Felder ändern (mehrere) (Data Management Tools)

Zusammenfassung

Ändert die Feldeigenschaften mehrerer Felder in einer Feature-Class oder Tabelle.

Verwendung

Achtung:

Mit diesem Werkzeug werden die Eingabedaten geändert. Weitere Informationen und Strategien zur Vermeidung unerwünschter Datenänderungen finden Sie unter "Werkzeuge, die Eingabedaten ändern oder aktualisieren".

Mit diesem Werkzeug können Sie Felder oder Feldaliasnamen in einer Geodatabase-Tabelle oder -Feature-Class umbenennen.
Mit diesem Werkzeug können Sie den Feldaliasnamen eines Feldes, der in einer bei der Geodatabase registrierten Tabelle oder Sicht enthalten ist, ändern.
Wenn es sich bei einem Eingabefeld um ein erforderliches Feld handelt, können nur die Feldaliasnamen geändert werden.

Beschriftung	Erläuterung	Datentyp
Eingabetabelle	Die Eingabe-Geodatabase-Tabelle oder -Feature-Class mit dem Feld, das geändert werden soll.	Table View; Raster Layer; Mosaic Layer
Feldeigenschaften (Optional)	Die Felder der Eingabetabelle mit den Eigenschaften, die geändert werden. Spalten der Wertetabelle: Field Name—The name of the field that will be altered. If the field is a required field, only the field alias will be altered. New Field Name—The new name for the field. New Field Alias—The new field alias for the field. New Field Type—Specifies the new field type for the field. This option is only applicable if the input table is empty (does not contain records). Short (16-bit integer)—The field type will be short. Short fields support whole numbers between -32,768 and 32,767. Long (32-bit integer)—The field type will be long. Long fields support whole numbers between -2,147,483,648 and 2,147,483,647. Big integer (64-bit integer)—The field type will be big integer. Big integer fields support whole numbers between -(253) and 253. Float (32-bit floating point)—The field type will be float. Float fields support fractional numbers between -3.4E38 and 1.2E38. Double (64-bit floating point)—The field type will be double. Double fields support fractional numbers between -2.2E308 and 1.8E308. Text—The field type will be text. Text fields support a string of characters. Date—The field type will be date. Date fields support date and time values. Date only—The field type will be date only. Date only fields support date values with no time values. Time only—The field type will be time only. Time only fields support time values with no date values. Timestamp offset—The field type will be timestamp offset. Timestamp offset fields support a date, time, and offset from a UTC value. BLOB (binary data)—The field type will be BLOB. BLOB fields support data stored as a long sequence of binary numbers. You need a custom loader or viewer or a third-party application to load items into a BLOB field or view the contents of a BLOB field. GUID (globally unique identifier)—The field type will be GUID. GUID fields store registry-style strings consisting of 36 characters enclosed in curly brackets. Raster—The field type will be raster. Raster fields can store raster data in or alongside the geodatabase. All ArcGIS software-supported raster dataset formats can be stored, but it is recommended that only small images be used. New Field Length—The new length of the field. This sets the maximum number of allowable characters for each record of the field. This option is only applicable to fields of type Text or Blob. If the table is empty, the field length can be increased or decreased. If the table is not empty, the length can only be increased from the current value. New Field Is Nullable—Specifies whether the field can contain null values. Clear Alias—Specifies whether the alias for the input field will be cleared.	Value Table

Beschriftung

Erläuterung

Datentyp

Eingabetabelle

Die Eingabe-Geodatabase-Tabelle oder -Feature-Class mit dem Feld, das geändert werden soll.

Table View; Raster Layer; Mosaic Layer

Feldeigenschaften

(Optional)

Die Felder der Eingabetabelle mit den Eigenschaften, die geändert werden.

Spalten der Wertetabelle:

Field Name—The name of the field that will be altered. If the field is a required field, only the field alias will be altered.
New Field Name—The new name for the field.
New Field Alias—The new field alias for the field.
New Field Type—Specifies the new field type for the field. This option is only applicable if the input table is empty (does not contain records).
- Short (16-bit integer)—The field type will be short. Short fields support whole numbers between -32,768 and 32,767.
- Long (32-bit integer)—The field type will be long. Long fields support whole numbers between -2,147,483,648 and 2,147,483,647.
- Big integer (64-bit integer)—The field type will be big integer. Big integer fields support whole numbers between -(253) and 253.
- Float (32-bit floating point)—The field type will be float. Float fields support fractional numbers between -3.4E38 and 1.2E38.
- Double (64-bit floating point)—The field type will be double. Double fields support fractional numbers between -2.2E308 and 1.8E308.
- Text—The field type will be text. Text fields support a string of characters.
- Date—The field type will be date. Date fields support date and time values.
- Date only—The field type will be date only. Date only fields support date values with no time values.
- Time only—The field type will be time only. Time only fields support time values with no date values.
- Timestamp offset—The field type will be timestamp offset. Timestamp offset fields support a date, time, and offset from a UTC value.
- BLOB (binary data)—The field type will be BLOB. BLOB fields support data stored as a long sequence of binary numbers. You need a custom loader or viewer or a third-party application to load items into a BLOB field or view the contents of a BLOB field.
- GUID (globally unique identifier)—The field type will be GUID. GUID fields store registry-style strings consisting of 36 characters enclosed in curly brackets.
- Raster—The field type will be raster. Raster fields can store raster data in or alongside the geodatabase. All ArcGIS software-supported raster dataset formats can be stored, but it is recommended that only small images be used.
New Field Length—The new length of the field. This sets the maximum number of allowable characters for each record of the field. This option is only applicable to fields of type Text or Blob. If the table is empty, the field length can be increased or decreased. If the table is not empty, the length can only be increased from the current value.
New Field Is Nullable—Specifies whether the field can contain null values.
Clear Alias—Specifies whether the alias for the input field will be cleared.

Value Table

Abgeleitete Ausgabe

Beschriftung	Erläuterung	Datentyp
Aktualisierte Eingabetabelle	Die aktualisierte Eingabetabelle.	Table View; Raster Layer; Mosaic Layer

arcpy.management.AlterFields(in_table, {field_description})

Name Erläuterung Datentyp

Name	Erläuterung	Datentyp
in_table	Die Eingabe-Geodatabase-Tabelle oder -Feature-Class mit dem Feld, das geändert werden soll.	Table View; Raster Layer; Mosaic Layer
field_description [[Field Name, {New Field Name}, {New Field Alias}, {New Field Type}, {New Field Length}, {New Field IsNullable}, {Clear Alias}],...] (Optional)	Die Felder der Eingabetabelle mit den Eigenschaften, die geändert werden. Spalten der Wertetabelle: `Field Name`—The name of the field that will be altered. If the field is a required field, only the field alias will be altered. `New Field Name`—The new name for the field. `New Field Alias`—The new field alias for the field. `New Field Type`—Specifies the new field type for the field. This option is only applicable if the input table is empty (does not contain records). `SHORT`—The field type will be short. Short fields support whole numbers between -32,768 and 32,767. `LONG`—The field type will be long. Long fields support whole numbers between -2,147,483,648 and 2,147,483,647. `BIGINTEGER`—The field type will be big integer. Big integer fields support whole numbers between -(253) and 253. `FLOAT`—The field type will be float. Float fields support fractional numbers between -3.4E38 and 1.2E38. `DOUBLE`—The field type will be double. Double fields support fractional numbers between -2.2E308 and 1.8E308. `TEXT`—The field type will be text. Text fields support a string of characters. `DATE`—The field type will be date. Date fields support date and time values. `DATEONLY`—The field type will be date only. Date only fields support date values with no time values. `TIMEONLY`—The field type will be time only. Time only fields support time values with no date values. `TIMESTAMPOFFSET`—The field type will be timestamp offset. Timestamp offset fields support a date, time, and offset from a UTC value. `BLOB`—The field type will be BLOB. BLOB fields support data stored as a long sequence of binary numbers. You need a custom loader or viewer or a third-party application to load items into a BLOB field or view the contents of a BLOB field. `GUID`—The field type will be GUID. GUID fields store registry-style strings consisting of 36 characters enclosed in curly brackets. `RASTER`—The field type will be raster. Raster fields can store raster data in or alongside the geodatabase. All ArcGIS software-supported raster dataset formats can be stored, but it is recommended that only small images be used. `New Field Length`—The new length of the field. This sets the maximum number of allowable characters for each record of the field. This option is only applicable to fields of type Text or Blob. If the table is empty, the field length can be increased or decreased. If the table is not empty, the length can only be increased from the current value. `New Field IsNullable`—Specifies whether the field can contain null values. `Clear Alias`—Specifies whether the alias for the input field will be cleared.	Value Table

in_table

Die Eingabe-Geodatabase-Tabelle oder -Feature-Class mit dem Feld, das geändert werden soll.

Table View; Raster Layer; Mosaic Layer

field_description [[Field Name, {New Field Name}, {New Field Alias}, {New Field Type}, {New Field Length}, {New Field IsNullable}, {Clear Alias}],...]

(Optional)

Die Felder der Eingabetabelle mit den Eigenschaften, die geändert werden.

Spalten der Wertetabelle:

Field Name—The name of the field that will be altered. If the field is a required field, only the field alias will be altered.
New Field Name—The new name for the field.
New Field Alias—The new field alias for the field.
New Field Type—Specifies the new field type for the field. This option is only applicable if the input table is empty (does not contain records).
- SHORT—The field type will be short. Short fields support whole numbers between -32,768 and 32,767.
- LONG—The field type will be long. Long fields support whole numbers between -2,147,483,648 and 2,147,483,647.
- BIGINTEGER—The field type will be big integer. Big integer fields support whole numbers between -(253) and 253.
- FLOAT—The field type will be float. Float fields support fractional numbers between -3.4E38 and 1.2E38.
- DOUBLE—The field type will be double. Double fields support fractional numbers between -2.2E308 and 1.8E308.
- TEXT—The field type will be text. Text fields support a string of characters.
- DATE—The field type will be date. Date fields support date and time values.
- DATEONLY—The field type will be date only. Date only fields support date values with no time values.
- TIMEONLY—The field type will be time only. Time only fields support time values with no date values.
- TIMESTAMPOFFSET—The field type will be timestamp offset. Timestamp offset fields support a date, time, and offset from a UTC value.
- BLOB—The field type will be BLOB. BLOB fields support data stored as a long sequence of binary numbers. You need a custom loader or viewer or a third-party application to load items into a BLOB field or view the contents of a BLOB field.
- GUID—The field type will be GUID. GUID fields store registry-style strings consisting of 36 characters enclosed in curly brackets.
- RASTER—The field type will be raster. Raster fields can store raster data in or alongside the geodatabase. All ArcGIS software-supported raster dataset formats can be stored, but it is recommended that only small images be used.
New Field Length—The new length of the field. This sets the maximum number of allowable characters for each record of the field. This option is only applicable to fields of type Text or Blob. If the table is empty, the field length can be increased or decreased. If the table is not empty, the length can only be increased from the current value.
New Field IsNullable—Specifies whether the field can contain null values.
Clear Alias—Specifies whether the alias for the input field will be cleared.

Value Table

Abgeleitete Ausgabe

Name	Erläuterung	Datentyp
out_table	Die aktualisierte Eingabetabelle.	Table View; Raster Layer; Mosaic Layer

Codebeispiel

AlterFields: Beispiel 1 (eigenständiges Skript)

Das folgende eigenständige Skript veranschaulicht, wie mit der Funktion AlterFields die Feldaliasnamen von Feldern in einer Feature-Class geändert werden.

import arcpy

test_class = arcpy.management.CreateFeatureclass(out_gdb, "new_fc", geometry_type='POLYGON')
field_description = [
    ['SHORT_FIELD', 'SHORT', 'SHORT_FIELD_Alias', '#', '#', '#'],
    ['LONG_FIELD', 'LONG', 'LONG_FIELD_Alias', '#', '#', '#'],
    ['BIGINTEGER_FIELD', 'BIGINTEGER', 'BIGINTEGER_FIELD_Alias', '#', '#', '#'],
    ['FLOAT_FIELD', 'FLOAT', 'FLOAT_FIELD_Alias', '#', '#', '#'],
    ['DOUBLE_FIELD', 'DOUBLE', 'DOUBLE_FIELD_Alias', '#', '#', '#'],
    ['TEXT_FIELD', 'TEXT', 'TEXT_FIELD_Alias', '#', '#', '#'],
    ['DATE_FIELD', 'DATE', 'DATE_FIELD_Alias', '#', '#', '#'],
    ['DATEONLY_FIELD', 'DATEONLY', 'DATEONLY_FIELD_Alias', '#', '#', '#'],
    ['TIMEONLY_FIELD', 'TIMEONLY', 'TIMEONLY_FIELD_Alias', '#', '#', '#'],
    ['TIMESTAMPOFFSET_FIELD', 'TIMESTAMPOFFSET', 'TIMESTAMPOFFSET_FIELD_Alias', '#', '#', '#']
]
arcpy.management.AddFields(test_class, field_description, None)

alter_field_description = [
    ['SHORT_FIELD', 'SHORT_FIELD_altered', '#', '#', '#', '#'],
    ['LONG_FIELD', 'LONG_FIELD_altered', '#', '#', '#', '#'],
    ['BIGINTEGER_FIELD', 'BIGINTEGER_FIELD_altered', '#', '#', '#', '#'],
    ['FLOAT_FIELD', 'FLOAT_FIELD_altered', '#', '#', '#', '#'],
    ['DOUBLE_FIELD', 'DOUBLE_FIELD_altered', '#', '#', '#', '#'],
    ['TEXT_FIELD', 'TEXT_FIELD_altered', '#', '#', '#', '#'],
    ['DATE_FIELD', 'DATE_FIELD_altered', '#', '#', '#', '#'],
    ['DATEONLY_FIELD', 'DATEONLY_FIELD_altered', '#', '#', '#', '#'],
    ['TIMEONLY_FIELD', 'TIMEONLY_FIELD_altered', '#', '#', '#', '#'],
    ['TIMESTAMPOFFSET_FIELD', 'TIMESTAMPOFFSET_FIELD_altered', '#', '#', '#', '#']
]
arcpy.management.AlterFields(in_table=test_class, field_description=alter_field_description)

AlterFields: Beispiel 2 (eigenständiges Skript)

Das folgende eigenständige Skript veranschaulicht, wie mit der Funktion AlterFields für Felder in einer leeren Tabelle die Feldeigenschaft für NULL-Werte geändert wird.

import arcpy

test_class = arcpy.management.CreateTable(out_gdb, "new_table")
field_description = [
    ['SHORT_FIELD', 'SHORT', 'SHORT_FIELD_Alias', '#', '#', '#'],
    ['LONG_FIELD', 'LONG', 'LONG_FIELD_Alias', '#', '#', '#'],
    ['BIGINTEGER_FIELD', 'BIGINTEGER', 'BIGINTEGER_FIELD_Alias', '#', '#', '#'],
    ['FLOAT_FIELD', 'FLOAT', 'FLOAT_FIELD_Alias', '#', '#', '#'],
    ['DOUBLE_FIELD', 'DOUBLE', 'DOUBLE_FIELD_Alias', '#', '#', '#'],
    ['TEXT_FIELD', 'TEXT', 'TEXT_FIELD_Alias', '#', '#', '#'],
    ['DATE_FIELD', 'DATE', 'DATE_FIELD_Alias', '#', '#', '#'],
    ['DATEONLY_FIELD', 'DATEONLY', 'DATEONLY_FIELD_Alias', '#', '#', '#'],
    ['TIMEONLY_FIELD', 'TIMEONLY', 'TIMEONLY_FIELD_Alias', '#', '#', '#'],
    ['TIMESTAMPOFFSET_FIELD', 'TIMESTAMPOFFSET', 'TIMESTAMPOFFSET_FIELD_Alias', '#', '#', '#']
]

arcpy.management.AddFields(test_class, field_description, None)

# Change the nullable property to true
alter_field_description = [
    ['SHORT_FIELD', '#', '#', '#','#', 'true', '#'],
    ['LONG_FIELD', '#', '#', '#','#', 'true', '#'],
    ['BIGINTEGER_FIELD', '#', '#', '#','#', 'true', '#'],
    ['FLOAT_FIELD', '#', '#', '#','#', 'true', '#'],
    ['DOUBLE_FIELD', '#', '#', '#','#', 'true', '#'],
    ['TEXT_FIELD', '#', '#', '#','#', 'true', '#'],
    ['DATE_FIELD', '#', '#', '#','#', 'true', '#'],
    ['DATEONLY_FIELD', '#', '#', '#','#', 'true', '#'],
    ['TIMEONLY_FIELD', '#', '#', '#','#', 'true', '#'],
    ['TIMESTAMPOFFSET_FIELD', '#', '#', '#','#', 'true', '#']
]

arcpy.management.AlterFields(in_table=test_class, field_description=alter_field_description)

Umgebungen

Aktueller Workspace

Lizenzierungsinformationen

Basic: Ja
Standard: Ja
Advanced: Ja

Felder ändern (mehrere) (Data Management Tools)

Zusammenfassung

Verwendung

Achtung:

Parameter

Abgeleitete Ausgabe

Umgebungen

Lizenzierungsinformationen

Verwandte Themen