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TableDef.CreateField Method (DAO)
Время создания: 16.03.2019 23:43
Текстовые метки: VBA_Acces, CreateField, DAO
Раздел: !Закладки - VBA - Access

TableDef.CreateField Method (DAO)

Office 2013 and later

Other Versions

Last modified: March 09, 2015

Applies to: Access 2013 | Office 2013

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Creates a new Field object (Microsoft Access workspaces only).



expression .CreateField(Name, Type, Size)

expression A variable that represents a TableDef object.




Data Type





A String that uniquely names the new Field object. See the Name property for details on valid Field names.




A constant that determines the data type of the new Field object. See the Type property for valid data types.




An Integer that indicates the maximum size, in bytes, of a Field object that contains text. See the Size property for valid size values. This argument is ignored for numeric and fixed-width fields.

Return Value




You can use the CreateField method to create a new field, as well as specify the name, data type, and size of the field. If you omit one or more of the optional parts when you use CreateField, you can use an appropriate assignment statement to set or reset the corresponding property before you append the new object to a collection. After you append the new object, you can alter some but not all of its property settings. See the individual property topics for more details.

The type and Size arguments apply only to Field objects in a TableDef object. These arguments are ignored when a Field object is associated with an Index or Relation object.

If Name refers to an object that is already a member of the collection, a run-time error occurs when you use the Append method.

To remove a Field object from a Fields collection, use the Delete method on the collection. You can't delete a Field object from a TableDef object's Fields collection after you create an index that references the field.

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• Adding a hyperlink field to an existing table with DAO



The following example shows how to create a calculated field. The CreateField method creates a field named FullName. The Expression property is then set to the expression that calculates the value of the field.

Sample code provided by: The Microsoft Access 2010 Programmer’s Reference | About the Contributors



Sub CreateCalculatedField()

Dim dbs As DAO.Database

Dim tdf As DAO.TableDef

Dim fld As DAO.Field2

' get the database

Set dbs = CurrentDb()

' create the table

Set tdf = dbs.CreateTableDef("tblContactsCalcField")

' create the fields: first name, last name

tdf.Fields.Append tdf.CreateField("FirstName", dbText, 20)

tdf.Fields.Append tdf.CreateField("LastName", dbText, 20)

' create the calculated field: full name

Set fld = tdf.CreateField("FullName", dbText, 50)

fld.Expression = "[FirstName] & "" "" & [LastName]"

tdf.Fields.Append fld

' append the table and cleanup

dbs.TableDefs.Append tdf


Set fld = Nothing

Set tdf = Nothing

Set dbs = Nothing

End Sub

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