</h1>
+ <ul class="incremental">
+ <li>Result == Row</li>
+ <li>ResultSet == Query Plan<ul class="incremental">
+ <li>Internal Join Optimizer for all DB's (!!!)</li>
+ </ul></li>
+ <li>(less important but...)</li>
+ <li>ResultSource == Table</li>
+ <li>Storage == Database</li>
+ </ul>
</div>
<div class="slide">
- <h1>ResultSets::</h1>
-<pre>package Foo::Schema::ResultSet::Books;
+ <h1>ResultSet methods</h1>
+<pre>package MyApp::Schema::ResultSet::Book;
use base 'DBIx::Class::ResultSet';
-sub the_ultimate_books {
- my $self = shift;
- return $self->search({ title => { -like => '%42%' } });
-}
-sub by_author {
- my ( $self, $author ) = @_;
- return $self->search({ author => $author->id })
-}
-
-1;</pre>
- </div>
-
- <div class="slide">
- <h1>ResultSets::</h1>
-<pre>use Foo::Schema;
-my $schema = Foo::Schema->connect(...);
-my $book_rs = Foo::Schema->resultset('Book');
-my $book_search = $book_rs->the_ultimate_books;
-my @books = $book_search->all;</pre>
- </div>
-
- <div class="slide">
- <h1>ResultSets: Chaining</h1>
-<pre>
-my $book_rs = $schema->resultset('Book');
-my $author_rs = $schema->resultset('Author');
-my $author = $author_rs->search({ name => 'Douglas Adams' })->single;
-$book_rs = $book_rs->the_ultimate_books->by_author($author);
-my @books = $book_rs->all;</pre>
- </div>
-
- <div class="slide">
- <h1>ResultSets: Chaining</h1>
-<pre>$book_rs = $schema->resultset('Book')
- ->the_ultimate_books
- ->by_author($author);</pre>
-or
-
-<pre>my $book_rs = $schema->resultset('Book')
- ->the_ultimate_books;
-$book_rs = $book_rs->by_author($author);</pre>
-<pre># Debug (SQL):
-
-# SELECT me.id, me.title, me.date_published, me.author
-# FROM books me
-# WHERE ( ( ( author = ? ) AND ( title LIKE ? ) ) ): '5', '%42%'
-# WHERE ( ( ( author = ? ) AND ( title LIKE ? ) ) ): '5', '%42%'</pre>
- </div>
-
- <div class="slide">
- <h1>ResultSets: Chaining</h1>
-<pre>my $rs = $book_rs
- ->category('childrens')
- ->by_author($author)
- ->published_after('1812')
- ->first_page_contains('once upon')
- ->rating_greater_than(4);
-
-my @books = $rs->all;</pre>
- </div>
-
- <div class="slide">
- <h1>overloading before new record</h1>
- <pre>package Foo::Schema::Result::Author;
-use base 'DBIx::Class::Core';
-
-sub new {
- my ( $class, $attrs ) = @_;
- # Mess with $attrs
- my $new = $class->next::method($attrs);
- return $new
-}
-
-1;</pre>
-
- <div class="slide">
- <h1>Relationships</h1>
- </div>
-
- <div class="slide">
- <h1>Multiple Authors</h1>
- <p>We want to allow a book to be by more than one author</p>
+sub good {
+ $_[0]->search({
+ rating => { '>=' => 4 },
+ })
+};
+sub cheap {
+ $_[0]->search({
+ price => { '<=' => 5}
+ })
+};
+# ...
+1;
+ </pre>
+ <ul class="incremental">
+ <li>All searches should be ResultSet methods</li>
+ <li>Name has obvious meaning</li>
+ </ul>
</div>
<div class="slide">
- <h1>a few relationships</h1>
- <img src="img/afewrels.png" />
+ <h1>ResultSet method in Action</h1>
+ <pre>$schema->resultset('Book')->good</pre>
</div>
<div class="slide">
- <h1>Join Table</h1>
-<pre>CREATE TABLE author_and_books(
- book_id int(8),
- author_id int(8),
- foreign key (book_id) references books(id),
- foreign key (author_id) references authors(id)
-) engine = InnoDB DEFAULT CHARSET=utf8;
-
-ALTER TABLE `books` DROP `author_id`;</pre>
+ <h1>ResultSet Chaining</h1>
+<pre>$schema->resultset('Book')
+ ->good
+ ->cheap
+ ->recent
+</pre>
</div>
<div class="slide">
- <h1>has_many</h1>
- <img src="img/hasmany1.png" />
+ <h1>search_related</h1>
+ <pre>*get example from work*</pre>
</div>
<div class="slide">
- <h1>has_many</h1>
-<pre>package Foo::Schema::<strong>Result::Book</strong>;
+ <h1>bonus rel methods</h1>
+<pre>my $book = $author->create_related(
+ <strong>books</strong> => {
+ title => 'Another Discworld book',
+});
-__PACKAGE__->has_many( author_and_books =>
- 'Foo::Schema::Result::Author_Book', 'book_id'
-);
+my $book2 = $pratchett->add_to_<strong>books</strong>({
+ title => 'MOAR Discworld book',
+});</pre>
+ <ul class="incremental">
+ <li>Automaticaly fills in foreign key for you</li>
+ </ul>
</div>
<div class="slide">
- <h1>belongs_to</h1>
- <img src="img/belongsto1.png" />
- </div>
+ <h1>Excellent Transaction Support</h1>
+<pre>$schema->txn_do(sub {
+ ...
+});
- <div class="slide">
- <h1>belongs_to</h1>
-<pre>package Foo::Schema::<strong>Result::Author_Book</strong>;
+my $guard = $schema->txn_scope_guard;
+# ...
+$guard->commit;
-__PACKAGE__->belongs_to(
- book =>
- 'Foo::Schema::Result::Book', 'book_id'
-);
+$schema->txn_begin; # <-- low level
+# ...
+$schema->txn_commit;
</pre>
</div>
<div class="slide">
- <h1>same for Authors</h1>
- <img src="img/authors.png" />
+ <h1>InflateColumn</h1>
+<pre>package Foo::Schema::Result::Book;
+use base 'DBIx::Class::Core';
+# Result code here
+__PACKAGE__->load_components('InflateColumn');
+use DateTime::Format::MySQL;
+__PACKAGE__-><strong>inflate_column</strong>(
+ <strong>date_published</strong> => {
+ inflate => sub { DateTime::Format::MySQL->parse_date(shift) },
+ deflate => sub { shift->ymd},
+ },
+);
+# Automatic see: DBIx::Class::InflateColumn::DateTime</pre>
</div>
<div class="slide">
- <h1>many_to_many</h1>
- <img src="img/m2m.png" />
+ <h1>InflateColumn: deflation</h1>
+<pre>$book->date_published(DateTime->now);
+$book->update;</pre>
</div>
<div class="slide">
- <h1>many_to_many</h1>
- <pre>package Foo::Schema::<strong>Result::Book</strong>;
-use base 'DBIx::Class::Core';
-
-__PACKAGE__->many_to_many(
- authors => 'author_and_books', 'author'
-);
+ <h1>InflateColumn: inflation</h1>
+<pre>my $date_published = $book->date_published;
+print $date_published->month_abbr;</pre>
-1;
-</pre>
+<strong><em>Nov</em></strong>
</div>
<div class="slide">
- <h1>many_to_many</h1>
- <pre>package Foo::Schema::<strong>Result::Book</strong>;
+ <h1>FilterColumn</h1>
+<pre>package Foo::Schema::Result::Book;
use base 'DBIx::Class::Core';
+# Result code here
+__PACKAGE__->load_components('FilterColumn');
-__PACKAGE__->many_to_many(
- authors <strong># Accessor name</strong>
- => "author_and_books", <strong># has_many</strong>
- 'author' <strong># foreign relationship name</strong>
+__PACKAGE__-><strong>filter_column</strong>(
+ <strong>length</strong> => {
+ to_storage => 'to_metric',
+ from_storage => 'to_imperial',
+ },
);
-1;</pre>
+sub to_metric { $_[1] * .305 }
+sub to_imperial { $_[1] * 3.28 }
+# Automatic see: DBIx::Class::InflateColumn::DateTime</pre>
</div>
<div class="slide">
- <h1>many_to_many</h1>
- <pre>package Foo::Schema::Result::Author;
-use base 'DBIx::Class::Core';
-
-__PACKAGE__->many_to_many(
- "books" <strong># Accessor Name</strong>
- => "author_and_books", <strong># has_many accessor_name</strong>
- 'book' <strong># foreign relationship name</strong>
-);
-
-1;
+ <h1>ResultSetColumn</h1>
+<pre>my $rsc = $schema->resultset('Book')->get_column('price');
+$rsc->min;
+$rsc->max;
+$rsc->sum;
</pre>
</div>
<div class="slide">
- <h1>Using many_to_many</h1>
- <pre>#!perl
-use Foo::Schema;
-my $schema = Foo::Schema->connect(...);
-my $author_rs = $schema->resultset('Authors');
-my $author = $author_rs->search({
- name => 'Douglas Adams',
-})->single;
-$author->add_to_books({
- title => 'A new book',
-});</pre>
- </div>
-
- <div class="slide">
- <h1>using many_to_many</h1>
- <pre>my $author = $author_rs->search({
- name => 'Douglas Adams',
-})->single;
-<strong>$author->add_to_books({
- title => 'A new book',
-});</strong>
-
-# SELECT me.id, me.name FROM authors me
-# WHERE ( name = ? ): 'Douglas Adams';
-# INSERT INTO books (title) VALUES (?): 'A new book';
-# INSERT INTO author_and_books (author, book)
-# VALUES (?, ?): '5', '2';</pre>
- </div>
-
- <div class="slide">
- <h1>using many_to_many</h1>
- <pre>$author->add_to_books($book);
-
-$book->add_to_authors($author_1);
-$book->add_to_authors($author_2);</pre>
- </div>
-
- <div class="slide">
- <h1>errors</h1>
- <p>Read them closely!</p>
- </div>
-
- <div class="slide">
- <h1>error messages</h1>
-<pre>DBIx::Class::Schema::Loader::connection(): Failed to load external
-class definition for 'Foo::Schema::Result::Authors': Can't locate object
-method "many_to_many" via package "Foo::Schema::Result::Author" at
-lib/Foo/Schema/Result/Authors.pm line 9.Compilation failed in require at
-/Library/Perl/5.8.8/DBIx/Class/Schema/Loader/Base.pm line 292.</pre>
- </div>
-
- <div class="slide">
- <h1>error messages</h1>
-<pre>DBIx::Class::Schema::Loader::connection(): Failed to load external
-class definition for 'Foo::Schema::Result::Authors': Can't locate object
-method "many_to_many" via package "Foo::Schema::<strong>Result::Author</strong>" at
-lib/Foo/Schema/<strong>Result/Authors.pm</strong> line 9.Compilation failed in require at
-/Library/Perl/5.8.8/DBIx/Class/Schema/Loader/Base.pm line 292.</pre>
- </div>
-
- <div class="slide">
- <h1>errors</h1>
- <ul>
- <li>Turn on debugging</li>
- <li>Read error messages (sometimes useful!)</li>
- <li>Check field names</li>
- <li>Check package names</li>
- <li>Check which database you are connected to (dev/test/live?) - repeat above</li>
+ <h1>Aggregates</h1>
+<pre>my @res = $rs->search({}, {
+ select => [qw(price genre), { max => price }, { avg => price }],
+ as => [qw(price genre max_price avg_price)],
+ group_by => [qw(price genre)],
+});
+for (@res) {
+ say $_->price . ' ' . $_->genre;
+ say $_->get_column('max_price');
+ say $_->get_column('min_price');
+}</pre>
+ <ul class="incremental">
+ <li>Careful, get_column can basicaly mean THREE things</li>
+ <li>private for get what you should use an accessor for</li>
+ <li>public for what there is no accessor for</li>
+ <li>public for get resultset column (prev slide)</li>
</ul>
</div>
<div class="slide">
- <h1>LOTS more Features</h1>
- <ul>
- <li>FilterColumn</li>
- <li>Transactions</li>
- <li>HashRefInflator</li>
- <li>Subqueries</li>
- <li>ResultSetColumn</li>
- <li>Aggregate Queries</li>
+ <h1>HRI</h1>
+<pre>$rs->search({}, {
+ result_class => 'DBIx::Class::ResultClass::HashRefInflator',
+});</pre>
+ <ul class="incremental">
+ <li>Easy on memory</li>
+ <li>Mega fast</li>
+ <li>Great for quick debugging</li>
+ <li>Great for performance tuning (we went from 2m to < 3s)</li>
</ul>
</div>
<div class="slide">
- <h1>bonus slides!</h1>
- </div>
+ <h1>Subquery Support</h1>
+<pre> my $inside_rs = $schema->resultset('Artist')->search({
+ name => [ 'Billy Joel', 'Brittany Spears' ],
+});
- <div class="slide">
- <h1>Template Toolkit</h1>
- <ul>
- <li><pre>[% author.books.count %]</pre> not working?</li>
- <li>TT all methods are called in list context</li>
- <li><pre>[% author.books<strong>_rs</strong>.count %]</pre> scalar context</li>
- <li><em>Available for all relationships</em></li>
- </ul>
+my $rs = $schema->resultset('CD')->search({
+ artist_id => { -in => $inside_rs->get_column('id')->as_query },
+});</pre>
</div>
<div class="slide">
- <h1>Catalyst</h1>
- <pre>package Your::App::Model::<strong>Foo</strong>;
-use base qw(<strong>Catalyst::Model::Schema::Schema</strong>);
-
-use strict;
-use warnings;
-
-__PACKAGE__->config(
- schema_class => '<strong>Foo::Schema</strong>',
-);
+ <h1>Bare SQL w/ Placeholders</h1>
+<pre>$rs->update({
+ price => \"price + $inc", # !!! SQL INJECTION VECTOR
+});
-1;</pre>
- <p>Keep your Schema in a <em>separate</em> package from your Catalyst application</p>
+$rs->update({
+ price => \['price + ?', [inc => $inc]],
+});
+</pre>
</div>
<div class="slide">
- <h1>Catalyst</h1>
-<pre>sub action_name : Local {
- my ($self, $c) = @_;
-
- my $schema = $c->model('Schema::Foo');
- my $author_rs = $schema->resultset('Authors');
-
-}
-
-1;</pre>
+ <h1>Questions?</h1>
</div>
+ <div class="slide">
+ <h1>END</h1>
+ </div>
</div>
</body>
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