Re: Script checking to see what database it's connected to

On 2/21/21 4:18 PM, Ron wrote:
>
> Postgresql 12.5
>
> I've got scripts which can run on multiple database (dev, test, QA,
> Integration, Training, etc, etc), so of course I've got to run them like
> "psql my_db_name -f script.sql".
>
> Of course, I sometimes forget to specify the database name, and so it
> fails.
>
> Thus, I want to add a bit to the top of the script, something like this:
>
> \if :DBNAME = postgres
>     echo "must not run in postgres"
>     exit
> \endif
>
> However, I can't seem to find the magic sauce.
>
> This is what I've tried so far:
>
> postgres=# \if :DBNAME == postgres
> unrecognized value "postgres == postgres" for "\if expression": Boolean
> expected
> postgres(at)#
>
> postgres=# \if ':DBNAME' == postgres
> unrecognized value ":DBNAME == postgres" for "\if expression": Boolean
> expected
> postgres(at)#
>
> postgres=# \if :DBNAME == 'postgres'
> unrecognized value "postgres == postgres" for "\if expression": Boolean
> expected
> postgres(at)#
>
> postgres=# \if ':DBNAME' == 'postgres'
> unrecognized value ":DBNAME == postgres" for "\if expression": Boolean
> expected
> postgres(at)#
>
>

Take it up a notch? Write a script which takes the dbname and the
script name:

/pcode/

#!/bin/bash -e
if [[ $# -ne 2 ]]; then echo "missing arg(s)"; exit 2; fi
dbn=$1; shift;
sql=$1; shift;
psql --dbname $dbn --file $sql

/pcode/