returning.out

来自「postgresql8.3.4源码,开源数据库」· OUT 代码 · 共 335 行

--
-- Test INSERT/UPDATE/DELETE RETURNING
--
-- Simple cases
CREATE TEMP TABLE foo (f1 serial, f2 text, f3 int default 42);
NOTICE:  CREATE TABLE will create implicit sequence "foo_f1_seq" for serial column "foo.f1"
INSERT INTO foo (f2,f3)
  VALUES ('test', DEFAULT), ('More', 11), (upper('more'), 7+9)
  RETURNING *, f1+f3 AS sum;
 f1 |  f2  | f3 | sum 
----+------+----+-----
  1 | test | 42 |  43
  2 | More | 11 |  13
  3 | MORE | 16 |  19
(3 rows)

SELECT * FROM foo;
 f1 |  f2  | f3 
----+------+----
  1 | test | 42
  2 | More | 11
  3 | MORE | 16
(3 rows)

UPDATE foo SET f2 = lower(f2), f3 = DEFAULT RETURNING foo.*, f1+f3 AS sum13;
 f1 |  f2  | f3 | sum13 
----+------+----+-------
  1 | test | 42 |    43
  2 | more | 42 |    44
  3 | more | 42 |    45
(3 rows)

SELECT * FROM foo;
 f1 |  f2  | f3 
----+------+----
  1 | test | 42
  2 | more | 42
  3 | more | 42
(3 rows)

DELETE FROM foo WHERE f1 > 2 RETURNING f3, f2, f1, least(f1,f3);
 f3 |  f2  | f1 | least 
----+------+----+-------
 42 | more |  3 |     3
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 
----+------+----
  1 | test | 42
  2 | more | 42
(2 rows)

-- Subplans and initplans in the RETURNING list
INSERT INTO foo SELECT f1+10, f2, f3+99 FROM foo
  RETURNING *, f1+112 IN (SELECT q1 FROM int8_tbl) AS subplan,
    EXISTS(SELECT * FROM int4_tbl) AS initplan;
 f1 |  f2  | f3  | subplan | initplan 
----+------+-----+---------+----------
 11 | test | 141 | t       | t
 12 | more | 141 | f       | t
(2 rows)

UPDATE foo SET f3 = f3 * 2
  WHERE f1 > 10
  RETURNING *, f1+112 IN (SELECT q1 FROM int8_tbl) AS subplan,
    EXISTS(SELECT * FROM int4_tbl) AS initplan;
 f1 |  f2  | f3  | subplan | initplan 
----+------+-----+---------+----------
 11 | test | 282 | t       | t
 12 | more | 282 | f       | t
(2 rows)

DELETE FROM foo
  WHERE f1 > 10
  RETURNING *, f1+112 IN (SELECT q1 FROM int8_tbl) AS subplan,
    EXISTS(SELECT * FROM int4_tbl) AS initplan;
 f1 |  f2  | f3  | subplan | initplan 
----+------+-----+---------+----------
 11 | test | 282 | t       | t
 12 | more | 282 | f       | t
(2 rows)

-- Joins
UPDATE foo SET f3 = f3*2
  FROM int4_tbl i
  WHERE foo.f1 + 123455 = i.f1
  RETURNING foo.*, i.f1 as "i.f1";
 f1 |  f2  | f3 |  i.f1  
----+------+----+--------
  1 | test | 84 | 123456
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 
----+------+----
  2 | more | 42
  1 | test | 84
(2 rows)

DELETE FROM foo
  USING int4_tbl i
  WHERE foo.f1 + 123455 = i.f1
  RETURNING foo.*, i.f1 as "i.f1";
 f1 |  f2  | f3 |  i.f1  
----+------+----+--------
  1 | test | 84 | 123456
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 
----+------+----
  2 | more | 42
(1 row)

-- Check inheritance cases
CREATE TEMP TABLE foochild (fc int) INHERITS (foo);
INSERT INTO foochild VALUES(123,'child',999,-123);
ALTER TABLE foo ADD COLUMN f4 int8 DEFAULT 99;
SELECT * FROM foo;
 f1  |  f2   | f3  | f4 
-----+-------+-----+----
   2 | more  |  42 | 99
 123 | child | 999 | 99
(2 rows)

SELECT * FROM foochild;
 f1  |  f2   | f3  |  fc  | f4 
-----+-------+-----+------+----
 123 | child | 999 | -123 | 99
(1 row)

UPDATE foo SET f4 = f4 + f3 WHERE f4 = 99 RETURNING *;
 f1  |  f2   | f3  |  f4  
-----+-------+-----+------
   2 | more  |  42 |  141
 123 | child | 999 | 1098
(2 rows)

SELECT * FROM foo;
 f1  |  f2   | f3  |  f4  
-----+-------+-----+------
   2 | more  |  42 |  141
 123 | child | 999 | 1098
(2 rows)

SELECT * FROM foochild;
 f1  |  f2   | f3  |  fc  |  f4  
-----+-------+-----+------+------
 123 | child | 999 | -123 | 1098
(1 row)

UPDATE foo SET f3 = f3*2
  FROM int8_tbl i
  WHERE foo.f1 = i.q2
  RETURNING *;
 f1  |  f2   |  f3  |  f4  |        q1        | q2  
-----+-------+------+------+------------------+-----
 123 | child | 1998 | 1098 | 4567890123456789 | 123
(1 row)

SELECT * FROM foo;
 f1  |  f2   |  f3  |  f4  
-----+-------+------+------
   2 | more  |   42 |  141
 123 | child | 1998 | 1098
(2 rows)

SELECT * FROM foochild;
 f1  |  f2   |  f3  |  fc  |  f4  
-----+-------+------+------+------
 123 | child | 1998 | -123 | 1098
(1 row)

DELETE FROM foo
  USING int8_tbl i
  WHERE foo.f1 = i.q2
  RETURNING *;
 f1  |  f2   |  f3  |  f4  |        q1        | q2  
-----+-------+------+------+------------------+-----
 123 | child | 1998 | 1098 | 4567890123456789 | 123
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 | f4  
----+------+----+-----
  2 | more | 42 | 141
(1 row)

SELECT * FROM foochild;
 f1 | f2 | f3 | fc | f4 
----+----+----+----+----
(0 rows)

DROP TABLE foochild;
-- Rules and views
CREATE TEMP VIEW voo AS SELECT f1, f2 FROM foo;
CREATE RULE voo_i AS ON INSERT TO voo DO INSTEAD
  INSERT INTO foo VALUES(new.*, 57);
INSERT INTO voo VALUES(11,'zit');
-- fails:
INSERT INTO voo VALUES(12,'zoo') RETURNING *, f1*2;
ERROR:  cannot perform INSERT RETURNING on relation "voo"
HINT:  You need an unconditional ON INSERT DO INSTEAD rule with a RETURNING clause.
-- fails, incompatible list:
CREATE OR REPLACE RULE voo_i AS ON INSERT TO voo DO INSTEAD
  INSERT INTO foo VALUES(new.*, 57) RETURNING *;
ERROR:  RETURNING list has too many entries
CREATE OR REPLACE RULE voo_i AS ON INSERT TO voo DO INSTEAD
  INSERT INTO foo VALUES(new.*, 57) RETURNING f1, f2;
-- should still work
INSERT INTO voo VALUES(13,'zit2');
-- works now
INSERT INTO voo VALUES(14,'zoo2') RETURNING *;
 f1 |  f2  
----+------
 14 | zoo2
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 | f4  
----+------+----+-----
  2 | more | 42 | 141
 11 | zit  | 57 |  99
 13 | zit2 | 57 |  99
 14 | zoo2 | 57 |  99
(4 rows)

SELECT * FROM voo;
 f1 |  f2  
----+------
  2 | more
 11 | zit
 13 | zit2
 14 | zoo2
(4 rows)

CREATE OR REPLACE RULE voo_u AS ON UPDATE TO voo DO INSTEAD
  UPDATE foo SET f1 = new.f1, f2 = new.f2 WHERE f1 = old.f1
  RETURNING f1, f2;
update voo set f1 = f1 + 1 where f2 = 'zoo2';
update voo set f1 = f1 + 1 where f2 = 'zoo2' RETURNING *, f1*2;
 f1 |  f2  | ?column? 
----+------+----------
 16 | zoo2 |       32
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 | f4  
----+------+----+-----
  2 | more | 42 | 141
 11 | zit  | 57 |  99
 13 | zit2 | 57 |  99
 16 | zoo2 | 57 |  99
(4 rows)

SELECT * FROM voo;
 f1 |  f2  
----+------
  2 | more
 11 | zit
 13 | zit2
 16 | zoo2
(4 rows)

CREATE OR REPLACE RULE voo_d AS ON DELETE TO voo DO INSTEAD
  DELETE FROM foo WHERE f1 = old.f1
  RETURNING f1, f2;
DELETE FROM foo WHERE f1 = 13;
DELETE FROM foo WHERE f2 = 'zit' RETURNING *;
 f1 | f2  | f3 | f4 
----+-----+----+----
 11 | zit | 57 | 99
(1 row)

SELECT * FROM foo;
 f1 |  f2  | f3 | f4  
----+------+----+-----
  2 | more | 42 | 141
 16 | zoo2 | 57 |  99
(2 rows)

SELECT * FROM voo;
 f1 |  f2  
----+------
  2 | more
 16 | zoo2
(2 rows)

-- Try a join case
CREATE TEMP TABLE joinme (f2j text, other int);
INSERT INTO joinme VALUES('more', 12345);
INSERT INTO joinme VALUES('zoo2', 54321);
INSERT INTO joinme VALUES('other', 0);
CREATE TEMP VIEW joinview AS
  SELECT foo.*, other FROM foo JOIN joinme ON (f2 = f2j);
SELECT * FROM joinview;
 f1 |  f2  | f3 | f4  | other 
----+------+----+-----+-------
  2 | more | 42 | 141 | 12345
 16 | zoo2 | 57 |  99 | 54321
(2 rows)

CREATE RULE joinview_u AS ON UPDATE TO joinview DO INSTEAD
  UPDATE foo SET f1 = new.f1, f3 = new.f3
    FROM joinme WHERE f2 = f2j AND f2 = old.f2
    RETURNING foo.*, other;
UPDATE joinview SET f1 = f1 + 1 WHERE f3 = 57 RETURNING *, other + 1;
 f1 |  f2  | f3 | f4 | other | ?column? 
----+------+----+----+-------+----------
 17 | zoo2 | 57 | 99 | 54321 |    54322
(1 row)

SELECT * FROM joinview;
 f1 |  f2  | f3 | f4  | other 
----+------+----+-----+-------
  2 | more | 42 | 141 | 12345
 17 | zoo2 | 57 |  99 | 54321
(2 rows)

SELECT * FROM foo;
 f1 |  f2  | f3 | f4  
----+------+----+-----
  2 | more | 42 | 141
 17 | zoo2 | 57 |  99
(2 rows)

SELECT * FROM voo;
 f1 |  f2  
----+------
  2 | more
 17 | zoo2
(2 rows)