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Update /contrib for "autocommit TO 'on'".
Create objects in public schema. Make spacing/capitalization consistent. Remove transaction block use for object creation. Remove unneeded function GRANTs.
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@ -1,56 +1,62 @@
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--
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-- PostgreSQL code for LargeObjects
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--
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-- $Id: lo.sql.in,v 1.7 2002/08/22 00:01:39 tgl Exp $
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-- $Id: lo.sql.in,v 1.8 2002/10/18 18:41:20 momjian 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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create function lo_in(cstring)
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returns lo
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as 'MODULE_PATHNAME'
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language 'c';
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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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SET autocommit TO 'on';
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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';
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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';
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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';
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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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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';
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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';
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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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-- 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';
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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';
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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';
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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';
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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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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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@ -3,13 +3,18 @@
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-- It's used just for development
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--
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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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SET autocommit TO 'on';
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-- remove our test table
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drop table a;
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DROP TABLE a;
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-- now drop the type and associated C functions
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drop type lo CASCADE;
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DROP TYPE lo CASCADE;
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-- the trigger function has no dependency on the type, so drop separately
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drop function lo_manage();
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DROP FUNCTION lo_manage();
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-- the lo stuff is now removed from the system
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@ -5,53 +5,65 @@
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--
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-- ignore any errors here - simply drop the table if it already exists
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drop table a;
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DROP TABLE a;
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-- create the test table
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create table a (fname name,image lo);
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CREATE TABLE a (fname name,image lo);
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-- insert a null object
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insert into a values ('null');
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INSERT INTO a VALUES ('null');
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-- insert an empty large object
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insert into a values ('empty','');
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INSERT INTO a VALUES ('empty','');
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-- insert a large object based on a file
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insert into a values ('/etc/group',lo_import('/etc/group')::lo);
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INSERT INTO a VALUES ('/etc/group',lo_import('/etc/group')::lo);
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-- now select the table
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select * from a;
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SELECT * FROM a;
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-- this select also returns an oid based on the lo column
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select *,image::oid from a;
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SELECT *,image::oid from a;
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-- now test the trigger
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create trigger t_a before update or delete on a for each row execute procedure lo_manage(image);
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CREATE TRIGGER t_a
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BEFORE UPDATE OR DELETE ON a
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FOR EACH ROW
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EXECUTE PROCEDURE lo_manage(image);
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-- insert
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insert into a values ('aa','');
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select * from a where fname like 'aa%';
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INSERT INTO a VALUES ('aa','');
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SELECT * FROM a
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WHERE fname LIKE 'aa%';
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-- update
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update a set image=lo_import('/etc/group')::lo where fname='aa';
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select * from a where fname like 'aa%';
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UPDATE a SET image=lo_import('/etc/group')::lo
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WHERE fname='aa';
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SELECT * FROM a
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WHERE fname LIKE 'aa%';
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-- update the 'empty' row which should be null
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update a set image=lo_import('/etc/hosts')::lo where fname='empty';
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select * from a where fname like 'empty%';
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update a set image=null where fname='empty';
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select * from a where fname like 'empty%';
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UPDATE a SET image=lo_import('/etc/hosts')::lo
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WHERE fname='empty';
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SELECT * FROM a
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WHERE fname LIKE 'empty%';
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UPDATE a SET image=null
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WHERE fname='empty';
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SELECT * FROM a
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WHERE fname LIKE 'empty%';
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-- delete the entry
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delete from a where fname='aa';
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select * from a where fname like 'aa%';
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DELETE FROM a
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WHERE fname='aa';
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SELECT * FROM a
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WHERE fname LIKE 'aa%';
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-- This deletes the table contents. Note, if you comment this out, and
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-- expect the drop table to remove the objects, think again. The trigger
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-- doesn't get thrown by drop table.
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delete from a;
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DELETE FROM a;
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-- finally drop the table
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drop table a;
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DROP TABLE a;
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-- end of tests
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