Searching for documents with mongoDB

Question

I am using mongoDB 3.2 with Java.

You can save a mongoDB query to a list of objects in a class of mine?

I want to save the query directly on a list of people.

class Pessoa{
    String nome;
    Date dataNascimento;
    String email;
}

I actually do this, because it’s the only way I know:

public List<Pessoa> listar() throws Exception {
    List<Pessoa> listPessoa = new ArrayList<>();

    MongoClient mongoClient = new MongoClient("localhost", 27017);
    MongoDatabase db = mongoClient.getDatabase("dbExemploMongo");
    FindIterable<Document> iterable = db.getCollection("colecao1").find();

    for (Document document : iterable) {

        listPessoa.add(new Pessoa(
                document.getString("nome"),
                document.getDate("datanasc"),
                document.getString("email"))
        );
    }


    return listPessoa;
}

Thanks in advance!

Answer 1

If you are using Spring, you can use the Mongodb module from Spring Data, or if you only want a POJO mapper you can use the morphia.

On mongodb’s own site there are several options to be used.

To not stick to dependencies, it is possible to make a mapper for Reflection manually defining a service that has a method that waits for the type that comes from mongodb and maps to a type of object that you need by tapping the name of the class attribute with that of the mongodb document by Reflection.