How do you query for “is not null” in Mongo?
I would like to execute a following query: What should be the correct syntax?
nosql
Is there a query language for JSON?
Sure, how about: JsonPath. Json Query They all seem to be a bit work in progress, but work to some degree. They are also similar to XPath and XQuery conceptually; even though XML and JSON have different conceptual models (hierarchic vs object/struct). EDIT Sep-2015: Actually there is now JSON Pointer standard that allows very simple … Read more
What is BSON and exactly how is it different from JSON?
BSON is the binary encoding of JSON-like documents that MongoDB uses when storing documents in collections. It adds support for data types like Date and binary that aren’t supported in JSON. In practice, you don’t have to know much about BSON when working with MongoDB, you just need to use the native types of your language … Read more