bug#74996: 28.2; sql interactive mode prints output of executed query where the pointer is instead of the bottom of the buffer

[Stephen Berman via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

On Fri, 20 Dec 2024 21:32:53 +0200 Eli Zaretskii <eliz@gnu.org> wrote:

>> Date: Fri, 20 Dec 2024 16:03:59 -0300
>> Cc: 74996@debbugs.gnu.org
>> From: José Júnior <jjnilton@gmail.com>
>> 
>> Alright, I'll try.
>> 
>> 1. Install mysql or mariadb, on Debian I installed the package `mysql-common`
>> 
>> `sudo apt install mysql-common`
>> 
>> 2. Start the mysql/mariadb server:
>> 
>> `sudo service mysql start`
>> 
>> 3. Log in into the server and create a unprivileged user in the interactive
>> mysql shell:
>> 
>> `sudo mysql -u root`
>> 
>> `CREATE USER 'user'@'localhost' IDENTIFIED BY 'password';`
>> 
>> 4. On Emacs, create a new buffer like `*sql*`, then enable sql-mode `M-x sql-mode`;
>> 
>> 5. Connect to the server using `sql-mysql` by providing the values for
>> what's prompted:
>> 
>> - user: user
>> 
>> - password: password
>> 
>> - database: (leave it empty)
>> 
>> - host: localhost
>> 
>> A sql-interactive-mode buffer should be opened if the connection is successful.
>> 
>> 6. In ther *sql* buffer enter the following query:
>> 
>> `show databases;`
>> 
>> And press `C-c C-c` (sql-send-paragraph) on the line of this query to send
>> it to the server;
>> 
>> An output of this query should be printed on the interactive buffer.
>> 
>> 7. Now switch to the interactive buffer, move the pointer to a line where
>> the output of the previous action was printed.
>> 
>> 8. Switch to the *sql* buffer and press `C-C C-c` to send the command again.
>> 
>> Now you should see that the second execution is mixed with the previous one.
>
> Thanks.  If this needs the mysql package, then why do you think the
> problem is in Emacs and not in mysql?  (Apologies if this makes no
> sense: I know nothing about mysql and almost nothing about sql-mode.)

I don't have MySQL or mariadb but I can reproduce the problem with
PostgreSQL in Emacs 29.4, but not in 30 or master, so it seems to have
been fixed since Emacs 30.

Steve Berman