MongoDB Atlas connection

#1

Hi - I am trying to follow the tutorial on mongo db at : https://docs.liquibase.com/workflows/database-setup-tutorials/mongodb.html
The problem is in the example, it conencts to a local mongodb deployment and I want to connect to Mongo Atlas.

In the liquibase.properties file the advise is to put - “url: mongodb://hostname:27017/myDatabase”

However, Atlas URL should be “mongodb+srv://hostname:27017/myDatabase”

Liquibase does not seem to like this, it throws an exception:

Cannot find database driver: Driver class was not specified and could not be determined from the url

Surely connecting to mongo atlas should be possible? Please guide me as to how?

Thanks

#2

Hi @spozza,

MongoDB support is provided by Liquibase extension, which means the additional functionality for the db platform is provided by the community (and is a good candidate for being pulled into liquibase core if it aligns).

I’ve never seen MongoDB Atlas being used, and so, I would recommend logging an issue so the maintainer can give the definitive response as to support, or add it if not present:

HTH,

Ronak

#3

Thanks that helps

I did figure this out and the solution is to just use an older style url to connect it to atlas (without the srv bit) which does the job

#4

OMG, that’s awesome @spozza,

Favor please: Would you share the format? Is it just the TLS arg in the Url?

I am so happy you got it working!

Ronak

#5

yeah sure. So the atlas connections have the “+SRV” syntax which first problem is that it confuses the driver auto detection

To resolve, I used a backward compatible connection string like this:

mongodb://username:password@some-cluster-shard-00-00.XXXXX.mongodb.net:27017/?ssl=true&replicaSet=some-cluster-shard-0&authSource=admin&retryWrites=true&w=majority

This successfully recognizes the driver and also makes the connection.
I checked with mongo if this format was likely to be deprecated at any stage and they said very unlikely

Maybe this will help someone else someday :slight_smile:

Cheers

2 Likes
#6

@spozza Above mentioned way is not working for me… It is giving me an error
Unexpected error running Liquibase: liquibase.exception.DatabaseException: Could not query for long
Could you please help where i am going wring ?

#7

@spozza , thanks for your reply.

@Nitish , welcome!

Would you share the exact liquibase command you are running? If you are using a liquibase.properties file, please share the info (esp. URL and classpath). Also will need to see your complete log, its not enough info to diagnose with just the error snippet.