| [Overview][Constants][Types][Classes][Procedures and functions][Index] |
[Properties (by Name)] [Methods (by Name)] [Events (by Name)]
Field class for 64-bit signed integer data
Source position: db.pas line 555
type TLargeintField = class(TNumericField) |
||
protected |
||
function GetAsFloat; override; |
||
function GetAsLongint; override; |
||
function GetAsLargeint; override; |
||
function GetAsString; override; |
||
function GetAsVariant; override; |
||
function GetDataSize; override; |
||
procedure GetText(); override; |
||
function GetValue(); |
||
procedure SetAsFloat(); override; |
||
procedure SetAsLongint(); override; |
||
procedure SetAsLargeint(); override; |
||
procedure SetAsString(); override; |
||
procedure SetVarValue(); override; |
||
public |
||
constructor Create(); override; |
|
Create a new instance of the TLargeintField class |
function CheckRange(); |
|
Check whether a values falls within the allowed range |
|
Field contents as a 64-bit integer value |
|
published |
||
|
Maximum value for the field |
|
|
Minimum value for the field |
|
end; |
|
Field class for 64-bit signed integer data |
|
| | | ||
|
Base class for all numerical data field classe |
|
| | | ||
|
Provide access to the contents of a single field in a record |
|
| | | ||
| | | ||
| | | ||
TLargeIntField is instantiated when a dataset must manage a field with 64-bit signed data: the data type ftLargeInt. It overrides some methods of TField to handle int64 data, and sets some of the properties to values for int64 data. It also introduces some methods and properties specific to 64-bit integer data such as MinValue and MaxValue.
It should never be necessary to create an instance of TLargeIntField manually, a field of this class will be instantiated automatically for each int64 field when a dataset is opened.
|
Provide access to the contents of a single field in a record |
|
|
Minimum value for the field |
|
MaxValue |
| lazarus-ccr.sourceforge.net |