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# This file is part of python-sql. The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
import unittest
from sql import AliasManager, Flavor, Table, Window
from sql.functions import (
Abs, AtTimeZone, CurrentTime, Div, Function, FunctionKeyword,
FunctionNotCallable, Overlay, Rank, Trim, WindowFunction)
class TestFunctions(unittest.TestCase):
table = Table('t')
def test_invalid_columns_definitions(self):
with self.assertRaises(ValueError):
Function(columns_definitions='foo')
def test_abs(self):
abs_ = Abs(self.table.c1)
self.assertEqual(str(abs_), 'ABS("c1")')
self.assertEqual(abs_.params, ())
abs_ = Abs(-12)
self.assertEqual(str(abs_), 'ABS(%s)')
self.assertEqual(abs_.params, (-12,))
def test_mapping(self):
class MyAbs(Function):
_function = 'MY_ABS'
params = ('test',)
class MyOverlay(FunctionKeyword):
_function = 'MY_OVERLAY'
_keywords = ('', 'PLACING', 'FROM', 'FOR')
class MyCurrentTime(FunctionNotCallable):
_function = 'MY_CURRENT_TIME'
class MyTrim(Trim):
_function = 'MY_TRIM'
abs_ = Abs(self.table.c1)
overlay = Overlay(self.table.c1, 'test', 2)
current_time = CurrentTime()
trim = Trim(' test ')
flavor = Flavor(function_mapping={
Abs: MyAbs,
Overlay: MyOverlay,
CurrentTime: MyCurrentTime,
Trim: MyTrim,
})
Flavor.set(flavor)
try:
self.assertEqual(str(abs_), 'MY_ABS("c1")')
self.assertEqual(abs_.params, ('test',))
self.assertEqual(str(overlay),
'MY_OVERLAY("c1" PLACING %s FROM %s)')
self.assertEqual(overlay.params, ('test', 2))
self.assertEqual(str(current_time), 'MY_CURRENT_TIME')
self.assertEqual(current_time.params, ())
self.assertEqual(str(trim), 'MY_TRIM(BOTH %s FROM %s)')
self.assertEqual(trim.params, (' ', ' test ',))
finally:
Flavor.set(Flavor())
def test_sql(self):
abs_ = Abs(self.table.select(self.table.c1,
where=self.table.c2 == 'foo'))
self.assertEqual(str(abs_),
'ABS((SELECT "a"."c1" FROM "t" AS "a" WHERE ("a"."c2" = %s)))')
self.assertEqual(abs_.params, ('foo',))
def test_overlay(self):
overlay = Overlay(self.table.c1, 'test', 3)
self.assertEqual(str(overlay), 'OVERLAY("c1" PLACING %s FROM %s)')
self.assertEqual(overlay.params, ('test', 3))
overlay = Overlay(self.table.c1, 'test', 3, 7)
self.assertEqual(str(overlay),
'OVERLAY("c1" PLACING %s FROM %s FOR %s)')
self.assertEqual(overlay.params, ('test', 3, 7))
def test_trim(self):
trim = Trim(' test ')
self.assertEqual(str(trim), 'TRIM(BOTH %s FROM %s)')
self.assertEqual(trim.params, (' ', ' test ',))
trim = Trim(self.table.c1)
self.assertEqual(str(trim), 'TRIM(BOTH %s FROM "c1")')
self.assertEqual(trim.params, (' ',))
def test_trim_invalid_position(self):
with self.assertRaises(ValueError):
Trim('test', 'foo')
def test_at_time_zone(self):
time_zone = AtTimeZone(self.table.c1, 'UTC')
self.assertEqual(str(time_zone), '"c1" AT TIME ZONE %s')
self.assertEqual(time_zone.params, ('UTC',))
def test_at_time_zone_expression(self):
time_zone = AtTimeZone(self.table.c1, self.table.zone)
self.assertEqual(str(time_zone), '"c1" AT TIME ZONE "zone"')
self.assertEqual(time_zone.params, ())
def test_at_time_zone_sql(self):
time_zone = AtTimeZone(self.table.c1,
self.table.select(self.table.tz, where=self.table.c1 == 'foo'))
self.assertEqual(str(time_zone),
'"c1" AT TIME ZONE '
'(SELECT "a"."tz" FROM "t" AS "a" WHERE ("a"."c1" = %s))')
self.assertEqual(time_zone.params, ('foo',))
def test_at_time_zone_mapping(self):
class MyAtTimeZone(Function):
_function = 'MY_TIMEZONE'
time_zone = AtTimeZone(self.table.c1, 'UTC')
flavor = Flavor(function_mapping={
AtTimeZone: MyAtTimeZone,
})
Flavor.set(flavor)
try:
self.assertEqual(str(time_zone), 'MY_TIMEZONE("c1", %s)')
self.assertEqual(time_zone.params, ('UTC',))
finally:
Flavor.set(Flavor())
def test_div(self):
for div in [Div(self.table.c1, self.table.c2),
self.table.c1 // self.table.c2]:
self.assertEqual(str(div), 'DIV("c1", "c2")')
self.assertEqual(div.params, ())
def test_current_time(self):
current_time = CurrentTime()
self.assertEqual(str(current_time), 'CURRENT_TIME')
self.assertEqual(current_time.params, ())
class TestWindowFunction(unittest.TestCase):
def test_window(self):
t = Table('t')
function = Rank(t.c, window=Window([]))
with AliasManager():
self.assertEqual(str(function), 'RANK("a"."c") OVER ()')
self.assertEqual(function.params, ())
def test_invalid_window(self):
with self.assertRaises(ValueError):
WindowFunction(window='foo')
def test_filter(self):
t = Table('t')
function = Rank(t.c, filter_=t.c > 0, window=Window([]))
with AliasManager():
self.assertEqual(str(function),
'RANK("a"."c") FILTER (WHERE ("a"."c" > %s)) OVER ()')
self.assertEqual(function.params, (0,))
def test_invalid_filter(self):
with self.assertRaises(ValueError):
WindowFunction(filter_='foo', window=Window([]))
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