Midgard2 - Content Repository for mobile applications

Midgard2 Content repository for mobile applications

Henri Bergius Microblogs: @bergie http://bergie.iki.fi

Content Repository Don't invent your own file formats

Content Repository Objects instead of SQL

Content Repository Objects instead of SQL http://xkcd.com/327/

Content Repository Signals about changes

Content Repository Data model is scriptable

Content Repository Synchronization and sharing

With a content repository incredible power is at your disposal

Free Content Repositories • Schema-based, relational • Schema-free • Query Builder • Javascript map/reduce • C, glib, libgda • Erlang • LGPL • Apache License • D-Bus signals • JSON polling via HTTP • Library • Daemon midgard2.org couchdb.apache.org

...and they talk to each other

The Midgard Project • Free software project • Object-Relational since 1999 Mapping, trees, D-Bus signals • Contributors from most European countries • APIs for C, PHP, Python, Vala, Objective-C, ... • Synchronized release model, every 6 months • Linux, Mac, Maemo

Midgard on Maemo 5 Conboy: notes on your phone

Midgard on Maemo 5 Workstreamer: project tracking for N900

Midgard on the web Qaiku.com: conversational microblogging

Getting started with Midgard

Installation • Linux distribution repositories (Ubuntu, Debian, RHEL, OpenSuse etc) on OBS: http://download.opensuse.org/repositories/home:/midgardproject:/mjolnir/ • After that Midgard is just an apt-get install python- midgard2 or apt-get install php5-midgard2 away • Maemo 4 and 5 available in Extras Devel (soon Extras) • On OS X use MacPorts or the ObjC bundle

Objects are defined by MgdSchema  <type name="midgard_person"> <property name="id" type="unsigned integer" primaryfield="id"> <description>Local non-replication-safe database identifier</description> </property> <property name="firstname" type="string" index="yes"> <description>First name of the person</description> </property> <property name="lastname" type="string" index="yes"> <description>Last name of the person</description> </property> <property name="birthdate" type="datetime"> <description>Birth date of the person</description> </property> <property name="email" type="string" index="yes"> <description>Email address of the person</description> </property> </type>

Midgard API for PHP <?php // Load the Midgard2 API extension dl('midgard2.so'); // Set up the repository config $config = new midgard_config(); $config->dbtype = 'SQLite'; $config->database = 'midgardexample'; // this will store to SQLite in ~/.midgard2/data/midgardexample.db // Open a Midgard repository connection $midgard = midgard_connection::get_instance(); $midgard->open_config($config); // Prepare storage for your data midgard_storage::create_base_storage(); midgard_storage::create_class_storage('midgard_person');

Midgard API for PHP // Create a new person object $person = new midgard_person(); $person->firstname = 'Leif'; $person->lastname = 'Eriksson'; $person->create(); // Query system for all persons with lastname "Eriksson" $qb = new midgard_query_builder('midgard_person'); $qb->add_constraint('lastname', '=', 'Eriksson'); $persons = $qb->execute(); foreach ($persons as $person) { echo "{$person->lastname}, {$person->firstname} has GUID {$person- >guid}n"; // Add an email address and update $person->email = 'leif@vinland.no'; $person->update(); }

import antigravity http://xkcd.com/353/

import antigravity # Load the Midgard2 API extension import _midgard as midgard # Set up the repository config configuration = midgard.config() configuration.dbtype = 'SQLite' configuration.database = 'midgardexample' # this will store to SQLite in ~/.midgard2/data/midgardexample.db # Open a Midgard repository connection connection = midgard.connection() connection.open_config(configuration) # Prepare storage for your data midgard.storage.create_base_storage() midgard.storage.create_class_storage('midgard_person')

Midgard API: PHP vs. Python // Create a new person object # Create a new person object $person = new midgard_person(); person = midgard.mgdschema.midgard_person() $person->firstname = 'Leif'; person.firstname = 'Leif' $person->lastname = 'Eriksson'; person.lastname = 'Eriksson' $person->create(); person.create() // Query system for all persons with # Query system for all persons with // lastname "Eriksson" # lastname "Eriksson" $qb = new qb = midgard.query_builder('midgard_person') midgard_query_builder('midgard_person'); qb.add_constraint('lastname', '=', 'Eriksson') $qb->add_constraint('lastname', '=', persons = qb.execute() 'Eriksson'); for person in persons: $persons = $qb->execute(); print "%s, %s has GUID %s" foreach ($persons as $person) % (person.lastname, person.firstname, { person.guid) echo "{$person->lastname},” # Add an email address and update . ” {$person->firstname}” person.email = 'leif@vinland.no' . “ has GUID {$person->guid}n"; person.update() // Add an email address and update $person->email = 'leif@vinland.no'; $person->update(); }

Oh, and Vala too! /* valac --debug --pkg midgard2 -o midgard-vala-example example.vala --vapidir=./ */ using GLib; using Midgard; namespace MidgardValaExample { void main() { Midgard.init(); Midgard.Config config = new Midgard.Config(); config.read_file ("midgard_test", true); Midgard.Connection cnc = new Midgard.Connection(); cnc.open_config (config) Midgard.Object person = new Midgard.Object (cnc, "midgard_person", null); person.set ("firstname", "Leif"); if (person.create()) { string guid; person.get ("guid", out guid); GLib.print ("Created new person identified by GUID %s n", guid); }

any tools you use, Midgard is there

...maybe even in your finger

How about Qt? • Midgard already works in PySide applications • Would be great to have proper Qt support • Anybody want to help with this?

Tree access • Parent-child relations • get_parent() • list_children() • Access via named paths • get_by_path()

Extending objects • Subclasses in MgdSchema <type name="bossa_attendee" extends="midgard_person"> <property name="likesbeer" type="boolean" default="true" /> </type> • Ad-hoc additional properties object.set_parameter('bossa', 'key', 'value') value = object.get_parameter('bossa', 'key') • Binary attachments are also supported • Metadata in repository, file in filesystem • API provides access to filehandles

Midgard MVC Put your content repository on the web

Midgard MVC • Very efficient MVC framework for PHP • Python and D-Bus for background processing • Gettext + intl i18n • TAL templating • Full WebDAV support • Git for packaging and deployment

Midgard MVC Tomboy web synchronization with Midgard

Midgard Runtime

Explore the possibilities of content repositories midgard2.org #midgard on FreeNode @MidgardProject

Midgard2 - Content Repository for mobile applications

by Henri Bergius on Mar 09, 2010

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