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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: Ron Johnson <[email protected]>
Cc: Pgsql-admin <[email protected]>
Subject: Re: Having trouble passing a shell variable to a query from psql command line
Date: Fri, 29 Aug 2025 15:15:12 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaBC5rx0fNbmx1bom9ZE3v1UgQxH3uXWOFHCfUb=rkqcEQ@mail.gmail.com>
References: <DM8PR09MB6677729E8FC7452DAAD053E5B83AA@DM8PR09MB6677.namprd09.prod.outlook.com>
<CANzqJaBC5rx0fNbmx1bom9ZE3v1UgQxH3uXWOFHCfUb=rkqcEQ@mail.gmail.com>
Ron Johnson <[email protected]> writes:
> Yeah. From the cli KISS and do regular bash variable string expansion.
> psql -d mydb -tAc "SELECT relkind FROM pg_class WHERE relname =
> ${SHELL_VAR} ;"
This isn't a great recommendation because bash is not aware of
SQL's quoting rules. It'll work in simple cases, but there's
a risk of SQL injection if the value of SHELL_VAR comes from
an untrustworthy source.
regards, tom lane
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