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183 | import math
from django.db.models.expressions import Func
from django.db.models.fields import FloatField, IntegerField
from django.db.models.functions import Cast
from django.db.models.functions.mixins import (
FixDecimalInputMixin, NumericOutputFieldMixin,
)
from django.db.models.lookups import Transform
class Abs(Transform):
function = 'ABS'
lookup_name = 'abs'
class ACos(NumericOutputFieldMixin, Transform):
function = 'ACOS'
lookup_name = 'acos'
class ASin(NumericOutputFieldMixin, Transform):
function = 'ASIN'
lookup_name = 'asin'
class ATan(NumericOutputFieldMixin, Transform):
function = 'ATAN'
lookup_name = 'atan'
class ATan2(NumericOutputFieldMixin, Func):
function = 'ATAN2'
arity = 2
def as_sqlite(self, compiler, connection, **extra_context):
if not getattr(connection.ops, 'spatialite', False) or connection.ops.spatial_version >= (5, 0, 0):
return self.as_sql(compiler, connection)
# This function is usually ATan2(y, x), returning the inverse tangent
# of y / x, but it's ATan2(x, y) on SpatiaLite < 5.0.0.
# Cast integers to float to avoid inconsistent/buggy behavior if the
# arguments are mixed between integer and float or decimal.
# https://www.gaia-gis.it/fossil/libspatialite/tktview?name=0f72cca3a2
clone = self.copy()
clone.set_source_expressions([
Cast(expression, FloatField()) if isinstance(expression.output_field, IntegerField)
else expression for expression in self.get_source_expressions()[::-1]
])
return clone.as_sql(compiler, connection, **extra_context)
class Ceil(Transform):
function = 'CEILING'
lookup_name = 'ceil'
def as_oracle(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function='CEIL', **extra_context)
class Cos(NumericOutputFieldMixin, Transform):
function = 'COS'
lookup_name = 'cos'
class Cot(NumericOutputFieldMixin, Transform):
function = 'COT'
lookup_name = 'cot'
def as_oracle(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, template='(1 / TAN(%(expressions)s))', **extra_context)
class Degrees(NumericOutputFieldMixin, Transform):
function = 'DEGREES'
lookup_name = 'degrees'
def as_oracle(self, compiler, connection, **extra_context):
return super().as_sql(
compiler, connection,
template='((%%(expressions)s) * 180 / %s)' % math.pi,
**extra_context
)
class Exp(NumericOutputFieldMixin, Transform):
function = 'EXP'
lookup_name = 'exp'
class Floor(Transform):
function = 'FLOOR'
lookup_name = 'floor'
class Ln(NumericOutputFieldMixin, Transform):
function = 'LN'
lookup_name = 'ln'
class Log(FixDecimalInputMixin, NumericOutputFieldMixin, Func):
function = 'LOG'
arity = 2
def as_sqlite(self, compiler, connection, **extra_context):
if not getattr(connection.ops, 'spatialite', False):
return self.as_sql(compiler, connection)
# This function is usually Log(b, x) returning the logarithm of x to
# the base b, but on SpatiaLite it's Log(x, b).
clone = self.copy()
clone.set_source_expressions(self.get_source_expressions()[::-1])
return clone.as_sql(compiler, connection, **extra_context)
class Mod(FixDecimalInputMixin, NumericOutputFieldMixin, Func):
function = 'MOD'
arity = 2
class Pi(NumericOutputFieldMixin, Func):
function = 'PI'
arity = 0
def as_oracle(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, template=str(math.pi), **extra_context)
class Power(NumericOutputFieldMixin, Func):
function = 'POWER'
arity = 2
class Radians(NumericOutputFieldMixin, Transform):
function = 'RADIANS'
lookup_name = 'radians'
def as_oracle(self, compiler, connection, **extra_context):
return super().as_sql(
compiler, connection,
template='((%%(expressions)s) * %s / 180)' % math.pi,
**extra_context
)
class Random(NumericOutputFieldMixin, Func):
function = 'RANDOM'
arity = 0
def as_mysql(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function='RAND', **extra_context)
def as_oracle(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function='DBMS_RANDOM.VALUE', **extra_context)
def as_sqlite(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function='RAND', **extra_context)
def get_group_by_cols(self, alias=None):
return []
class Round(Transform):
function = 'ROUND'
lookup_name = 'round'
class Sign(Transform):
function = 'SIGN'
lookup_name = 'sign'
class Sin(NumericOutputFieldMixin, Transform):
function = 'SIN'
lookup_name = 'sin'
class Sqrt(NumericOutputFieldMixin, Transform):
function = 'SQRT'
lookup_name = 'sqrt'
class Tan(NumericOutputFieldMixin, Transform):
function = 'TAN'
lookup_name = 'tan'
|