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