[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'DB' (#fcl)

# DefaultFieldClasses

Default field classes to use when creating a new TField instance.

## Declaration

Source position: db.pas line 2194

`const DefaultFieldClasses: array [TFieldType] of TFieldClass = (Tfield, TStringField, TSmallIntField, TLongintField, TWordField, TBooleanField, TFloatField, TCurrencyField, TBCDField, TDateField, TTimeField, TDateTimeField, TBytesField, TVarBytesField, TAutoIncField, TBlobField, TMemoField, TGraphicField, TBlobField, TBlobField, TBlobField, TBlobField, Nil, TStringField, TWideStringField, TLargeIntField, Nil, Nil, Nil, Nil, TBlobField, TMemoField, TVariantField, Nil, Nil, TGuidField, Nil, TFMTBCDField, TWideStringField, TWideMemoField);`

## Description

DefaultFieldClasses contains the TField descendent class to use when a TDataset instance needs to create fields based on the TFieldDefs field definitions when opening the dataset. The entries can be set to create customized TField descendents for certain field datatypes in all datasets.

## See also

TFieldType |  | Field data type description
TField |  | Provide access to the contents of a single field in a record
TField.DataType |  | The data type of the field.