Class: QgsExpressionNodeColumnRef¶

An expression node which takes its value from a feature’s field.

Class Hierarchy¶

Base classes¶

QgsExpressionNode

Abstract base class for all nodes that can appear in an expression.

Methods

name

The name of the column.

Virtual Methods

In PyQGIS, only methods marked as virtual can be safely overridden in a Python subclass of QgsExpressionNodeColumnRef. See the FAQ for more details.

`evalNode`
`prepareNode`

class qgis.core.QgsExpressionNodeColumnRef[source]¶

Bases: QgsExpressionNode

__init__(name: str | None)

Constructor for QgsExpressionNodeColumnRef, referencing the column with the specified name.

Parameters:: name (Optional[str])

__init__(a0: QgsExpressionNodeColumnRef)

Parameters:: a0 (QgsExpressionNodeColumnRef)

virtual evalNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → Any[source]¶

Parameters:

parent (Optional[QgsExpression])
context (Optional[QgsExpressionContext])

Return type:

Any

name(self) → str[source]¶

The name of the column.

Return type:: str

virtual prepareNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool[source]¶

Parameters:

parent (Optional[QgsExpression])
context (Optional[QgsExpressionContext])

Return type:

bool