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편집 파일: json.py

# mysql/json.py
# Copyright (C) 2005-2019 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 __future__ import absolute_import

from ... import types as sqltypes

class JSON(sqltypes.JSON):
    """MySQL JSON type.

MySQL supports JSON as of version 5.7.  Note that MariaDB does **not**
    support JSON at the time of this writing.

The :class:`.mysql.JSON` type supports persistence of JSON values
    as well as the core index operations provided by :class:`.types.JSON`
    datatype, by adapting the operations to render the ``JSON_EXTRACT``
    function at the database level.

.. versionadded:: 1.1

"""

pass

class _FormatTypeMixin(object):
    def _format_value(self, value):
        raise NotImplementedError()

def bind_processor(self, dialect):
        super_proc = self.string_bind_processor(dialect)

def process(value):
            value = self._format_value(value)
            if super_proc:
                value = super_proc(value)
            return value

return process

def literal_processor(self, dialect):
        super_proc = self.string_literal_processor(dialect)

def process(value):
            value = self._format_value(value)
            if super_proc:
                value = super_proc(value)
            return value

return process

class JSONIndexType(_FormatTypeMixin, sqltypes.JSON.JSONIndexType):
    def _format_value(self, value):
        if isinstance(value, int):
            value = "$[%s]" % value
        else:
            value = '$."%s"' % value
        return value

class JSONPathType(_FormatTypeMixin, sqltypes.JSON.JSONPathType):
    def _format_value(self, value):
        return "$%s" % (
            "".join(
                [
                    "[%s]" % elem if isinstance(elem, int) else '."%s"' % elem
                    for elem in value
                ]
            )
        )