Does DSN support instance numbers and multiple container specified tenant databases? about go-hdb

[stfnmllr]

@scottlepp please see https://github.com/SAP/go-hdb/tree/v1.5.0-rc1

With this version connecting via database name is supported whether by:

• Connector WithDatabase method or
• as additional DSN parameter databaseName

https://help.sap.com/docs/SAP_HANA_PLATFORM/78209c1d3a9b41cd8624338e42a12bf6/7a9343c9f2a2436faa3cfdb5ca00c052.html

In case the database name is used, the host port number is the fixed number of the system database:
3<instance>13 (SQL)

Would be great if you can give it a try and share the result before the final v1.5.0 version would be released.

[stfnmllr]

DSN does not support instance numbers and tenant database name, but there is a 1:1 relationsship between them and the ip address (host:port).
Please see the first section in SAP Help Portal as reference.

[scottlepp]

@stfnmllr can we reopen this? According to the docs, the preferred approach is to use the database name.

Other teams in the SAP organization are requesting this feature so they don't have to manage ports. Request from SAP:

This is highly important, not just for us but for the all SAP HANA users because HANA born to be a multi-tenant database with multi-instances.
We want to connect against official datasource DNS name and official port, so that in case of a takeover or tenant move, client settings do not have to get updated.

They reference this go client which has the database name setting.

[stfnmllr]

https://github.com/SAP/go-hdb/tree/v1.5.0-rc2

[stfnmllr]

https://github.com/SAP/go-hdb/releases/tag/v1.5.0

[shelldandy]

hey there, @stfnmllr im writing about this comment you made:

In case the database name is used, the host port number is the fixed number of the system database:
313 (SQL)

is there a way of getting this information with the driver? ideally just providing host + database name, otherwise then it seems like the benefits of adding tenant database name are countered by having to add the port anyways since there seem to be many edge cases towards inferring it based on the link provided

https://help.sap.com/docs/SAP_HANA_PLATFORM/78209c1d3a9b41cd8624338e42a12bf6/7a9343c9f2a2436faa3cfdb5ca00c052.html

[shelldandy]

I guess my actual question would be: does the port number for tenant instances that is guaranteed to work is:

3<instance>13

eg: 30113

[stfnmllr]

Yes, the port number for the 'system database' is guaranteed to work:

And you would use this 'constant address' in conjunction with the database name to connect to a tenant database.

[shelldandy]

Perfect thank you very much for the clarification!