Data.DB.DefaultFieldClasses

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Delphi

DefaultFieldClasses: array[TFieldType] of TFieldClass = (
nil,                       { ftUnknown }
TStringField,              { ftString }
TSmallintField,            { ftSmallint }
TIntegerField,             { ftInteger }
TWordField,                { ftWord }
TBooleanField,             { ftBoolean }
TFloatField,               { ftFloat }
TCurrencyField,            { ftCurrency }
TBCDField,                 { ftBCD }
TDateField,                { ftDate }
TTimeField,                { ftTime }
TDateTimeField,            { ftDateTime }
TBytesField,               { ftBytes }
TVarBytesField,            { ftVarBytes }
TAutoIncField,             { ftAutoInc }
TBlobField,                { ftBlob }
TMemoField,                { ftMemo }
TGraphicField,             { ftGraphic }
TBlobField,                { ftFmtMemo }
TBlobField,                { ftParadoxOle }
TBlobField,                { ftDBaseOle }
TBlobField,                { ftTypedBinary }
nil,                       { ftCursor }
TStringField,              { ftFixedChar }
TWideStringField,          { ftWideString }
TLargeIntField,            { ftLargeInt }
TADTField,                 { ftADT }
TArrayField,               { ftArray }
TReferenceField,           { ftReference }
TDataSetField,             { ftDataSet }
TBlobField,                { ftOraBlob }
TMemoField,                { ftOraClob }
TVariantField,             { ftVariant }
TInterfaceField,           { ftInterface }
TIDispatchField,           { ftIDispatch }
TGuidField,                { ftGuid }
TSQLTimeStampField,        { ftTimeStamp }
TFMTBcdField,              { ftFMTBcd }
TWideStringField,          { ftFixedWideChar }
TWideMemoField,            { ftWideMemo }
TSQLTimeStampField,        { ftOraTimeStamp }
TStringField,              { ftOraInterval }
TLongWordField,            { ftLongWord }
TShortintField,            { ftShortint }
TByteField,                { ftByte }
TExtendedField,
nil,                       { ftConnection }
nil,                       { ftParams }
nil,                       { ftStream }
TSQLTimeStampOffsetField,  { ftTimeStampOffset }
nil,                       { ftObject }
TSingleField);             { ftSingle }

C++

extern DELPHI_PACKAGE System::StaticArray<TFieldClass, 52> DefaultFieldClasses;

Properties

Type	Visibility	Source	Unit	Parent
variable	public	Data.DB.pas Data.DB.hpp	Data.DB	Data.DB

Description

Array that holds references to field classes according to field types.

DefaultFieldClasses is an array that holds field classes according to field types. The array members are initialized with the values listed in the following table, under the Member column:

Member	Description
nil	Unknown or undetermined (ftUnknown)
TStringField	Character or string field (ftString)
TSmallintField	16-bit integer field (ftSmallint)
TIntegerField	32-bit integer field (ftInteger)
TWordField	16-bit unsigned integer field (ftWord)
TBooleanField	Boolean field (ftBoolean)
TFloatField	Floating-point numeric field (ftFloat)
TCurrencyField	Money field (ftCurrency)
TBCDField	Binary-coded Decimal field that can be converted to the Currency type without loss of precision (ftBCD)
TDateField	Date field (ftDate)
TTimeField	Time field (ftTime)
TDateTimeField	Date and time field (ftDateTime)
TBytesField	Fixed number of bytes (binary storage) (ftBytes)
TVarBytesField	Variable number of bytes (binary storage) (ftVarBytes)
TAutoIncField	Auto-incrementing 32-bit integer counter field (ftAutoInc)
TBlobField	Binary Large Object field (ftBlob)
TMemoField	Text memo field (ftMemo)
TGraphicField	Bitmap field (ftGraphic)
TBlobField	Formatted text memo field (ftFmtMemo)
TBlobField	Paradox OLE field (ftParadoxOle)
TBlobField	dBASE OLE field (ftDBaseOle)
TBlobField	Typed binary field (ftTypedBinary)
nil	Output cursor from an Oracle stored procedure (TParam only) (ftCursor)
TStringField	Fixed character field (ftFixedChar)
TWideStringField	Wide string field (ftWideString)
TLargeintField	Int64 large integer field (ftLargeint)
TADTField	Abstract Data Type field (ftADT)
TArrayField	Array field (ftArray)
TReferenceField	REF field (ftReference)
TDataSetField	DataSet field (ftDataSet)
TBlobField	BLOB fields in Oracle 8 tables (ftOraBlob)
TMemoField	CLOB fields in Oracle 8 tables (ftOraClob)
TVariantField	Data of unknown or undetermined type (ftVariant)
TInterfaceField	References to interfaces (IUnknown) (ftInterface)
TIDispatchField	References to IDispatch interfaces (ftIDispatch)
TGuidField	Globally unique identifier (GUID) values (ftGuid)
TSQLTimeStampField	Date and time field accessed through dbExpress (ftTimeStamp)
TFMTBCDField	Binary-coded decimal field that is too large for ftBCD (ftFMTBcd)
TWideStringField	A large string field in a dataset (ftFixedWideChar)
TWideMemoField	A memo field in a dataset (ftWideMemo)
TSQLTimeStampField	A date-time field in a DBExpress dataset (ftOraTimeStamp)
TStringField	A string field in a dataset (ftOraInterval)
TLongWordField	A field that contains a 32-bit positive integer value in a dataset (ftLongWord)
TShortintField	A field that contains a small integer value in a dataset (ftShortint)
TByteField	A field that contains a byte value in a dataset (ftByte)
TExtendedField	A field that contains the highest precision floating-point value in a dataset (ftExtended)
nil	Field type for TParams (ftParams)
nil	Field type for the TStream parameter (ftStream)
TSQLTimeStampOffsetField	Timestamp field with time/zone information (ftTimeStampOffset)
nil	Field type for the TObject parameter; only for DataSnap (ftObject)
TSingleField	Single precision floating-point number (ftSingle)

For example:

DefaultFieldClasses[ftUnknown] = nil;
DefaultFieldClasses[ftBlob] = TBlobField;
DefaultFieldClasses[ftConnection] = nil;
DefaultFieldClasses[ftSingle] = TSingleField;

See Also

• System.StaticArray

• TFieldType
• TFieldClass