ftGuid

ftGuid = 35

Example

function IsGuidField(Field: TField): Boolean;
begin
  Result := Field.DataType = ftGuid;
end;

Usage

ftGuid identifies GUID metadata represented by Velox's specialised string field and convertible to a TGUID value.

Additional Technical Info

ftGuid is ordinal 35 of TFieldType. Delphi maps it to TGuidField, a TStringField descendant, and treats it as base string metadata during field compatibility.

The logical value is a 128-bit GUID, but the provider can store text or native binary. Do not assume braces, hyphen case, byte order or field length from the enum. Parse to a GUID for validation/comparison and emit the exact destination format; string comparison can be affected by formatting rather than identity.

Null is distinct from the all-zero GUID and from empty/invalid text. Conversion can raise on malformed values. Avoid generating identifiers by string manipulation; use the approved GUID functions.

The example only inspects metadata and was source-reviewed; no GUID parsing, dataset, database, runtime or image test ran.

External references

• Embarcadero TFieldType, TGuidField and TGUID.
• Free Pascal TFieldType compatibility reference.

Created 2026-07-15