Ruby 01 LightningTalk
MySQL
O/R
makoto kuwata
http://www.kuwata-lab.com/
copyright(c) 2008 kuwata-lab.com all rights reserved.
1

1
MySQL
copyright(c) 2008 kuwata-lab.com all rights reserved.
2

MySQL/Ruby
‣ MySQL/Ruby
• Ruby MySQL
• :
• Rails
• http://www.tmtm.org/mysql/ruby/
copyright(c) 2008 kuwata-lab.com all rights reserved.
3

‣ Mysql::Result#fetch()
•
‣ Mysql::Stmt#fetch()
• 3.14 3.14000010490417
• timestamp Time Mysql::Time
copyright(c) 2008 kuwata-lab.com all rights reserved.
4

motto-mysql
‣ motto-mysql
• MySQL/Ruby
• http://motto-mysql.rubyforge.org/
http://github.com/kwatch/motto-mysql
• :
$ which mysql_config
/usr/local/mysql/bin/mysql_config
$ sudo gem install motto-mysql
copyright(c) 2008 kuwata-lab.com all rights reserved.
5

‣ Mysql::Result
fetch
• #fetch_as_hash()/array()
• #fetch_all_as_hashes()/arrays()
‣ Mysql::Stmt 3.14 3.14
timestamp Time
• #fetch_as_hash()/array()
• #fetch_all_as_hashes()/arrays()
copyright(c) 2008 kuwata-lab.com all rights reserved.
6

‣ MySQL::Result#fetch_as(klass)
MySQL::Result#fetch_all_as(klass)
• klass
• Hash fetch
copyright(c) 2008 kuwata-lab.com all rights reserved.
7

require 'mysql'
require 'motto_mysql'
conn = Mysql.connect('host', 'user', 'pass', 'db')
sql = 'select * from users'
result = conn.query(sql)
p result.fetch_as(User) #=> User object
result.fetch_all_as(User) do |user|
p user #=> User object
end
copyright(c) 2008 kuwata-lab.com all rights reserved.
8

DB systime usertime
Result#each ( ) 4.79 1.08 3.83
Result#each ( ) 4.84 1.08 5.12
Hash fetch +
Result#each ( +new) 4.86 1.09 6.99 +
Result#each_hash ( ) 4.80 1.08 5.30 Object.new
Result#each_hash ( ) 4.87 1.09 7.66
Resutl#each_hash ( +new) 4.90 1.11 10.45
Result#fetch_all_as_arrays() 4.76 1.07 3.57
Result#fetch_all_as_hashes() 4.82 1.08 5.00 , usertime
Result#fetch_all_as(klass) 4.80 1.08 4.74
1/2, 2/3
0 5 10 15 20
(sec)
copyright(c) 2008 kuwata-lab.com all rights reserved.
9

DB systime usertime
Result#each ( +new) 4.86 1.09 6.99
Resutl#each_hash ( +new) 4.90 1.11 10.45
Result#fetch_all_as(klass) 4.80 1.08 4.74 DB fetch
Java
Java1.5+MySQL Connector5.1.5 5.34
0.80 6.28
Python2.5.2+MySQLdb(dict) 4.87 1.28 9.05
Python2.5.2+MySQLdb(tuple) 4.81 1.27 5.97
0 5 10 15 20
(sec)
copyright(c) 2008 kuwata-lab.com all rights reserved.
10

‣ integer(1) boolean
true/false
‣ '0000-00-00 00:00:00' Time Date
(ArgumentError)
‣ Ruby on Rails
copyright(c) 2008 kuwata-lab.com all rights reserved.
11

2
O/R
copyright(c) 2008 kuwata-lab.com all rights reserved.
12

Kwery
‣ Kwery … O/R
• CGI
• Model class
• Join-less
• MySQL motto-mysql
• http://github.com/kwatch/kwery/
copyright(c) 2008 kuwata-lab.com all rights reserved.
13

class User
include Kwery::Model create table
DSL
create_table('users') do |t|
t.integer(:id) {|c| c.primary_key.serial }
t.string(:name) {|c| c.not_null.unique }
t.timestamp(:created_at) {|c|
c.default(:current_timestamp) }
end
end # User.to_sql SQL
copyright(c) 2008 kuwata-lab.com all rights reserved.
14

# Query
conn = Mysql.connect('host', 'user', 'pass', 'db')
q = Kwery::Query.new(conn)
#
# Hash
user = q.get(User, :id, 7)
# where order_by method chain
users = q.get_all(User) {|c|
c.where('age >', 20).order_by(:name) }
copyright(c) 2008 kuwata-lab.com all rights reserved.
15

: Join
‣ Join-less programming ( : )
• select * from users, groups where
user.group_id = groups.id;
select * from users;
select * from groups where id in (...);
• 1+N 2
users = q.get_all(User) #=> select * from users
q.bind_references_to(users, Group, 'team_id', 'team')
#=> select * from groups where id in (...)
copyright(c) 2008 kuwata-lab.com all rights reserved.
16

Web !
http://www.github.com/kwatch/kwery/
copyright(c) 2008 kuwata-lab.com all rights reserved.
17

thank you
copyright(c) 2008 kuwata-lab.com all rights reserved.
18