mongodb like concat mysql query

问题

I have a table in Mysql where I have some D and C classes of IPs and I use this table to test if a request IP is in the database OR belongs to the C class like that:

select * from My_Table 
where '192.168.1.12' LIKE CONCAT(ip, '%');

(where 192.168.1.12 is the request IP I am testing against my table)

In my Database, if I have the ip '192.168.1' in C format, I will get a match.

I was thinking about using MongoDB and have the same information in documents where each IP (either in C or D class format) is the _id (which is indexed by default).

How can I get it to work with MongoDB if regex would work just the opposite way? (if I had the C class beforehand)

If I split every request IP into a C class to check with regex like:

db.my_table.find(_id: '^/split_ip/')

I would have to check in my application again every result by iteration and I think that wouldn't be a good solution.

So, I am wondering if you have any advice or suggestion to give me.

回答1:

You could use the $in operator to get all matching from a single query.

{ _id: {$in : [/^192.0.1.1/, /^194.1.1/ ] }}

Becuase you're using /^ option in regex, the index will be used.

Does that help?

来源：https://stackoverflow.com/questions/14562076/mongodb-like-concat-mysql-query