You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
139 lines
4.7 KiB
Python
139 lines
4.7 KiB
Python
# Copyright (C) 2013-2022 the SQLAlchemy authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: https://www.opensource.org/licenses/mit-license.php
|
|
|
|
from ... import types as sqltypes
|
|
|
|
|
|
__all__ = ("INT4RANGE", "INT8RANGE", "NUMRANGE")
|
|
|
|
|
|
class RangeOperators(object):
|
|
"""
|
|
This mixin provides functionality for the Range Operators
|
|
listed in the Range Operators table of the `PostgreSQL documentation`__
|
|
for Range Functions and Operators. It is used by all the range types
|
|
provided in the ``postgres`` dialect and can likely be used for
|
|
any range types you create yourself.
|
|
|
|
__ https://www.postgresql.org/docs/current/static/functions-range.html
|
|
|
|
No extra support is provided for the Range Functions listed in the Range
|
|
Functions table of the PostgreSQL documentation. For these, the normal
|
|
:func:`~sqlalchemy.sql.expression.func` object should be used.
|
|
|
|
"""
|
|
|
|
class comparator_factory(sqltypes.Concatenable.Comparator):
|
|
"""Define comparison operations for range types."""
|
|
|
|
def __ne__(self, other):
|
|
"Boolean expression. Returns true if two ranges are not equal"
|
|
if other is None:
|
|
return super(RangeOperators.comparator_factory, self).__ne__(
|
|
other
|
|
)
|
|
else:
|
|
return self.expr.op("<>", is_comparison=True)(other)
|
|
|
|
def contains(self, other, **kw):
|
|
"""Boolean expression. Returns true if the right hand operand,
|
|
which can be an element or a range, is contained within the
|
|
column.
|
|
|
|
kwargs may be ignored by this operator but are required for API
|
|
conformance.
|
|
"""
|
|
return self.expr.op("@>", is_comparison=True)(other)
|
|
|
|
def contained_by(self, other):
|
|
"""Boolean expression. Returns true if the column is contained
|
|
within the right hand operand.
|
|
"""
|
|
return self.expr.op("<@", is_comparison=True)(other)
|
|
|
|
def overlaps(self, other):
|
|
"""Boolean expression. Returns true if the column overlaps
|
|
(has points in common with) the right hand operand.
|
|
"""
|
|
return self.expr.op("&&", is_comparison=True)(other)
|
|
|
|
def strictly_left_of(self, other):
|
|
"""Boolean expression. Returns true if the column is strictly
|
|
left of the right hand operand.
|
|
"""
|
|
return self.expr.op("<<", is_comparison=True)(other)
|
|
|
|
__lshift__ = strictly_left_of
|
|
|
|
def strictly_right_of(self, other):
|
|
"""Boolean expression. Returns true if the column is strictly
|
|
right of the right hand operand.
|
|
"""
|
|
return self.expr.op(">>", is_comparison=True)(other)
|
|
|
|
__rshift__ = strictly_right_of
|
|
|
|
def not_extend_right_of(self, other):
|
|
"""Boolean expression. Returns true if the range in the column
|
|
does not extend right of the range in the operand.
|
|
"""
|
|
return self.expr.op("&<", is_comparison=True)(other)
|
|
|
|
def not_extend_left_of(self, other):
|
|
"""Boolean expression. Returns true if the range in the column
|
|
does not extend left of the range in the operand.
|
|
"""
|
|
return self.expr.op("&>", is_comparison=True)(other)
|
|
|
|
def adjacent_to(self, other):
|
|
"""Boolean expression. Returns true if the range in the column
|
|
is adjacent to the range in the operand.
|
|
"""
|
|
return self.expr.op("-|-", is_comparison=True)(other)
|
|
|
|
def __add__(self, other):
|
|
"""Range expression. Returns the union of the two ranges.
|
|
Will raise an exception if the resulting range is not
|
|
contiguous.
|
|
"""
|
|
return self.expr.op("+")(other)
|
|
|
|
|
|
class INT4RANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the PostgreSQL INT4RANGE type."""
|
|
|
|
__visit_name__ = "INT4RANGE"
|
|
|
|
|
|
class INT8RANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the PostgreSQL INT8RANGE type."""
|
|
|
|
__visit_name__ = "INT8RANGE"
|
|
|
|
|
|
class NUMRANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the PostgreSQL NUMRANGE type."""
|
|
|
|
__visit_name__ = "NUMRANGE"
|
|
|
|
|
|
class DATERANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the PostgreSQL DATERANGE type."""
|
|
|
|
__visit_name__ = "DATERANGE"
|
|
|
|
|
|
class TSRANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the PostgreSQL TSRANGE type."""
|
|
|
|
__visit_name__ = "TSRANGE"
|
|
|
|
|
|
class TSTZRANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the PostgreSQL TSTZRANGE type."""
|
|
|
|
__visit_name__ = "TSTZRANGE"
|