Introduction to JCR and Apache Jackrabbi

Introduction to JCR and Apache Jackrabbit Jukka Zitting ApacheCon US 2008

JCR Crash Course!

import javax.jcr.*; import org.apache.jackrabbit.core.TransientRepository; repository = new TransientRepository (); println repository. getDescriptor (Repository.REP_NAME_DESC);

Jackrabbit

Sessions and Workspaces

credentials = new SimpleCredentials( “username”, “password”. toCharArray ()); session = repository. login (credentials) workspace = session. getWorkspace () println workspace. getName ()

default

println workspace. getAccessibleWorkspaceNames ()

{ “default” }

Node Hierarchy

root = session. getRootNode (); foo = root. addNode ("foo"); bar = root. addNode ("bar"); baz = bar. addNode ("baz"); println baz. getPath ();

/bar/baz

Properties

a = foo. setProperty ("A", "abc"); b = foo. setProperty ("B", "123"); println b. getPath ();

/foo/B

println b. getLong () + 321;

444

Transient State

other = repository. login (); println other. itemExists ("/foo");

false

session. save (); println other. itemExists ("/foo");

true

XPath Query

qm = workspace. getQueryManager (); query = qm. createQuery ( "//*[A = 'abc']", "xpath"); nodes = query. execute (). getNodes (); println nodes. nextNode (). getPath ();

/foo

SQL Query

query = qm. createQuery ( "SELECT * FROM nt:base” + “ WHERE A = 'abc'", "sql"); rows = query. execute (). getRows (); println rows. nextRow () . getValue ("jcr:path"). getString ()

/foo

And Remember!

session. logout () other. logout ()

Content Modeling nt:hierarchyNode nt:folder nt:file nt:linkedFile nt:resource

Bottom-Up Modeling my:resource > nt:resource

codec (string)
bitrate (long)

my:tune > nt:file

artist (string)
release date (date)

my:album > nt:folder

artist (string)
release date (date)

my:review > nt:file

author (string)
star rating (long)

Top-Down Modeling Album Images Tune Band Label Label Tune Album Reviews Label Band Reviews Tune Images

Finding Content by Reference Rock tags tunes Tune Tune Classic Top 10 playlists Picks link link link

Finding Content by Search Looking for XPath SQL Latest releases /jcr:root/my:tunes//element(*,my:tune) [@released > xs:dateTime(‘…’)] SELECT * FROM my:tune WHERE jcr:path LIKE ‘/my:tunes/%’ AND released > DATE ‘…’ Reviews with keywords /jcr:root/my:tunes//element(*,my:review) /jcr:content[jcr:contains(.,’…’)] SELECT * FROM my:review WHERE jcr:path LIKE ‘/my:tunes/%’ AND CONTAINS(*,‘…’)

Versioning and Publishing Version store Live Staging

http://jackrabbit.apache.org/