从MongoDB迁移到MySQL

Question

We are in the process of migrating our mongodb's to MySQL. Most of our client apps and infrastructure makes use of the 24 character mongo id object. I am now looking for a way in which I can generate a similar unique string but in SQL.

I've read up on the subject and some posts suggest that it's impossible to get the same mongo id in sql.

I know the MongoID consists of: [4 bytes seconds since epoch, 3 bytes machine hash, 2 bytes process ID, 3 bytes counter]

I was thinking of writing a MySql function called get_mongo_id() which will return the following:

LEFT(SHA2(UUID(),256),24)

But I'm afraid it might still result in duplicates cause I'm only using the 1st 24 characters from a 64 character HASH.

Have anyone ran into a similar problem before? Any advise would be appreciated.

Answer 1

What you can do is have a string as your primary key and migrate it over. Everything should work the same because MySQL can handle this. Are you afraid of storage issues?