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Field

サマリー

The Field object represents a column in a table.

ディスカッション

Field properties can be accessed through the ListFields and Describe functions.

Updating a field property only updates the Field object; no changes are made to the actual field in the table or feature class.

構文

Field()

プロパティ

名前 説明 データ タイプ

aliasName

(読み取り/書き込み)

The alias name of the field.

String

baseName

(読み取り/書き込み)

The unqualified field name.

String

defaultValue

(読み取り/書き込み)

The default value of the field.

Variant

domain

(読み取り/書き込み)

The name of the associated domain.

String

editable

(読み取り/書き込み)

Specifies whether the field is editable.

Boolean

isNullable

(読み取り/書き込み)

Specifies whether the field can contain null values.

Boolean

length

(読み取り/書き込み)

The length of the field.

Integer

name

(読み取り/書き込み)

The name of the field.

String

precision

(読み取り/書き込み)

The precision for field values.

For fields of type Date, the precision can be either 0 or 1.

  • 0—A regular date field. Data will be stored to the second (1/60 of a minute).

  • 1—A high precision date field. Data will be stored to the millisecond (1/1000 of a second).

Integer

required

(読み取り/書き込み)

Specifies whether the field is required. A required field cannot be deleted.

Boolean

scale

(読み取り/書き込み)

The scale of the field.

Integer

type

(読み取り/書き込み)

Specifies the field type.

  • Blob—The field type will be BLOB.

  • BigInteger—The field type will be Big Integer.

  • Date—The field type will be Date.

  • DateOnly—The field type will be Date Only.

  • Double—The field type will be Double.

  • Geometry—The field type will be Geometry.

  • GlobalID—The field type will be Global ID.

  • Guid—The field type will be GUID.

  • Integer—The field type will be Integer (Long Integer).

  • OID—The field type will be Object ID.

  • Raster—The field type will be Raster.

  • Single—The field type will be Single (Float).

  • SmallInteger—The field type will be Small Integer (Short Integer).

  • String—The field type will be String (Text).

  • TimeOnly—The field type will be Time Only.

  • TimestampOffset—The field type will be Timestamp Offset.

注意:

The Field object's type property values are not an exact match for the keywords used by the Add Field tool's field_type parameter. Despite this, all of the Field object's type values are acceptable values as input to this parameter. The different field types are mapped as follows:

  • Integer to LONG

  • String to TEXT

  • SmallInteger to SHORT

String

コードのサンプル

Field example

Display field properties for the specified feature class.

import arcpy

feature_class = "c:/data/counties.shp"

# Create a list of fields using the ListFields function
fields = arcpy.ListFields(feature_class)

# Iterate through the list of fields
for field in fields:
    # Print field properties
    print("Field:       {0}".format(field.name))
    print("Alias:       {0}".format(field.aliasName))
    print("Type:        {0}".format(field.type))
    print("Is Editable: {0}".format(field.editable))
    print("Required:    {0}".format(field.required))
    print("Scale:       {0}".format(field.scale))
    print("Precision:   {0}".format(field.precision))