| [Overview][Constants][Types][Classes][Procedures and functions][Index] |
[Properties (by Name)] [Methods (by Name)] [Events (by Name)]
Field class for native variant data
Source position: db.pas line 868
type TVariantField = class(TField) |
||
class procedure CheckTypeSize(); override; |
||
protected |
||
function GetAsBoolean; override; |
||
procedure SetAsBoolean(); override; |
||
function GetAsDateTime; override; |
||
procedure SetAsDateTime(); override; |
||
function GetAsFloat; override; |
||
procedure SetAsFloat(); override; |
||
function GetAsInteger; override; |
||
procedure SetAsInteger(); override; |
||
function GetAsString; override; |
||
procedure SetAsString(); override; |
||
function GetAsWideString; override; |
||
procedure SetAsWideString(); override; |
||
function GetAsVariant; override; |
||
procedure SetVarValue(); override; |
||
function GetDefaultWidth; override; |
||
public |
||
constructor Create(); override; |
|
Create a new instance of the TVariantField class |
end; |
|
Field class for native variant data |
|
| | | ||
|
Provide access to the contents of a single field in a record |
|
| | | ||
| | | ||
| | | ||
TVariantField is the class used when a dataset must manage native variant-typed data. (TField.DataType equals ftVariant). It initializes some of the properties of the TField class and overrides some of its methods to be able to work with variant data.
It should never be necessary to create an instance of TVariantField manually, a field of this class will be instantiated automatically for each variant field when a dataset is opened.
|
Base class for records-based data-access |
|
|
Provide access to the contents of a single field in a record |
| lazarus-ccr.sourceforge.net |