MongoDB for Java Developers: The Ultimate Spring Data MongoDB Starter Kit

Unleash the combined power of MongoDB and Spring to build your Java applications efficiently. This talk will introduce you to the fundamentals of using Spring Boot, a leading framework in the Java ecosystem, and Spring Data MongoDB to quickly create MongoDB-backed applications and simplify database interactions.

By the end of the presentation, you will have a basic understanding of Spring Data repositories for MongoDB and how the integration works.

Transcript

1. MongoDB for Java Developers The Ultimate Spring Data MongoDB Starter Kit Christoph Strobl, R&D Engineer, Broadcom Copyright © 2005-2024 Broadcom, Inc. or its affiliates.
2. DON‘T PANIC Douglas Adams, The Hitchhiker's Guide to the Galaxy
5. MongoClient
6. Spring Data MongoDB
7. Spring Data MongoDB JPA JDBC Neo4j R2DBC ArangoDB Couchbase Cosmos DB yugabyteDB Elasticsearch Apache Cassandra ….
8. Spring Data offers Familiar & Consistent Programming Model That Respects Store Specific Traits no silver bullet no magic not one API to rule them all
9. Default Implementation Repository Interface List<Employee> findByFirstName(String name) Repository Anatomy
10. Entity Manager Template API Mapping Conversion Resource & Transaction
 Management native store format <> domain type eg. enum -> string Default Implementation Repository Interface List<Employee> findByFirstName(String name) Repository Anatomy
11. Entity Manager Template API Mapping Conversion Resource & Transaction
 Management native store format <> domain type eg. enum -> string Default Implementation Repository Interface List<Employee> findByFirstName(String name) Repository Anatomy
12. Entity Manager Database Driver Template API Mapping Conversion Resource & Transaction
 Management native store format <> domain type eg. enum -> string Default Implementation Repository Interface List<Employee> findByFirstName(String name) Repository Anatomy
13. Entity Manager Database Driver Template API Mapping Conversion Resource & Transaction
 Management native store format <> domain type eg. enum -> string Default Implementation Repository Interface List<Employee> findByFirstName(String name) MongoClient Repository Anatomy
14. interface Repo<Employee, String> extends . . . { Repository Composition
15. interface Repo<Employee, String> extends . . . { Repository CrudRepository findAll(); findById(...) count(); save(...); delete(...); ... PagingAndSorting Repository findAll(Page); findAll(Sort); Repository Composition
16. interface Repo<Employee, String> extends . . . { Repository CrudRepository findAll(); findById(...) count(); save(...); delete(...); ... PagingAndSorting Repository findAll(Page); findAll(Sort); Proxy Default Implementation Store Specific Repository Composition
17. interface Repo<Employee, String> extends . . . { Repository CrudRepository findAll(); findById(...) count(); save(...); delete(...); ... PagingAndSorting Repository findAll(Page); findAll(Sort); Proxy Default Implementation Store Specific List<Employee> f i ndAll(); long count(); Predefined methods List<Employee> f i ndByFirstName(String name); Derived Finder Method Repository Composition
18. Derived Queries 18 List<Employee> f i ndByFirstName(String name)
19. Derived Queries 19 List<Employee> f i ndByFirstName(String name) Return Type
20. Derived Queries 20 List<Employee> f i ndByFirstName(String name) Return Type Operation Keyword
21. Derived Queries 21 List<Employee> f i ndByFirstName(String name) Return Type Operation Keyword Match Against
22. Derived Queries 22 List<Employee> f i ndByFirstName(String name) Return Type Operation Keyword Match Against Bind Argument
23. Break It Down 23 List<Employee> f i ndEmployeeByFirstNameLikeOrderByAgeAsc(String name)
24. Break It Down 24 List<Employee> f i ndEmployeeByFirstNameLikeOrderByAgeAsc(String name) Employee Page<Employee> Slice<Employee> Stream<Employee> Window<Employee>
25. Break It Down 25 List<Employee> f i ndEmployeeByFirstNameLikeOrderByAgeAsc(String name) read get query search stream Placeholder For Anything You Like Delimiter Employee Page<Employee> Slice<Employee> Stream<Employee> Window<Employee>
26. Break It Down 26 List<Employee> f i ndEmployeeByFirstNameLikeOrderByAgeAsc(String name) read get query search stream Placeholder For Anything You Like matches contains lessThan startsWith greaterThan isEmpty isNull isNotNull before after ... Match Operator Delimiter Employee Page<Employee> Slice<Employee> Stream<Employee> Window<Employee>
27. Break It Down 27 List<Employee> f i ndEmployeeByFirstNameLikeOrderByAgeAsc(String name) read get query search stream Placeholder For Anything You Like matches contains lessThan startsWith greaterThan isEmpty isNull isNotNull before after ... Match Operator Sort Direction Delimiter Employee Page<Employee> Slice<Employee> Stream<Employee> Window<Employee>
28. Template APIs class MongoTemplate implements MongoOperations { <T> List<T> f i nd(Query query, Class<T> entityClass) <T> List<T> f i ndAndRemove(Query query, Class<T> entityClass) <T> T execute(Class<?> entityClass, CollectionCallback<T> callback) query(where(“firstName”).is(...)) template.execute(Employee.class, collection - > { return collection.f i nd(new Document("f i rstname", " .. . ")) .into(new ArrayList()); }); Access to native driver commands MongoDB
29. class Employee { Long id; String f i rstName; String lastName; } class Manager { Long id; String name; List<Employee> employees } { _id : 1000, name : Marvin, employees : [ { id : 1, f i rstName : Ford, lastName : Prefect } , … ] } Basic Mapping MongoDB db.manager
30. @Document("managers") @Sharded(shardKey = { "country" }) class Manager { @Id Long id; String country; @Indexed @Field("full_name") String name; @Version Long version; @CreatedDate Instant created; @EncryptedField(altKeyName="secret",…) String ssn; @DBRef List<Employee> employees; @DocumentReference Supervisor supervisor; { _id : 1000, country : space full_name : Marvin, version: 2, created: 1725879207729, ssn: *****, employees : [ { $ref : employee, $id : … }, … ], supervisor: 42 } db.managers Mapping MongoDB Advanced
31. Would it save you a lot of time if I just gave up and went mad now? Douglas Adams, The Hitchhiker's Guide to the Galaxy
32. Specific Features MongoDB @Hint("lastname - idx") List<Employee> f i ndByLastname(String lastname);
33. Specific Features MongoDB @Hint("lastname - idx") List<Employee> f i ndByLastname(String lastname); @Query(value="{ 'f i rst_name' : ?0 }", f i elds="{ 'f i rst_name' : 1, 'last_name' : 1}") List<Employee> f i ndByFirstname(String f i rstname);
34. Specific Features MongoDB @Hint("lastname - idx") List<Employee> f i ndByLastname(String lastname); @Query(value="{ 'f i rst_name' : ?0 }", f i elds="{ 'f i rst_name' : 1, 'last_name' : 1}") List<Employee> f i ndByFirstname(String f i rstname); @ReadPreference("secondaryPreferred") List<Employee> f i ndByFirstname(String f i rstname);
35. Specific Features MongoDB @Hint("lastname - idx") List<Employee> f i ndByLastname(String lastname); @Query(value="{ 'f i rst_name' : ?0 }", f i elds="{ 'f i rst_name' : 1, 'last_name' : 1}") List<Employee> f i ndByFirstname(String f i rstname); @ReadPreference("secondaryPreferred") List<Employee> f i ndByFirstname(String f i rstname); List<Employee> f i ndByLocationNear(Point location, Distance distance); GeoResults<Employee> f i ndByLocationNear(Point location, Distance distance);
36. Specific Features MongoDB @Hint("lastname - idx") List<Employee> f i ndByLastname(String lastname); @Query(value="{ 'f i rst_name' : ?0 }", f i elds="{ 'f i rst_name' : 1, 'last_name' : 1}") List<Employee> f i ndByFirstname(String f i rstname); @ReadPreference("secondaryPreferred") List<Employee> f i ndByFirstname(String f i rstname); List<Employee> f i ndByLocationNear(Point location, Distance distance); GeoResults<Employee> f i ndByLocationNear(Point location, Distance distance); @Update("{ '$inc' : { 'visits' : 1 } }") long f i ndAndIncrementVisitsByLastname(String lastname);
37. Specific Features MongoDB @Hint("lastname - idx") List<Employee> f i ndByLastname(String lastname); @Query(value="{ 'f i rst_name' : ?0 }", f i elds="{ 'f i rst_name' : 1, 'last_name' : 1}") List<Employee> f i ndByFirstname(String f i rstname); @ReadPreference("secondaryPreferred") List<Employee> f i ndByFirstname(String f i rstname); List<Employee> f i ndByLocationNear(Point location, Distance distance); GeoResults<Employee> f i ndByLocationNear(Point location, Distance distance); @Update("{ '$inc' : { 'visits' : 1 } }") long f i ndAndIncrementVisitsByLastname(String lastname); List<Manager> deleteByLastname(String lastname);
38. I‘d far rather be happy than right any day. Douglas Adams, The Hitchhiker's Guide to the Galaxy
39. Extension API interface AtlasRepository<T> { List<T> vectorSearch(String index, String path, List<Double> vector, Limit limit); } 1. Define it
40. Extension API interface AtlasRepository<T> { List<T> vectorSearch(String index, String path, List<Double> vector, Limit limit); } class AtlasRepositoryImpl implements AtlasRepository<T>, RepositoryMetadataAccess { @Autowired MongoOperations mongoOperations; @Override public List<T> vectorSearch(String index, String path, List<Double> vector, Limit limit) { RepositoryMethodContext metadata = RepositoryMethodContext.currentMethod(); Class<?> domainType = metadata.getRepository().getDomainType(); Document $vectorSearch = …; Aggregation aggregation = newAggregation(ctx - > $vectorSearch); return mongoOperations.aggregate(aggregation, domainType).getMappedResults(); } } 1. Define it 2. Implement it
41. Extension API interface AtlasRepository<T> { List<T> vectorSearch(String index, String path, List<Double> vector, Limit limit); } class AtlasRepositoryImpl implements AtlasRepository<T>, RepositoryMetadataAccess { @Autowired MongoOperations mongoOperations; @Override public List<T> vectorSearch(String index, String path, List<Double> vector, Limit limit) { RepositoryMethodContext metadata = RepositoryMethodContext.currentMethod(); Class<?> domainType = metadata.getRepository().getDomainType(); Document $vectorSearch = …; Aggregation aggregation = newAggregation(ctx - > $vectorSearch); return mongoOperations.aggregate(aggregation, domainType).getMappedResults(); } } interface MovieRepository extends CrudRepository<Movie>, AtlasRepository<Movie> { } 1. Define it 2. Implement it 2. Use it
43. start.spring.io Thank you!