Provide a test for variable existence in psql
Andrew Dunstan <andrew@dunslane.net>
Provide a test for variable existence in psql
"\if :{?variable_name}" will be translated to "\if TRUE" if the variable
exists and "\if FALSE" otherwise. Thus it will be possible to execute code
conditionally on the existence of the variable, regardless of its value.
Fabien Coelho, with some review by Robins Tharakan and some light text
editing by me.
Discussion: https://postgr.es/m/alpine.DEB.2.20.1708260835520.3627@lancre
Files
| Path | Change | +/− |
|---|---|---|
| doc/src/sgml/ref/psql-ref.sgml | modified | +10 −0 |
| src/bin/psql/psqlscanslash.l | modified | +18 −0 |
| src/fe_utils/psqlscan.l | modified | +41 −1 |
| src/include/fe_utils/psqlscan_int.h | modified | +2 −0 |
| src/test/regress/expected/psql.out | modified | +26 −0 |
| src/test/regress/sql/psql.sql | modified | +18 −0 |
Documentation touched
Discussion
- psql - add ability to test whether a variable exists 14 messages · 2017-08-26 → 2017-09-20