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ftBoolean

ftBoolean = 5

Example​

function IsBooleanField(Field: TField): Boolean;
begin
  Result := Field.DataType = ftBoolean;
end;

Usage​

ftBoolean identifies a Boolean dataset field while leaving Null as an independent third state and provider encodings outside the enum.

Additional Technical Info​

ftBoolean is declaration ordinal 5 of TFieldType. It identifies a logical True/False field. Field.IsNull remains independent, so nullable data has three observable states: Null, False and True.

The enum does not define database encodings such as 0/1, Y/N or BIT, nor text serialization. Use the field/provider conversion and define outbound representation explicitly. Never coerce Null to False unless the business contract requires that loss of distinction.

The example only inspects metadata and was source-reviewed; no dataset/database/runtime/image test ran.

Created 2026-07-15