Question

I am migrating a mysql database to mongodb. But i have read in MongoDb data types and then there is no reference to floating point types like, float, double, decimal.

And how i have some fields with decimal types in my sql schema , how can i do or what can i do?

Answer 1

MongoDB stores data in a binary format called BSON which supports these numeric data types:

• int32 – 4 bytes (32-bit signed integer)
• int64 – 8 bytes (64-bit signed integer)
• double – 8 bytes (64-bit IEEE 754 floating point)

There’s no exact value fixed-point equivalent to mySQL’s decimal type in MongoDB, but you can store 64-bit floating point numbers in Mongo as a double.

It’s worth mentioning that the MongoDB shell – being a JavaScript shell – doesn’t recognise the distinction between integer and floating-point values, it treats all numbers the same because JavaScript represents all numbers as 64-bit floating point, regardless of their underlying BSON type.

Most MongoDB language drivers, however, make the distinction between integer and floating point types.