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85 lines
2.3 KiB
85 lines
2.3 KiB
3 years ago
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# mysql/json.py
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# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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from __future__ import absolute_import
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from ... import types as sqltypes
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class JSON(sqltypes.JSON):
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"""MySQL JSON type.
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MySQL supports JSON as of version 5.7.
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MariaDB supports JSON (as an alias for LONGTEXT) as of version 10.2.
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:class:`_mysql.JSON` is used automatically whenever the base
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:class:`_types.JSON` datatype is used against a MySQL or MariaDB backend.
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.. seealso::
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:class:`_types.JSON` - main documentation for the generic
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cross-platform JSON datatype.
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The :class:`.mysql.JSON` type supports persistence of JSON values
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as well as the core index operations provided by :class:`_types.JSON`
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datatype, by adapting the operations to render the ``JSON_EXTRACT``
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function at the database level.
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.. versionadded:: 1.1
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"""
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pass
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class _FormatTypeMixin(object):
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def _format_value(self, value):
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raise NotImplementedError()
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def bind_processor(self, dialect):
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super_proc = self.string_bind_processor(dialect)
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def process(value):
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value = self._format_value(value)
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if super_proc:
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value = super_proc(value)
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return value
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return process
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def literal_processor(self, dialect):
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super_proc = self.string_literal_processor(dialect)
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def process(value):
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value = self._format_value(value)
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if super_proc:
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value = super_proc(value)
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return value
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return process
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class JSONIndexType(_FormatTypeMixin, sqltypes.JSON.JSONIndexType):
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def _format_value(self, value):
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if isinstance(value, int):
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value = "$[%s]" % value
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else:
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value = '$."%s"' % value
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return value
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class JSONPathType(_FormatTypeMixin, sqltypes.JSON.JSONPathType):
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def _format_value(self, value):
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return "$%s" % (
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"".join(
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[
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"[%s]" % elem if isinstance(elem, int) else '."%s"' % elem
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for elem in value
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]
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)
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)
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