(Fam > 'K') and (Fam < '') ORDER BY Name, Fam
, .
SQL .
SQL (. 17.18), SQL Object Inspector.
. 18. ""
SQL . , , Add, (SQL-) SQL.
, ( Fam fam).
Withforml.Queryl do begin
Close; //
//
SQL.Clear; //
// SQL
SQL.Add('SELECT Fam, Name, Class1);
SQL.Add('FROM "::school.db"');
SQL.Add('WHERE');
SQL.Add('(Fam = '" + fam + '")');
SQL.Add('ORDER BY Name, Fam');
Open; //
end;
, 2, . 19, , , , . , . , .
DBGrid1, DataSourcel 䳺 Table1 ( ) Query ( ).
. 19.
˳ 2. ""
unit school2_;
interface
uses
Windows, Messages, SysUtils, Classes
Graphics, Controls, Forms
Dialogs,Grids, DBGrids, Db
DBTables, ExtCtrls, DBCtrls, StdCtrls;
type
TForm1 = class(TForm)
Table1: TTable; // ( )
Query1: TQuery; // ( , )
DataSource1: TDataSource; // -
DBGrid1: TDBGrid; //
DBNavigator1: TDBNavigator;
DBText1: TDBText;
Button1: TButton; //
Button2: TButton; //
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormActivate(Sender: TObject);
private
Private declarations } public
Public declarations } end;
var
Form1: TForm1;
implementation
{$R *.DFM}
//
procedure TForm1.Button1Click(Sender: TObject);
var
fam: string[30];
begin
fam:=InputBox(' ',
' OK.', '');
if fam <> '' //
then
begin
with form1.Query1 do begin
Close; // -
SQL.Clear; //
// SQL
SQL.Add('SELECT Fam, Name, Class');
SQL.Add('FROM "::school.db"');
SQL.Add('WHERE');
SQL.Add('(Fam = "'+ fam + '")');
SQL.Add('ORDER BY Name, Fam');
Open; //
end;
|
|
|
{ ***
begin
Query1.Close;
Query1.SQL[3]:='(Fam="'+ fam + '")';
Query1.Open;
DataSource1.DataSet:=Query1;
end;
if Query1.RecordCount <> 0 then
DataSource1.DataSet:=Query1 // -
else begin
ShowMessage(' , .');
DataSource1.DataSet:=Table1;
end;
end;
end;
//
procedure TForm1.Button2Click(Sender: TObject);
begin
DataSource1.DataSet:=Table1; // -
end;
//
procedure TForm1.FormActivate(Sender: TObject);
begin
DataSource1.DataSet:= Table1;
Table1.Active:= True;
end;
End.
TForm1.Button1Click . () () SQL . Open .
, SQL- close ( , (), ).
TForm1.Button2Click, , DataSourcel Table1, .
SQL , .
,
