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ftFloat

ftFloat = 6

Example​

function IsDoublePrecisionField(Field: TField): Boolean;
begin
  Result := Field.DataType = ftFloat;
end;

Usage​

ftFloat identifies the Double-precision binary floating field family and its approximation, comparison and decimal-round-trip limits.

Additional Technical Info​

ftFloat is declaration ordinal 6 of TFieldType and denotes the common Double-precision binary floating field family. It typically provides about 15-16 significant decimal digits, not exact decimal storage.

Use tolerance/domain-aware comparison and an explicit invariant serialization format. Do not use Float for currency, exact decimal identifiers or values requiring preserved database DECIMAL scale. Null and provider conversion/overflow behavior remain independent.

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

Created 2026-07-15