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Allow PL/python to return composite types and result sets 

Sven Suursoho
This commit is contained in:
Bruce Momjian 2006-09-02 12:30:01 +00:00
parent b1620c538d
commit 819f22a302
8 changed files with 1359 additions and 99 deletions
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304
doc/src/sgml/plpython.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpython.sgml,v 1.30 2006/05/26 19:23:09 adunstan Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpython.sgml,v 1.31 2006/09/02 12:30:01 momjian Exp $ -->
<chapter id="plpython">
<title>PL/Python - Python Procedural Language</title>
@ -46,28 +46,211 @@
<title>PL/Python Functions</title>
<para>
Functions in PL/Python are declared via the usual <xref
Functions in PL/Python are declared via the standard <xref
linkend="sql-createfunction" endterm="sql-createfunction-title">
syntax. For example:
syntax:
<programlisting>
CREATE FUNCTION myfunc(text) RETURNS text
AS 'return args[0]'
LANGUAGE plpythonu;
CREATE FUNCTION <replaceable>funcname</replaceable> (<replaceable>argument-list</replaceable>)
RETURNS <replaceable>return-type</replaceable>
AS $$
# PL/Python function body
$$ LANGUAGE plpythonu;
</programlisting>
</para>
<para>
The body of a function is simply a Python script. When the function
is called, all unnamed arguments are passed as elements to the array
<varname>args[]</varname> and named arguments as ordinary variables to the
Python script. The result is returned from the Python code in the usual way,
with <literal>return</literal> or <literal>yield</literal> (in case of
a resultset statement).
</para>
<para>
For example, a function to return the greater of two integers can be
defined as:
<programlisting>
CREATE FUNCTION pymax (a integer, b integer)
RETURNS integer
AS $$
if a &gt; b:
return a
return b
$$ LANGUAGE plpythonu;
</programlisting>
The Python code that is given as the body of the function definition
gets transformed into a Python function.
For example, the above results in
is transformed into a Python function. For example, the above results in
<programlisting>
def __plpython_procedure_myfunc_23456():
return args[0]
def __plpython_procedure_pymax_23456():
if a &gt; b:
return a
return b
</programlisting>
assuming that 23456 is the OID assigned to the function by
<productname>PostgreSQL</productname>.
</para>
<para>
The <productname>PostgreSQL</> function parameters are available in
the global <varname>args</varname> list. In the
<function>pymax</function> example, <varname>args[0]</varname> contains
whatever was passed in as the first argument and
<varname>args[1]</varname> contains the second argument's value. Alternatively,
one can use named parameters as shown in the example above. This greatly simplifies
the reading and writing of <application>PL/Python</application> code.
</para>
<para>
If an SQL null value<indexterm><primary>null value</primary><secondary
sortas="PL/Python">PL/Python</secondary></indexterm> is passed to a
function, the argument value will appear as <symbol>None</symbol> in
Python. The above function definition will return the wrong answer for null
inputs. We could add <literal>STRICT</literal> to the function definition
to make <productname>PostgreSQL</productname> do something more reasonable:
if a null value is passed, the function will not be called at all,
but will just return a null result automatically. Alternatively,
we could check for null inputs in the function body:
<programlisting>
CREATE FUNCTION pymax (a integer, b integer)
RETURNS integer
AS $$
if (a is None) or (b is None):
return None
if a > b:
return a
return b
$$ LANGUAGE plpythonu;
</programlisting>
As shown above, to return an SQL null value from a PL/Python
function, return the value <symbol>None</symbol>. This can be done whether the
function is strict or not.
</para>
<para>
Composite-type arguments are passed to the function as Python mappings. The
element names of the mapping are the attribute names of the composite type.
If an attribute in the passed row has the null value, it has the value
<symbol>None</symbol> in the mapping. Here is an example:
<programlisting>
CREATE TABLE employee (
name text,
salary integer,
age integer
);
CREATE FUNCTION overpaid (e employee)
RETURNS boolean
AS $$
if e["salary"] &gt; 200000:
return True
if (e["age"] &lt; 30) and (e["salary"] &gt; 100000):
return True
return False
$$ LANGUAGE plpythonu;
</programlisting>
</para>
<para>
There are multiple ways to return row or composite types from a Python
scripts. In following examples we assume to have:
<programlisting>
CREATE TABLE named_value (
name text,
value integer
);
</programlisting>
or
<programlisting>
CREATE TYPE named_value AS (
name text,
value integer
);
</programlisting>
<variablelist>
<varlistentry>
<term>Sequence types (tuple or list), but not <literal>set</literal> (because
it is not indexable)</term>
<listitem>
<para>
Returned sequence objects must have the same number of items as
composite types have fields. Item with index 0 is assigned to the first field
of the composite type, 1 to second and so on. For example:
<programlisting>
CREATE FUNCTION make_pair (name text, value integer)
RETURNS named_value
AS $$
return [ name, value ]
# or alternatively, as tuple: return ( name, value )
$$ LANGUAGE plpythonu;
</programlisting>
To return SQL null in any column, insert <symbol>None</symbol> at
the corresponding position.
</para>
</listitem>
<varlistentry>
<term>Mapping (dictionary)</term>
<listitem>
<para>
Value for a composite type's column is retrieved from the mapping with
the column name as key. Example:
<programlisting>
CREATE FUNCTION make_pair (name text, value integer)
RETURNS named_value
AS $$
return { "name": name, "value": value }
$$ LANGUAGE plpythonu;
</programlisting>
Additional dictionary key/value pairs are ignored. Missing keys are
treated as errors, i.e. to return an SQL null value for any column, insert
<symbol>None</symbol> with the corresponding column name as the key.
</para>
</listitem>
<varlistentry>
<term>Object (any object providing method <literal>__getattr__</literal>)</term>
<listitem>
<para>
Example:
<programlisting>
CREATE FUNCTION make_pair (name text, value integer)
RETURNS named_value
AS $$
class named_value:
def __init__ (self, n, v):
self.name = n
self.value = v
return named_value(name, value)
# or simply
class nv: pass
nv.name = name
nv.value = value
return nv
$$ LANGUAGE plpythonu;
</programlisting>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
If you do not provide a return value, Python returns the default
<symbol>None</symbol>. <application>PL/Python</application> translates
@ -77,13 +260,100 @@ def __plpython_procedure_myfunc_23456():
</para>
<para>
The <productname>PostgreSQL</> function parameters are available in
the global <varname>args</varname> list. In the
<function>myfunc</function> example, <varname>args[0]</> contains
whatever was passed in as the text argument. For
<literal>myfunc2(text, integer)</literal>, <varname>args[0]</>
would contain the <type>text</type> argument and
<varname>args[1]</varname> the <type>integer</type> argument.
A <application>PL/Python</application> function can also return sets of
scalar or composite types. There are serveral ways to achieve this because
the returned object is internally turned into an iterator. For following
examples, let's assume to have composite type:
<programlisting>
CREATE TYPE greeting AS (
how text,
who text
);
</programlisting>
Currently known iterable types are:
<variablelist>
<varlistentry>
<term>Sequence types (tuple, list, set)</term>
<listitem>
<para>
<programlisting>
CREATE FUNCTION greet (how text)
RETURNS SETOF greeting
AS $$
# return tuple containing lists as composite types
# all other combinations work also
return ( [ how, "World" ], [ how, "PostgreSQL" ], [ how, "PL/Python" ] )
$$ LANGUAGE plpythonu;
</programlisting>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Iterator (any object providing <symbol>__iter__</symbol> and
<symbol>next</symbol> methods)</term>
<listitem>
<para>
<programlisting>
CREATE FUNCTION greet (how text)
RETURNS SETOF greeting
AS $$
class producer:
def __init__ (self, how, who):
self.how = how
self.who = who
self.ndx = -1
def __iter__ (self):
return self
def next (self):
self.ndx += 1
if self.ndx == len(self.who):
raise StopIteration
return ( self.how, self.who[self.ndx] )
return producer(how, [ "World", "PostgreSQL", "PL/Python" ])
$$ LANGUAGE plpythonu;
</programlisting>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Generator (<literal>yield</literal>)</term>
<listitem>
<para>
<programlisting>
CREATE FUNCTION greet (how text)
RETURNS SETOF greeting
AS $$
for who in [ "World", "PostgreSQL", "PL/Python" ]:
yield ( how, who )
$$ LANGUAGE plpythonu;
</programlisting>
<warning>
<para>
Currently, due to Python
<ulink url="http://sourceforge.net/tracker/index.php?func=detail&amp;aid=1483133&amp;group_id=5470&amp;atid=105470">bug #1483133</ulink>,
some debug versions of Python 2.4
(configured and compiled with option <literal>--with-pydebug</literal>)
are known to crash the <productname>PostgreSQL</productname> server.
Unpatched versions of Fedora 4 contain this bug.
It does not happen in production version of Python or on patched
versions of Fedora 4.
</para>
</warning>
</para>
</listitem>
</varlistentry>
</variablelist>
Whenever new iterable types are added to Python language,
<application>PL/Python</application> is ready to use it.
</para>
<para>

144
src/pl/plpython/expected/plpython_function.out
View File

@ -55,27 +55,27 @@ except Exception, ex:
return "failed, that wasn''t supposed to happen"
return "succeeded, as expected"'
LANGUAGE plpythonu;
CREATE FUNCTION import_test_one(text) RETURNS text
CREATE FUNCTION import_test_one(p text) RETURNS text
AS
'import sha
digest = sha.new(args[0])
digest = sha.new(p)
return digest.hexdigest()'
LANGUAGE plpythonu;
CREATE FUNCTION import_test_two(users) RETURNS text
CREATE FUNCTION import_test_two(u users) RETURNS text
AS
'import sha
plain = args[0]["fname"] + args[0]["lname"]
plain = u["fname"] + u["lname"]
digest = sha.new(plain);
return "sha hash of " + plain + " is " + digest.hexdigest()'
LANGUAGE plpythonu;
CREATE FUNCTION argument_test_one(users, text, text) RETURNS text
CREATE FUNCTION argument_test_one(u users, a1 text, a2 text) RETURNS text
AS
'keys = args[0].keys()
'keys = u.keys()
keys.sort()
out = []
for key in keys:
out.append("%s: %s" % (key, args[0][key]))
words = args[1] + " " + args[2] + " => {" + ", ".join(out) + "}"
out.append("%s: %s" % (key, u[key]))
words = a1 + " " + a2 + " => {" + ", ".join(out) + "}"
return words'
LANGUAGE plpythonu;
-- these triggers are dedicated to HPHC of RI who
@ -174,40 +174,40 @@ DROP TRIGGER show_trigger_data_trig on trigger_test;
DROP FUNCTION trigger_data();
-- nested calls
--
CREATE FUNCTION nested_call_one(text) RETURNS text
CREATE FUNCTION nested_call_one(a text) RETURNS text
AS
'q = "SELECT nested_call_two(''%s'')" % args[0]
'q = "SELECT nested_call_two(''%s'')" % a
r = plpy.execute(q)
return r[0]'
LANGUAGE plpythonu ;
CREATE FUNCTION nested_call_two(text) RETURNS text
CREATE FUNCTION nested_call_two(a text) RETURNS text
AS
'q = "SELECT nested_call_three(''%s'')" % args[0]
'q = "SELECT nested_call_three(''%s'')" % a
r = plpy.execute(q)
return r[0]'
LANGUAGE plpythonu ;
CREATE FUNCTION nested_call_three(text) RETURNS text
CREATE FUNCTION nested_call_three(a text) RETURNS text
AS
'return args[0]'
'return a'
LANGUAGE plpythonu ;
-- some spi stuff
CREATE FUNCTION spi_prepared_plan_test_one(text) RETURNS text
CREATE FUNCTION spi_prepared_plan_test_one(a text) RETURNS text
AS
'if not SD.has_key("myplan"):
q = "SELECT count(*) FROM users WHERE lname = $1"
SD["myplan"] = plpy.prepare(q, [ "text" ])
try:
rv = plpy.execute(SD["myplan"], [args[0]])
return "there are " + str(rv[0]["count"]) + " " + str(args[0]) + "s"
rv = plpy.execute(SD["myplan"], [a])
return "there are " + str(rv[0]["count"]) + " " + str(a) + "s"
except Exception, ex:
plpy.error(str(ex))
return None
'
LANGUAGE plpythonu;
CREATE FUNCTION spi_prepared_plan_test_nested(text) RETURNS text
CREATE FUNCTION spi_prepared_plan_test_nested(a text) RETURNS text
AS
'if not SD.has_key("myplan"):
q = "SELECT spi_prepared_plan_test_one(''%s'') as count" % args[0]
q = "SELECT spi_prepared_plan_test_one(''%s'') as count" % a
SD["myplan"] = plpy.prepare(q)
try:
rv = plpy.execute(SD["myplan"])
@ -223,12 +223,12 @@ return None
CREATE FUNCTION stupid() RETURNS text AS 'return "zarkon"' LANGUAGE plpythonu;
/* a typo
*/
CREATE FUNCTION invalid_type_uncaught(text) RETURNS text
CREATE FUNCTION invalid_type_uncaught(a text) RETURNS text
AS
'if not SD.has_key("plan"):
q = "SELECT fname FROM users WHERE lname = $1"
SD["plan"] = plpy.prepare(q, [ "test" ])
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -237,7 +237,7 @@ return None
/* for what it's worth catch the exception generated by
* the typo, and return None
*/
CREATE FUNCTION invalid_type_caught(text) RETURNS text
CREATE FUNCTION invalid_type_caught(a text) RETURNS text
AS
'if not SD.has_key("plan"):
q = "SELECT fname FROM users WHERE lname = $1"
@ -246,7 +246,7 @@ CREATE FUNCTION invalid_type_caught(text) RETURNS text
except plpy.SPIError, ex:
plpy.notice(str(ex))
return None
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -255,7 +255,7 @@ return None
/* for what it's worth catch the exception generated by
* the typo, and reraise it as a plain error
*/
CREATE FUNCTION invalid_type_reraised(text) RETURNS text
CREATE FUNCTION invalid_type_reraised(a text) RETURNS text
AS
'if not SD.has_key("plan"):
q = "SELECT fname FROM users WHERE lname = $1"
@ -263,7 +263,7 @@ CREATE FUNCTION invalid_type_reraised(text) RETURNS text
SD["plan"] = plpy.prepare(q, [ "test" ])
except plpy.SPIError, ex:
plpy.error(str(ex))
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -271,11 +271,11 @@ return None
LANGUAGE plpythonu;
/* no typo no messing about
*/
CREATE FUNCTION valid_type(text) RETURNS text
CREATE FUNCTION valid_type(a text) RETURNS text
AS
'if not SD.has_key("plan"):
SD["plan"] = plpy.prepare("SELECT fname FROM users WHERE lname = $1", [ "text" ])
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -300,13 +300,13 @@ CREATE FUNCTION exception_index_invalid_nested() RETURNS text
'rv = plpy.execute("SELECT test5(''foo'')")
return rv[0]'
LANGUAGE plpythonu;
CREATE FUNCTION join_sequences(sequences) RETURNS text
CREATE FUNCTION join_sequences(s sequences) RETURNS text
AS
'if not args[0]["multipart"]:
return args[0]["sequence"]
q = "SELECT sequence FROM xsequences WHERE pid = ''%s''" % args[0]["pid"]
'if not s["multipart"]:
return s["sequence"]
q = "SELECT sequence FROM xsequences WHERE pid = ''%s''" % s["pid"]
rv = plpy.execute(q)
seq = args[0]["sequence"]
seq = s["sequence"]
for r in rv:
seq = seq + r["sequence"]
return seq
@ -357,3 +357,83 @@ $$ LANGUAGE plpythonu;
CREATE FUNCTION test_return_none() RETURNS int AS $$
None
$$ LANGUAGE plpythonu;
--
-- Test named parameters
--
CREATE FUNCTION test_param_names1(a0 integer, a1 text) RETURNS boolean AS $$
assert a0 == args[0]
assert a1 == args[1]
return True
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_param_names2(u users) RETURNS text AS $$
assert u == args[0]
return str(u)
$$ LANGUAGE plpythonu;
-- use deliberately wrong parameter names
CREATE FUNCTION test_param_names3(a0 integer) RETURNS boolean AS $$
try:
assert a1 == args[0]
return False
except NameError, e:
assert e.args[0].find("a1") > -1
return True
$$ LANGUAGE plpythonu;
--
-- Test returning SETOF
--
CREATE FUNCTION test_setof_as_list(count integer, content text) RETURNS SETOF text AS $$
return [ content ]*count
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_setof_as_tuple(count integer, content text) RETURNS SETOF text AS $$
t = ()
for i in xrange(count):
t += ( content, )
return t
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_setof_as_iterator(count integer, content text) RETURNS SETOF text AS $$
class producer:
def __init__ (self, icount, icontent):
self.icontent = icontent
self.icount = icount
def __iter__ (self):
return self
def next (self):
if self.icount == 0:
raise StopIteration
self.icount -= 1
return self.icontent
return producer(count, content)
$$ LANGUAGE plpythonu;
--
-- Test returning tuples
--
CREATE FUNCTION test_table_record_as(typ text, first text, second integer, retnull boolean) RETURNS table_record AS $$
if retnull:
return None
if typ == 'dict':
return { 'first': first, 'second': second, 'additionalfield': 'must not cause trouble' }
elif typ == 'tuple':
return ( first, second )
elif typ == 'list':
return [ first, second ]
elif typ == 'obj':
class type_record: pass
type_record.first = first
type_record.second = second
return type_record
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_type_record_as(typ text, first text, second integer, retnull boolean) RETURNS type_record AS $$
if retnull:
return None
if typ == 'dict':
return { 'first': first, 'second': second, 'additionalfield': 'must not cause trouble' }
elif typ == 'tuple':
return ( first, second )
elif typ == 'list':
return [ first, second ]
elif typ == 'obj':
class type_record: pass
type_record.first = first
type_record.second = second
return type_record
$$ LANGUAGE plpythonu;

8
src/pl/plpython/expected/plpython_schema.out
View File

@ -44,3 +44,11 @@ CREATE INDEX xsequences_pid_idx ON xsequences(pid) ;
CREATE TABLE unicode_test (
testvalue text NOT NULL
);
CREATE TABLE table_record (
first text,
second int4
) ;
CREATE TYPE type_record AS (
first text,
second int4
) ;

341
src/pl/plpython/expected/plpython_test.out
View File

@ -198,3 +198,344 @@ SELECT test_return_none(), test_return_none() IS NULL AS "is null";
| t
(1 row)
-- Test for functions with named parameters
SELECT test_param_names1(1,'text');
test_param_names1
-------------------
t
(1 row)
SELECT test_param_names2(users) from users;
test_param_names2
----------------------------------------------------------------------------
{'lname': 'doe', 'username': 'j_doe', 'userid': 1, 'fname': 'jane'}
{'lname': 'doe', 'username': 'johnd', 'userid': 2, 'fname': 'john'}
{'lname': 'doe', 'username': 'w_doe', 'userid': 3, 'fname': 'willem'}
{'lname': 'smith', 'username': 'slash', 'userid': 4, 'fname': 'rick'}
{'lname': 'smith', 'username': 'w_smith', 'userid': 5, 'fname': 'willem'}
{'lname': 'darwin', 'username': 'beagle', 'userid': 6, 'fname': 'charles'}
(6 rows)
SELECT test_param_names3(1);
test_param_names3
-------------------
t
(1 row)
-- Test set returning functions
SELECT test_setof_as_list(0, 'list');
test_setof_as_list
--------------------
(0 rows)
SELECT test_setof_as_list(1, 'list');
test_setof_as_list
--------------------
list
(1 row)
SELECT test_setof_as_list(2, 'list');
test_setof_as_list
--------------------
list
list
(2 rows)
SELECT test_setof_as_list(2, null);
test_setof_as_list
--------------------
(2 rows)
SELECT test_setof_as_tuple(0, 'tuple');
test_setof_as_tuple
---------------------
(0 rows)
SELECT test_setof_as_tuple(1, 'tuple');
test_setof_as_tuple
---------------------
tuple
(1 row)
SELECT test_setof_as_tuple(2, 'tuple');
test_setof_as_tuple
---------------------
tuple
tuple
(2 rows)
SELECT test_setof_as_tuple(2, null);
test_setof_as_tuple
---------------------
(2 rows)
SELECT test_setof_as_iterator(0, 'list');
test_setof_as_iterator
------------------------
(0 rows)
SELECT test_setof_as_iterator(1, 'list');
test_setof_as_iterator
------------------------
list
(1 row)
SELECT test_setof_as_iterator(2, 'list');
test_setof_as_iterator
------------------------
list
list
(2 rows)
SELECT test_setof_as_iterator(2, null);
test_setof_as_iterator
------------------------
(2 rows)
-- Test tuple returning functions
SELECT * FROM test_table_record_as('dict', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('dict', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_table_record_as('dict', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_table_record_as('dict', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_table_record_as('dict', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('tuple', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('tuple', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_table_record_as('tuple', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_table_record_as('tuple', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_table_record_as('tuple', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('list', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('list', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_table_record_as('list', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_table_record_as('list', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_table_record_as('list', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('obj', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_table_record_as('obj', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_table_record_as('obj', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_table_record_as('obj', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_table_record_as('obj', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('dict', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('dict', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_type_record_as('dict', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_type_record_as('dict', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_type_record_as('dict', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('tuple', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('tuple', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_type_record_as('tuple', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_type_record_as('tuple', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_type_record_as('tuple', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('list', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('list', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_type_record_as('list', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_type_record_as('list', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_type_record_as('list', null, null, true);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('obj', null, null, false);
first | second
-------+--------
|
(1 row)
SELECT * FROM test_type_record_as('obj', 'one', null, false);
first | second
-------+--------
one |
(1 row)
SELECT * FROM test_type_record_as('obj', null, 2, false);
first | second
-------+--------
| 2
(1 row)
SELECT * FROM test_type_record_as('obj', 'three', 3, false);
first | second
-------+--------
three | 3
(1 row)
SELECT * FROM test_type_record_as('obj', null, null, true);
first | second
-------+--------
|
(1 row)

425
src/pl/plpython/plpython.c
View File

@ -1,7 +1,7 @@
/**********************************************************************
* plpython.c - python as a procedural language for PostgreSQL
*
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.86 2006/08/27 23:47:58 tgl Exp $
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.87 2006/09/02 12:30:01 momjian Exp $
*
*********************************************************************
*/
@ -30,6 +30,7 @@
#include "catalog/pg_type.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "fmgr.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
@ -121,6 +122,9 @@ typedef struct PLyProcedure
bool fn_readonly;
PLyTypeInfo result; /* also used to store info for trigger tuple
* type */
bool is_setof; /* true, if procedure returns result set */
PyObject *setof; /* contents of result set. */
char **argnames; /* Argument names */
PLyTypeInfo args[FUNC_MAX_ARGS];
int nargs;
PyObject *code; /* compiled procedure code */
@ -196,6 +200,7 @@ static Datum PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure *);
static HeapTuple PLy_trigger_handler(FunctionCallInfo fcinfo, PLyProcedure *);
static PyObject *PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure *);
static void PLy_function_delete_args(PLyProcedure *);
static PyObject *PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *,
HeapTuple *);
static HeapTuple PLy_modify_tuple(PLyProcedure *, PyObject *,
@ -231,6 +236,9 @@ static PyObject *PLyInt_FromString(const char *);
static PyObject *PLyLong_FromString(const char *);
static PyObject *PLyString_FromString(const char *);
static HeapTuple PLyMapping_ToTuple(PLyTypeInfo *, PyObject *);
static HeapTuple PLySequence_ToTuple(PLyTypeInfo *, PyObject *);
static HeapTuple PLyObject_ToTuple(PLyTypeInfo *, PyObject *);
/*
* Currently active plpython function
@ -748,11 +756,17 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
PG_TRY();
{
plargs = PLy_function_build_args(fcinfo, proc);
plrv = PLy_procedure_call(proc, "args", plargs);
Assert(plrv != NULL);
Assert(!PLy_error_in_progress);
if (!proc->is_setof || proc->setof == NULL)
{
/* Simple type returning function or first time for SETOF function */
plargs = PLy_function_build_args(fcinfo, proc);
plrv = PLy_procedure_call(proc, "args", plargs);
if (!proc->is_setof)
/* SETOF function parameters will be deleted when last row is returned */
PLy_function_delete_args(proc);
Assert(plrv != NULL);
Assert(!PLy_error_in_progress);
}
/*
* Disconnect from SPI manager and then create the return values datum
@ -763,6 +777,67 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed");
if (proc->is_setof)
{
bool has_error = false;
ReturnSetInfo *rsi = (ReturnSetInfo *)fcinfo->resultinfo;
if (proc->setof == NULL)
{
/* first time -- do checks and setup */
if (!rsi || !IsA(rsi, ReturnSetInfo) ||
(rsi->allowedModes & SFRM_ValuePerCall) == 0)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("only value per call is allowed")));
}
rsi->returnMode = SFRM_ValuePerCall;
/* Make iterator out of returned object */
proc->setof = PyObject_GetIter(plrv);
Py_DECREF(plrv);
plrv = NULL;
if (proc->setof == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("returned object can not be iterated"),
errdetail("SETOF must be returned as iterable object")));
}
/* Fetch next from iterator */
plrv = PyIter_Next(proc->setof);
if (plrv)
rsi->isDone = ExprMultipleResult;
else
{
rsi->isDone = ExprEndResult;
has_error = PyErr_Occurred() != NULL;
}
if (rsi->isDone == ExprEndResult)
{
/* Iterator is exhausted or error happened */
Py_DECREF(proc->setof);
proc->setof = NULL;
Py_XDECREF(plargs);
Py_XDECREF(plrv);
Py_XDECREF(plrv_so);
PLy_function_delete_args(proc);
if (has_error)
ereport(ERROR,
(errcode(ERRCODE_DATA_EXCEPTION),
errmsg("error fetching next item from iterator")));
fcinfo->isnull = true;
return (Datum)NULL;
}
}
/*
* If the function is declared to return void, the Python
* return value must be None. For void-returning functions, we
@ -784,10 +859,39 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
else if (plrv == Py_None)
{
fcinfo->isnull = true;
rv = InputFunctionCall(&proc->result.out.d.typfunc,
NULL,
proc->result.out.d.typioparam,
-1);
if (proc->result.is_rowtype < 1)
rv = InputFunctionCall(&proc->result.out.d.typfunc,
NULL,
proc->result.out.d.typioparam,
-1);
else
/* Tuple as None */
rv = (Datum) NULL;
}
else if (proc->result.is_rowtype >= 1)
{
HeapTuple tuple = NULL;
if (PySequence_Check(plrv))
/* composite type as sequence (tuple, list etc) */
tuple = PLySequence_ToTuple(&proc->result, plrv);
else if (PyMapping_Check(plrv))
/* composite type as mapping (currently only dict) */
tuple = PLyMapping_ToTuple(&proc->result, plrv);
else
/* returned as smth, must provide method __getattr__(name) */
tuple = PLyObject_ToTuple(&proc->result, plrv);
if (tuple != NULL)
{
fcinfo->isnull = false;
rv = HeapTupleGetDatum(tuple);
}
else
{
fcinfo->isnull = true;
rv = (Datum) NULL;
}
}
else
{
@ -912,10 +1016,10 @@ PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure * proc)
arg = Py_None;
}
/*
* FIXME -- error check this
*/
PyList_SetItem(args, i, arg);
if (PyList_SetItem(args, i, arg) == -1 ||
(proc->argnames &&
PyDict_SetItemString(proc->globals, proc->argnames[i], arg) == -1))
PLy_elog(ERROR, "problem setting up arguments for \"%s\"", proc->proname);
arg = NULL;
}
}
@ -932,6 +1036,19 @@ PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure * proc)
}
static void
PLy_function_delete_args(PLyProcedure *proc)
{
int i;
if (!proc->argnames)
return;
for (i = 0; i < proc->nargs; i++)
PyDict_DelItemString(proc->globals, proc->argnames[i]);
}
/*
* PLyProcedure functions
*/
@ -1002,6 +1119,9 @@ PLy_procedure_create(FunctionCallInfo fcinfo, Oid tgreloid,
bool isnull;
int i,
rv;
Datum argnames;
Datum *elems;
int nelems;
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
@ -1033,6 +1153,9 @@ PLy_procedure_create(FunctionCallInfo fcinfo, Oid tgreloid,
proc->nargs = 0;
proc->code = proc->statics = NULL;
proc->globals = proc->me = NULL;
proc->is_setof = procStruct->proretset;
proc->setof = NULL;
proc->argnames = NULL;
PG_TRY();
{
@ -1069,9 +1192,11 @@ PLy_procedure_create(FunctionCallInfo fcinfo, Oid tgreloid,
}
if (rvTypeStruct->typtype == 'c')
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("plpython functions cannot return tuples yet")));
{
/* Tuple: set up later, during first call to PLy_function_handler */
proc->result.out.d.typoid = procStruct->prorettype;
proc->result.is_rowtype = 2;
}
else
PLy_output_datum_func(&proc->result, rvTypeTup);
@ -1094,6 +1219,20 @@ PLy_procedure_create(FunctionCallInfo fcinfo, Oid tgreloid,
* arguments.
*/
proc->nargs = fcinfo->nargs;
if (proc->nargs)
{
argnames = SysCacheGetAttr(PROCOID, procTup, Anum_pg_proc_proargnames, &isnull);
if (!isnull)
{
deconstruct_array(DatumGetArrayTypeP(argnames), TEXTOID, -1, false, 'i',
&elems, NULL, &nelems);
if (nelems != proc->nargs)
elog(ERROR,
"proargnames must have the same number of elements "
"as the function has arguments");
proc->argnames = (char **) PLy_malloc(sizeof(char *)*proc->nargs);
}
}
for (i = 0; i < fcinfo->nargs; i++)
{
HeapTuple argTypeTup;
@ -1122,8 +1261,11 @@ PLy_procedure_create(FunctionCallInfo fcinfo, Oid tgreloid,
proc->args[i].is_rowtype = 2; /* still need to set I/O funcs */
ReleaseSysCache(argTypeTup);
}
/* Fetch argument name */
if (proc->argnames)
proc->argnames[i] = PLy_strdup(DatumGetCString(DirectFunctionCall1(textout, elems[i])));
}
/*
* get the text of the function.
@ -1259,6 +1401,7 @@ PLy_procedure_delete(PLyProcedure * proc)
if (proc->pyname)
PLy_free(proc->pyname);
for (i = 0; i < proc->nargs; i++)
{
if (proc->args[i].is_rowtype == 1)
{
if (proc->args[i].in.r.atts)
@ -1266,6 +1409,11 @@ PLy_procedure_delete(PLyProcedure * proc)
if (proc->args[i].out.r.atts)
PLy_free(proc->args[i].out.r.atts);
}
if (proc->argnames && proc->argnames[i])
PLy_free(proc->argnames[i]);
}
if (proc->argnames)
PLy_free(proc->argnames);
}
/* conversion functions. remember output from python is
@ -1524,6 +1672,247 @@ PLyDict_FromTuple(PLyTypeInfo * info, HeapTuple tuple, TupleDesc desc)
return dict;
}
static HeapTuple
PLyMapping_ToTuple(PLyTypeInfo *info, PyObject *mapping)
{
TupleDesc desc;
HeapTuple tuple;
Datum *values;
char *nulls;
int i;
Assert(PyMapping_Check(mapping));
desc = lookup_rowtype_tupdesc(info->out.d.typoid, -1);
if (info->is_rowtype == 2)
PLy_output_tuple_funcs(info, desc);
Assert(info->is_rowtype == 1);
/* Build tuple */
values = palloc(sizeof(Datum)*desc->natts);
nulls = palloc(sizeof(char)*desc->natts);
for (i = 0; i < desc->natts; ++i)
{
char *key;
PyObject *value,
*so;
key = NameStr(desc->attrs[i]->attname);
value = so = NULL;
PG_TRY();
{
value = PyMapping_GetItemString(mapping, key);
if (value == Py_None)
{
values[i] = (Datum) NULL;
nulls[i] = 'n';
}
else if (value)
{
char *valuestr;
so = PyObject_Str(value);
if (so == NULL)
PLy_elog(ERROR, "can't convert mapping type");
valuestr = PyString_AsString(so);
values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
, valuestr
, info->out.r.atts[i].typioparam
, -1);
Py_DECREF(so);
so = NULL;
nulls[i] = ' ';
}
else
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("no mapping found with key \"%s\"", key),
errhint("to return null in specific column, "
"add value None to map with key named after column")));
Py_XDECREF(value);
value = NULL;
}
PG_CATCH();
{
Py_XDECREF(so);
Py_XDECREF(value);
PG_RE_THROW();
}
PG_END_TRY();
}
tuple = heap_formtuple(desc, values, nulls);
ReleaseTupleDesc(desc);
pfree(values);
pfree(nulls);
return tuple;
}
static HeapTuple
PLySequence_ToTuple(PLyTypeInfo *info, PyObject *sequence)
{
TupleDesc desc;
HeapTuple tuple;
Datum *values;
char *nulls;
int i;
Assert(PySequence_Check(sequence));
/*
* Check that sequence length is exactly same as PG tuple's. We actually
* can ignore exceeding items or assume missing ones as null but to
* avoid plpython developer's errors we are strict here
*/
desc = lookup_rowtype_tupdesc(info->out.d.typoid, -1);
if (PySequence_Length(sequence) != desc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("returned sequence's length must be same as tuple's length")));
if (info->is_rowtype == 2)
PLy_output_tuple_funcs(info, desc);
Assert(info->is_rowtype == 1);
/* Build tuple */
values = palloc(sizeof(Datum)*desc->natts);
nulls = palloc(sizeof(char)*desc->natts);
for (i = 0; i < desc->natts; ++i)
{
PyObject *value,
*so;
value = so = NULL;
PG_TRY();
{
value = PySequence_GetItem(sequence, i);
Assert(value);
if (value == Py_None)
{
values[i] = (Datum) NULL;
nulls[i] = 'n';
}
else if (value)
{
char *valuestr;
so = PyObject_Str(value);
if (so == NULL)
PLy_elog(ERROR, "can't convert sequence type");
valuestr = PyString_AsString(so);
values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
, valuestr
, info->out.r.atts[i].typioparam
, -1);
Py_DECREF(so);
so = NULL;
nulls[i] = ' ';
}
Py_XDECREF(value);
value = NULL;
}
PG_CATCH();
{
Py_XDECREF(so);
Py_XDECREF(value);
PG_RE_THROW();
}
PG_END_TRY();
}
tuple = heap_formtuple(desc, values, nulls);
ReleaseTupleDesc(desc);
pfree(values);
pfree(nulls);
return tuple;
}
static HeapTuple
PLyObject_ToTuple(PLyTypeInfo *info, PyObject *object)
{
TupleDesc desc;
HeapTuple tuple;
Datum *values;
char *nulls;
int i;
desc = lookup_rowtype_tupdesc(info->out.d.typoid, -1);
if (info->is_rowtype == 2)
PLy_output_tuple_funcs(info, desc);
Assert(info->is_rowtype == 1);
/* Build tuple */
values = palloc(sizeof(Datum)*desc->natts);
nulls = palloc(sizeof(char)*desc->natts);
for (i = 0; i < desc->natts; ++i)
{
char *key;
PyObject *value,
*so;
key = NameStr(desc->attrs[i]->attname);
value = so = NULL;
PG_TRY();
{
value = PyObject_GetAttrString(object, key);
if (value == Py_None)
{
values[i] = (Datum) NULL;
nulls[i] = 'n';
}
else if (value)
{
char *valuestr;
so = PyObject_Str(value);
if (so == NULL)
PLy_elog(ERROR, "can't convert object type");
valuestr = PyString_AsString(so);
values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
, valuestr
, info->out.r.atts[i].typioparam
, -1);
Py_DECREF(so);
so = NULL;
nulls[i] = ' ';
}
else
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("no attribute named \"%s\"", key),
errhint("to return null in specific column, "
"let returned object to have attribute named "
"after column with value None")));
Py_XDECREF(value);
value = NULL;
}
PG_CATCH();
{
Py_XDECREF(so);
Py_XDECREF(value);
PG_RE_THROW();
}
PG_END_TRY();
}
tuple = heap_formtuple(desc, values, nulls);
ReleaseTupleDesc(desc);
pfree(values);
pfree(nulls);
return tuple;
}
/* initialization, some python variables function declared here */
/* interface to postgresql elog */

156
src/pl/plpython/sql/plpython_function.sql
View File

@ -65,29 +65,29 @@ except Exception, ex:
return "succeeded, as expected"'
LANGUAGE plpythonu;
CREATE FUNCTION import_test_one(text) RETURNS text
CREATE FUNCTION import_test_one(p text) RETURNS text
AS
'import sha
digest = sha.new(args[0])
digest = sha.new(p)
return digest.hexdigest()'
LANGUAGE plpythonu;
CREATE FUNCTION import_test_two(users) RETURNS text
CREATE FUNCTION import_test_two(u users) RETURNS text
AS
'import sha
plain = args[0]["fname"] + args[0]["lname"]
plain = u["fname"] + u["lname"]
digest = sha.new(plain);
return "sha hash of " + plain + " is " + digest.hexdigest()'
LANGUAGE plpythonu;
CREATE FUNCTION argument_test_one(users, text, text) RETURNS text
CREATE FUNCTION argument_test_one(u users, a1 text, a2 text) RETURNS text
AS
'keys = args[0].keys()
'keys = u.keys()
keys.sort()
out = []
for key in keys:
out.append("%s: %s" % (key, args[0][key]))
words = args[1] + " " + args[2] + " => {" + ", ".join(out) + "}"
out.append("%s: %s" % (key, u[key]))
words = a1 + " " + a2 + " => {" + ", ".join(out) + "}"
return words'
LANGUAGE plpythonu;
@ -176,45 +176,45 @@ DROP FUNCTION trigger_data();
-- nested calls
--
CREATE FUNCTION nested_call_one(text) RETURNS text
CREATE FUNCTION nested_call_one(a text) RETURNS text
AS
'q = "SELECT nested_call_two(''%s'')" % args[0]
'q = "SELECT nested_call_two(''%s'')" % a
r = plpy.execute(q)
return r[0]'
LANGUAGE plpythonu ;
CREATE FUNCTION nested_call_two(text) RETURNS text
CREATE FUNCTION nested_call_two(a text) RETURNS text
AS
'q = "SELECT nested_call_three(''%s'')" % args[0]
'q = "SELECT nested_call_three(''%s'')" % a
r = plpy.execute(q)
return r[0]'
LANGUAGE plpythonu ;
CREATE FUNCTION nested_call_three(text) RETURNS text
CREATE FUNCTION nested_call_three(a text) RETURNS text
AS
'return args[0]'
'return a'
LANGUAGE plpythonu ;
-- some spi stuff
CREATE FUNCTION spi_prepared_plan_test_one(text) RETURNS text
CREATE FUNCTION spi_prepared_plan_test_one(a text) RETURNS text
AS
'if not SD.has_key("myplan"):
q = "SELECT count(*) FROM users WHERE lname = $1"
SD["myplan"] = plpy.prepare(q, [ "text" ])
try:
rv = plpy.execute(SD["myplan"], [args[0]])
return "there are " + str(rv[0]["count"]) + " " + str(args[0]) + "s"
rv = plpy.execute(SD["myplan"], [a])
return "there are " + str(rv[0]["count"]) + " " + str(a) + "s"
except Exception, ex:
plpy.error(str(ex))
return None
'
LANGUAGE plpythonu;
CREATE FUNCTION spi_prepared_plan_test_nested(text) RETURNS text
CREATE FUNCTION spi_prepared_plan_test_nested(a text) RETURNS text
AS
'if not SD.has_key("myplan"):
q = "SELECT spi_prepared_plan_test_one(''%s'') as count" % args[0]
q = "SELECT spi_prepared_plan_test_one(''%s'') as count" % a
SD["myplan"] = plpy.prepare(q)
try:
rv = plpy.execute(SD["myplan"])
@ -233,12 +233,12 @@ CREATE FUNCTION stupid() RETURNS text AS 'return "zarkon"' LANGUAGE plpythonu;
/* a typo
*/
CREATE FUNCTION invalid_type_uncaught(text) RETURNS text
CREATE FUNCTION invalid_type_uncaught(a text) RETURNS text
AS
'if not SD.has_key("plan"):
q = "SELECT fname FROM users WHERE lname = $1"
SD["plan"] = plpy.prepare(q, [ "test" ])
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -248,7 +248,7 @@ return None
/* for what it's worth catch the exception generated by
* the typo, and return None
*/
CREATE FUNCTION invalid_type_caught(text) RETURNS text
CREATE FUNCTION invalid_type_caught(a text) RETURNS text
AS
'if not SD.has_key("plan"):
q = "SELECT fname FROM users WHERE lname = $1"
@ -257,7 +257,7 @@ CREATE FUNCTION invalid_type_caught(text) RETURNS text
except plpy.SPIError, ex:
plpy.notice(str(ex))
return None
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -267,7 +267,7 @@ return None
/* for what it's worth catch the exception generated by
* the typo, and reraise it as a plain error
*/
CREATE FUNCTION invalid_type_reraised(text) RETURNS text
CREATE FUNCTION invalid_type_reraised(a text) RETURNS text
AS
'if not SD.has_key("plan"):
q = "SELECT fname FROM users WHERE lname = $1"
@ -275,7 +275,7 @@ CREATE FUNCTION invalid_type_reraised(text) RETURNS text
SD["plan"] = plpy.prepare(q, [ "test" ])
except plpy.SPIError, ex:
plpy.error(str(ex))
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -285,11 +285,11 @@ return None
/* no typo no messing about
*/
CREATE FUNCTION valid_type(text) RETURNS text
CREATE FUNCTION valid_type(a text) RETURNS text
AS
'if not SD.has_key("plan"):
SD["plan"] = plpy.prepare("SELECT fname FROM users WHERE lname = $1", [ "text" ])
rv = plpy.execute(SD["plan"], [ args[0] ])
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
return rv[0]["fname"]
return None
@ -318,13 +318,13 @@ return rv[0]'
LANGUAGE plpythonu;
CREATE FUNCTION join_sequences(sequences) RETURNS text
CREATE FUNCTION join_sequences(s sequences) RETURNS text
AS
'if not args[0]["multipart"]:
return args[0]["sequence"]
q = "SELECT sequence FROM xsequences WHERE pid = ''%s''" % args[0]["pid"]
'if not s["multipart"]:
return s["sequence"]
q = "SELECT sequence FROM xsequences WHERE pid = ''%s''" % s["pid"]
rv = plpy.execute(q)
seq = args[0]["sequence"]
seq = s["sequence"]
for r in rv:
seq = seq + r["sequence"]
return seq
@ -389,3 +389,95 @@ $$ LANGUAGE plpythonu;
CREATE FUNCTION test_return_none() RETURNS int AS $$
None
$$ LANGUAGE plpythonu;
--
-- Test named parameters
--
CREATE FUNCTION test_param_names1(a0 integer, a1 text) RETURNS boolean AS $$
assert a0 == args[0]
assert a1 == args[1]
return True
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_param_names2(u users) RETURNS text AS $$
assert u == args[0]
return str(u)
$$ LANGUAGE plpythonu;
-- use deliberately wrong parameter names
CREATE FUNCTION test_param_names3(a0 integer) RETURNS boolean AS $$
try:
assert a1 == args[0]
return False
except NameError, e:
assert e.args[0].find("a1") > -1
return True
$$ LANGUAGE plpythonu;
--
-- Test returning SETOF
--
CREATE FUNCTION test_setof_as_list(count integer, content text) RETURNS SETOF text AS $$
return [ content ]*count
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_setof_as_tuple(count integer, content text) RETURNS SETOF text AS $$
t = ()
for i in xrange(count):
t += ( content, )
return t
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_setof_as_iterator(count integer, content text) RETURNS SETOF text AS $$
class producer:
def __init__ (self, icount, icontent):
self.icontent = icontent
self.icount = icount
def __iter__ (self):
return self
def next (self):
if self.icount == 0:
raise StopIteration
self.icount -= 1
return self.icontent
return producer(count, content)
$$ LANGUAGE plpythonu;
--
-- Test returning tuples
--
CREATE FUNCTION test_table_record_as(typ text, first text, second integer, retnull boolean) RETURNS table_record AS $$
if retnull:
return None
if typ == 'dict':
return { 'first': first, 'second': second, 'additionalfield': 'must not cause trouble' }
elif typ == 'tuple':
return ( first, second )
elif typ == 'list':
return [ first, second ]
elif typ == 'obj':
class type_record: pass
type_record.first = first
type_record.second = second
return type_record
$$ LANGUAGE plpythonu;
CREATE FUNCTION test_type_record_as(typ text, first text, second integer, retnull boolean) RETURNS type_record AS $$
if retnull:
return None
if typ == 'dict':
return { 'first': first, 'second': second, 'additionalfield': 'must not cause trouble' }
elif typ == 'tuple':
return ( first, second )
elif typ == 'list':
return [ first, second ]
elif typ == 'obj':
class type_record: pass
type_record.first = first
type_record.second = second
return type_record
$$ LANGUAGE plpythonu;

10
src/pl/plpython/sql/plpython_schema.sql
View File

@ -42,3 +42,13 @@ CREATE INDEX xsequences_pid_idx ON xsequences(pid) ;
CREATE TABLE unicode_test (
testvalue text NOT NULL
);
CREATE TABLE table_record (
first text,
second int4
) ;
CREATE TYPE type_record AS (
first text,
second int4
) ;

70
src/pl/plpython/sql/plpython_test.sql
View File

@ -73,3 +73,73 @@ SELECT newline_crlf();
SELECT test_void_func1(), test_void_func1() IS NULL AS "is null";
SELECT test_void_func2(); -- should fail
SELECT test_return_none(), test_return_none() IS NULL AS "is null";
-- Test for functions with named parameters
SELECT test_param_names1(1,'text');
SELECT test_param_names2(users) from users;
SELECT test_param_names3(1);
-- Test set returning functions
SELECT test_setof_as_list(0, 'list');
SELECT test_setof_as_list(1, 'list');
SELECT test_setof_as_list(2, 'list');
SELECT test_setof_as_list(2, null);
SELECT test_setof_as_tuple(0, 'tuple');
SELECT test_setof_as_tuple(1, 'tuple');
SELECT test_setof_as_tuple(2, 'tuple');
SELECT test_setof_as_tuple(2, null);
SELECT test_setof_as_iterator(0, 'list');
SELECT test_setof_as_iterator(1, 'list');
SELECT test_setof_as_iterator(2, 'list');
SELECT test_setof_as_iterator(2, null);
-- Test tuple returning functions
SELECT * FROM test_table_record_as('dict', null, null, false);
SELECT * FROM test_table_record_as('dict', 'one', null, false);
SELECT * FROM test_table_record_as('dict', null, 2, false);
SELECT * FROM test_table_record_as('dict', 'three', 3, false);
SELECT * FROM test_table_record_as('dict', null, null, true);
SELECT * FROM test_table_record_as('tuple', null, null, false);
SELECT * FROM test_table_record_as('tuple', 'one', null, false);
SELECT * FROM test_table_record_as('tuple', null, 2, false);
SELECT * FROM test_table_record_as('tuple', 'three', 3, false);
SELECT * FROM test_table_record_as('tuple', null, null, true);
SELECT * FROM test_table_record_as('list', null, null, false);
SELECT * FROM test_table_record_as('list', 'one', null, false);
SELECT * FROM test_table_record_as('list', null, 2, false);
SELECT * FROM test_table_record_as('list', 'three', 3, false);
SELECT * FROM test_table_record_as('list', null, null, true);
SELECT * FROM test_table_record_as('obj', null, null, false);
SELECT * FROM test_table_record_as('obj', 'one', null, false);
SELECT * FROM test_table_record_as('obj', null, 2, false);
SELECT * FROM test_table_record_as('obj', 'three', 3, false);
SELECT * FROM test_table_record_as('obj', null, null, true);
SELECT * FROM test_type_record_as('dict', null, null, false);
SELECT * FROM test_type_record_as('dict', 'one', null, false);
SELECT * FROM test_type_record_as('dict', null, 2, false);
SELECT * FROM test_type_record_as('dict', 'three', 3, false);
SELECT * FROM test_type_record_as('dict', null, null, true);
SELECT * FROM test_type_record_as('tuple', null, null, false);
SELECT * FROM test_type_record_as('tuple', 'one', null, false);
SELECT * FROM test_type_record_as('tuple', null, 2, false);
SELECT * FROM test_type_record_as('tuple', 'three', 3, false);
SELECT * FROM test_type_record_as('tuple', null, null, true);
SELECT * FROM test_type_record_as('list', null, null, false);
SELECT * FROM test_type_record_as('list', 'one', null, false);
SELECT * FROM test_type_record_as('list', null, 2, false);
SELECT * FROM test_type_record_as('list', 'three', 3, false);
SELECT * FROM test_type_record_as('list', null, null, true);
SELECT * FROM test_type_record_as('obj', null, null, false);
SELECT * FROM test_type_record_as('obj', 'one', null, false);
SELECT * FROM test_type_record_as('obj', null, 2, false);
SELECT * FROM test_type_record_as('obj', 'three', 3, false);
SELECT * FROM test_type_record_as('obj', null, null, true);