Slides from the Euruko 2009 talk on DataObjects, the unified database access API for Ruby

1. DataObjects

2. Dirkjan Bussink

15. © Jon Truran

17. Text
Sorry for the photoshop skills...

18. connection = Mysql.real_connect(quot;localhostquot;, quot;rootquot;, quot;quot;, quot;do_testquot;)
reader = connection.query(quot;SELECT login, password FROM usersquot;)
reader.each do |row|
row[0] => 'dbussink'
row[1] => 'secret'
end
connection = OCI8.new(quot;rootquot;, quot;quot;, quot;localhostquot;)
reader = connection.exec(quot;SELECT login, password FROM usersquot;)
while row = reader.fetch
row[0] => 'dbussink'
row[1] => 'secret'
end
connection = PGconn.connect(quot;localhostquot;, 5432, nil, nil, quot;do_testquot;, quot;rootquot;, quot;quot;)
reader = connection.exec(quot;SELECT login, password FROM usersquot;)
for i in 0...reader.ntuples do
reader.getvalue(i,0) => 'dbussink'
reader.getvalue(i,1) => 'secret'
end
connection = SQLite3::Database.new(quot;do_test.dbquot;)
reader = connection.execute(quot;SELECT login, password FROM usersquot;)
reader[0][0] => 'dbussink'
reader[0][1] => 'secret'

19. It’s all about the API

20. connection = DataObjects::Connection.new(quot;mysql://root@localhost/do_testquot;)
command = connection.create_command(quot;INSERT INTO users (login) VALUES ('dbussink')quot;)
result = command.execute_non_query
result.affected_rows => 1
result.insert_id => 2

21. connection = DataObjects::Connection.new(quot;mysql://root@localhost/do_testquot;)
command = connection.create_command(quot;SELECT id, login, created_at FROM usersquot;)
reader = command.execute_reader
reader.fields => ['id', 'login', 'created_at']
while reader.next!
reader.values => [1, 'dbussink', Date.civil(2009, 5, 10)]
end

22. Typecasting

23. connection = DataObjects::Connection.new(quot;mysql://root@localhost/do_testquot;)
command = connection.create_command(quot;SELECT id, login, created_at FROM usersquot;)
command.set_types(String, String, String)
reader = command.execute_reader
reader.fields => ['id', 'login', 'created_at']
while reader.next!
reader.values => ['1', 'dbussink', '2009-5-10']
end

24. connection = DataObjects::Connection.new(quot;mysql://root@localhost/do_testquot;)
command = connection.create_command(quot;SELECT id, login, password FROM users WHERE login = ?quot;)
reader = command.execute_reader('dbussink')
reader.fields => ['id', 'login', 'created_at']
while reader.next!
reader.values => [1, 'dbussink', Date.civil(2009, 5, 10)]
end

25. Float
String
Integer
Date
BigDecimal
TrueClass
DateTime

26. Shared specs

27. describe DataObjects::Postgres::Command do
it_should_behave_like 'a Command'
it_should_behave_like 'a Command with async'
end

28. Implement standard
Command API
describe DataObjects::Postgres::Command do
it_should_behave_like 'a Command'
it_should_behave_like 'a Command with async'
end

29. Implement standard
Command API
describe DataObjects::Postgres::Command do
it_should_behave_like 'a Command'
it_should_behave_like 'a Command with async'
end
Command is green
thread friendly

30. describe 'DataObjects::Postgres with BigDecimal' do
it_should_behave_like 'supporting BigDecimal'
it_should_behave_like 'supporting BigDecimal autocasting'
end

31. Deserialize and
serialize BigDecimal
describe 'DataObjects::Postgres with BigDecimal' do
it_should_behave_like 'supporting BigDecimal'
it_should_behave_like 'supporting BigDecimal autocasting'
end

32. Deserialize and
serialize BigDecimal
describe 'DataObjects::Postgres with BigDecimal' do
it_should_behave_like 'supporting BigDecimal'
it_should_behave_like 'supporting BigDecimal autocasting'
end
Database provides
a mapped type (DECIMAL)

34. How can I help?

35. Improved transactions

36. Prepared statements

37. Specs!
And documentation too :)

38. ActiveRecord adapter