September 2018
Beginner to intermediate
192 pages
4h 37m
English
Content preview from MongoDB 4 Quick Start Guide
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Searching by ObjectId
In the legacy RDBMS world, developers are used to performing searches based on the primary key. In MongoDB, there is no concept of a primary key, as each document can be completely different from others, including having a completely different mix of fields. Accordingly, in order to keep the collection organized, MongoDB auto-generates an ObjectId instance. This is guaranteed to be unique among servers, replicas, and shards. It is created from the UNIX timestamp, a machine identifier, process ID, and a random value.
In order to perform a search based on this value, you can use the MongoDB\BSON\ObjectId class. To demonstrate how this works, let's work off the search we showed you previously. For illustration purposes, ...
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