63 lines
1.4 KiB
MySQL
63 lines
1.4 KiB
MySQL
--
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-- PostgreSQL code for LargeObjects
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--
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-- $Id: lo.sql.in,v 1.10 2003/05/14 03:25:56 tgl Exp $
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--
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--
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-- Create the data type
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--
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-- used by the lo type, it takes an oid and returns an lo object
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-- Adjust this setting to control where the objects get created.
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SET search_path = public;
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CREATE FUNCTION lo_in(cstring)
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RETURNS lo
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C' IMMUTABLE;
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-- used by the lo type, it returns the oid of the object
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CREATE FUNCTION lo_out(lo)
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RETURNS cstring
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C' IMMUTABLE;
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-- finally the type itself
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CREATE TYPE lo (
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INTERNALLENGTH = 4,
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EXTERNALLENGTH = variable,
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INPUT = lo_in,
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OUTPUT = lo_out
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);
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-- this returns the oid associated with a lo object
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CREATE FUNCTION lo_oid(lo)
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RETURNS oid
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C' IMMUTABLE;
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-- same function, named to allow it to be used as a type coercion, eg:
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-- CREATE TABLE a (image lo);
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-- SELECT image::oid FROM a;
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--
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CREATE FUNCTION oid(lo)
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RETURNS oid
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AS 'MODULE_PATHNAME', 'lo_oid'
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LANGUAGE 'C' IMMUTABLE;
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CREATE CAST (lo as oid) WITH FUNCTION oid(lo) AS IMPLICIT;
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-- this allows us to convert an oid to a managed lo object
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-- ie: insert into test values (lo_import('/fullpath/file')::lo);
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CREATE FUNCTION lo(oid)
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RETURNS lo
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C' IMMUTABLE;
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CREATE CAST (oid as lo) WITH FUNCTION lo(oid) AS IMPLICIT;
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-- This is used in triggers
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CREATE FUNCTION lo_manage()
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RETURNS trigger
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C';
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