try-catch | 易学教程

Try Catch in SQL Server 2000?

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问题 Is it possible using Try-Catch in SQL Server 2000 ? 回答1: No, it is not possible. This was only from Sql Server 2005 Check TRY...CATCH (Transact-SQL) and check the Other Versions 回答2: No. Try Catch block was introduced in SQL SERVER 2005 . Following article shows how you can use @@ERROR to check for errors. Understanding error handling in SQL Server 2000 回答3: Instead you can user @@Error .. check this article about error handling 回答4: @@ERROR is a variable updated by the SQL Server database

ruby catch-throw and efficiency

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问题 catch in Ruby is meant to jump out of deeply nested code. In Java e.g. it is possible to achieve the same with Java's try-catch meant for handling exceptions, it is however considered poor solution and is also very inefficient. In Ruby for handling exceptions we have begin-raise-rescue and I assume it is also to expensive to use it for other tasks. Is Ruby's catch-throw really a more efficient solution then begin-raise-rescue or are there any other reasons to use it to break nested blocks

When catching a general exception, how can I determine the original exception type?

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问题 When catching an exception in .NET, you can have as many type-specific exception blocks as needed. But I usually try to have at least one "general" exception catch block. But is there a way to get the type of the "real" exception thrown that is caught by the generic exception handler, perhaps using reflection? For example, if I have Catch ex As System.ServiceModel.FaultException(Of InvalidUser) ProcessModuleLoadException(Me, ex) Catch ex As System.ServiceModel.FaultException(Of SQLExceptions)

Catching a SoapException thrown by a WebService

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问题 I wrote the following service : namespace WebService1 { [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] public class Service1 : System.Web.Services.WebService { [WebMethod] public string Test(string str) { if (string.IsNullOrEmpty(str)) throw new SoapException("message", SoapException.ClientFaultCode); else return str; } } } And a basic application to test it (one button calling the Test

Rethrow php exception into higher level catch block

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问题 I am trying to pass an exception from a specific catch block to a more general catch block. However it does not appear to be working. I get a 500 server error when I try the following. Is this even possible? I realize that there are easy workarounds, but isn't it normal to say, "Hey I don't feel like dealing with this error, let's have the more general exception handler take care of it!" try { //some soap stuff } catch (SoapFault $sf) { throw new Exception('Soap Fault'); } catch (Exception $e

Java using scanner with try-with-resources

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I have two versions of Java code that gets user input until user types "q" Version 1: public class Test { public static void main(String[] args) { String input = ""; while (!input.equals("q")) { Scanner scanner = new Scanner(System.in); System.out.print("Input: "); input = scanner.nextLine(); System.out.println("Input was: " + input); } } } Version 2: public class Test { public static void main(String[] args) { String input = ""; while (!input.equals("q")) { try(Scanner scanner = new Scanner(System.in)){ System.out.print("Input: "); input = scanner.nextLine(); System.out.println("Input was: "

should I wrap all my WCF service code in a try catch block?

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问题 try { ///// here is the code that might throw erros. If I discover the user is unauthorized I throw a WebFaultException myself to alert the client } catch (WebFaultException ex) { throw ex; //but if I wrap all code in try-catch, I have to rethrow the exception o the status code reaches the client } catch (Exception ex) { throw new WebFaultException(ex.Message, HttpStatusCode.InternalServerError); } Should I wrap all in a try-catch, or what do you recommend? I use WCF with rest-ful JSON

try-catch every db connection?

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问题 Is it recommended to put a try-catch block in every function that opens a DB connection and log the error there, or should I rather catch errors in a higher layer of the application? public static Category GetCategoryByName(string name) { Category result; try { using (IDbConnection conn = ConnectionHelper.CreateDbConnectionByName(_connectionStringName)) { conn.Open(); using (IDbCommand cmd = conn.CreateCommand()) { //do stuff } } } catch(Exception e) { // log error here? } return result; } or

Is try catch in a view bad practice? [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed last year . In an MVC3 application, is it considered bad practice to use a try catch block inside of a razor block @{ } in the .cshtml view? 回答1: Very much so. Views should not contain any real logic; anything that might throw an exception belongs in the controller. 回答2: @{ try { <td> @(

TRY doesn't CATCH error in BULK INSERT

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Why in the following code TRY didn't catch the error and how can I catch this error? BEGIN TRY BULK INSERT [dbo].[tblABC] FROM 'C:\temp.txt' WITH (DATAFILETYPE = 'widechar',FIELDTERMINATOR = ';',ROWTERMINATOR = '\n') END TRY BEGIN CATCH select error_message() END CATCH I just get this: Msg 4860, Level 16, State 1, Line 2 Cannot bulk load. The file "C:\temp.txt" does not exist. This is one option that helps to catch this error: BEGIN TRY DECLARE @cmd varchar(1000) SET @cmd = 'BULK INSERT [dbo].[tblABC] FROM ''C:\temp.txt'' WITH (DATAFILETYPE = ''widechar'',FIELDTERMINATOR = '';'',ROWTERMINATOR