Re: Using DSN Connection and knowing windows username

Thank you Adrian,

In the meantime just an idea, but could you capture the system user in a table in Access and use that to pass on to Postgres?

Brilliant ! simple and genious!

The purpose of it is to have history log table with DML and DDL changes using triggers. 

Best,

Luke

2018-06-21 0:11 GMT+02:00 Adrian Klaver <adrian.klaver@aklaver.com>:

On 06/20/2018 07:06 AM, Łukasz Jarych wrote:

David G,

thank you.
Can you confirm if i am thinking correctly ?

So I can set up authetification to know which user is logged on and use this as postgresql user?

Only if the system user is a postgres user or can be mapped to one:

https://www.postgresql.org/docs/10/static/auth-username-maps.html

But i think it will be not possible to use DSN connection with this.

If you are talking about the ODBC DSN you use to create the linked table in Access then you are correct you are limited to whatever user is specified in the ODBC Manager.

It would help to know what you plan to use the user name for?

In the meantime just an idea, but could you capture the system user in a table in Access and use that to pass on to Postgres?

Best ,
Luke

2018-06-20 15:34 GMT+02:00 David G. Johnston <david.g.johnston@gmail.com <mailto:david.g.johnston@gmail.com>>:

    On Wednesday, June 20, 2018, Łukasz Jarych <jaryszek@gmail.com
    <mailto:jaryszek@gmail.com>> wrote:

        How to know in postgresql which specific windows user is using
        database?

    You cannot.  All the server knows is the specific user credentials
    it is authenticating.

    That said you can authenticate those credentials in such a way so
    that knowing the signed on user you would also know who they are in
    any environment that uses the same authentication source - and if
    that source supplies their Windows identity you are golden. The
    specific setups involved here are outside my experience, though.

    David J.

--
Adrian Klaver
adrian.klaver@aklaver.com