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Interactive PostgreSQL Script

Do you want an input from end user, while running PostgreSQL script.

No Problem, here is the one of the solution for you.

In the following example, i am taking the confirmation from an end user, before dropping an existing database called "sample".

-- When any exception raised from this script, the complete script execution is going to fail.

-- We will be raising a custom exception, when the Drop DB != 'y|Y';

-- Take input from the user.
\prompt 'Are you sure to drop ' Do_You_Want_To_Drop_Db

-- Get the user input.
\set Do_Drop_Db '\'' :Do_You_Want_To_Drop_Db '\''

-- Creating a temp table to store the value of the user confirmation.
-- This will be dropped when the session got closed.
CREATE TEMP TABLE Drop_Db AS SELECT :Do_Drop_Db::text AS confirm;

RAISE EXCEPTION 'Database won''t drop. Hence closing this session';
RAISE NOTICE 'Database will be droped. Please make sure the connection of this databases get closed.';


Testing the Script
bash-4.1$ ../bin/psql -U postgres -f /tmp/Interactive_Sql.Sql postgres
Are you sure to drop N
psql:/tmp/Interactive_Sql.Sql:28: ERROR:  Database won't drop. Hence closing this session
bash-4.1$ ../bin/psql -U postgres -f /tmp/Interactive_Sql.Sql postgres
Are you sure to drop Y
psql:/tmp/Interactive_Sql.Sql:28: NOTICE:  Database will be droped. Please make sure the connection of this databases get closed.

దినేష్ కుమార్ 
Dinesh Kumar


  1. Thank u for the useful script and I was searching for this style of script in postgres.


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