create_type.sql

postgresql8.3.4源码,开源数据库

--
-- CREATE_TYPE
--

--
-- Note: widget_in/out were created in create_function_1, without any
-- prior shell-type creation.  These commands therefore complete a test
-- of the "old style" approach of making the functions first.
--
CREATE TYPE widget (
   internallength = 24, 
   input = widget_in,
   output = widget_out,
   typmod_in = numerictypmodin,
   typmod_out = numerictypmodout,
   alignment = double
);

CREATE TYPE city_budget ( 
   internallength = 16, 
   input = int44in, 
   output = int44out, 
   element = int4
);

-- Test creation and destruction of shell types
CREATE TYPE shell;
CREATE TYPE shell;   -- fail, type already present
DROP TYPE shell;
DROP TYPE shell;     -- fail, type not exist

--
-- Test type-related default values (broken in releases before PG 7.2)
--
-- This part of the test also exercises the "new style" approach of making
-- a shell type and then filling it in.
--
CREATE TYPE int42;
CREATE TYPE text_w_default;

-- Make dummy I/O routines using the existing internal support for int4, text
CREATE FUNCTION int42_in(cstring)
   RETURNS int42
   AS 'int4in'
   LANGUAGE internal STRICT;
CREATE FUNCTION int42_out(int42)
   RETURNS cstring
   AS 'int4out'
   LANGUAGE internal STRICT;
CREATE FUNCTION text_w_default_in(cstring)
   RETURNS text_w_default
   AS 'textin'
   LANGUAGE internal STRICT;
CREATE FUNCTION text_w_default_out(text_w_default)
   RETURNS cstring
   AS 'textout'
   LANGUAGE internal STRICT;

CREATE TYPE int42 (
   internallength = 4,
   input = int42_in,
   output = int42_out,
   alignment = int4,
   default = 42,
   passedbyvalue
);

CREATE TYPE text_w_default (
   internallength = variable,
   input = text_w_default_in,
   output = text_w_default_out,
   alignment = int4,
   default = 'zippo'
);

CREATE TABLE default_test (f1 text_w_default, f2 int42);

INSERT INTO default_test DEFAULT VALUES;

SELECT * FROM default_test;

-- Test stand-alone composite type

CREATE TYPE default_test_row AS (f1 text_w_default, f2 int42);

CREATE FUNCTION get_default_test() RETURNS SETOF default_test_row AS '
  SELECT * FROM default_test;
' LANGUAGE SQL;

SELECT * FROM get_default_test();

-- Test comments
COMMENT ON TYPE bad IS 'bad comment';
COMMENT ON TYPE default_test_row IS 'good comment';
COMMENT ON TYPE default_test_row IS NULL;

-- Check shell type create for existing types
CREATE TYPE text_w_default;		-- should fail

DROP TYPE default_test_row CASCADE;

DROP TABLE default_test;

-- Check usage of typmod with a user-defined type
-- (we have borrowed numeric's typmod functions)

CREATE TEMP TABLE mytab (foo widget(42,13,7));     -- should fail
CREATE TEMP TABLE mytab (foo widget(42,13));

SELECT format_type(atttypid,atttypmod) FROM pg_attribute
WHERE attrelid = 'mytab'::regclass AND attnum > 0;