How Can PostgreSQL's Temporary Functions Solve the Problem of One-Time Function Needs?

PostgreSQL temporary functions: a one-time solution

A loop needs to be executed in the database, but only as a one-time requirement, which presents a difficult problem: creating and deleting a function after it has completed its purpose. To solve this problem, PostgreSQL provides a convenient method - creating temporary functions.

Solution

Temporary functions reside in pg_temp mode, a temporary mode that exists for the duration of the user connection. Creating a function in this mode ensures that it is only available in active connections. When the connection is closed or expires, the schema and its contents (including functions) are discarded.

To create a temporary function, just prepend it with the pg_temp schema name. For example:

<code class="language-sql">CREATE FUNCTION pg_temp.testfunc() RETURNS TEXT AS $$
SELECT 'hello'::text
$$ LANGUAGE SQL;</code>

This function is available before the connection is terminated, no drop command is required.

This method is particularly useful for tasks or one-time data manipulation that require executing a function multiple times in a script. By using temporary functions, you can keep your database clean and organized while ensuring that temporary functions do not clutter the schema space.

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