TStringField class

Declaration

Inheritance

1. TStringField
2. TField
3. TComponent
4. TPersistent
5. TObject

Descends from it: TGuidField TWideStringField

Description

TStringField is the class used whenever a dataset has to handle a string field type (data type ftString). This class overrides some of the standard TField methods to handle string data, and introduces some properties that are only pertinent for data fields of string type. It should never be necessary to create an instance of TStringField manually, a field of this class will be instantiated automatically for each string field when a dataset is opened.

See also

• TField
• TWideStringField
• TDataset

Properties

CodePage	public	Codepage of the field string data.
FixedChar	public	Is the string declared with a fixed length ?
Transliterate	public	Should the field value be transliterated when reading or writing.
Value	public	Value of the field as a string.
EditMask	published	Specify an edit mask for an edit control.
Size	published	Maximum size of the string.

Methods

CheckTypeSize	protected
GetAsBoolean	protected
GetAsDateTime	protected
GetAsFloat	protected
GetAsInteger	protected
GetAsLargeInt	protected
GetAsLongWord	protected
GetAsString	protected
GetAsAnsiString	protected
GetAsUTF8String	protected
GetAsVariant	protected
GetDataSize	protected
GetDefaultWidth	protected
GetText	protected
GetValue	protected
SetAsBoolean	protected
SetAsDateTime	protected
SetAsFloat	protected
SetAsInteger	protected
SetAsLargeInt	protected
SetAsLongWord	protected
SetAsString	protected
SetAsAnsiString	protected
SetAsUTF8String	protected
SetVarValue	protected
SetValue	protected
Create	public	Create a new instance of the TStringField class.
SetFieldType	public	Set the field type.

Inherited

From TField (118)

AccessError Alignment AsAnsiString AsBCD AsBoolean AsBytes AsCurrency AsDateTime AsExtended AsFloat AsInteger AsLargeInt AsLongint AsLongWord Assign AssignValue AsSingle AsString AsUnicodeString AsUTF8String AsVariant AsWideString AttributeSet Bind Calculated CanModify Change CheckInactive Clear ConstraintErrorMessage CurValue CustomConstraint DataChanged DataSet DataSize DataType DefaultExpression Destroy DisplayLabel DisplayName DisplayText DisplayWidth EditMaskPtr FieldDef FieldKind FieldName FieldNo FocusControl FreeBuffers GetAsBCD GetAsBytes GetAsCurrency GetAsExtended GetAsLongint GetAsSingle GetAsUnicodeString GetAsWideString GetCanModify GetClassDesc GetCurValue GetData GetDisplayName GetIsNull GetNewValue GetOldValue GetParentComponent HasConstraints HasParent ImportedConstraint Index IsBlob IsIndexField IsNull IsValidChar KeyFields Lookup LookupCache LookupDataSet LookupKeyFields LookupList LookupResultField NewValue Notification Offset OldValue OnChange OnGetText OnSetText OnValidate Origin ParentField PropertyChanged ProviderFlags ReadOnly ReadState RefreshLookupList Required SetAsBCD SetAsBytes SetAsCurrency SetAsExtended SetAsLongint SetAsSingle SetAsUnicodeString SetAsVariant SetAsWideString SetData SetDataset SetDataType SetNewValue SetParentComponent SetParentField SetSize SetText Text Validate ValidChars Visible

From TComponent (69)

_AddRef _Release BeforeDestruction CanObserve ChangeName ComObject ComponentCount ComponentIndex Components ComponentState ComponentStyle DefineProperties DesignInfo DestroyComponents Destroying ExecuteAction FindComponent FreeNotification FreeOnRelease GetChildOwner GetChildParent GetChildren GetDeltaStreams GetEnumerator GetIDsOfNames GetNamePath GetObservers GetOwner GetTypeInfo GetTypeInfoCount iicrGetComponent InsertComponent Invoke IsImplementorOf Loaded Loading Name ObserverAdded Observers OnGetDeltaStreams Owner PaletteCreated QueryInterface ReadDeltaState ReadDeltaStream ReferenceInterface RemoveComponent RemoveFreeNotification RemoveFreeNotifications SafeCallException SetAncestor SetChildOrder SetDesigning SetDesignInstance SetInline SetName SetSubComponent Tag ToString TToStringNameMode UpdateAction Updated UpdateRegistry Updating ValidateContainer ValidateInsert ValidateRename VCLComObject WriteState

From TPersistent (4)

AssignTo FPOAttachObserver FPODetachObserver FPONotifyObservers

From TObject (37)

AfterConstruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName StringMessageTable SystemHasExtendedRTTI UnitName