My talk from the 33rd Degree conference 2013 in Warsaw

1. Axel Fontaine
FLYWAY
THE AGILE DATABASE MIGRATION
FRAMEWORK FOR JAVA

2. Axel Fontaine @axelfontaine
axelfontaine.com
Software Development Expert
business@axelfontaine.com
• Independent consultant
• Located in Munich
• Founder of Flyway

3. about
questions

4. THE PLAN

9. addAgeToAccount.sql

10. ?
? DB

11. DEV PROD
?
http://digitalcitizen.ca/2009/06/22/simpsons-profile-pics-for-facebook-and-other-applications/

12. Problems for the DBA
• Little understanding of context
• Coordination with app deployer
• Monkey work
• Poor use of expertise
• Poor working hours

13. Problems for DEV
• Late review of changes
• Manual step with friction
• Less likely to change DB structure
• Code and DB diverge
• Incompatible with Continuous Deployment

14. Goals
Goals
• Cooperation between DEV and DBA
• Use full power of the DB
• (Almost) no lock-in
• Automatic so you can forget about it
• Descent working hours for everyone

15. flywaydb.org

16. 3
years old

17. 25 000
downloads in 2012

18. Keeping it simple
(saying no)

19. 6
commands
clean info migrate validate init repair

22. API
Classpath
Metadata Database-
+ Migration
Table specific
Filesystem Execution
Management support
scanning

23. Flyway flyway = new Flyway();
flyway.setDataSource(myDataSource);
flyway.migrate();
mvn flyway:migrate
<flyway:migrate />
flyway.cmd migrate

24. Empty DB

25. Empty DB Version 1

26. Empty DB Version 1 Version 2

27. And what about
the DBA?

28. VS
DML DDL

29. DEV
Migrate PROD
on
Startup

30. Demo

31. When sql isn’t
enough…

33. Java Migrations
public class V1_2__Another_user implements JdbcMigration {
public void migrate(Connection conn) throws Exception {
try (PreparedStatement stmt = conn.prepareStatement(“…")) {
stmt.execute();
}
}
}

34. When greenfield
isn’t an option…

35. Existing Production Database
align
DEV TEST PROD
V1__Dump.sql

36. Existing Production Database
align
DEV TEST PROD
V1__Dump.sql

37. Existing Production Database
align
DEV TEST PROD
migrate
V1__Dump.sql

38. Existing Production Database
align
DEV TEST PROD
migrate
V1__Dump.sql

39. Existing Production Database
align
DEV TEST PROD
migrate
V1__Dump.sql V2__Changes.sql

40. Existing Production Database
DEV TEST PROD
V2__Changes.sql

41. Existing Production Database
DEV TEST PROD
migrate
V2__Changes.sql

42. Existing Production Database
DEV TEST PROD
V2__Changes.sql

43. Backwards-
compatible migrations

47. Example
Rename column
Surname -> Last_Name

48. Surname Last_Name
Surname
ALTER TABLE … RENAME COLUMN

49. Last_Name Last_Name
Surname Last_Name
ALTER TABLE … DROP TRIGGER …
ADD COLUMN Last_Name ALTER TABLE …
UPDATE … SET Last_Name = Surname DROP COLUMN Surname
CREATE TRIGGER …

50. Last_Name
Last_Name
DROP TRIGGER …
ALTER TABLE …
DROP COLUMN Surname

52. Roadmap
2.2 2.3 3.0
Q2 2013 Q3 2013 Q4 2013

53. flywaydb.org

54. 1 day course
Effective Database
Migrations with Flyway
flywaydb.org/support/training.html

55. @axelfontaine
Axel Fontaine axelfontaine.com
Software Development Expert business@axelfontaine.com