June 2014
Intermediate to advanced
696 pages
38h 52m
English
Content preview from Node.js, MongoDB, and AngularJS Web Development
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Understanding Database Update Operators
When performing updates on objects in MongoDB, you need to specify exactly what fields need to be changed and how they need to be changed. Unlike in SQL, where you create long query strings to define an update, in MongoDB you can implement an update object with operators that define exactly how to change the data in the documents.
You can include as many operators in the update object as you need. The format of the update object is shown below:
{ <operator>: {<field_operation>, <field_operation>, . . .}, <operator>: {<field_operation>, <field_operation>, . . .} . . .}
For example, consider the following object:
{ name: "myName", countA: 0, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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