TLongintField class
Field class for 32-bit signed integer data.
Declaration
TLongintField = class(TNumericField)Inheritance
- TLongintField
- TNumericField
- TField
- TComponent
- TPersistent
- TObject
Descends from it: TAutoIncField TByteField TIntegerField TShortintField TSmallintField TWordField
Description
TLongintField is instantiated when a dataset must manage a field with 32-bit signed data:
the data type
ftInteger. It overrides some methods of
TField to handle integer
data, and sets some of the properties to values for integer data. It also introduces some methods and
properties specific to integer data such as
MinValue and
MaxValue.
It should never be necessary to create an instance of TLongintField manually, a field
of this class will be instantiated automatically for each integer field when a dataset is opened.
See also
Properties
Value | public | Value of the field as longint. |
MaxValue | published | Maximum value for the field. |
MinValue | published | Minimum value for the field. |
Methods
GetAsFloat | protected | |
GetAsInteger | protected | |
GetAsLongWord | protected | |
GetAsString | protected | |
GetAsVariant | protected | |
GetDataSize | protected | |
GetText | protected | |
GetValue | protected | |
SetAsFloat | protected | |
SetAsInteger | protected | |
SetAsLongWord | protected | |
SetAsString | protected | |
SetVarValue | protected | |
GetAsLargeInt | protected | |
SetAsLargeInt | protected | |
Create | public | Create a new instance of TLongintField. |
CheckRange | public | Check whether a valid 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 (127)
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 GetAsBCD 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 SetAsBCD 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
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.