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PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

How to do it…

One thing that a superuser can do that ordinary user cannot tell PostgreSQL to copy table data from a file:

pguser@hvost:~$ psql -U postgrestest2...test2=# create table lines(line text);CREATE TABLEtest2=# copy lines from ‘/home/bob/names.txt’;COPY 37test2=# SET ROLE to bob;SETtest2=> copy lines from ‘/home/bob/names.txt’;ERROR:  must be superuser to COPY to or from a fileHINT:  Anyone can COPY to stdout or from stdin. psql’s \copy command also works for anyone.

To let bob copy directly from the file, the superuser can write a special wrapper function for bob, as follows:

create or replace function copy_from(tablename text, filepath text) returns void security definer as $$  declare  begin  execute 'copy ' || quote_ident(tablename) ...
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Publisher Resources

ISBN: 9781788474924Supplemental Content