rowtypes.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

--
-- ROWTYPES
--
-- Make both a standalone composite type and a table rowtype
create type complex as (r float8, i float8);
create temp table fullname (first text, last text);
-- Nested composite
create type quad as (c1 complex, c2 complex);
-- Some simple tests of I/O conversions and row construction
select (1.1,2.2)::complex, row((3.3,4.4),(5.5,null))::quad;
    row    |          row           
-----------+------------------------
 (1.1,2.2) | ("(3.3,4.4)","(5.5,)")
(1 row)

select row('Joe', 'Blow')::fullname, '(Joe,Blow)'::fullname;
    row     |  fullname  
------------+------------
 (Joe,Blow) | (Joe,Blow)
(1 row)

select '(Joe,von Blow)'::fullname, '(Joe,d''Blow)'::fullname;
     fullname     |   fullname   
------------------+--------------
 (Joe,"von Blow") | (Joe,d'Blow)
(1 row)

select '(Joe,"von""Blow")'::fullname, E'(Joe,d\\\\Blow)'::fullname;
     fullname      |    fullname     
-------------------+-----------------
 (Joe,"von""Blow") | (Joe,"d\\Blow")
(1 row)

select '(Joe,"Blow,Jr")'::fullname;
    fullname     
-----------------
 (Joe,"Blow,Jr")
(1 row)

select '(Joe,)'::fullname;	-- ok, null 2nd column
 fullname 
----------
 (Joe,)
(1 row)

select '(Joe)'::fullname;	-- bad
ERROR:  malformed record literal: "(Joe)"
DETAIL:  Too few columns.
select '(Joe,,)'::fullname;	-- bad
ERROR:  malformed record literal: "(Joe,,)"
DETAIL:  Too many columns.
create temp table quadtable(f1 int, q quad);
insert into quadtable values (1, ((3.3,4.4),(5.5,6.6)));
insert into quadtable values (2, ((null,4.4),(5.5,6.6)));
select * from quadtable;
 f1 |             q             
----+---------------------------
  1 | ("(3.3,4.4)","(5.5,6.6)")
  2 | ("(,4.4)","(5.5,6.6)")
(2 rows)

select f1, q.c1 from quadtable;		-- fails, q is a table reference
ERROR:  missing FROM-clause entry for table "q"
select f1, (q).c1, (qq.q).c1.i from quadtable qq;
 f1 |    c1     |  i  
----+-----------+-----
  1 | (3.3,4.4) | 4.4
  2 | (,4.4)    | 4.4
(2 rows)

create temp table people (fn fullname, bd date);
insert into people values ('(Joe,Blow)', '1984-01-10');
select * from people;
     fn     |     bd     
------------+------------
 (Joe,Blow) | 01-10-1984
(1 row)

-- at the moment this will not work due to ALTER TABLE inadequacy:
alter table fullname add column suffix text default '';
ERROR:  cannot alter table "fullname" because column "people"."fn" uses its rowtype
-- but this should work:
alter table fullname add column suffix text default null;
select * from people;
     fn      |     bd     
-------------+------------
 (Joe,Blow,) | 01-10-1984
(1 row)

-- test insertion/updating of subfields
update people set fn.suffix = 'Jr';
select * from people;
      fn       |     bd     
---------------+------------
 (Joe,Blow,Jr) | 01-10-1984
(1 row)

insert into quadtable (f1, q.c1.r, q.c2.i) values(44,55,66);
select * from quadtable;
 f1 |             q             
----+---------------------------
  1 | ("(3.3,4.4)","(5.5,6.6)")
  2 | ("(,4.4)","(5.5,6.6)")
 44 | ("(55,)","(,66)")
(3 rows)

-- The object here is to ensure that toasted references inside
-- composite values don't cause problems.  The large f1 value will
-- be toasted inside pp, it must still work after being copied to people.
create temp table pp (f1 text);
insert into pp values (repeat('abcdefghijkl', 100000));
insert into people select ('Jim', f1, null)::fullname, current_date from pp;
select (fn).first, substr((fn).last, 1, 20), length((fn).last) from people;
 first |        substr        | length  
-------+----------------------+---------
 Joe   | Blow                 |       4
 Jim   | abcdefghijklabcdefgh | 1200000
(2 rows)