TIntegerField Class

TIntegerField represents a signed 32-bit integer field in a dataset.

Pascal

TIntegerField = class(TNumericField);

C++

class TIntegerField : public TNumericField;

File

Description

TIntegerField encapsulates the fundamental behavior common to fields that contain integer data. Integer fields can hold values in the range -2,147,483,648 to 2,147,483,647, and are frequently used to hold values that are large, signed whole numbers. In addition to the properties, methods, and events common to all fields that are introduced by the TField class, TIntegerField introduces new properties to convert between integer values and other data types, and to limit the range of valid integers that the field will permit.

If you use the Fields editor at design time to create a persistent field component for the integer field, you can access it by name at runtime. When using dynamic field components, you can access the TIntegerField instance using the dataset's Fields property or FieldByName method.

TIntegerField is the direct ancestor of three other field types that represent whole numbers: TAutoIncField, TSmallIntField, and TWordField.

Delphi Examples:

Copy Code

{
This example requires two ClientDataSets, two DBGrids, two
DataSources and two DBNavigators.  Name the two
ClientDataSets CDS and CDS2. Set the DataSet property in the
first DataSource to CDS and name that DataSource DS.  Set the
DataSet property in the second DataSource to CDS2 and name
that DataSource DS2.  Set the DataSource in the first
DBNavigator to DS and the DataSource in the second DBNavigator
to DS2.  Set the DataSource in the first DBGrid to DS and the
DataSource in the second DBGrid to DS2.  Right click on CDS
and select the Fields Editor, then right click on the Field
Editor form and create two fields by selecting "new field".
In the field configuration window, set the name to HOST, the
Component value will automatically be set to CDSHOST.  Set
the filed type to String.  In the field configuration window
for the second field, set the name to PORTA, the Component
value will automatically be set to CDSPORTA.  Set the field
type to Integer.  The file used to load CDS must have an
attribute name of HOST with an attribute type of string and
an attribute name of PORTA with an attribute type of integer.
Add DB, DBCtrls, Grids, DBGrids, DBClient and SwSystem to the
uses clause.  "LoadFormFile" to start with the file, or 
"CreateDataSet" to start from scratch.  You must "CloseDataSet"
after a "LoadFromFile" before you can do another "CreateDataSet".
}
{$IFNDEF UNICODE}
uses SwSystem;
{$ENDIF}

procedure TForm1.Button1Click(Sender: TObject);
begin
{$IFDEF UNICODE}
  CDS.LoadFromFile(GetCurrentDir + '\CDS.XML');
{$ELSE}
  CDS.LoadFromFile(gsAppPath + 'CDS.XML');
{$ENDIF}
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
{$IFDEF UNICODE}
  CDS.SaveToFile(GetCurrentDir + '\CDS.XML', dfXML);
{$ELSE}
  CDS.SaveToFile(gsAppPath + 'CDS.XML', dfXML);
{$ENDIF}
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  CDS.CreateDataSet;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  CDS2.Data := CDS.Data;
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  CDS.Close;
end;