How to insert in an 8-byte integer into MongoDB through JavaScript shell?

Question

As per "MongoDB - The definitive guide",

JavaScript has only a float type whereas MongoDB has a 4-byte integer, an 8-byte integer and an 8-byte float
By default all the numbers will be treated as double

When I tried to insert a integer, I am getting the following:

> n = {"myInteger" : 3 };    
{ "myInteger" : 3 }    
> db.num.insert(n);
> n = db.num.find();    
{ "_id" : ObjectId("4eeee1e5b593471ba5461577"), "myInteger" : 3 }

Based on the above, I have the following questions:

How do I insert an 8-byte integer into MongoDB through JavaScript?
How do I check the type of the myInteger value displayed above, by JavaScript?
How do I check the type of the myInteger value stored in MongoDB?

Thilo · Accepted Answer · 2011-12-19 07:14:50Z

5

How do I insert an 8-byte integer into MongoDB through JavaScript?

You can use

n = {"myLong" :  new NumberLong("123212313")};

answered Dec 19, 2011 at 7:14

Thilo

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3 Comments

Thilo Over a year ago

+1 for your other questions, because that seems tricky. You can do instanceof NumberLong, but that won't work for 4-byte numbers, they are both just JS "number".

Ken Russell Over a year ago

Thilo: When I retrieve the value from MongoDB, the data is displayed as {"myInteger" : NumberLong(3)} as against {"myInteger" : {"floatApprox : 3} } that is given in the book. Are there two ways of storing 8-byte integers in MongoDB?

Ken Russell Over a year ago

[From mongodb.org] Prior to version 1.6, the shell will display {"floatApprox": 3} but from 1.6, the shell will display NumberLong(3).

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