InsertCursor

Resumen

InsertCursor establishes a write cursor on a feature class or table. InsertCursor can be used to add new rows.

Learn more about data access using cursors

Debate

When using InsertCursor on a point feature class, creating a PointGeometry and setting it to the SHAPE@ token is a comparatively expensive operation. Instead, define the point feature using tokens such as SHAPE@XY, SHAPE@Z, and SHAPE@M for faster, more efficient access.

La apertura de operaciones de inserción o actualización simultáneas en el mismo espacio de trabajo con distintos cursores requiere que se inice una sesión de edición.

A continuación, se incluyen algunos tipos de datasets que solo se pueden editar en una sesión de edición:

• Clases de entidad que forman parte de una topología
• Clases de entidad que forman parte de una red geométrica
• Clases de entidad que forman parte de un dataset de red
• Datasets versionados en geodatabases corporativas
• Algunas clases de entidad y objetos con extensiones de clase

Nota:

Using an InsertCursor on a layer with a joined table is not supported.

When a field has a default value, a cursor applies the default value when the field is not specified or is set to None.

Sintaxis

InsertCursor (in_table, field_names, {datum_transformation}, {explicit})

Parámetro	Explicación	Tipo de datos
in_table	The feature class, layer, table, or table view.	String
field_names [field_names,...]	A list (or tuple) of field names. For a single field, you can use a string instead of a list of strings. Use an asterisk (*) instead of a list of fields to access all fields from the input table (BLOB fields are excluded). However, for faster performance and reliable field order, it is recommended that the list of fields be narrowed to only those that are actually needed. Raster fields are not supported. Additional information can be accessed using tokens (such as OID@) in place of field names: SHAPE@XY—Una tupla de las coordenadas x,y del centroide de la entidad. SHAPE@XYZ—Una tupla de las coordenadas x, y, z del centroide de la entidad. SHAPE@TRUECENTROID—Una tupla de las coordenadas x,y del centroide de la entidad. Devuelve el mismo valor que SHAPE@XY. SHAPE@X—Un doble de la coordenada x de la entidad. SHAPE@Y—Un doble de la coordenada y de la entidad. SHAPE@Z—Un doble de la coordenada z de la entidad. SHAPE@M—Un doble del valor m de la entidad. SHAPE@JSON—La cadena de caracteres JSON de Esri que representa la geometría. SHAPE@WKB—Representación binaria conocida (WKB) para geometría OGC. Ofrece una representación portátil de un valor de geometría como una transmisión contigua de bytes.Los valores se pueden agregar como un objeto bytearray o bytes. SHAPE@WKT—Representación en texto conocida (WKT) para geometría OGC. Ofrece una representación portátil de un valor de geometría como cadena de caracteres. SHAPE@—Objeto de geometría para la entidad. SUBTYPE@—Un entero del código de subtipo. Polygon, polyline, or multipoint features can only be created using the SHAPE@ token.	String
datum_transformation	When features to be inserted have a different spatial reference than the target feature class, a projection will be performed automatically. If the two spatial references have a different datum, an appropriate transformation should be specified. The ListTransformations function can be used to provide a list of valid datum transformations between two spatial references. Learn more about datum transformations	String
explicit [explicit,...]	If a field has a default value and the field is nullable, using a value of True will explicitly override the default value and insert null values into the record. When using a value of False, the default value will be inserted instead of null. Apply the explicit rule to all fields: with arcpy.da.InsertCursor(table, [field1, field2, field3], explicit=True) as cursor: ... The explicit rule can also be applied to individual fields using a list of Boolean values. The list of values must be the same length as the list of fields. Apply the explicit rule to only the first two fields specified: with arcpy.da.InsertCursor(table, [field1, field2, field3], explicit=[True, True, False]) as cursor: # ... (El valor predeterminado es False)	Boolean

Propiedades

Propiedad	Explicación	Tipo de datos
fields (Sólo lectura)	A tuple of field names used by the cursor. The tuple will include all fields and tokens specified by the field_names argument. The order of the field names on the fields property will be the same as passed in with the field_names argument. If the field_names argument is set to *, the fields property will include all fields used by the cursor. A value of * will return geometry in a tuple of x,y coordinates (equivalent to the SHAPE@XY token).	tuple

Descripción general del método

Método	Explicación
insertRow (row)	Inserts a row into a table.

Métodos

insertRow (row)

Parámetro	Explicación	Tipo de datos
row [row,...]	A list or tuple of values. The order of values must be in the same order as specified when creating the cursor. When updating fields, if the incoming values match the type of field, the values will be cast as necessary. For example, a value of 1.0 to a string field will be added as "1.0", and a value of "25" added to a float field will be added as 25.0.	tuple

Valor de retorno

Tipo de datos	Explicación
Integer	insertRow returns the objectid of the new row.

Muestra de código

InsertCursor example 1

Use InsertCursor to insert new rows into a table.

import arcpy
import datetime

# Create an insert cursor for a table specifying the fields that will
# have values provided
fields = ['rowid', 'distance', 'CFCC', 'DateInsp']

with arcpy.da.InsertCursor('D:/data/base.gdb/roads_maint', fields) as cursor:

    # Create 25 new rows. Set default values on distance and CFCC code
    for x in range(0, 25):
        cursor.insertRow((x, 100, 'A10', datetime.datetime.now()))

InsertCursor example 2

Use InsertCursor with the SHAPE@XY token to add point features to a point feature class.

import arcpy

# A list of values that will be used to construct new rows
row_values = [('Anderson', (1409934.4442000017, 1076766.8192000017)),
              ('Andrews', (752000.2489000037, 1128929.8114))]

# Open an InsertCursor using a context manager
with arcpy.da.InsertCursor('C:/data/texas.gdb/counties', ['NAME', 'SHAPE@XY']) as cursor:

    # Insert new rows that include the county name and a x,y coordinate
    #  pair that represents the county center
    for row in row_values:
        cursor.insertRow(row)

InsertCursor example 3

Use InsertCursor with the SHAPE@ token to add a new feature using a geometry object.

import arcpy

# Create a polyline geometry
array = arcpy.Array([arcpy.Point(459111.6681, 5010433.1285),
                     arcpy.Point(472516.3818, 5001431.0808),
                     arcpy.Point(477710.8185, 4986587.1063)])
polyline = arcpy.Polyline(array)

# Open an InsertCursor using a context manager and insert the new geometry
with arcpy.da.InsertCursor('C:/data/texas.gdb/counties', ['SHAPE@']) as cursor:
    cursor.insertRow([polyline])