postgresql/contrib/lo/lo.sql.in

--
--	PostgreSQL code for LargeObjects
--
--	$Id: lo.sql.in,v 1.1 1998/06/16 07:07:11 momjian Exp $
--

load '_OBJWD_/lo_DLSUFFIX_';

--
--	Create the data type
--

-- used by the lo type, it takes an oid and returns an lo object
create function lo_in(opaque)
	returns opaque
	as '_OBJWD_/lo_DLSUFFIX_'
	language 'c';

-- used by the lo type, it returns the oid of the object
create function lo_out(opaque)
	returns opaque
	as '_OBJWD_/lo_DLSUFFIX_'
	language 'c';

-- finally the type itself
create type lo (
	internallength = 4,
	externallength = variable,
	input = lo_in,
	output = lo_out
);

-- this returns the oid associated with a lo object
create function lo_oid(lo)
	returns oid
	as '_OBJWD_/lo_DLSUFFIX_'
	language 'c';

-- this allows us to convert an oid to a managed lo object
-- ie: insert into test values (lo_import('/fullpath/file')::lo);
create function lo(oid)
	returns lo
	as '_OBJWD_/lo_DLSUFFIX_'
	language 'c';

-- This is used in triggers
create function lo_manage()
	returns opaque
	as '_OBJWD_/lo_DLSUFFIX_'
	language 'c';

-- This allows us to map lo to oid
--
-- eg:
--    create table a (image lo);
--    select image::oid from a;
--
create function oid(lo) returns oid as 'select lo_oid($1)' language 'sql';