Class: QgsTransactionGroup

Represents a transaction group.

Class Hierarchy

Base classes

QObject

class qgis.core.QgsTransactionGroup

Bases: QObject

__init__(parent: QObject | None = None)

Constructor for QgsTransactionGroup

Parameters:

parent (Optional[QObject] = None)

addLayer(self, layer: QgsVectorLayer | None) → bool

Add a layer to this transaction group.

Will return True if it is compatible and has been added.

Parameters:

layer (Optional[QgsVectorLayer])

Return type:

bool

signal commitError

pyqtSignal(*types, name: str = …, revision: int = …, arguments: Sequence = …) -> PYQT_SIGNAL

types is normally a sequence of individual types. Each type is either a type object or a string that is the name of a C++ type. Alternatively each type could itself be a sequence of types each describing a different overloaded signal. name is the optional C++ name of the signal. If it is not specified then the name of the class attribute that is bound to the signal is used. revision is the optional revision of the signal that is exported to QML. If it is not specified then 0 is used. arguments is the optional sequence of the names of the signal’s arguments.

connString(self) → str

Returns the connection string used by this transaction group. Layers need be compatible when added.

Return type:

str

isEmpty(self) → bool

Returns True if there are no layers in this transaction group.

Return type:

bool

layers(self) → Set[QgsVectorLayer]

Gets the set of layers currently managed by this transaction group.

Return type:

Set[QgsVectorLayer]

Returns:

Layer set

modified(self) → bool

Returns True if any of the layers in this group reports a modification.

Return type:

bool

providerKey(self) → str

Returns the provider key used by this transaction group. Layers need be compatible when added.

Return type:

str