1. Java Development Go.. Go… JVM!

2. Library Choices Raw MongoDB Driver Map<String, Object> view of objects Rough but dynamic Morphia (type-safe mapper) POJOs Annotation based (similar to JPA) Syntactic sugar and helpers Others Code generators, other jvm languages

3. MongoDB Java Driver BSON Package Types Encode/Decode DBObject (Map<String, Object>) Nested Maps Directly encoded to binary format (BSON) MongoDB Package Mongo DBObject (BasicDBObject/Builder) DB/DBColletion DBQuery/DBCursor

4. BSON Package Types int and long Array/ArrayList String byte[] – binData Double (IEEE 754 FP) Date (secs since epoch) Null Boolean JavaScript String Regex

5. MongoDB Package Mongo Connection, ThreadSafe WriteConcern* DB Auth, Collections getLastError() Command(), eval() RequestStart/Done DBCollection Insert/Save/Find/Remove/Update/FindAndModify ensureIndex

6. Simple Example DBCollectioncoll = new Mongo().getDB(“test”); coll.save( new BasicDBObjectBuilder(“name”, “scott”). append(“sex”, “male”). append(“height”, 178)).get());

7. Simple Example, Again DBCollectioncoll = new Mongo().getDB(“test”); Map<String, Object> fields = new … fields.add(“name”, “scott”); fields.add(“sex”, “male”); fields.add(“height”, 178); coll.insert(new BasicDBObject(fields));

8. DBObject <-> (B/J)SON {name:”scott”, sex:“male”, height: 178 } new BasicDBObjectBuilder() .append(“name”, “scott”) .append(“sex”, “male”) .append(“height”, 178) .get(); String name = (String)dbObj.get(“name”);

9. JSON.parse(…) DBObjectdbObj = JSON.parse(“ {‘name’:’scott’,‘height’: 178, ‘sex’:’male’} ”);

10. Lists DBObjectdbObj = JSON.parse(“ {‘name’:’scott’,height: 178, sex:’male’} ”); List<String> activities = new … activities.add(“mongodb”); activities.add(“java”); dbObj.put(“activities”, activities); {…, activities: [‘mongodb’, ‘java’]}

11. Maps of Maps Can represent object graph/tree Always keyed off String (field)

12. Morphia: MongoDB Mapper Maps POJO Type-safe Access Patterns: DAO/Datastore/??? Data Types Performs well JPA like Many concepts came from Objectify (GAE)

13. Annotations @Entity(“collectionName”) @Id @Transient (not transient) @Indexed(…) @Property(“fieldAlias”) @AlsoLoad({aliases}) @Reference @Serialized [@Embedded]

14. Lifecycle Events @PrePersist @PreSave @PostPersist @PreLoad @PostLoad EntityListeners EntityInterceptor

15. Basic POJO @Entity class Person { @Id String name; SexEnum sex; @Indexed Integer height; }

16. Datastore Basics get(class, id) find(class, […]) save(entity, […]) delete(query) getCount(query) update/First(query, upOps) findAndModify/Delete(query, upOps)

17. Add, Get, Delete Person me = new Person(“scott”, Sex.Male, 179) Datastoreds = new Morphia().createDatastore() ds.save(me); Person meAgain = ds.get(Person.class, “scott”) ds.delete(me);

18. Queries Datastoreds = … Query q = ds.createQuery(Person.class); q.field(“height”).greaterThan(155).limit(5); for(Person p : q.fetch()) print(p); Person me = q.field(“name”).startsWith(“sc”).get();

19. Update Datastoreds = … Query q = ds.find(Person.class, “name”, “scott”); UpdateOperationuo = ds.createUpdateOperations(cls) uo.set(“city”, “seattle”).set(“lastUpdated”, new Date()); UpdateResults res = ds.update(q, uo); if(res.getUpdatedCount() > 0) //do something?

20. Update Operations set(field, val) unset(field) inc(field, [val]) dec(field) add(field, val) addAdd(field, vals) removeFirst/Last(field) removeAll(field, vals)

21. Relationships [@Embedded] Loaded/Saved with Entity Update @Reference Stored as DBRef(s) Loaded with Entity Not automatically saved Key<T> (DBRef) Stored as DBRef(s) Just a link, but resolvable by Datastore/Query

22. Questions? Look around… ScottHernandez@gmail.com