inherit.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

 c       | cccccc   | 
 c       | ccccccc  | 
 c       | cccccccc | 
 d       | new      | 
 d       | new      | 
 d       | new      | 
 d       | new      | 
 d       | new      | 
 d       | new      | 
(12 rows)

SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
 relname | aa  | bb | cc | dd 
---------+-----+----+----+----
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
(6 rows)

SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
 relname |   aa   
---------+--------
 a       | zzzz
 a       | zzzzz
 a       | zzzzzz
 a       | zzzzzz
 a       | zzzzzz
 a       | zzzzzz
(6 rows)

SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
 relname | aa  | bb 
---------+-----+----
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
(6 rows)

SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
 relname |    aa    | cc 
---------+----------+----
 c       | ccc      | 
 c       | cccc     | 
 c       | ccccc    | 
 c       | cccccc   | 
 c       | ccccccc  | 
 c       | cccccccc | 
(6 rows)

SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
 relname | aa  | bb | cc | dd 
---------+-----+----+----+----
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
(6 rows)

UPDATE a SET aa='new';
DELETE FROM ONLY c WHERE aa='new';
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
 relname | aa  
---------+-----
 a       | new
 a       | new
 a       | new
 a       | new
 a       | new
 a       | new
 b       | new
 b       | new
 b       | new
 b       | new
 b       | new
 b       | new
 d       | new
 d       | new
 d       | new
 d       | new
 d       | new
 d       | new
(18 rows)

SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
 relname | aa  | bb 
---------+-----+----
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
(12 rows)

SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
 relname | aa  | cc 
---------+-----+----
 d       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
 d       | new | 
(6 rows)

SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
 relname | aa  | bb | cc | dd 
---------+-----+----+----+----
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
(6 rows)

SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
 relname | aa  
---------+-----
 a       | new
 a       | new
 a       | new
 a       | new
 a       | new
 a       | new
(6 rows)

SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
 relname | aa  | bb 
---------+-----+----
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
 b       | new | 
(6 rows)

SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
 relname | aa | cc 
---------+----+----
(0 rows)

SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
 relname | aa  | bb | cc | dd 
---------+-----+----+----+----
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
 d       | new |    |    | 
(6 rows)

DELETE FROM a;
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
 relname | aa 
---------+----
(0 rows)

SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
 relname | aa | bb 
---------+----+----
(0 rows)

SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
 relname | aa | cc 
---------+----+----
(0 rows)

SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
 relname | aa | bb | cc | dd 
---------+----+----+----+----
(0 rows)

SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
 relname | aa 
---------+----
(0 rows)

SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
 relname | aa | bb 
---------+----+----
(0 rows)

SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
 relname | aa | cc 
---------+----+----
(0 rows)

SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
 relname | aa | bb | cc | dd 
---------+----+----+----+----
(0 rows)

-- Confirm PRIMARY KEY adds NOT NULL constraint to child table
CREATE TEMP TABLE z (b TEXT, PRIMARY KEY(aa, b)) inherits (a);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "z_pkey" for table "z"
INSERT INTO z VALUES (NULL, 'text'); -- should fail
ERROR:  null value in column "aa" violates not-null constraint
-- Check UPDATE with inherited target and an inherited source table
create temp table foo(f1 int, f2 int);
create temp table foo2(f3 int) inherits (foo);
create temp table bar(f1 int, f2 int);
create temp table bar2(f3 int) inherits (bar);
insert into foo values(1,1);
insert into foo values(3,3);
insert into foo2 values(2,2,2);
insert into foo2 values(3,3,3);
insert into bar values(1,1);
insert into bar values(2,2);
insert into bar values(3,3);
insert into bar values(4,4);
insert into bar2 values(1,1,1);
insert into bar2 values(2,2,2);
insert into bar2 values(3,3,3);
insert into bar2 values(4,4,4);
update bar set f2 = f2 + 100 where f1 in (select f1 from foo);
SELECT relname, bar.* FROM bar, pg_class where bar.tableoid = pg_class.oid
order by 1,2;
 relname | f1 | f2  
---------+----+-----
 bar     |  1 | 101
 bar     |  2 | 102
 bar     |  3 | 103
 bar     |  4 |   4
 bar2    |  1 | 101
 bar2    |  2 | 102
 bar2    |  3 | 103
 bar2    |  4 |   4
(8 rows)

/* Test inheritance of structure (LIKE) */
CREATE TABLE inhx (xx text DEFAULT 'text');
/*
 * Test double inheritance
 *
 * Ensure that defaults are NOT included unless
 * INCLUDING DEFAULTS is specified 
 */
CREATE TABLE inhe (ee text, LIKE inhx) inherits (b);
INSERT INTO inhe VALUES ('ee-col1', 'ee-col2', DEFAULT, 'ee-col4');
SELECT * FROM inhe; /* Columns aa, bb, xx value NULL, ee */
   aa    |   bb    | ee |   xx    
---------+---------+----+---------
 ee-col1 | ee-col2 |    | ee-col4
(1 row)

SELECT * FROM inhx; /* Empty set since LIKE inherits structure only */
 xx 
----
(0 rows)

SELECT * FROM b; /* Has ee entry */
   aa    |   bb    
---------+---------
 ee-col1 | ee-col2
(1 row)

SELECT * FROM a; /* Has ee entry */
   aa    
---------
 ee-col1
(1 row)

CREATE TABLE inhf (LIKE inhx, LIKE inhx); /* Throw error */
ERROR:  column "xx" duplicated
CREATE TABLE inhf (LIKE inhx INCLUDING DEFAULTS);
INSERT INTO inhf DEFAULT VALUES;
SELECT * FROM inhf; /* Single entry with value 'text' */
  xx  
------
 text
(1 row)

-- Test changing the type of inherited columns
insert into d values('test','one','two','three');
alter table a alter column aa type integer using bit_length(aa);
select * from d;
 aa | bb  | cc  |  dd   
----+-----+-----+-------
 32 | one | two | three
(1 row)

-- Tests for casting between the rowtypes of parent and child
-- tables. See the pgsql-hackers thread beginning Dec. 4/04
create table base (i integer);
create table derived () inherits (base);
insert into derived (i) values (0);
select derived::base from derived;
 derived 
---------
 (0)
(1 row)

drop table derived;
drop table base;
create table p1(ff1 int);
create table p2(f1 text);
create function p2text(p2) returns text as 'select $1.f1' language sql;
create table c1(f3 int) inherits(p1,p2);
insert into c1 values(123456789, 'hi', 42);
select p2text(c1.*) from c1;
 p2text 
--------
 hi
(1 row)

drop function p2text(p2);
drop table c1;
drop table p2;
drop table p1;