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85 lines
2.5 KiB
85 lines
2.5 KiB
3 years ago
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from ... import types as sqltypes
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class JSON(sqltypes.JSON):
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"""SQLite JSON type.
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SQLite supports JSON as of version 3.9 through its JSON1_ extension. Note
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that JSON1_ is a
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`loadable extension <https://www.sqlite.org/loadext.html>`_ and as such
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may not be available, or may require run-time loading.
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:class:`_sqlite.JSON` is used automatically whenever the base
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:class:`_types.JSON` datatype is used against a SQLite 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:`_sqlite.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 wrapped in the ``JSON_QUOTE`` function at the database level.
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Extracted values are quoted in order to ensure that the results are
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always JSON string values.
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.. versionadded:: 1.3
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.. _JSON1: https://www.sqlite.org/json1.html
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"""
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# Note: these objects currently match exactly those of MySQL, however since
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# these are not generalizable to all JSON implementations, remain separately
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# implemented for each dialect.
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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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