Java Programming Tutorials

Java programming tutorials with many code examples!

MongoDB join collections

For long time MongoDB didn’t have any means to join collections, but since version 3.2 there is a way to do simple left outer join of two collections.

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MongoDB JSON to Document/DBObject

MongoDB integrates with JSON very well, but how to convert JSON to Document/DBObject using MongoDB API? In this post we show two solutions.

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MongoDB 3 array query operations

MongoDB 3 array query operations are very helpful and simplify digging in nested structures. In this post we’ll show how to create queries that match array elements in various ways.

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MongoDB performance tuning tips

MongoDB performance tuning tips

This tutorial is a collection of performance tuning tips for Java developers that would like to improve performance of their Java apps on top of MongoDB.

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