budosystems.storage.query¶

Query builder classes.

Module Attributes

`ExpressionResult_co`	Type variable for the final result of an evaluated `Expression` (covariant type).
`ExpressionResult`	Type variable for the final result of an evaluated `Expression` (invariant type).
`Predicate`	A combination of primitives and operators that evaluate to a boolean.
`OperandType_contra`	Type variable for the operands of an `Operator`.
`OperationResult_co`	Type variable for the result of an `Operator`.
`AND`	AND query operator.
`OR`	OR query operator.
`XOR`	XOR (Exclusive Or) query operator.
`LE`	LE (Less Than Or Equal) query operator.
`LT`	LT (Less Than) query operator.
`GE`	GE (Greater Than Or Equal) query operator.
`GT`	GT (Greater Than) query operator.
`EQ`	EQ (Equals) query operator.
`NE`	NE (Not Equals) query operator.
`TRUE`	TRUE query literal.
`FALSE`	FALSE query literal.
`NONE`	NONE query literal.

Classes

`BooleanOperationExpression`	Bridge class
`BooleanOperator`	Once evaluated, instances of this operator will return the truth value of all it's boolean operands combined by the same operator.
`ClosedOperationExpression`	Evaluable operator_func expression which give results of the same type as it's operands
`Comparable`	Any object that supports comparison operators.
`ComparableExpression`	Type of expression that results in a concrete type that supports comparisons.
`ComparisonOperationExpression`	Evaluable comparison operator_func.
`ComparisonOperator`	Once evaluated, instances of this operator will return the truth value of all it's operands when compared to one another in the order they were given by the same comparator.
`EntityType`	An entity in the query language.
`Expression`	A combination of primitives and operators that evaluate to a concrete type.
`Field`	A field in the query language.
`LiteralExpression`	A simple concrete value expression representing a literal.
`OpSignature`	Callback protocol for the signature of the function tha will evaluate the `Operator`.
`OperationExpression`	Evaluable operator_func expression.
`Operator`	An operator_func that combines components to evaluate to some value during the query.
`Query`	Root class of a query.
`VariableExpression`	A generic variable in the query language.

class ExpressionResult_co¶

Type variable for the final result of an evaluated Expression (covariant type).

alias of TypeVar(‘ExpressionResult_co’, covariant=True)

class ExpressionResult¶

Type variable for the final result of an evaluated Expression (invariant type).

alias of TypeVar(‘ExpressionResult’)

Predicate¶

A combination of primitives and operators that evaluate to a boolean.

class OperandType_contra¶

Type variable for the operands of an Operator.

alias of TypeVar(‘OperandType_contra’, contravariant=True)

class OperationResult_co¶

Type variable for the result of an Operator.

alias of TypeVar(‘OperationResult_co’, covariant=True)

AND = <budosystems.storage.query.BooleanOperator object>¶: AND query operator.

OR = <budosystems.storage.query.BooleanOperator object>¶: OR query operator.

XOR = <budosystems.storage.query.BooleanOperator object>¶: XOR (Exclusive Or) query operator.

LE = <budosystems.storage.query.ComparisonOperator object>¶: LE (Less Than Or Equal) query operator.

LT = <budosystems.storage.query.ComparisonOperator object>¶: LT (Less Than) query operator.

GE = <budosystems.storage.query.ComparisonOperator object>¶: GE (Greater Than Or Equal) query operator.

GT = <budosystems.storage.query.ComparisonOperator object>¶: GT (Greater Than) query operator.

EQ = <budosystems.storage.query.ComparisonOperator object>¶: EQ (Equals) query operator.

NE = <budosystems.storage.query.ComparisonOperator object>¶: NE (Not Equals) query operator.

TRUE = <budosystems.storage.query.LiteralExpression object>¶: TRUE query literal.

FALSE = <budosystems.storage.query.LiteralExpression object>¶: FALSE query literal.

NONE = <budosystems.storage.query.LiteralExpression object>¶: NONE query literal.