QGIS Algorithm provided by QGIS (native c++) Extract by attribute (native:extractbyattribute). This algorithm creates a new vector layer that only contains matching features from an input layer. The criteria for adding features to the resulting layer is defined based on the values of an attribute from the input layer.

qgis_extractbyattribute(
  INPUT = qgisprocess:::qgis_default_value(),
  FIELD = qgisprocess:::qgis_default_value(),
  OPERATOR = qgisprocess:::qgis_default_value(),
  VALUE = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  FAIL_OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

INPUT

source - Input layer. Path to a vector layer.

FIELD

field - Selection attribute. The name of an existing field. ; delimited list of existing field names.

OPERATOR

enum of ("=", "≠", "", "≥", "", "≤", "begins with", "contains", "is null", "is not null", "does not contain") - Operator. Number of selected option, e.g. '1'. Comma separated list of options, e.g. '1,3'.

VALUE

string - Value. String value. field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field. expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression.

OUTPUT

sink - Extracted (attribute). Path for new vector layer.

FAIL_OUTPUT

sink - Extracted (non-matching). Path for new vector layer.

...

further parameters passed to qgisprocess::qgis_run_algorithm()

.complete_output

logical specifying if complete out of qgisprocess::qgis_run_algorithm() should be used (TRUE) or first output (most likely the main) should read (FALSE). Default value is TRUE.

.quiet

logical specifying if parameter .quiet for qgisprocess::qgis_run_algorithm() Default value is TRUE.

.messages

logical specifying if messages from qgisprocess::qgis_run_algorithm() should be printed (TRUE) or not (FALSE). Default value is FALSE.

Details

Outputs description

  • FAIL_OUTPUT - outputVector - Extracted (non-matching)

  • OUTPUT - outputVector - Extracted (attribute)