plpython_function.sql

来自「postgresql8.3.4源码,开源数据库」· SQL 代码 · 共 483 行

CREATE FUNCTION global_test_one() returns text
    AS
'if not SD.has_key("global_test"):
	SD["global_test"] = "set by global_test_one"
if not GD.has_key("global_test"):
	GD["global_test"] = "set by global_test_one"
return "SD: " + SD["global_test"] + ", GD: " + GD["global_test"]'
    LANGUAGE plpythonu;

CREATE FUNCTION global_test_two() returns text
    AS
'if not SD.has_key("global_test"):
	SD["global_test"] = "set by global_test_two"
if not GD.has_key("global_test"):
	GD["global_test"] = "set by global_test_two"
return "SD: " + SD["global_test"] + ", GD: " + GD["global_test"]'
    LANGUAGE plpythonu;


CREATE FUNCTION static_test() returns int4
    AS
'if SD.has_key("call"):
	SD["call"] = SD["call"] + 1
else:
	SD["call"] = 1
return SD["call"]
'
    LANGUAGE plpythonu;

-- import python modules

CREATE FUNCTION import_fail() returns text
    AS
'try:
	import foosocket
except Exception, ex:
	plpy.notice("import socket failed -- %s" % str(ex))
	return "failed as expected"
return "succeeded, that wasn''t supposed to happen"'
    LANGUAGE plpythonu;


CREATE FUNCTION import_succeed() returns text
	AS
'try:
  import array
  import bisect
  import calendar
  import cmath
  import errno
  import math
  import md5
  import operator
  import random
  import re
  import sha
  import string
  import time
except Exception, ex:
	plpy.notice("import failed -- %s" % str(ex))
	return "failed, that wasn''t supposed to happen"
return "succeeded, as expected"'
    LANGUAGE plpythonu;

CREATE FUNCTION import_test_one(p text) RETURNS text
	AS
'import sha
digest = sha.new(p)
return digest.hexdigest()'
	LANGUAGE plpythonu;

CREATE FUNCTION import_test_two(u users) RETURNS text
	AS
'import sha
plain = u["fname"] + u["lname"]
digest = sha.new(plain);
return "sha hash of " + plain + " is " + digest.hexdigest()'
	LANGUAGE plpythonu;

CREATE FUNCTION argument_test_one(u users, a1 text, a2 text) RETURNS text
	AS
'keys = u.keys()
keys.sort()
out = []
for key in keys:
    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
-- decided that my kid's name was william not willem, and
-- vigorously resisted all efforts at correction.  they have
-- since gone bankrupt...

CREATE FUNCTION users_insert() returns trigger
	AS
'if TD["new"]["fname"] == None or TD["new"]["lname"] == None:
	return "SKIP"
if TD["new"]["username"] == None:
	TD["new"]["username"] = TD["new"]["fname"][:1] + "_" + TD["new"]["lname"]
	rv = "MODIFY"
else:
	rv = None
if TD["new"]["fname"] == "william":
	TD["new"]["fname"] = TD["args"][0]
	rv = "MODIFY"
return rv'
	LANGUAGE plpythonu;


CREATE FUNCTION users_update() returns trigger
	AS
'if TD["event"] == "UPDATE":
	if TD["old"]["fname"] != TD["new"]["fname"] and TD["old"]["fname"] == TD["args"][0]:
		return "SKIP"
return None'
	LANGUAGE plpythonu;


CREATE FUNCTION users_delete() RETURNS trigger
	AS
'if TD["old"]["fname"] == TD["args"][0]:
	return "SKIP"
return None'
	LANGUAGE plpythonu;


CREATE TRIGGER users_insert_trig BEFORE INSERT ON users FOR EACH ROW
	EXECUTE PROCEDURE users_insert ('willem');

CREATE TRIGGER users_update_trig BEFORE UPDATE ON users FOR EACH ROW
	EXECUTE PROCEDURE users_update ('willem');

CREATE TRIGGER users_delete_trig BEFORE DELETE ON users FOR EACH ROW
	EXECUTE PROCEDURE users_delete ('willem');



-- dump trigger data

CREATE TABLE trigger_test
	(i int, v text );

CREATE FUNCTION trigger_data() returns trigger language plpythonu as $$

if TD.has_key('relid'):
	TD['relid'] = "bogus:12345"

skeys = TD.keys()
skeys.sort()
for key in skeys:
	val = TD[key]
	plpy.notice("TD[" + key + "] => " + str(val))

return None  

$$;

CREATE TRIGGER show_trigger_data_trig 
BEFORE INSERT OR UPDATE OR DELETE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');

insert into trigger_test values(1,'insert');
update trigger_test set v = 'update' where i = 1;
delete from trigger_test;
      
DROP TRIGGER show_trigger_data_trig on trigger_test;
      
DROP FUNCTION trigger_data();

-- nested calls
--

CREATE FUNCTION nested_call_one(a text) RETURNS text
	AS
'q = "SELECT nested_call_two(''%s'')" % a
r = plpy.execute(q)
return r[0]'
	LANGUAGE plpythonu ;

CREATE FUNCTION nested_call_two(a text) RETURNS text
	AS
'q = "SELECT nested_call_three(''%s'')" % a
r = plpy.execute(q)
return r[0]'
	LANGUAGE plpythonu ;

CREATE FUNCTION nested_call_three(a text) RETURNS text
	AS
'return a'
	LANGUAGE plpythonu ;

-- some spi stuff

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"], [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(a text) RETURNS text
	AS
'if not SD.has_key("myplan"):
	q = "SELECT spi_prepared_plan_test_one(''%s'') as count" % a
	SD["myplan"] = plpy.prepare(q)
try:
	rv = plpy.execute(SD["myplan"])
	if len(rv):
		return rv[0]["count"]
except Exception, ex:
	plpy.error(str(ex))
return None
'
	LANGUAGE plpythonu;


/* really stupid function just to get the module loaded
*/
CREATE FUNCTION stupid() RETURNS text AS 'return "zarkon"' LANGUAGE plpythonu;

/* a typo
*/
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"], [ a ])
if len(rv):
	return rv[0]["fname"]
return None
'
	LANGUAGE plpythonu;

/* for what it's worth catch the exception generated by
 * the typo, and return None
 */
CREATE FUNCTION invalid_type_caught(a text) RETURNS text
	AS
'if not SD.has_key("plan"):
	q = "SELECT fname FROM users WHERE lname = $1"
	try:
		SD["plan"] = plpy.prepare(q, [ "test" ])
	except plpy.SPIError, ex:
		plpy.notice(str(ex))
		return None
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
	return rv[0]["fname"]
return None
'
	LANGUAGE plpythonu;

/* for what it's worth catch the exception generated by
 * the typo, and reraise it as a plain error
 */
CREATE FUNCTION invalid_type_reraised(a text) RETURNS text
	AS
'if not SD.has_key("plan"):
	q = "SELECT fname FROM users WHERE lname = $1"
	try:
		SD["plan"] = plpy.prepare(q, [ "test" ])
	except plpy.SPIError, ex:
		plpy.error(str(ex))
rv = plpy.execute(SD["plan"], [ a ])
if len(rv):
	return rv[0]["fname"]
return None
'
	LANGUAGE plpythonu;


/* no typo no messing about
*/
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"], [ a ])
if len(rv):
	return rv[0]["fname"]
return None
'
	LANGUAGE plpythonu;
/* Flat out syntax error
*/
CREATE FUNCTION sql_syntax_error() RETURNS text
        AS
'plpy.execute("syntax error")'
        LANGUAGE plpythonu;

/* check the handling of uncaught python exceptions
 */
CREATE FUNCTION exception_index_invalid(text) RETURNS text
	AS
'return args[1]'
	LANGUAGE plpythonu;

/* check handling of nested exceptions
 */
CREATE FUNCTION exception_index_invalid_nested() RETURNS text
	AS
'rv = plpy.execute("SELECT test5(''foo'')")
return rv[0]'
	LANGUAGE plpythonu;


CREATE FUNCTION join_sequences(s sequences) RETURNS text
	AS
'if not s["multipart"]:
	return s["sequence"]
q = "SELECT sequence FROM xsequences WHERE pid = ''%s''" % s["pid"]
rv = plpy.execute(q)
seq = s["sequence"]
for r in rv:
	seq = seq + r["sequence"]
return seq
'
	LANGUAGE plpythonu;

--
-- Universal Newline Support
-- 

CREATE OR REPLACE FUNCTION newline_lf() RETURNS integer AS
E'x = 100\ny = 23\nreturn x + y\n'
LANGUAGE plpythonu;

CREATE OR REPLACE FUNCTION newline_cr() RETURNS integer AS
E'x = 100\ry = 23\rreturn x + y\r'
LANGUAGE plpythonu;

CREATE OR REPLACE FUNCTION newline_crlf() RETURNS integer AS
E'x = 100\r\ny = 23\r\nreturn x + y\r\n'
LANGUAGE plpythonu;

--
-- Unicode error handling
--

CREATE FUNCTION unicode_return_error() RETURNS text AS E'
return u"\\x80"
' LANGUAGE plpythonu;

CREATE FUNCTION unicode_trigger_error() RETURNS trigger AS E'
TD["new"]["testvalue"] = u"\\x80"
return "MODIFY"
' LANGUAGE plpythonu;

CREATE TRIGGER unicode_test_bi BEFORE INSERT ON unicode_test
  FOR EACH ROW EXECUTE PROCEDURE unicode_trigger_error();

CREATE FUNCTION unicode_plan_error1() RETURNS text AS E'
plan = plpy.prepare("SELECT $1 AS testvalue", ["text"])
rv = plpy.execute(plan, [u"\\x80"], 1)
return rv[0]["testvalue"]
' LANGUAGE plpythonu;

CREATE FUNCTION unicode_plan_error2() RETURNS text AS E'
plan = plpy.prepare("SELECT $1 AS testvalue1, $2 AS testvalue2", ["text", "text"])
rv = plpy.execute(plan, u"\\x80", 1)
return rv[0]["testvalue1"]
' LANGUAGE plpythonu;

-- Tests for functions that return void

CREATE FUNCTION test_void_func1() RETURNS void AS $$
x = 10
$$ LANGUAGE plpythonu;

-- illegal: can't return non-None value in void-returning func
CREATE FUNCTION test_void_func2() RETURNS void AS $$
return 10
$$ 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;