TFloatField class
Class for floating point values.
Declaration
TFloatField = class(TNumericField)Inheritance
Descends from it: TCurrencyField
Description
TFloatField is the class created when a dataset must manage floating point values of double precision.
It exposes a few new properties such as
Currency,
MaxValue,
MinValue and overrides some
TField methods to work with floating point data.
It should never be necessary to create an instance of TFloatField manually, a field
of this class will be instantiated automatically for each floating-point field when a dataset is opened.
See also
Properties
Value | public | Value of the field as a double type. |
Currency | published | Is the field a currency field. |
MaxValue | published | Maximum value for the field. |
MinValue | published | Minimum value for the field. |
Precision | published | Precision (number of digits) of the field in text representations. |
Methods
GetAsBCD | protected | |
GetAsFloat | protected | |
GetAsLargeInt | protected | |
GetAsLongWord | protected | |
GetAsInteger | protected | |
GetAsString | protected | |
GetAsVariant | protected | |
GetDataSize | protected | |
GetText | protected | |
SetAsBCD | protected | |
SetAsFloat | protected | |
SetAsLargeInt | protected | |
SetAsLongWord | protected | |
SetAsInteger | protected | |
SetAsString | protected | |
SetVarValue | protected | |
Create | public | Create a new instance of the TFloatField. |
CheckRange | public | Check whether a value is in the allowed range of values for the field. |
Inherited
From TNumericField (9)
Alignment CheckTypeSize DisplayFormat EditFormat GetAsBoolean RangeError SetAsBoolean SetDisplayFormat SetEditFormat
From TField (125)
AccessError 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 EditMask EditMaskPtr FieldDef FieldKind FieldName FieldNo FocusControl FreeBuffers GetAsAnsiString GetAsBytes GetAsCurrency GetAsDateTime GetAsExtended GetAsLongint 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 SetAsBytes SetAsCurrency SetAsDateTime SetAsExtended SetAsLongint 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
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