Class: QgsExpressionNodeColumnRef

class qgis.core.QgsExpressionNodeColumnRef

Bases: QgsExpressionNode

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

QgsExpressionNodeColumnRef(name: Optional[str]) Constructor for QgsExpressionNodeColumnRef, referencing the column with the specified name.

QgsExpressionNodeColumnRef(a0: QgsExpressionNodeColumnRef)

Methods

clone	rtype: Optional[QgsExpressionNode]
dump	rtype: str
evalNode	param parent:
isStatic	param parent:
name	The name of the column.
needsGeometry	rtype: bool
nodeType	rtype: QgsExpressionNode.NodeType
prepareNode	param parent:
referencedColumns	rtype: Set[str]
referencedFunctions	rtype: Set[str]
referencedVariables	rtype: Set[str]

clone(self) → QgsExpressionNode | None

Return type:

Optional[QgsExpressionNode]

dump(self) → str

Return type:

str

evalNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → Any

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

Any

isStatic(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

bool

name(self) → str

The name of the column.

Return type:

str

needsGeometry(self) → bool

Return type:

bool

nodeType(self) → QgsExpressionNode.NodeType

Return type:

QgsExpressionNode.NodeType

prepareNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

bool

referencedColumns(self) → Set[str]

Return type:

Set[str]

referencedFunctions(self) → Set[str]

Return type:

Set[str]

referencedVariables(self) → Set[str]

Return type:

Set[str]