class TemporalSubtraction(CombinedExpression): (source)
Undocumented
Method | __init__ |
Undocumented |
Method | as |
Responsible for returning a (sql, [params]) tuple to be included in the current query. |
Class Variable | output |
Return the output type of this expressions. |
Inherited from CombinedExpression
:
Method | __repr__ |
Undocumented |
Method | __str__ |
Undocumented |
Method | get |
Undocumented |
Method | resolve |
Provide the chance to do any preprocessing or validation before being added to the query. |
Method | set |
Undocumented |
Instance Variable | connector |
Undocumented |
Instance Variable | lhs |
Undocumented |
Instance Variable | rhs |
Undocumented |
Method | _resolve |
Attempt to infer the output type of the expression. |
Inherited from SQLiteNumericMixin
(via CombinedExpression
):
Method | as |
Undocumented |
Inherited from Expression
(via CombinedExpression
, SQLiteNumericMixin
):
Method | __eq__ |
Undocumented |
Method | __hash__ |
Undocumented |
Property | identity |
Undocumented |
Inherited from BaseExpression
(via CombinedExpression
, SQLiteNumericMixin
, Expression
):
Method | __getstate__ |
Undocumented |
Method | asc |
Undocumented |
Method | copy |
Undocumented |
Method | desc |
Undocumented |
Method | flatten |
Recursively yield this expression and all subexpressions, in depth-first order. |
Method | get |
Undocumented |
Method | get |
Undocumented |
Method | get |
Undocumented |
Method | get |
Return the underlying field types used by this aggregate. |
Method | get |
Undocumented |
Method | prefix |
Undocumented |
Method | relabeled |
Undocumented |
Method | replace |
Undocumented |
Method | reverse |
Undocumented |
Method | select |
Custom format for select clauses. For example, EXISTS expressions need to be wrapped in CASE WHEN on Oracle. |
Class Variable | filterable |
Undocumented |
Class Variable | is |
Undocumented |
Class Variable | window |
Undocumented |
Property | conditional |
Undocumented |
Property | contains |
Undocumented |
Property | contains |
Undocumented |
Property | contains |
Undocumented |
Property | convert |
Expressions provide their own converters because users have the option of manually specifying the output_field which may be a different type from the one the database returns. |
Property | field |
Undocumented |
Static Method | _convert |
Undocumented |
Method | _parse |
Undocumented |
Class Variable | _output |
Undocumented |
Property | _output |
Return the output field of this expression, or None if _resolve_output_field() didn't return an output type. |
Inherited from Combinable
(via CombinedExpression
, SQLiteNumericMixin
, Expression
, BaseExpression
):
Method | __add__ |
Undocumented |
Method | __and__ |
Undocumented |
Method | __mod__ |
Undocumented |
Method | __mul__ |
Undocumented |
Method | __neg__ |
Undocumented |
Method | __or__ |
Undocumented |
Method | __pow__ |
Undocumented |
Method | __radd__ |
Undocumented |
Method | __rand__ |
Undocumented |
Method | __rmod__ |
Undocumented |
Method | __rmul__ |
Undocumented |
Method | __ror__ |
Undocumented |
Method | __rpow__ |
Undocumented |
Method | __rsub__ |
Undocumented |
Method | __rtruediv__ |
Undocumented |
Method | __rxor__ |
Undocumented |
Method | __sub__ |
Undocumented |
Method | __truediv__ |
Undocumented |
Method | __xor__ |
Undocumented |
Method | bitand |
Undocumented |
Method | bitleftshift |
Undocumented |
Method | bitor |
Undocumented |
Method | bitrightshift |
Undocumented |
Method | bitxor |
Undocumented |
Constant | ADD |
Undocumented |
Constant | BITAND |
Undocumented |
Constant | BITLEFTSHIFT |
Undocumented |
Constant | BITOR |
Undocumented |
Constant | BITRIGHTSHIFT |
Undocumented |
Constant | BITXOR |
Undocumented |
Constant | DIV |
Undocumented |
Constant | MOD |
Undocumented |
Constant | MUL |
Undocumented |
Constant | POW |
Undocumented |
Constant | SUB |
Undocumented |
Method | _combine |
Undocumented |
Responsible for returning a (sql, [params]) tuple to be included in the current query. Different backends can provide their own implementation, by providing an `as_{vendor}` method and patching the Expression: ``` def override_as_sql(self, compiler, connection): # custom logic return super().as_sql(compiler, connection) setattr(Expression, 'as_' + connection.vendor, override_as_sql) ``` Arguments: * compiler: the query compiler responsible for generating the query. Must have a compile method, returning a (sql, [params]) tuple. Calling compiler(value) will return a quoted `value`. * connection: the database connection used for the current query. Return: (sql, params) Where `sql` is a string containing ordered sql parameters to be replaced with the elements of the list `params`.