Alterar campos (múltiple) (Herramientas de administración de datos)

Resumen

Modifica las propiedades del campo de varios campos de una tabla o clase de entidad.

Uso

Precaución:

Esta herramienta modifica los datos de entrada. Consulte Herramientas que modifican o actualizan los datos de entrada para obtener más información y estrategias para evitar cambios de datos no deseados.

Esta herramienta le permite cambiar el nombre o alias de los campos de una tabla o clase de entidad de la geodatabase.
Puede utilizar esta herramienta para modificar el alias de campo de una campo de una tabla o vista registrada en la base de datos.
Si un campo de entrada es un campo obligatorio, solo es posible modificar el alias del campo.

Etiqueta	Explicación	Tipo de datos
Tabla de entrada	Clase de entidad o tabla de geodatabase de entrada que contiene el campo que se va a modificar.	Table View; Raster Layer; Mosaic Layer
Propiedades del campo (Opcional)	Campos de la tabla de entrada y sus propiedades que se modificarán. Columnas de la tabla de valores: 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

Etiqueta

Explicación

Tipo de datos

Tabla de entrada

Clase de entidad o tabla de geodatabase de entrada que contiene el campo que se va a modificar.

Table View; Raster Layer; Mosaic Layer

Propiedades del campo

(Opcional)

Campos de la tabla de entrada y sus propiedades que se modificarán.

Columnas de la tabla de valores:

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

Salida derivada

Etiqueta	Explicación	Tipo de datos
Tabla de entrada actualizada	La tabla de entrada actualizada.	Table View; Raster Layer; Mosaic Layer

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

Nombre Explicación Tipo de datos

Nombre	Explicación	Tipo de datos
in_table	Clase de entidad o tabla de geodatabase de entrada que contiene el campo que se va a modificar.	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}],...] (Opcional)	Campos de la tabla de entrada y sus propiedades que se modificarán. Columnas de la tabla de valores: `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

Clase de entidad o tabla de geodatabase de entrada que contiene el campo que se va a modificar.

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}],...]

(Opcional)

Campos de la tabla de entrada y sus propiedades que se modificarán.

Columnas de la tabla de valores:

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

Salida derivada

Nombre	Explicación	Tipo de datos
out_table	La tabla de entrada actualizada.	Table View; Raster Layer; Mosaic Layer

Muestra de código

Ejemplo 1 de "AlterFields" (secuencia de comandos independiente)

La siguiente secuencia de comandos independiente muestra cómo utilizar la función AlterFields para modificar los alias de campo de los campos de una clase de entidad.

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)

Ejemplo 2 de "AlterFields" (secuencia de comandos independiente)

El siguiente script independiente muestra cómo utilizar la función AlterFields para modificar la propiedad "is nullable field" de los campos de una tabla vacía.

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)

Entornos

Espacio de trabajo actual

Información de licenciamiento

Basic: Sí
Standard: Sí
Avanzado: Sí

Alterar campos (múltiple) (Herramientas de administración de datos)

Resumen

Uso

Precaución:

Parámetros

Salida derivada

Entornos

Información de licenciamiento

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