在delphi 7中,是`try …除了raise;结束;“有意义吗？

with ADOQuery1 do begin
  // .. fill out sql.text,etc
  try
    execSQL;
  except
    raise;
  end;
end;

在这种情况下,raise操作没有效果,应该删除,因为它只是重新引发异常块刚刚捕获的异常. raise通常用于在没有适当的错误处理时将控制转移到块的末尾.在下面我们处理自定义异常,但任何其他异常应该在别处处理.

try
  someOperation;
except
  on e: ECustomException do
    someCustomHandelr;
  else
     begin
       // the raise is only useful to rethrow the exception to an encompasing 
       // handler.  In this case after I have called my logger code. as Rob
       // mentioned this can be omitted if you arent handling anything because
       // the compiler will simply jump you to the next block if there is no
       // else.
       LogUnexpectedException('some operation failed',E);
       raise;
     end;
end;

小心有没有“加注”的类似外观形式,它具有吃/隐藏任何例外的副作用.非常肆无忌惮的开发人员的实践,他们希望能够在竞争中占据一席之地.

with ADOQuery1 do begin  
  // .. fill out sql.text,etc  
  try    
    execSQL; 
  except
    // no handler so this just eats any "errors"    
  end;