enum.out

来自「postgresql8.3.4源码,开源数据库」· OUT 代码 · 共 408 行

--
-- Enum tests
--
CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple');
--
-- Did it create the right number of rows?
--
SELECT COUNT(*) FROM pg_enum WHERE enumtypid = 'rainbow'::regtype;
 count 
-------
     6
(1 row)

--
-- I/O functions
--
SELECT 'red'::rainbow;
 rainbow 
---------
 red
(1 row)

SELECT 'mauve'::rainbow;
ERROR:  invalid input value for enum rainbow: "mauve"
--
-- Basic table creation, row selection
--
CREATE TABLE enumtest (col rainbow);
INSERT INTO enumtest values ('red'), ('orange'), ('yellow'), ('green');
COPY enumtest FROM stdin;
SELECT * FROM enumtest;
  col   
--------
 red
 orange
 yellow
 green
 blue
 purple
(6 rows)

--
-- Operators, no index
--
SELECT * FROM enumtest WHERE col = 'orange';
  col   
--------
 orange
(1 row)

SELECT * FROM enumtest WHERE col <> 'orange' ORDER BY col;
  col   
--------
 red
 yellow
 green
 blue
 purple
(5 rows)

SELECT * FROM enumtest WHERE col > 'yellow' ORDER BY col;
  col   
--------
 green
 blue
 purple
(3 rows)

SELECT * FROM enumtest WHERE col >= 'yellow' ORDER BY col;
  col   
--------
 yellow
 green
 blue
 purple
(4 rows)

SELECT * FROM enumtest WHERE col < 'green' ORDER BY col;
  col   
--------
 red
 orange
 yellow
(3 rows)

SELECT * FROM enumtest WHERE col <= 'green' ORDER BY col;
  col   
--------
 red
 orange
 yellow
 green
(4 rows)

--
-- Cast to/from text
--
SELECT 'red'::rainbow::text || 'hithere';
  ?column?  
------------
 redhithere
(1 row)

SELECT 'red'::text::rainbow = 'red'::rainbow;
 ?column? 
----------
 t
(1 row)

--
-- Aggregates
--
SELECT min(col) FROM enumtest;
 min 
-----
 red
(1 row)

SELECT max(col) FROM enumtest;
  max   
--------
 purple
(1 row)

SELECT max(col) FROM enumtest WHERE col < 'green';
  max   
--------
 yellow
(1 row)

--
-- Index tests, force use of index
--
SET enable_seqscan = off;
SET enable_bitmapscan = off;
--
-- Btree index / opclass with the various operators
--
CREATE UNIQUE INDEX enumtest_btree ON enumtest USING btree (col);
SELECT * FROM enumtest WHERE col = 'orange';
  col   
--------
 orange
(1 row)

SELECT * FROM enumtest WHERE col <> 'orange' ORDER BY col;
  col   
--------
 red
 yellow
 green
 blue
 purple
(5 rows)

SELECT * FROM enumtest WHERE col > 'yellow' ORDER BY col;
  col   
--------
 green
 blue
 purple
(3 rows)

SELECT * FROM enumtest WHERE col >= 'yellow' ORDER BY col;
  col   
--------
 yellow
 green
 blue
 purple
(4 rows)

SELECT * FROM enumtest WHERE col < 'green' ORDER BY col;
  col   
--------
 red
 orange
 yellow
(3 rows)

SELECT * FROM enumtest WHERE col <= 'green' ORDER BY col;
  col   
--------
 red
 orange
 yellow
 green
(4 rows)

SELECT min(col) FROM enumtest;
 min 
-----
 red
(1 row)

SELECT max(col) FROM enumtest;
  max   
--------
 purple
(1 row)

SELECT max(col) FROM enumtest WHERE col < 'green';
  max   
--------
 yellow
(1 row)

DROP INDEX enumtest_btree;
--
-- Hash index / opclass with the = operator
--
CREATE INDEX enumtest_hash ON enumtest USING hash (col);
SELECT * FROM enumtest WHERE col = 'orange';
  col   
--------
 orange
(1 row)

DROP INDEX enumtest_hash;
--
-- End index tests
--
RESET enable_seqscan;
RESET enable_bitmapscan;
--
-- Domains over enums
--
CREATE DOMAIN rgb AS rainbow CHECK (VALUE IN ('red', 'green', 'blue'));
SELECT 'red'::rgb;
 rgb 
-----
 red
(1 row)

SELECT 'purple'::rgb;
ERROR:  value for domain rgb violates check constraint "rgb_check"
SELECT 'purple'::rainbow::rgb;
ERROR:  value for domain rgb violates check constraint "rgb_check"
DROP DOMAIN rgb;
--
-- Arrays
--
SELECT '{red,green,blue}'::rainbow[];
     rainbow      
------------------
 {red,green,blue}
(1 row)

SELECT ('{red,green,blue}'::rainbow[])[2];
 rainbow 
---------
 green
(1 row)

SELECT 'red' = ANY ('{red,green,blue}'::rainbow[]);
 ?column? 
----------
 t
(1 row)

SELECT 'yellow' = ANY ('{red,green,blue}'::rainbow[]);
 ?column? 
----------
 f
(1 row)

SELECT 'red' = ALL ('{red,green,blue}'::rainbow[]);
 ?column? 
----------
 f
(1 row)

SELECT 'red' = ALL ('{red,red}'::rainbow[]);
 ?column? 
----------
 t
(1 row)

--
-- Support functions
--
SELECT enum_first(NULL::rainbow);
 enum_first 
------------
 red
(1 row)

SELECT enum_last('green'::rainbow);
 enum_last 
-----------
 purple
(1 row)

SELECT enum_range(NULL::rainbow);
              enum_range               
---------------------------------------
 {red,orange,yellow,green,blue,purple}
(1 row)

SELECT enum_range('orange'::rainbow, 'green'::rainbow);
      enum_range       
-----------------------
 {orange,yellow,green}
(1 row)

SELECT enum_range(NULL, 'green'::rainbow);
        enum_range         
---------------------------
 {red,orange,yellow,green}
(1 row)

SELECT enum_range('orange'::rainbow, NULL);
            enum_range             
-----------------------------------
 {orange,yellow,green,blue,purple}
(1 row)

SELECT enum_range(NULL::rainbow, NULL);
              enum_range               
---------------------------------------
 {red,orange,yellow,green,blue,purple}
(1 row)

--
-- User functions, can't test perl/python etc here since may not be compiled.
--
CREATE FUNCTION echo_me(anyenum) RETURNS text AS $$
BEGIN
RETURN $1::text || 'omg';
END
$$ LANGUAGE plpgsql;
SELECT echo_me('red'::rainbow);
 echo_me 
---------
 redomg
(1 row)

--
-- Concrete function should override generic one
--
CREATE FUNCTION echo_me(rainbow) RETURNS text AS $$
BEGIN
RETURN $1::text || 'wtf';
END
$$ LANGUAGE plpgsql;
SELECT echo_me('red'::rainbow);
 echo_me 
---------
 redwtf
(1 row)

--
-- If we drop the original generic one, we don't have to qualify the type
-- anymore, since there's only one match
--
DROP FUNCTION echo_me(anyenum);
SELECT echo_me('red');
 echo_me 
---------
 redwtf
(1 row)

DROP FUNCTION echo_me(rainbow);
--
-- RI triggers on enum types
--
CREATE TABLE enumtest_parent (id rainbow PRIMARY KEY);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "enumtest_parent_pkey" for table "enumtest_parent"
CREATE TABLE enumtest_child (parent rainbow REFERENCES enumtest_parent);
INSERT INTO enumtest_parent VALUES ('red');
INSERT INTO enumtest_child VALUES ('red');
INSERT INTO enumtest_child VALUES ('blue');  -- fail
ERROR:  insert or update on table "enumtest_child" violates foreign key constraint "enumtest_child_parent_fkey"
DETAIL:  Key (parent)=(blue) is not present in table "enumtest_parent".
DELETE FROM enumtest_parent;  -- fail
ERROR:  update or delete on table "enumtest_parent" violates foreign key constraint "enumtest_child_parent_fkey" on table "enumtest_child"
DETAIL:  Key (id)=(red) is still referenced from table "enumtest_child".
--
-- cross-type RI should fail
--
CREATE TYPE bogus AS ENUM('good', 'bad', 'ugly');
CREATE TABLE enumtest_bogus_child(parent bogus REFERENCES enumtest_parent);
ERROR:  foreign key constraint "enumtest_bogus_child_parent_fkey" cannot be implemented
DETAIL:  Key columns "parent" and "id" are of incompatible types: bogus and rainbow.
DROP TYPE bogus;
--
-- Cleanup
--
DROP TABLE enumtest_child;
DROP TABLE enumtest_parent;
DROP TABLE enumtest;
DROP TYPE rainbow;
--
-- Verify properly cleaned up
--
SELECT COUNT(*) FROM pg_type WHERE typname = 'rainbow';
 count 
-------
     0
(1 row)

SELECT * FROM pg_enum WHERE NOT EXISTS
  (SELECT 1 FROM pg_type WHERE pg_type.oid = enumtypid);
 enumtypid | enumlabel 
-----------+-----------
(0 rows)