- 追加された行はこの色です。
- 削除された行はこの色です。
* SELECT [#g8767459]
http://search.cpan.org/perldoc?DBIx::Class::ResultSet#search
** FIND [#he6a13f8]
プライマリキーで検索する。見つからないときは、undefが返ってくる。
my $cd = $schema->resultset('CD')->find(5);
** SEARCH [#u5289657]
$rs->search({ age => 20 }) # WHERE age = 20 =
$rs->search({ age => {'>' => 20} }) # WHERE age > 20 >
$rs->search({ age => undef }) # WHERE age is NULL NULL
$rs->search([{ age => 20 },{ age => 30 }]) # WHERE age = 20 OR age = 30 OR
$rs->search_like({ name => '%taro%' }) # WHERE name LIKE '%taro%' LIKE
$rs->search({id => {-in => \@ids}}) # WHERE id in (1,2,3..) IN
$rs->search({ age => 20 }) # WHERE age = 20 =
$rs->search({ age => {'>' => 20} }) # WHERE age > 20 >
$rs->search({ age => undef }) # WHERE age is NULL NULL
$rs->search([{ age => 20 },{ age => 30 }]) # WHERE age = 20 OR age = 30 OR
$rs->search({ age => 20, name => 'taro }) # WHERE age = 20 AND name = 'taro' AND
$rs->search({ 'age' => { '>' => 10, '<' => 20 }}) # WHERE age > 10 AND age < 20 AND 同じカラムを使う場合
$rs->search_like({ name => '%taro%' }) # WHERE name LIKE '%taro%' LIKE
$rs->search({id => {-in => \@ids}}) # WHERE id in (1,2,3..) IN
** ORDER BY [#h7a857b5]
$rs->search({},{
order_by => [ 'name', { -desc => 'id' } ] # ORDER BY name ASC, id DESC
}); # 'name' は { -asc => 'name' } の省略形
http://search.cpan.org/perldoc?SQL::Abstract#ORDER_BY_CLAUSES
** GROUP BY [#g35ffed7]
$rs->search({},{
select => ['name',{sum=>'point'}],
as => ['name','point'],
group_by => ['name'],
});
$point = $rs->next->get_column('point');
** COUNT() [#e0e28000]
$rs = $rs->search();
print $rs->count;
↓SELECT COUNT(DISTINCT name) FROM user
$rs = $rs->seach({},{
select => [ { count => { distinct => 'name' } } ],
as => ['count'],
});
print $rs->next->get_column('count');
** LIMIT / OFFSET [#y76174dc]
$rs->search({},{ order_by => 'id' })->slice(0,20); # slice($offset,$limit)
** テーブル結合 [#w4bf664b]
*** JOIN (3つのテーブル) [#s1746a0e]
SELECT order.* FROM order JOIN order_detail ON order.id = order_detail.order_id JOIN goods order_detail.goods_id = goods.id
WHERE goods.name = 'book'
$rs->search({
"goods.name" => 'book',
},{
join => {order_detail => 'goods'}
});
*** 自己結合 [#c1729252]
SELECT XXX FROM category cate1 JOIN category cate2 ON cate1.parent_category_id = cate2.category_id
$rs = $rs->search({},
{
from => [
{ cate1 => 'category' },
[ { cate2 => 'category' }, { 'cate1.parent_category_id' => 'cate2.category_id' } ]
]
}
);
*** PREFETCH [#r9685ba3]
$rs->search(undef,{prefetch => 'user', join => 'user'});
ジョインするテーブルをjoin=>'TABLE名'で明示する事。
** 特定のカラムのみSELECT(AS演算子)[#hf28370c]
$rs->search({},{
select => [ 'name', 'age' ],
as => [ 'name', '年齢'],
});
print $r->name, $r->get_column('年齢');
** DB関数 [#r24f677f]
*** DBの関数を比較の対象に使う [#zeced0ab]
$rs->search({"date_part('year', age(now(), birth_date))" => { '<=' => 18 } }); # 年齢が18歳以下
# date_part()とage()はPostgreSQLの関数
http://search.cpan.org/perldoc?DBIx::Class::Manual::Cookbook#Using_SQL_functions_on_the_left_hand_side_of_a_comparison
*** DBの関数を比較の値に使う [#z004db0c]
不等号「>」も含めて、スカラリファレンスにする。
$rs->search( { start_day => \' > now()' } );