Thread: Deleting Functions

Folks,

I am using PGSQL do do all of my schema changes, but have run into a 
problem.  I need to be able to DROP all of the USER FUNCTIONS that are 
defined in a schema.  The problem is that I do not know the names of all 
of the functions and parameters.  I know that I could use '\df' and then 
use perl or some other scripting language to parse this, but I need to 
be able to perform this action on multiple platforms (without rewriting 
the process for each platform). 

I have written a script that incorporates '\df' and appropriate parsing 
to perform this action for LINUX and it works fine/lasts a long time.  I 
need to make this more transparent so it will run on all platforms (in 
particular windows).

I know that in the past (version 7) there was a way to drop the 
functions by directly accessing some of the system tables.  The 
question/problem is that we have updated to version 8.1 and need the 
same functionality.



Any help or directions would be greatly appreciated.

Thanks Scott.

Scott,

I use the following query with psql \o option.  Change the schema name from public to whatever.  I am sure you could
put
this into a plpgsql function using execute as well.


Jim

\o drops.sql
select 'drop function ' || nspname || '.' || proname || '(' || pg_catalog.oidvectortypes(p.proargtypes) || ');' from
pg_proc p join pg_namespace b on (p.pronamespace=b.oid) where nspname='public';
\o
\!vi drops.sql # <<remove the fluff from the query 
\i drops.sql




---------- Original Message -----------
From: Scott Petersen <scottpetersen@softhome.net>
To: pgsql-sql@postgresql.org
Sent: Wed, 23 Aug 2006 13:29:12 -0600
Subject: [SQL] Deleting Functions

> Folks,
> 
> I am using PGSQL do do all of my schema changes, but have run into a 
> problem.  I need to be able to DROP all of the USER FUNCTIONS that are 
> defined in a schema.  The problem is that I do not know the names of all 
> of the functions and parameters.  I know that I could use '\df' and then 
> use perl or some other scripting language to parse this, but I need to 
> be able to perform this action on multiple platforms (without rewriting 
> the process for each platform).
> 
> I have written a script that incorporates '\df' and appropriate parsing 
> to perform this action for LINUX and it works fine/lasts a long time.  I 
> need to make this more transparent so it will run on all platforms (in 
> particular windows).
> 
> I know that in the past (version 7) there was a way to drop the 
> functions by directly accessing some of the system tables.  The 
> question/problem is that we have updated to version 8.1 and need the 
> same functionality.
> 
> Any help or directions would be greatly appreciated.
> 
> Thanks Scott.
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
------- End of Original Message -------

"Jim Buttafuoco" <jim@contactbda.com> writes:
> select 'drop function ' || nspname || '.' || proname || '(' || pg_catalog.oidvectortypes(p.proargtypes) || ');' from
> pg_proc p join pg_namespace b on (p.pronamespace=b.oid) where nspname='public';

Seems like you could do that more easily with regprocedure:

select 'drop function ' || p.oid::regprocedure || ';' from
pg_proc p join pg_namespace b on (p.pronamespace=b.oid) where nspname='public';

[ tries it ... ] ... except that there's no regprocedure-to-text cast.
How annoying :-(
        regards, tom lane

Thanks for those who responded.  It works fine and lasts a long time.  
The following script does NOT require any editing.  It simply executes 
and works.

\pset format unaligned
\pset fieldsep ''
\pset footer
\t
\o drops.sql
select 'drop function ' || nspname || '.' || proname || '(' || 
pg_catalog.oidvectortypes(p.proargtypes) || ') CASCADE;' from
pg_proc p join pg_namespace b on (p.pronamespace=b.oid) where 
nspname='public';
\o
\i drops.sql

Scott.


Jim Buttafuoco wrote:
> Scott,
>
> I use the following query with psql \o option.  Change the schema name from public to whatever.  I am sure you could
put
> this into a plpgsql function using execute as well.
>
>
> Jim
>
> \o drops.sql
> select 'drop function ' || nspname || '.' || proname || '(' || pg_catalog.oidvectortypes(p.proargtypes) || ');' from
> pg_proc p join pg_namespace b on (p.pronamespace=b.oid) where nspname='public';
> \o
> \!vi drops.sql # <<remove the fluff from the query 
> \i drops.sql
>
>
>
>
>