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From: Dmitry Igrishin <[email protected]>
To: Tom Lane <[email protected]>
Cc: Les <[email protected]>
Cc: [email protected]
Subject: Re: psycopg3 - parameters cannot be used for DDL commands?
Date: Wed, 5 Jan 2022 20:20:36 +0300
Message-ID: <CAAfz9KNgYfJhHL5NKS1frPDo286sn-c0PNA6ZOF81f5TBByc=A@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAKXe9UDix+STcO8akzNNhjS4tEZd7xs203XNn72G35ELm81=WQ@mail.gmail.com>
	<[email protected]>

ср, 5 янв. 2022 г. в 20:07, Tom Lane <[email protected]>:
>
> Les <[email protected]> writes:
> > PostgreSQL server log:
>
> > 2022-01-05 17:35:25.831 CET [58] ERROR:  syntax error at or near "$1" at
> > character 35
> > 2022-01-05 17:35:25.831 CET [58] STATEMENT:  ALTER USER postgres WITH
> > PASSWORD $1
>
> Yeah, as a general rule parameters can only be used in DML commands
> (SELECT/INSERT/UPDATE/DELETE).  Utility commands don't support them
> because they don't have expression-evaluation capability.
>
> (Perhaps this will change someday, but don't hold your breath.)
>
> > Passwords can also contain special characters. If I can't use parameters to
> > do this, then how should I quote them in a safe way?
>
> Most client libraries should have a function to convert an arbitrary
> string into a safely-quoted SQL literal that you can embed into the
> command.  I don't know psycopg3, so I don't know what it has for that.
My C++ library, - Pgfe, - can convert any named parameter into an
arbitrary part of SQL expression by using Sql_string::replace()
method. For example:
  update :foo
could be replaced to
  update foo set bar = 'baz' where id = 1
by using
  s.replace("foo", R"(set bar='baz' where id = 1)").

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