2016年12月1日
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Update Methods MongoDB provides the following methods for updating documents in a collection: Updates at most a single document that match a specified 阅读全文
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The db.collection.find() method returns a cursor. To access the documents, you need to iterate the cursor. However, in the mongo shell, if the returne 阅读全文
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Different query operators in MongoDB treat null values differently. The examples on this page use the db.collection.find() method in the mongo shell. 阅读全文
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By default, queries in MongoDB return all fields in matching documents. To limit the amount of data that MongoDB sends to applications, you can includ 阅读全文
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Query Method MongoDB provides the db.collection.find() method to read documents from a collection. The db.collection.find() method returns a cursor to 阅读全文
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CRUD operations create, read, update, and delete documents. Create Operations Create or insert operations add new documents to a collection. If the co 阅读全文
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mongo Shell Command History You can retrieve previous commands issued in the mongo shell with the up and down arrow keys. Command history is stored in 阅读全文
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MongoDB BSON provides support for additional data types than JSON. Drivers provide native support for these data types in host languages and the mongo 阅读全文
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You can write scripts for the mongo shell in JavaScript that manipulate data in MongoDB or perform administrative operation. For more information abou 阅读全文
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In addition to the documentation in the MongoDB Manual, the mongo shell provides some additional information in its “online” help system. This documen 阅读全文