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psql: add an optional execution-count limit to \watch.

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\watch can now be told to stop after N executions of the query.

With the idea that we might want to add more options to \watch
in future, this patch generalizes the command's syntax to a list
of name=value options, with the interval allowed to omit the name
for backwards compatibility.

Andrey Borodin, reviewed by Kyotaro Horiguchi, Nathan Bossart,
Michael Paquier, Yugo Nagata, and myself

Discussion: https://postgr.es/m/CAAhFRxiZ2-n_L1ErMm9AZjgmUK=qS6VHb+0SaMn8sqqbhF7How@mail.gmail.com
This commit is contained in:
Tom Lane
2023-04-06 13:18:14 -04:00
parent 2820adf775
commit 00beecfe83
6 changed files with 135 additions and 32 deletions
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src/bin/psql/help.c
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@@ -200,7 +200,7 @@ slashUsage(unsigned short int pager)
HELP0(" \\gset [PREFIX] execute query and store result in psql variables\n");
HELP0(" \\gx [(OPTIONS)] [FILE] as \\g, but forces expanded output mode\n");
HELP0(" \\q quit psql\n");
HELP0(" \\watch [SEC] execute query every SEC seconds\n");
HELP0(" \\watch [[i=]SEC] [c=N] execute query every SEC seconds, up to N times\n");
HELP0("\n");
HELP0("Help\n");