try-catch

问题 I want to throw a custom exception which is the data validation exception in a controller of my CakePHP application. How do I create my own custom exception handler in Cakephp so that I can throw the exception and catch the exception? My code example: function getUserDetails($userid){ try{ if(!$validUser){ throw new Exception('Invalid User'); } return $userDetailsData; //returned from db }catch(Exception $e){ echo 'Error:'.$e->getMessage(); return; } } is it possible to use here custom

问题 I know it is common to use catch when executing commands that may return non-zero... but how can I get the output in that case? To be specific, I wish to do something like "catch {exec diff fileA fileB} ret". The files are different and ret value is 1. What I actaully need is the output of diff, the detailed differences. But I believe the "catch {exec ...} err" practice does not provide it, right? Can someone please suggest on this task? Is there tcl-builtin commands to do file diff? (I think

问题 I'd like to avoid writting errorCount += 1 in more than one place. I'm looking for a better way than success = False try: ... else: success = True finally: if success: storage.store.commit() else: storage.store.rollback() I'm trying to avoid store.rollback() in every except clause. Any idea on how to do this? count = 0 successCount = 0 errorCount = 0 for row in rows: success = False count += 1 newOrder = storage.RepeatedOrder() storage.store.add(newOrder) try: try: newOrder.customer =

问题 When I run the code below for the GetWindowText I get the following error thrown as an inner Exception: {"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."} [DllImport("user32.dll", EntryPoint = "GetWindowTextLength", SetLastError = true)] internal static extern int GetWindowTextLength(IntPtr hwnd); [DllImport("user32.dll", EntryPoint = "GetWindowText", SetLastError = true)] internal static extern int GetWindowText(IntPtr hwnd, ref

问题 I have a file called functions.php . This file consists includes to all the other function files, for example: include_once("user_functions.php"); include_once("foo_functions.php"); I would like to catch errors where when I screw a code in one of those files, It wouldn't give the error to the entire system. For example, if there is a parser error in foo_functions.php it will just not include it in functions.php . Is that possible? 回答1: Parser errors are fatal errors, so you can't catch them.

问题 I have a file called functions.php . This file consists includes to all the other function files, for example: include_once("user_functions.php"); include_once("foo_functions.php"); I would like to catch errors where when I screw a code in one of those files, It wouldn't give the error to the entire system. For example, if there is a parser error in foo_functions.php it will just not include it in functions.php . Is that possible? 回答1: Parser errors are fatal errors, so you can't catch them.

问题 I am trying to find out the best way of handling exceptions, I have a number of layers to my application and started to use a return type of BOOL i.e. if it fails then return False and if it succeeds return True.. This works great in methods like SaveMyRecord(somerecord); as i am passing in values and don't require anything returned so i can use the return type of bool to indicate if it succeeds or not. But then it got me thinking that things like GetMyRecord() actually returns type of

问题 I am trying to find out the best way of handling exceptions, I have a number of layers to my application and started to use a return type of BOOL i.e. if it fails then return False and if it succeeds return True.. This works great in methods like SaveMyRecord(somerecord); as i am passing in values and don't require anything returned so i can use the return type of bool to indicate if it succeeds or not. But then it got me thinking that things like GetMyRecord() actually returns type of

问题 I have this try and catch problem. I am trying to redirect to a different page. But sometimes it does and some times it doesnt. I think the problem is in try and catch . can someone help me understand this. Thanks var pg = new Object(); var da = document.all; var wo = window.opener; pg.changeHideReasonID = function(){ if(pg.hideReasonID.value == 0 && pg.hideReasonID.selectedIndex > 0){ pg.otherReason.style.backgroundColor = "ffffff"; pg.otherReason.disabled = 0; pg.otherReason.focus(); } else

问题 I run a simple flask app like this: from flask import Flask app = Flask(__name__) @app.route('/') def welcome(): return "OK" app.config.update( DEBUG = True ) if __name__ == '__main__': app.run(use_reloader = False) when I run it and visit it, sometimes(not always) it could't response the request and throw an except: Exception happened during processing of request from ('127.0.0.1', 54481) Traceback (most recent call last): File "c:\python27\Lib\SocketServer.py", line 295, in _handle_request