David G. Johnston wrote:

> Being able to do more conditional work in psql would make setting up more
> robust scripts easier and without either losing transaction capabilities or
> session pooling for improved performance when large numbers of small
> commands are run in between flow control in done in bash.

Have you tried to script processes in shell using a single background
psql process with which the shell code communicates using a pipe?  I've
long been curious about that approach, but never had a strong need
enough to actually write the code.  It should be possible.

Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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