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MongoDB Cookbook by Amol Nayak

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Implementing triggers in MongoDB using oplog

A trigger in a relational database is a code that gets invoked when an insert, update, or a delete operation is executed on a table in the database. A trigger can be invoked either before or after the operation. Triggers are not implemented in MongoDB out of the box, and in case you need some sort of notification for your application whenever any insert, update, and delete operations are executed, you are left to manage them by yourself in the application. One approach is to have some sort of data access layer in the application that is the only place to query, insert, update, or delete documents from the collections. However, there are a few challenges to this. First, you need to explicitly code the ...

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