Spring Data MongoDB

Slides from Spring Data MongoDB speech given to Szczecin Java User Group on 20 of March 2013

Transcript

1. Spring Data MongoDB
   Maciej Walkowiak
   

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2. Agenda
   NoSQL
   MongoDB
   Spring Data
   Spring Data MongoDB
   

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3. NoSQL
   

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4. NoSQL
   

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5. key-value store document oriented
   column family based graph
   NoSQL
   

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6. NoSQL
   schemaless
   non-relational
   cluster friendly
   Common characteristics
   

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8. document oriented
   full index support
   auto-sharding
   BSON
   map reduce
   non-transactional
   document linking
   geospatial indexes
   

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9. post collection entry
   author collection entry
   {
   "_id" : ObjectId("5146227a0364038863be7514"),
   "title" : "post title",
   "content" : "hello jug",
   "createdAt" : ISODate("2013-03-17T20:07:22.455Z"),
   "tags" : [
   "mongodb",
   "jug",
   "szczecin"
   ],
   }
   {
   "_id" : ObjectId("514622790364038863be7513"),
   "name" : "maciej walkowiak",
   }
   

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10. post collection entry linked with author
    {
    "_id" : ObjectId("5146227a0364038863be7514"),
    "title" : "post title",
    "content" : "hello world coders",
    "createdAt" : ISODate("2013-03-17T20:07:22.455Z"),
    "tags" : [
    "mongodb",
    "jug",
    "szczecin"
    ],
    "author" : DBRef("author", ObjectId("514622790364038863be7513"))
    }
    

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11. post collection entry with embedded author
    {
    "_id" : ObjectId("51476f8d03646a6b3186f081"),
    "title" : "post title",
    "content" : "hello world coders",
    "createdAt" : ISODate("2013-03-18T19:48:29.667Z"),
    "tags" : [
    "mongodb",
    "jug",
    "szczecin"
    ],
    "author" : {
    "name" : "maciej walkowiak",
    "email" : "walkowiak.maciej@yahoo.com"
    }
    }
    

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12. db.post.find();
    db.post.findOne({
    _id: ObjectId("5146227a0364038863be7514")
    });
    db.place.find({ coords : { $near: [-110,32],
    $maxDistance : 10/111.12 } })
    db.post.find({
    tags: "szczecin",
    createdAt: { $gt : ISODate("2013-03-01") }
    })
    

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13. MongoDB + Java
    

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14. MongoDB + Java
    

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15. MongoDB + Java
    Morphia Spring Data MongoDB
    

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16. Spring Data
    

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17. Spring Data
    Same programming model for many databases
    simple things simple, complex things possible
    One API to rule them all - nope
    reduce amount boilerplate code
    

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18. Spring Data
    Same programming model for many databases
    simple things simple, complex things possible
    One API to rule them all - nope
    reduce amount boilerplate code
    

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19. JPA
    MongoDB
    Redis
    Hadoop
    Neo4j
    HBase
    Spring Data
    Supported databases
    

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20. mapping
    template
    repositories
    Map Reduce
    QueryDSL
    Cross-Store
    Spring Data
    

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21. Mapping
    {
    "_id" :
    ObjectId("5149471a0364c59b4e743584"),
    "_class" :
    "pl.maciejwalkowiak.jug.mongo.Post",
    "post_title" : "post title",
    "content" : "hello world coders",
    "createdAt" :
    ISODate("2013-03-20T05:20:26.985Z"),
    "comments" : [ ],
    "tags" : [
    "mongodb",
    "jug",
    "szczecin"
    ],
    "version" : 0,
    "author" : DBRef("user",
    ObjectId("5149471a0364c59b4e743583"))
    }
    

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22. Mapping
    @Document
    public class Post {
    @Id
    private ObjectId id;
    @DBRef
    private User author;
    @Field("post_title")
    private String title;
    private String content;
    @CreatedDate
    private DateTime createdAt;
    private List comments
    = new ArrayList();
    private Set tags = new
    HashSet();
    @Version
    private Integer version;
    ...
    }
    {
    "_id" :
    ObjectId("5149471a0364c59b4e743584"),
    "_class" :
    "pl.maciejwalkowiak.jug.mongo.Post",
    "post_title" : "post title",
    "content" : "hello world coders",
    "createdAt" :
    ISODate("2013-03-20T05:20:26.985Z"),
    "comments" : [ ],
    "tags" : [
    "mongodb",
    "jug",
    "szczecin"
    ],
    "version" : 0,
    "author" : DBRef("user",
    ObjectId("5149471a0364c59b4e743583"))
    }
    

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23. Template
    interface MongoOperations {
    T findOne(Query query, Class entityClass);
    T findAndModify(Query query, Update update, Class entityClass);
    long count(Query query, String collectionName);
    void save(Object objectToSave);
    WriteResult updateMulti(Query query, Update update, Class> entityClass);
    void remove(Query query, Class entityClass);
    GroupByResults group(String inputCollectionName, GroupBy groupBy, Class
    entityClass);
    MapReduceResults mapReduce(Query query, String inputCollectionName, String
    mapFunction, String reduceFunction, Class entityClass);
    CommandResult executeCommand(DBObject command);
    ...
    }
    

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24. Repositories
    DAO in DDD
    CrudRepository
    PagingAndSortingRepository
    declarative find methods
    

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25. Repositories
    public interface UserRepository extends PagingAndSortingRepository{
    User findByName(String name);
    List findByNameLike(String name, Pageable pageable);
    }
    

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26. Repositories
    public interface UserRepository extends PagingAndSortingRepository{
    User findByName(String name);
    List findByNameLike(String name, Pageable pageable);
    }
    public interface PostRepository extends CrudRepository, PostRepositoryCustom {
    @Query("{$where : 'this.content.length > 20'}")
    List findLongPosts();
    @Query("{$where : 'this.content.length > ?0'}")
    List findPostsLongerThan(int length);
    }
    

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27. Repositories
    public interface UserRepository extends PagingAndSortingRepository{
    User findByName(String name);
    List findByNameLike(String name, Pageable pageable);
    }
    @Repository
    public class PostRepositoryImpl implements PostRepositoryCustom {
    @Autowired
    private MongoOperations mongoOperations;
    public Post foo() {
    return mongoOperations.findOne(Query.query(Criteria.where("title").exists(true)),
    Post.class);
    public interface PostRepository extends CrudRepository, PostRepositoryCustom {
    @Query("{$where : 'this.content.length > 20'}")
    List findLongPosts();
    @Query("{$where : 'this.content.length > ?0'}")
    List findPostsLongerThan(int length);
    }
    

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28. Map Reduce
    // map
    function () {
    emit(this.description, 1);
    }
    

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29. Map Reduce
    // reduce
    function (key, values) {
    var sum = 0;
    for (var i = 0; i < values.length; i++)
    sum += values[i];
    return sum;
    }
    // map
    function () {
    emit(this.description, 1);
    }
    

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30. Map Reduce
    MapReduceResults results = mongoOperations.mapReduce("collectionName",
    "classpath:map.js", "classpath:reduce.js", ValueObject.class);
    // reduce
    function (key, values) {
    var sum = 0;
    for (var i = 0; i < values.length; i++)
    sum += values[i];
    return sum;
    }
    // map
    function () {
    emit(this.description, 1);
    }
    

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31. QueryDSL
    Type-Safe criteria API
    

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32. QueryDSL
    @Generated("com.mysema.query.codegen.EntitySerializer")
    public class QPost extends EntityPathBase {
    private static final long serialVersionUID = -1782980951;
    private static final PathInits INITS = PathInits.DIRECT;
    public static final QPost post = new QPost("post");
    public final QUser author;
    public final ListPath comments = this.QComment>createList("comments", Comment.class, QComment.class, PathInits.DIRECT);
    public final StringPath content = createString("content");
    public final org.joda.time.QDateTime createdAt;
    public final org.bson.types.QObjectId id;
    Type-Safe criteria API
    

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33. QueryDSL
    postRepository.findAll(QPost.post.content.contains("hello")));
    @Generated("com.mysema.query.codegen.EntitySerializer")
    public class QPost extends EntityPathBase {
    private static final long serialVersionUID = -1782980951;
    private static final PathInits INITS = PathInits.DIRECT;
    public static final QPost post = new QPost("post");
    public final QUser author;
    public final ListPath comments = this.QComment>createList("comments", Comment.class, QComment.class, PathInits.DIRECT);
    public final StringPath content = createString("content");
    public final org.joda.time.QDateTime createdAt;
    public final org.bson.types.QObjectId id;
    Type-Safe criteria API
    

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34. Demo
    

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35. MongoDB as a Service
    0.5GB for free
    

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36. Q&A
    

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37. Contact
    walkowiak.maciej@yahoo.com
    @MaciejWalkowiak
    http://maciejwalkowiak.pl/
    

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