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if Qry.RecordCount = 0 then
  ShowMessage('ûÓÐÕÒµ½¼Ç¼');

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try
...
except
...
finally


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try
 if qy.IsEmpty then showmessage('ûÓÐÕÒµ½¼Ç¼£¡')£»
except
  on E:Exception do
  ShowMessage(E.Message);
end;

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begin
if cus_name.Text=''
then showmessage('ÇëÊäÈëÒª²éѯµÄ¿Í»§ÐÕÃû')
else
with adoquery1 do
begin
close;
sql.Clear;
sql.Add('select * from Ô¤¶©¿Í»§²éѯ±í where ¿Í»§ÐÕÃû=:name');
Parameters.ParamByName('name').Value:= Trim(cus_name.text);
open;
try
if adoquery1.RecordCount = 0 then
  ShowMessage('ûÓÐÕÒµ½¼Ç¼');
except
 while not eof do
 begin
  cus_time.Text:=adoquery1.Fieldbyname('Èëסʱ¼ä').AsString;
  cus_rnum.Text:=adoquery1.Fieldbyname('·¿¼äºÅ').AsString;
  Next;


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