80 lines
1.6 KiB
Python
80 lines
1.6 KiB
Python
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"""
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Enum values for psycopg
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These values are defined by us and are not necessarily dependent on
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libpq-defined enums.
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"""
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# Copyright (C) 2020 The Psycopg Team
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from enum import Enum, IntEnum
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from selectors import EVENT_READ, EVENT_WRITE
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from . import pq
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class Wait(IntEnum):
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R = EVENT_READ
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W = EVENT_WRITE
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RW = EVENT_READ | EVENT_WRITE
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class Ready(IntEnum):
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R = EVENT_READ
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W = EVENT_WRITE
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RW = EVENT_READ | EVENT_WRITE
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class PyFormat(str, Enum):
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"""
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Enum representing the format wanted for a query argument.
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The value `AUTO` allows psycopg to choose the best format for a certain
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parameter.
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"""
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__module__ = "psycopg.adapt"
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AUTO = "s"
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"""Automatically chosen (``%s`` placeholder)."""
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TEXT = "t"
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"""Text parameter (``%t`` placeholder)."""
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BINARY = "b"
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"""Binary parameter (``%b`` placeholder)."""
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@classmethod
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def from_pq(cls, fmt: pq.Format) -> "PyFormat":
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return _pg2py[fmt]
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@classmethod
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def as_pq(cls, fmt: "PyFormat") -> pq.Format:
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return _py2pg[fmt]
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class IsolationLevel(IntEnum):
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"""
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Enum representing the isolation level for a transaction.
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"""
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__module__ = "psycopg"
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READ_UNCOMMITTED = 1
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""":sql:`READ UNCOMMITTED` isolation level."""
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READ_COMMITTED = 2
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""":sql:`READ COMMITTED` isolation level."""
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REPEATABLE_READ = 3
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""":sql:`REPEATABLE READ` isolation level."""
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SERIALIZABLE = 4
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""":sql:`SERIALIZABLE` isolation level."""
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_py2pg = {
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PyFormat.TEXT: pq.Format.TEXT,
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PyFormat.BINARY: pq.Format.BINARY,
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}
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_pg2py = {
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pq.Format.TEXT: PyFormat.TEXT,
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pq.Format.BINARY: PyFormat.BINARY,
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}
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