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* Restriction on comments
@ 2022-10-21 05:49 PG Doc comments form <noreply@postgresql.org>
2022-10-21 09:50 ` Re: Restriction on comments Daniele Varrazzo <daniele.varrazzo@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: PG Doc comments form @ 2022-10-21 05:49 UTC (permalink / raw)
To: pgsql-docs@lists.postgresql.org; +Cc: maccaroo@gmail.com
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/15/sql-comment.html
Description:
I've recently been converting some DML which was intended for BigQuery to
use PostgreSQL 14. Using a python client (using sqlalchemy and the
postgresql+psycopg2 driver), I had successfully created a table and was
trying to add comments to the columns. All of this was previously done in a
single statement on BigQuery, but requires separate CREATE TABLE and COMMENT
ON COLUMN statements for PostgreSQL.
For one of the comment statements I received this error: "dict is not a
sequence". It turns out the culprit was that one of the comments had a '%'
character. I'm not familiar with restrictions on strings in PostgreSQL, but
it would be helpful to have a list of these.
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Restriction on comments
2022-10-21 05:49 Restriction on comments PG Doc comments form <noreply@postgresql.org>
@ 2022-10-21 09:50 ` Daniele Varrazzo <daniele.varrazzo@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: Daniele Varrazzo @ 2022-10-21 09:50 UTC (permalink / raw)
To: maccaroo@gmail.com; pgsql-docs@lists.postgresql.org
On Fri, 21 Oct 2022 at 09:23, PG Doc comments form
<noreply@postgresql.org> wrote:
>
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/15/sql-comment.html
> Description:
>
> I've recently been converting some DML which was intended for BigQuery to
> use PostgreSQL 14. Using a python client (using sqlalchemy and the
> postgresql+psycopg2 driver), I had successfully created a table and was
> trying to add comments to the columns. All of this was previously done in a
> single statement on BigQuery, but requires separate CREATE TABLE and COMMENT
> ON COLUMN statements for PostgreSQL.
>
> For one of the comment statements I received this error: "dict is not a
> sequence". It turns out the culprit was that one of the comments had a '%'
> character. I'm not familiar with restrictions on strings in PostgreSQL, but
> it would be helpful to have a list of these.
This is likely not coming from PostgreSQL. Psycopg uses `%s` as a
placeholder. As a consequence, if you want to pass a literal `%`, you
have to escape it at `%%`.
See documentation at
https://www.psycopg.org/docs/usage.html#passing-parameters-to-sql-queries
-- Daniele
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