问题描述
MongoDB中的double，NumberLong，NumberInt或简单Integer数据类型之间的主要区别(大小，速度等)是什么?
What are the main differences (size, speed, etc) between the datatypes double, NumberLong, NumberInt or a simple Integer in MongoDB?
如果我想保存一个小的固定数字(0到1000之间)，应该使用哪种数据类型?
If I want to save a small fixed number (something between 0 and 1000) which data type should I use?
推荐答案
NumberInt
默认情况下，mongo shell将所有数字视为浮点值. mongo shell提供了NumberInt()构造函数来显式指定32位整数.
By default, the mongo shell treats all numbers as floating-point values. The mongo shell provides the NumberInt() constructor to explicitly specify 32-bit integers.
NumberLong
默认情况下，mongo shell将所有数字视为浮点值. mongo shell提供了NumberLong()类来处理64位整数.
By default, the mongo shell treats all numbers as floating-point values. The mongo shell provides the NumberLong() class to handle 64-bit integers.
NumberLong()构造函数接受long作为字符串:
The NumberLong() constructor accepts the long as a string:
NumberLong("2090845886852")
来源: http://docs.mongodb.org/manual/core/shell -types/
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