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|
checkpoint;
CREATE OR REPLACE FUNCTION perl_int(int) RETURNS INTEGER AS $$
return undef;
$$ LANGUAGE plperl;
SELECT perl_int(11);
perl_int
----------
(1 row)
SELECT * FROM perl_int(42);
perl_int
----------
(1 row)
CREATE OR REPLACE FUNCTION perl_int(int) RETURNS INTEGER AS $$
return $_[0] + 1;
$$ LANGUAGE plperl;
SELECT perl_int(11);
perl_int
----------
12
(1 row)
SELECT * FROM perl_int(42);
perl_int
----------
43
(1 row)
CREATE OR REPLACE FUNCTION perl_set_int(int) RETURNS SETOF INTEGER AS $$
return undef;
$$ LANGUAGE plperl;
SELECT perl_set_int(5);
perl_set_int
--------------
(0 rows)
SELECT * FROM perl_set_int(5);
perl_set_int
--------------
(0 rows)
CREATE OR REPLACE FUNCTION perl_set_int(int) RETURNS SETOF INTEGER AS $$
return [0..$_[0]];
$$ LANGUAGE plperl;
SELECT perl_set_int(5);
perl_set_int
--------------
0
1
2
3
4
5
(6 rows)
SELECT * FROM perl_set_int(5);
perl_set_int
--------------
0
1
2
3
4
5
(6 rows)
CREATE TYPE testrowperl AS (f1 integer, f2 text, f3 text);
CREATE OR REPLACE FUNCTION perl_row() RETURNS testrowperl AS $$
return undef;
$$ LANGUAGE plperl;
SELECT perl_row();
perl_row
----------
(1 row)
SELECT * FROM perl_row();
f1 | f2 | f3
----+----+----
| |
(1 row)
CREATE OR REPLACE FUNCTION perl_row() RETURNS testrowperl AS $$
return {f2 => 'hello', f1 => 1, f3 => 'world'};
$$ LANGUAGE plperl;
SELECT perl_row();
perl_row
-----------------
(1,hello,world)
(1 row)
SELECT * FROM perl_row();
f1 | f2 | f3
----+-------+-------
1 | hello | world
(1 row)
CREATE OR REPLACE FUNCTION perl_set() RETURNS SETOF testrowperl AS $$
return undef;
$$ LANGUAGE plperl;
SELECT perl_set();
perl_set
----------
(0 rows)
SELECT * FROM perl_set();
f1 | f2 | f3
----+----+----
(0 rows)
CREATE OR REPLACE FUNCTION perl_set() RETURNS SETOF testrowperl AS $$
return [
{ f1 => 1, f2 => 'Hello', f3 => 'World' },
undef,
{ f1 => 3, f2 => 'Hello', f3 => 'PL/Perl' }
];
$$ LANGUAGE plperl;
SELECT perl_set();
ERROR: elements of Perl result array must be reference to hash
SELECT * FROM perl_set();
ERROR: elements of Perl result array must be reference to hash
CREATE OR REPLACE FUNCTION perl_set() RETURNS SETOF testrowperl AS $$
return [
{ f1 => 1, f2 => 'Hello', f3 => 'World' },
{ f1 => 2, f2 => 'Hello', f3 => 'PostgreSQL' },
{ f1 => 3, f2 => 'Hello', f3 => 'PL/Perl' }
];
$$ LANGUAGE plperl;
SELECT perl_set();
perl_set
----------------------
(1,Hello,World)
(2,Hello,PostgreSQL)
(3,Hello,PL/Perl)
(3 rows)
SELECT * FROM perl_set();
f1 | f2 | f3
----+-------+------------
1 | Hello | World
2 | Hello | PostgreSQL
3 | Hello | PL/Perl
(3 rows)
CREATE OR REPLACE FUNCTION perl_record() RETURNS record AS $$
return undef;
$$ LANGUAGE plperl;
SELECT perl_record();
perl_record
-------------
(1 row)
SELECT * FROM perl_record();
ERROR: a column definition list is required for functions returning "record"
SELECT * FROM perl_record() AS (f1 integer, f2 text, f3 text);
f1 | f2 | f3
----+----+----
| |
(1 row)
CREATE OR REPLACE FUNCTION perl_record() RETURNS record AS $$
return {f2 => 'hello', f1 => 1, f3 => 'world'};
$$ LANGUAGE plperl;
SELECT perl_record();
ERROR: function returning record called in context that cannot accept type record
SELECT * FROM perl_record();
ERROR: a column definition list is required for functions returning "record"
SELECT * FROM perl_record() AS (f1 integer, f2 text, f3 text);
f1 | f2 | f3
----+-------+-------
1 | hello | world
(1 row)
CREATE OR REPLACE FUNCTION perl_record_set() RETURNS SETOF record AS $$
return undef;
$$ LANGUAGE plperl;
SELECT perl_record_set();
perl_record_set
-----------------
(0 rows)
SELECT * FROM perl_record_set();
ERROR: a column definition list is required for functions returning "record"
SELECT * FROM perl_record_set() AS (f1 integer, f2 text, f3 text);
f1 | f2 | f3
----+----+----
(0 rows)
CREATE OR REPLACE FUNCTION perl_record_set() RETURNS SETOF record AS $$
return [
{ f1 => 1, f2 => 'Hello', f3 => 'World' },
undef,
{ f1 => 3, f2 => 'Hello', f3 => 'PL/Perl' }
];
$$ LANGUAGE plperl;
SELECT perl_record_set();
ERROR: function returning record called in context that cannot accept type record
SELECT * FROM perl_record_set();
ERROR: a column definition list is required for functions returning "record"
SELECT * FROM perl_record_set() AS (f1 integer, f2 text, f3 text);
ERROR: elements of Perl result array must be reference to hash
CREATE OR REPLACE FUNCTION perl_record_set() RETURNS SETOF record AS $$
return [
{ f1 => 1, f2 => 'Hello', f3 => 'World' },
{ f1 => 2, f2 => 'Hello', f3 => 'PostgreSQL' },
{ f1 => 3, f2 => 'Hello', f3 => 'PL/Perl' }
];
$$ LANGUAGE plperl;
SELECT perl_record_set();
ERROR: function returning record called in context that cannot accept type record
SELECT * FROM perl_record_set();
ERROR: a column definition list is required for functions returning "record"
SELECT * FROM perl_record_set() AS (f1 integer, f2 text, f3 text);
f1 | f2 | f3
----+-------+------------
1 | Hello | World
2 | Hello | PostgreSQL
3 | Hello | PL/Perl
(3 rows)
CREATE TYPE footype AS (x INTEGER, y INTEGER);
CREATE OR REPLACE FUNCTION foo_good() RETURNS SETOF footype AS $$
return [
{x => 1, y => 2},
{x => 3, y => 4}
];
$$ LANGUAGE plperl;
SELECT * FROM foo_good();
x | y
---+---
1 | 2
3 | 4
(2 rows)
CREATE OR REPLACE FUNCTION foo_bad() RETURNS footype AS $$
return {y => 3, z => 4};
$$ LANGUAGE plperl;
SELECT * FROM foo_bad();
ERROR: Perl hash contains nonexistent column "z"
CREATE OR REPLACE FUNCTION foo_bad() RETURNS footype AS $$
return 42;
$$ LANGUAGE plperl;
SELECT * FROM foo_bad();
ERROR: composite-returning Perl function must return reference to hash
CREATE OR REPLACE FUNCTION foo_bad() RETURNS footype AS $$
return [
[1, 2],
[3, 4]
];
$$ LANGUAGE plperl;
SELECT * FROM foo_bad();
ERROR: composite-returning Perl function must return reference to hash
CREATE OR REPLACE FUNCTION foo_set_bad() RETURNS SETOF footype AS $$
return 42;
$$ LANGUAGE plperl;
SELECT * FROM foo_set_bad();
ERROR: set-returning Perl function must return reference to array
CREATE OR REPLACE FUNCTION foo_set_bad() RETURNS SETOF footype AS $$
return {y => 3, z => 4};
$$ LANGUAGE plperl;
SELECT * FROM foo_set_bad();
ERROR: set-returning Perl function must return reference to array
CREATE OR REPLACE FUNCTION foo_set_bad() RETURNS SETOF footype AS $$
return [
[1, 2],
[3, 4]
];
$$ LANGUAGE plperl;
SELECT * FROM foo_set_bad();
ERROR: elements of Perl result array must be reference to hash
CREATE OR REPLACE FUNCTION foo_set_bad() RETURNS SETOF footype AS $$
return [
{y => 3, z => 4}
];
$$ LANGUAGE plperl;
SELECT * FROM foo_set_bad();
ERROR: Perl hash contains nonexistent column "z"
CREATE OR REPLACE FUNCTION perl_get_field(footype, text) RETURNS integer AS $$
return $_[0]->{$_[1]};
$$ LANGUAGE plperl;
SELECT perl_get_field((11,12), 'x');
perl_get_field
----------------
11
(1 row)
SELECT perl_get_field((11,12), 'y');
perl_get_field
----------------
12
(1 row)
SELECT perl_get_field((11,12), 'z');
perl_get_field
----------------
(1 row)
|