MongoDB存储ObjectId的数组 [英] MongoDB storing arrays of ObjectId's
本文介绍了MongoDB存储ObjectId的数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
$ b $ pre $
[ObjectId(50350e12a36feb1be6000364),ObjectId(57350e12a37fef1be6000922),ObjectId(10350e17d34ffb1be6200925)]
或类似的东西:
<$ p $
$ b $我可以节省第二个空间,然后将其转换为
ObjectId
,但是使用这种方法是否会丢失任何东西? 解决方案
肯定会用第一种方法,直接存储 ObjectId
s。这节省了空间,如 ObjectId
是12个字节,而第二个方法字符串是24个字节。另外,如果稍后使用 ObjectId
s来获取对象,则存储为 ObjectId
节省了一些麻烦。
In my database I have to store an array of object ids. What should I use? Something like this:
[ObjectId("50350e12a36feb1be6000364"), ObjectId("57350e12a37fef1be6000922"), ObjectId("10350e17d34ffb1be6200925")]
or something like this:
["50350e12a36feb1be6000364", "57350e12a37fef1be6000922", "10350e17d34ffb1be6200925"]
I could save space with the second, and then cast to ObjectId
, but am I loosing anything by using this approach? Do ObjectId
s behave like foreign keys in relational databases?
解决方案
I would definitely go with the first approach, storing the ObjectId
s directly. This saves space, as ObjectId
is 12 bytes whereas the second approach string is 24 bytes.
Also, if the ObjectId
s are used to fetch the objects later, storing as ObjectId
saves some hassle.
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