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ranges.py
# Copyright (C) 2013-2021 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: http://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 Table 9-44 of the `postgres 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. __ http://www.postgresql.org/docs/devel/static/functions-range.html No extra support is provided for the Range Functions listed in Table 9-45 of the postgres 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. """ 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 contigous. """ 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"
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