TDateTimeField class
Field class for date/time/Datetime values.
Declaration
TDateTimeField = class(TField)Inheritance
- TDateTimeField
- TField
- TComponent
- TPersistent
- TObject
Descends from it: TDateField TTimeField
Description
TDateTimeField is the class used when a dataset must manage data of type datetime. (
DataType equals
ftDateTime).
It also serves as base class for the
TDateField or
TTimeField classes. It overrides some of the properties and methods of the
TField class to be able to work with date/time fields.
It should never be necessary to create an instance of TDateTimeField manually, a field
of this class will be instantiated automatically for each datetime field when a dataset is opened.
See also
Properties
Value | public | Contents of the field as a TDateTime value. |
DisplayFormat | published | Formatting string for textual representation of the field. |
EditMask | published | Specify an edit mask for an edit control. |
Methods
GetAsDateTime | protected | |
GetAsFloat | protected | |
GetAsString | protected | |
GetAsVariant | protected | |
GetDataSize | protected | |
GetText | protected | |
SetAsDateTime | protected | |
SetAsFloat | protected | |
SetAsString | protected | |
SetVarValue | protected | |
Create | public | Create a new instance of a TDateTimeField class. |
Inherited
From TField (134)
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 CheckTypeSize Clear ConstraintErrorMessage CurValue CustomConstraint DataChanged DataSet DataSize DataType DefaultExpression Destroy DisplayLabel DisplayName DisplayText DisplayWidth EditMaskPtr FieldDef FieldKind FieldName FieldNo FocusControl FreeBuffers GetAsAnsiString GetAsBCD GetAsBoolean GetAsBytes GetAsCurrency GetAsExtended GetAsInteger GetAsLargeInt GetAsLongint GetAsLongWord GetAsSingle GetAsUnicodeString GetAsUTF8String GetAsWideString GetCanModify GetClassDesc GetCurValue GetData GetDefaultWidth 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 SetAsAnsiString SetAsBCD SetAsBoolean SetAsBytes SetAsCurrency SetAsExtended SetAsInteger SetAsLargeInt SetAsLongint SetAsLongWord SetAsSingle SetAsUnicodeString SetAsUTF8String SetAsVariant SetAsWideString SetData SetDataset SetDataType SetFieldType SetNewValue SetParentComponent SetParentField SetSize SetText Size 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
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.