Source code for django.db.models.functions.math

import math

from django.db.models.expressions import Func, Value
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


[docs]class Abs(Transform): function = "ABS" lookup_name = "abs"
[docs]class ACos(NumericOutputFieldMixin, Transform): function = "ACOS" lookup_name = "acos"
[docs]class ASin(NumericOutputFieldMixin, Transform): function = "ASIN" lookup_name = "asin"
[docs]class ATan(NumericOutputFieldMixin, Transform): function = "ATAN" lookup_name = "atan"
[docs]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)
[docs]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)
[docs]class Cos(NumericOutputFieldMixin, Transform): function = "COS" lookup_name = "cos"
[docs]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 )
[docs]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, )
[docs]class Exp(NumericOutputFieldMixin, Transform): function = "EXP" lookup_name = "exp"
[docs]class Floor(Transform): function = "FLOOR" lookup_name = "floor"
[docs]class Ln(NumericOutputFieldMixin, Transform): function = "LN" lookup_name = "ln"
[docs]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)
[docs]class Mod(FixDecimalInputMixin, NumericOutputFieldMixin, Func): function = "MOD" arity = 2
[docs]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 )
[docs]class Power(NumericOutputFieldMixin, Func): function = "POWER" arity = 2
[docs]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, )
[docs]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): return []
[docs]class Round(FixDecimalInputMixin, Transform): function = "ROUND" lookup_name = "round" arity = None # Override Transform's arity=1 to enable passing precision. def __init__(self, expression, precision=0, **extra): super().__init__(expression, precision, **extra) def as_sqlite(self, compiler, connection, **extra_context): precision = self.get_source_expressions()[1] if isinstance(precision, Value) and precision.value < 0: raise ValueError("SQLite does not support negative precision.") return super().as_sqlite(compiler, connection, **extra_context) def _resolve_output_field(self): source = self.get_source_expressions()[0] return source.output_field
[docs]class Sign(Transform): function = "SIGN" lookup_name = "sign"
[docs]class Sin(NumericOutputFieldMixin, Transform): function = "SIN" lookup_name = "sin"
[docs]class Sqrt(NumericOutputFieldMixin, Transform): function = "SQRT" lookup_name = "sqrt"
[docs]class Tan(NumericOutputFieldMixin, Transform): function = "TAN" lookup_name = "tan"
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