Delphi在程序中“拼SQL语句”获取结果

执行范例：
 1 var
 2   Qry:TAdoQuery;
 3   singleRecord,Response:string;
 4 begin
 5    Context.Response:='获取合约列表返回数据！';
 6    Qry:=TAdoQuery.Create(nil);
 7    try
 8      try
 9        Qry.Connection:=Context.Cn;
10        Qry.Close;
11        Qry.SQL.Clear;
12        Qry.SQL.Add('select * from wmnow..code');
13        Qry.Open;
14        while not Qry.Eof do
15        begin
16          singleRecord:=Qry.FieldByName('i_unit').AsString+';'+Qry.FieldByName('v_unit').AsString+';'
17                             +Qry.FieldByName('i_dot').AsString;
18          Response:=Response+singleRecord+'|';
19          Qry.Next;
20        end;
21        SetLength(Response,Length(Response)-1);
22      except
23        on   E:Exception   do
24        begin
25           MainForm.MemoPrint('数据库连接失败,请检查连接');
26        end;
27      end
28    finally
29       Qry.Free;
30    end;
31    Context.Response:=Response;
32 end;