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/

Introduction to JCR and Apache Jackrabbi

by Jukka Zitting

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Introduction to JCR and Apache Jackrabbi Presentation Transcript