Database version control without pain - the PHP Barcelona version

PHP Barcelona Conference - 30th October 2010
Harrie Verveer
Database Version Control Without Pain
zaterdag 30 oktober 2010

Oh hai!
2
HarrieVerveer
aka Hairy
Dutchy
I live in a town called “Goes”
Software engineer at
ibuildings since 2004
Vlissingen (Flushing) ofﬁce

http://www.mediawiki.org/wiki/File:Europe_satellite_orthographic.jpghttp://www.mediawiki.org/wiki/File:Europe_satellite_orthographic.jpg

Database Version Control
What’s the problem?
8

http://www.sxc.hu/photo/1207911

http://en.wikipedia.org/wiki/File:STS120LaunchHiRes.jpg

http://www.ﬂickr.com/photos/kt/1217157/

Why Database Version Control
13

Simple Patching Strategy
14
The basic idea

Simple patching strategy
15

Example patch file
16
patch-001.sql

Simple patching strategy
18
Development
Write code
Write DB patches
Apply patches to own DB
Update
Apply patches Commit

Fixing patches
19
patch-002.sql

Fixing patches
20
patch-003.sql

Fixing patches
20
patch-003.sql
Never modify a patch file once
it’s under version control

Undo patch files
21
undo-001.sql

http://www.freefoto.com/preview/41-07-7

Bonus points
Install.sql
23

Bonus points
Initial dummy content
24

Automating the process
Faster & Safer
27

Typical patch script
28

Typical patch script
29
update.sh

Branches
Merge problems
30

Branches
31
Trunk
patch-001.sql
patch-002.sql
patch-003.sql

Trunk
patch-001.sql
patch-002.sql
patch-003.sql
create branch
patch-004.sql
patch-005.sql
patch-004.sql
patch-005.sql
Branch A
Merge
Branches
32

Trunk
patch-001.sql
patch-002.sql
patch-003.sql
create branch
patch-004.sql
patch-005.sql
patch-004.sql
patch-005.sql
Branch A
Merge
Branches
32
patch-006.sql
patch-007.sql

Branches
33
Trunk
patch-001.sql
patch-002.sql
patch-003.sql
create branch
patch-004.sql
patch-005.sql
patch-004.sql
patch-005.sql
Branch B
create branch
patch-002.sql
patch-003.sql
Branch A
Merge
patch-004.sql
Merge
patch-005.sql
Merge
Merge

Separate sequence
db/patches/trunk/
patch-001.sql
patch-002.sql
patch-003.sql
34
db/patches/branchA/
patch-001.sql
patch-002.sql

Separate sequence
db/patches/trunk/
patch-001.sql
patch-002.sql
patch-003.sql
34
db/patches/branchA/
patch-001.sql
patch-002.sql
Trunk version 3
BranchA version 2

Patchfile naming
35
patch_20100611_1430.sql

Patch log
36

There is no silver bullet
Why it can’t exist
38

http://www.ﬂickr.com/photos/eschipul/4160817135/

Comparing tables
40
Table in DB 1Table in DB 1
column 1 int
column 2 varchar(255)
column 1 int

Comparing tables
41
id int
name varchar(255)
city varchar(255)
id int
name varchar(255)
website varchar(255)

Comparing tables
42
id int
ﬁrstname varchar(255)
lname varchar(255)
id int
ﬁrstname varchar(255)
lastname varchar(255)

43
To synchronize two database
structures without unexpected
dataloss, communicating all steps
needed to get from A to B is
inevitable.

Phing & DB Deploy
44

Phing & DB Deploy
45Cartoon by Oliver Widder - http://geekandpoke.typepad.com/

46
http://phing.info/

Phing
47

DB Deploy
49

Phing & DB Deploy
50

DB Deploy
51
db/patches/1-create_user_table.sql

DB Deploy
52
changelog table:

DB Deploy
53
PHP

DB Deploy
54
SQL

DB Deploy
55
Features

Liquibase
The most complete solution I know
56

Liquibase
57
www.liquibase.org

Liquibase
58

Liquibase
59

Liquibase
60

Liquibase
Updating
Reverting
Tagging
Generate XML
Diff
61

Liquibase
Branches
63

Liquibase
DBMS Support
64

Liquibase
Documentation
65

Liquibase
Java
66

Akrabat DB Schema Manager
Zend Framework specific solution
67

Zend Framework
Proposed by Rob Allen in 2006
Recently implemented
http://github.com/akrabat/Akrabat
68

Writing the patch
69
scripts/migrations/001-CreateUserTable.php

Writing the patch
70
scripts/migrations/001-CreateUserTable.php

PHP Patches
71

Easy syntax if you know ZF
72

Easy to install, easy to use
73

Branch merging
74

Doctrine Migrations
Doctrine ORM specific solution
75

Doctrine Migrations
76
http://www.doctrine-project.org/

Doctrine Migrations Patch
77

Doctrine Migrations
78
Update-to-version
./doctrine migrate

YAML
79

YAML
79
./doctrine generate-migrations-diff

Doctrine Migrations
80

Doctrine Migrations
81
Generate patches

Doctrine Migrations
82
Useful if you’re already using Doctrine
ORM

Summary
83

Summary
Patchfiles
• Automating
• Branch merging
• Why there is no silver bullet
Phing + DB Deploy
http://phing.info
http://dbdeploy.com
Liquibase
http://www.liquibase.org
84
http://akrabat.com
http://github.com/akrabat/Akrabat
Doctrine Migrations
http://www.doctrine-project.org

Questions ?
85

86
Contact me
Harrie Verveer
Software Engineer at Ibuildings
Blog:
www.harrieverveer.com
E-mail:
harrie@ibuildings.nl
Skype:
harrie-ibuildings
Twitter:
@harrieverveer

Database version control without pain - the PHP Barcelona version

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