How to Drop All Overloaded Functions with a Specific Name in PostgreSQL?

Dropping Functions with Wildcards

In PostgreSQL, it's possible to drop all functions with a given name regardless of the number or types of parameters they have. This can be useful when managing a large number of functions.

Basic Query

The following query creates all necessary DDL statements to drop all functions with a specific name:

SELECT 'DROP FUNCTION ' || oid::regprocedure
FROM pg_proc
WHERE proname = 'my_function_name'
AND pg_function_is_visible(oid);

This query generates 'DROP FUNCTION' statements for each overload of the function 'my_function_name', ensuring that all versions of the function are removed. The 'pg_function_is_visible()' function ensures that only functions in the current search path are selected.

Function

Alternatively, you can use a PL/pgSQL function to automate the process of dropping functions with wildcards:

CREATE OR REPLACE FUNCTION f_delfunc(_name text, OUT functions_dropped int)
LANGUAGE plpgsql AS $$
DECLARE
  _sql text;
BEGIN
  SELECT count(*)::int
  , 'DROP FUNCTION ' || string_agg(oid::regprocedure::text, '; DROP FUNCTION ')
  FROM pg_proc
  WHERE proname = _name
  AND pg_function_is_visible(oid)
  INTO functions_dropped, _sql;

  IF functions_dropped > 0 THEN
    EXECUTE _sql;
  END IF;
END
$$;

This function takes a function name as an argument and returns the number of functions dropped. It can be called as follows:

SELECT f_delfunc('my_function_name');

Notes

• The function name in the query and function must be provided without double-quotes and be case-sensitive.
• The query and function will only drop functions in the current search path.
• It's important to note that these methods will also drop overloaded functions with the same name.
• Always execute these commands with caution as they can permanently remove functions from your database.

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