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Re: Emitting JSON to file using COPY TO

Davin Shearer <davin@apache.org>

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From: Davin Shearer <davin@apache.org>
To: Joe Conway <mail@joeconway.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>, Andrew Dunstan <andrew@dunslane.net>
Date: 2023-12-03T22:38:28Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add option force_array for COPY JSON FORMAT

  2. json format for COPY TO

  3. introduce CopyFormat, refactor CopyFormatOptions

  4. Doc: add IDs to copy.sgml's <varlistentry> and <refsect1>

" being quoted as \\" breaks the JSON. It needs to be \".  This has been my
whole problem with COPY TO for JSON.

Please validate that the output is in proper format with correct quoting
for special characters. I use `jq` on the command line to validate and
format the output.

On Sun, Dec 3, 2023, 10:51 Joe Conway <mail@joeconway.com> wrote:

> On 12/3/23 10:31, Davin Shearer wrote:
> > Please be sure to include single and double quotes in the test values
> > since that was the original problem (double quoting in COPY TO breaking
> > the JSON syntax).
>
> test=# copy (select * from foo limit 4) to stdout (format json);
> {"id":2456092,"f1":"line with ' in it:
> 2456092","f2":"2023-12-03T10:44:40.9712-05:00"}
> {"id":2456093,"f1":"line with \\" in it:
> 2456093","f2":"2023-12-03T10:44:40.971221-05:00"}
> {"id":2456094,"f1":"line with ' in it:
> 2456094","f2":"2023-12-03T10:44:40.971225-05:00"}
> {"id":2456095,"f1":"line with \\" in it:
> 2456095","f2":"2023-12-03T10:44:40.971228-05:00"}
>
> --
> Joe Conway
> PostgreSQL Contributors Team
> RDS Open Source Databases
> Amazon Web Services: https://aws.amazon.com
>
>