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Node learning record: mongodb

brief introduction TalkingMongoDBBefore data insertion, let’s briefly understand its data logical structure.The logical structure of mongodb is a hierarchical structure, which is mainly composed of: document, collectionDatabaseThese three parts are composed of. Document: composed of key / value pairs, like{a:1};{s:”abc”}It is the core unit of mongodb, the document of mongodb, which is equivalent to a […]