InsertCursor

Resumen

InsertCursor establece un cursor de escritura en una tabla o clase de entidad. InsertCursor se puede utilizar para agregar nuevas filas.

Debate

Al utilizar InsertCursor en una clase de entidad de punto, crear un PointGeometry y definirlo en el token SHAPE@ es una operación costosa en comparación. En su lugar, defina la entidad de punto con tokens como SHAPE@XY, SHAPE@Z y SHAPE@M para un acceso más rápido y eficiente.

Nota:

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.

Sintaxis

InsertCursor (in_table, field_names, datum_transformation)

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 (raster and 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 —A tuple of the feature's centroid x,y coordinates. SHAPE@XYZ —A tuple of the feature's centroid x,y,z coordinates. SHAPE@TRUECENTROID —A tuple of the feature's centroid x,y coordinates. This returns the same value as SHAPE@XY. SHAPE@X —A double of the feature's x-coordinate. SHAPE@Y —A double of the feature's y-coordinate. SHAPE@Z —A double of the feature's z-coordinate. SHAPE@M —A double of the feature's m-value. SHAPE@JSON — The Esri JSON string representing the geometry. SHAPE@WKB —The well-known binary (WKB) representation for OGC geometry. It provides a portable representation of a geometry value as a contiguous stream of bytes. SHAPE@WKT —The well-known text (WKT) representation for OGC geometry. It provides a portable representation of a geometry value as a text string. SHAPE@ —A geometry object for the feature. 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

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. If the field_names argument is set to *, the fields property will include all fields used by the cursor. When using *, geometry values will be returned in a tuple of the x,y-coordinates (equivalent to the SHAPE@XY token). The order of the field names on the fields property will be the same as passed in with the field_names argument.	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

Use InsertCursor para insertar nuevas filas en una tabla.

import arcpy
import datetime

# Create an insert cursor for a table specifying the fields that will
# have values provided
fields = ['rowid', 'distance', 'CFCC', 'DateInsp']
cursor = arcpy.da.InsertCursor('D:/data/base.gdb/roads_maint', fields)

# 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()))

# Delete cursor object
del cursor

Use InsertCursor con el token SHAPE@XY para agregar entidades de puntos a una clase de entidad de puntos.

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
cursor = arcpy.da.InsertCursor('C:/data/texas.gdb/counties',
                               ['NAME', 'SHAPE@XY'])

# 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)

# Delete cursor object
del cursor

Use InsertCursor con el token SHAPE@ para agregar una nueva entidad con un objeto de geometría.

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 and insert the new geometry
cursor = arcpy.da.InsertCursor('C:/data/texas.gdb/counties', ['SHAPE@'])
cursor.insertRow([polyline])

# Delete cursor object
del cursor