Delphi中的Prepare
1)
with qryGetId do
begin
close;
ParamByName('Id').asstring:=vDefUseId;
if not Prepared then Prepare;
open;
end;
2)
with qryGetId do
begin
close;
ParamByName('Id').asstring:=vDefUseId;
open;
end;
请问 if not Prepared then Prepare; 这句话写与不写有什么差异?结果好像都一样