sqlalchemy.dialects.sqlite.base._SQliteJson

class documentation

class _SQliteJson(JSON): (source)

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Undocumented

Method result_processor Return a conversion function for processing result row values.

Inherited from JSON (via JSON):

Class Comparator Define comparison operations for :class:`_types.JSON`.
Class JSONElementType Common function for index / path elements in a JSON expression.
Class JSONIndexType Placeholder for the datatype of a JSON index value.
Class JSONIntIndexType Placeholder for the datatype of a JSON index value.
Class JSONPathType Placeholder type for JSON path operations.
Class JSONStrIndexType Placeholder for the datatype of a JSON index value.
Method __init__ Construct a :class:`_types.JSON` type.
Method bind_processor Return a conversion function for processing bind values.
Method should_evaluate_none.setter Undocumented
Constant NULL Describe the json value of NULL.
Class Variable __visit_name__ Undocumented
Class Variable hashable Flag, if False, means values from this type aren't hashable.
Instance Variable none_as_null Undocumented
Property python_type Return the Python type object expected to be returned by instances of this type, if known.
Property should_evaluate_none Alias of :attr:`_types.JSON.none_as_null`
Method _make_bind_processor Undocumented
Property _str_impl Undocumented

Inherited from TypeEngineMixin (via JSON, JSON, Indexable):

Method adapt Undocumented
Method dialect_impl Undocumented
Class Variable __slots__ Undocumented
Property _static_cache_key Undocumented

Inherited from TypeEngine (via JSON, JSON, Indexable, TypeEngineMixin):

Method __repr__ Undocumented
Method __str__ Undocumented
Method as_generic Return an instance of the generic type corresponding to this type using heuristic rule. The method may be overridden if this heuristic rule is not sufficient.
Method bind_expression Given a bind value (i.e. a :class:`.BindParameter` instance), return a SQL expression in its place.
Method coerce_compared_value Suggest a type for a 'coerced' Python value in an expression.
Method column_expression Given a SELECT column expression, return a wrapping SQL expression.
Method compare_against_backend Compare this type against the given backend type.
Method compare_values Compare two values for equality.
Method compile Produce a string-compiled form of this :class:`.TypeEngine`.
Method copy Undocumented
Method copy_value Undocumented
Method evaluates_none Return a copy of this type which has the :attr:`.should_evaluate_none` flag set to True.
Method get_dbapi_type Return the corresponding type object from the underlying DB-API, if any.
Method literal_processor Return a conversion function for processing literal values that are to be rendered directly without using binds.
Method with_variant Produce a copy of this type object that will utilize the given type when applied to the dialect of the given name.
Class Variable render_bind_cast Render bind casts for :attr:`.BindTyping.RENDER_CASTS` mode.
Class Variable render_literal_cast render casts when rendering a value as an inline literal, e.g. with :meth:`.TypeEngine.literal_processor`.
Class Variable sort_key_function A sorting function that can be passed as the key to sorted.
Static Method _to_instance Undocumented
Method _cached_bind_processor Return a dialect-specific bind processor for this type.
Method _cached_custom_processor return a dialect-specific processing object for custom purposes.
Method _cached_literal_processor Return a dialect-specific literal processor for this type.
Method _cached_result_processor Return a dialect-specific result processor for this type.
Method _compare_type_affinity Undocumented
Method _default_dialect Undocumented
Method _dialect_info Return a dialect-specific registry which caches a dialect-specific implementation, bind processing function, and one or more result processing functions.
Method _gen_dialect_impl Undocumented
Method _resolve_for_literal adjust this type given a literal Python value that will be stored in a bound parameter.
Method _resolve_for_python_type given a Python type (e.g. ``int``, ``str``, etc. ) return an instance of this :class:`.TypeEngine` that's appropriate for this type.
Method _unwrapped_dialect_impl Return the 'unwrapped' dialect impl for this type.
Class Variable _is_array Undocumented
Class Variable _is_table_value Undocumented
Class Variable _is_tuple_type Undocumented
Class Variable _is_type_decorator Undocumented
Class Variable _isnull Undocumented
Class Variable _sqla_type Undocumented
Property _generic_type_affinity Undocumented
Property _has_bind_expression memoized boolean, check if bind_expression is implemented.
Property _has_column_expression memoized boolean, check if column_expression is implemented.
Property _type_affinity Return a rudimental 'affinity' value expressing the general class of type.

Inherited from Visitable (via JSON, JSON, Indexable, TypeEngineMixin, TypeEngine):

Method __class_getitem__ Undocumented
Method __init_subclass__ Undocumented
Class Method _generate_compiler_dispatch Undocumented
Method _compiler_dispatch Undocumented
Class Variable _original_compiler_dispatch Undocumented
def result_processor(self, dialect, coltype): (source)
overrides sqlalchemy.sql.sqltypes.JSON.result_processor

Return a conversion function for processing result row values. Returns a callable which will receive a result row column value as the sole positional argument and will return a value to return to the user. If processing is not necessary, the method should return ``None``. .. note:: This method is only called relative to a **dialect specific type object**, which is often **private to a dialect in use** and is not the same type object as the public facing one, which means it's not feasible to subclass a :class:`.types.TypeEngine` class in order to provide an alternate :meth:`_types.TypeEngine.result_processor` method, unless subclassing the :class:`_types.UserDefinedType` class explicitly. To provide alternate behavior for :meth:`_types.TypeEngine.result_processor`, implement a :class:`_types.TypeDecorator` class and provide an implementation of :meth:`_types.TypeDecorator.process_result_value`. .. seealso:: :ref:`types_typedecorator` :param dialect: Dialect instance in use. :param coltype: DBAPI coltype argument received in cursor.description.