Question

I have this following SQL and I would like to know the MongoDB equivalent.

update tblName set kwatt = kwatt/3600000 where kwatt is not null.

Note:

I know we can write a JS function in the server and get this done, I want this to be done from PHP driver and I am not sure how can I do this easily.

Please help.

Answer 1

Actually you can do it with both combining findAndModify and stored javascript together..

Create a stored function for division like ;

db.system.js.save({_id: "div",
             value: function (x, y) { return x/y; }});

Then in findAndModify something like ;

findAndModify({query:{id:1},update:{$set:{id:"div(this.id,5)"}}});

It’s just for idea, I didnt test it..

Stored Javascript Sample