April 2025
Intermediate to advanced
514 pages
13h 8m
Portuguese (Portugal, Brazil)
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Apêndice B. Aspectos internos do MongoDB
Não é necessário entender os aspectos internos do MongoDB para usá-lo de forma eficaz, mas eles podem ser de interesse para desenvolvedores que desejam trabalhar em ferramentas, contribuir ou simplesmente entender o que está acontecendo nos bastidores. Este apêndice cobre alguns dos aspectos básicos. O código fonte do MongoDB está disponível em https://github.com/mongodb/mongo.
BSON
Documentos no MongoDB são um conceito abstrato - a representação concreta de um documento varia consoante o controlador/linguagem utilizado. Como os documentos são usados extensivamente para comunicação no MongoDB, também é necessário que haja uma representação de documentos que seja compartilhada por todos os drivers, ferramentas e processos no ecossistema MongoDB. Essa representação é chamada de Binary JSON, ou BSON (ninguém sabe para onde foi o J).
BSON é um formato binário leve capaz de representar qualquer documento MongoDB como uma cadeia de bytes. A base de dados entende BSON, e BSON é o formato no qual os documentos são salvos no disco.
Quando um controlador recebe um documento para inserir, utilizar como consulta, etc., codifica esse documento para BSON antes de o enviar para o servidor. Do mesmo modo, os documentos que são devolvidos ao cliente a partir do servidor são enviados como cadeias de caracteres BSON. Estes dados BSON são descodificados pelo controlador para a sua representação documental nativa antes de serem devolvidos ao cliente.
O formato BSON ...
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